5. George walks to a friend's house. He walks 750 meters North, then realizes he walked too far.
turns around and walks 250 meters South. The entire walk takes him 13 seconds. What is his speed
per second?
1000m S=76.92m/s
5=735
d=1000m
₁7=135
5=22
S=76.92m/s
what was George's velocity in meters per second? (hint: draw a picture to find his
displacement)
DPERC
quests. 4719
12
Answers
Answer:
Average speed: approximately \(76.9\; {\rm m\cdot s^{-1}}\).
Average velocity: approximately \(38.5\; {\rm m \cdot s^{-1}}\) (to the north.)
Explanation:
Consider an object that travelled along a certain path. Distance travelled would be equal to the length of the entire path.
In contrast, the magnitude of displacement is equal to distance between where the object started and where it stopped.
In this question, the path George took required him to travel \(750\; {\rm m} + 250\; {\rm m} = 1000\; {\rm m}\) in total. Hence, the distance George travelled would be \(1000\; {\rm m}\). However, since George stopped at a point \((750\; {\rm m} - 250\; {\rm m}) = 500\; {\rm m}\) to the north of where he started, his displacement would be only \(500\; {\rm m}\) to the north.
Divide total distance by total time to find the average speed.
Divide total displacement by total time to find average velocity.
The total time of travel in this question is \(13\; {\rm s}\).. Therefore:
\(\begin{aligned}\text{average speed} &= \frac{\text{total distance}}{\text{total time}} \\ &= \frac{1000\; {\rm m}}{13\; {\rm s}} \\ &\approx 76.9\; {\rm m\cdot s^{-1}}\end{aligned}\).
\(\begin{aligned}\text{average velocity} &= \frac{\text{total displacement}}{\text{total time}} \\ &= \frac{500\; {\rm m}}{13\; {\rm s}} && \genfrac{}{}{0px}{}{(\text{to the north})}{}\\ &\approx 38.5\; {\rm m\cdot s^{-1}} && (\text{to the north})\end{aligned}\).
Related Questions
What is the change in temperature for the water in the calorimeter after the aluminum wire was added?
C
What is the change in temperature for the water in the calorimeter after the steel wire was added?
C
What is the change in temperature for the water in the calorimeter after the lead pellets were added?
C
Answers
The specific heat of Al is greater than that of water. Therefore, adding Al wire will increase the temperature of water in the calorimeter. While adding the Pb pellets will decrease the temperature.
What is calorimetry ?Calorimetry is an analytical technique used to determine the heat energy absorbed or released by a system. The calorimetric equation connecting the heat change q with mass of the substance m, specific heat capacity c and the temperature difference ΔT is:
q = m c ΔT
The specific heat of a substance is the heat energy required to increase the temperature by one degree Celsius per one gram. Higher the specific heat, higher be the rate of cooling or heating.
The heat gained by water from steel will be greater than that of Al because specific heat of steel is greater. Lead has very small specific heat and the temperature change will be smaller.
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Answer:
aluminum wire = 2.6c
steel wire = 1.5c
lead pellets = 0.8c
Explanation:
(a) what is the wavelength of a 1.00-ev photon? (b) find its frequency in hertz. (c) identify the type of em radiation.
Answers
(a) The wavelength of a 1.00 eV photon is approximately 7.76 x 10^-7 meters.
(b) The frequency of the photon is approximately 3.86 x 10^14 Hz.
(c) The type of electromagnetic radiation corresponding to a 1.00 eV photon is within the visible light spectrum, specifically in the red part of the spectrum.
(a) To calculate the wavelength of a 1.00 eV photon, we use the equation λ = hc/E, where λ represents the wavelength, h is the Planck's constant, c is the speed of light, and E is the energy of the photon. By substituting the given values and converting eV to joules, we find that the wavelength is approximately 7.76 x 10^-7 meters.
(b) The frequency of the photon can be determined using the equation f = c/λ, where c is the speed of light and λ is the wavelength. By substituting the known values, we calculate the frequency to be approximately 3.86 x 10^14 Hz.
(c) Based on the obtained wavelength and frequency, we can identify the type of electromagnetic radiation. A 1.00 eV photon falls within the visible light spectrum. Specifically, it is in the red part of the spectrum, which has longer wavelengths and lower frequencies compared to higher-energy photons such as those in the ultraviolet or X-ray range.
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What would it take to get the stone slab to move? Propose an
idea and explain how it would work in the context of Newton's
laws.
Answers
In order to get a stone slab to move, one would have to apply force to it. This can be done in a number of ways, depending on the situation. Here are a few possible laws that could be proposed for moving a stone slab:1. Newton's first law of motion: This law states that an object at rest will stay at rest unless acted upon by an external force. Therefore, to move a stone slab, one would need to apply a force to it.
This could be done by pushing it, pulling it, or applying a force from a lever or other mechanical device. Newton's second law of motion: This law states that the force required to accelerate an object is directly proportional to its mass. Therefore, to move a stone slab, a greater force would be required if it is more massive. This could be accomplished by using more people to push or pull the slab, or by using a larger lever or other mechanical device.. Friction: Friction is the force that opposes motion between two surfaces that are in contact with each other. In order to move a stone slab, one would need to overcome the friction between it and the surface it is resting on. This could be accomplished by reducing the friction (for example, by using rollers or lubricant), or by applying a greater force to overcome the friction.Work: Work is defined as the product of force and distance. Therefore, in order to move a stone slab, one would need to apply a force over a certain distance.This could be accomplished by pushing or pulling the slab over a distance, or by using a lever or other mechanical device to apply force over a greater distance.These are just a few possible laws that could be proposed for moving a stone slab. Ultimately, the best approach will depend on the specific situation and the resources available.For such more question on Newton's second law
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A block is initially sliding along a surface of negligible friction with a speed v0 A constant force F0 is then exerted on the block. Which of the following figures represents the situations in which the kinetic energy of the block will initially decrease? Select two answers.
Answers
The frictional force reduces the block's kinetic energy and causes negative work to be done on it.
Simply put, what is kinetic energy?Kinetic energy is the energy that a thing has when it is moving. An item can only be accelerated through the application of a force. Applying force requires effort on our part. Following completion of the work, energy is transferred towards the object, which then moves at such a new, constant speed.
What kinds of things contain kinetic energy?
Kinetic energy appears to be the driving force behind motion, as evidenced by the way objects and subatomic particles move. Every particle & moving object contains kinetic energy. Examples of kinetic energy in motion include walking, a baseball flying through the air, food falling off a table, and just a charged particle within an electric field.
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i have a few questions
multipe choice
8) Kinetic energy is the energy of ________.
9)The potential energy of an object depends on its ________ and its height.
10) The law of ________ of energy states that energy can be neither created nor destroyed, but it can change its form.
11) Stored energy is called ________ energy.
12) When you move your hand or foot, your body has converted potential energy into ________ energy.
13) When coasting while roller skating, you eventually stop due to ________.
please and thank you
Answers
Energy refers to the ability or capacity to do work. Energy can be of various types as follows:
Mechanical energy (kinetic or potential)Electrical energyLight energySolar energyHeat energyKinetic energy is energy possessed by an object because of its motion while potential energy is energy possessed by an object because of its position or its condition.
The law of conservation of energy states that energy cannot be created nor destroyed but can only be transformed i.e. converted from one form to another.
Friction is a force that resists the relative motion or tendency to such motion of two bodies in contact.
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What is the period of a pendulum that is 1.3 m long?
Answers
Answer:
T≈2.2876585681s
Explanation:
Since you were not given the degrees of amplitude or radians of amplitude, we assume that the degrees of amplitude are less than 20∘ or 20∘ and we also assume that this is a simple pendulum
Why do we weigh less in the equator rather than in poles ?
Give all the reasons for this situation
Answers
Answer:
There are a few reasons why we weigh slightly less at the equator compared to the poles. Here are the main factors contributing to this phenomenon:
1. Centrifugal force: The Earth rotates on its axis, causing a centrifugal force at the equator due to the circular motion. This force acts opposite to gravity and reduces the effective gravitational pull at the equator. As a result, we experience slightly less weight at the equator compared to the poles.
2. Earth's shape: The Earth is not a perfect sphere but rather an oblate spheroid, meaning it is slightly flattened at the poles and bulges at the equator. This shape is due to the rotation of the Earth. As a result of this oblate shape, the distance between the center of the Earth and any object is greater at the equator compared to the poles. Since gravitational force decreases with distance, the gravitational pull is slightly weaker at the equator.
3. Altitude variation: The Earth's surface is not perfectly uniform, and there are variations in elevation and altitude across different locations. The force of gravity decreases as we move farther away from the Earth's center. At the poles, we are closer to the center of the Earth compared to the equator, resulting in a slightly stronger gravitational pull at the poles. Hence, our weight is slightly higher at the poles due to the smaller distance from the center of the Earth.
It's important to note that these differences in weight are extremely small and difficult to perceive with regular scales. The variation is typically on the order of a few tenths of a percent, so it has a negligible impact on our daily lives.
Which task would a colorectal surgeon perform?
1. analyzing patients' diets for food sensitivities
2. prescribing drugs to treat ulcers
3. correcting structural problems of the jaw
4. removing tumors in the large intestine
Answers
Answer:
d
Explanation:
Hai điện tích đặt cách nhau một khoảng R trong không khí thì lực tương tác
giữa chúng là 2.10−3N. Nếu khoảng cách đó mà đặt trong môi trường điện môi thì
lực tương tác giữa chúng là 10−3N. Để lực tương tác giữa hai điện tích đó khi đặt
trong môi trường điện môi bằng lực tương tác giữa hai điện tích đó khi đặt trong
không khí thì khoảng cách giữa 2 điện tích là bao nhiêu?
Answers
A 10 kg body is suspended by a rope is pulled
by means of a horizontal force to make 60°
by rope to vertical. The horizontal force is
1) 10 kgwt
2) 30 kgwt
3) 10/3 kgwt 4) 30/3 kgwt
Answers
Answer:
The correct option is;
3) 10·√3 kgwt
Explanation:
The parameters given are;
Mass of body, m = 10 kg
Direction of applied force = Horizontal
Angle of inclination of the rope with the vertical, θ = 60°
The component of the tension in the rope equivalent to the force is given by the relation;
T·sin(θ) = F
The component of the rope tension still under gravitational pull is given by the relation;
T·cos(θ) = m·g
Therefore, we have;
\(\dfrac{T \cdot sin(\theta)}{T \cdot cos(\theta)} = \dfrac{F}{m \cdot g}\)
Which gives;
\(\dfrac{sin(\theta)}{cos(\theta)} = tan(\theta) = \dfrac{F}{m \cdot g}\)
Therefore;
F = tan(θ) × m×g
Where:
g = Acceleration due to gravity
tan(θ) = √3
m = 10 kg
∴ F = 10·√3 × g = 10·√3 kg-wt.
A volleyball player spikes a volleyball over the net. The mass of the volleyball is 0.3 kg. The ball accelerates at 800 m/s2. What is the net force that accelerates the ball?
Answers
The magnitude of net force which is required to accelerate the ball is 240 Newtons.
What is the net force?The net force is the vector sum of all the forces which are acting on a particle or an object. The net force is a single force which replaces the effect of the original forces which are acting on the particle's motion.
F = m × a
where, F = net force,
m = mass of the object,
a = acceleration of the object
F = 0.3 × 800
F = 240N
Therefore, the net force which is required to accelerate the ball is 240 Newtons.
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What type of fuze is energized after the projectile is fired and functions when the projectile nears the target
Answers
Answer:
Proximity or variable time fuze
Explanation:
A fuze are components that produces a projectile bursting charge, thereby causing a detonating or release when its activation conditions are met.
There are different types of fuzes classified based on their function. Types are:
Time fuzes: This is a type of fuze that start to work after a projectile has been firedProximity or variable time fuze: This type of fuze is energized after the projectile is fired and function when the projectile nears the target.Percussion fuze: This type of fuze function when the projectile strike or penetrate a target.The overall distance between the sensor and the point at which the light passes through those glass elements is called?
Answers
Answer:
The overall distance between the sensor and the point at which the light passes through those glass elements is called the back focus distance.
What is a back focus distance?The back focus distance, which is also known as the flange-focal distance or register, is the distance between the mounting flange on a camera or lens and the focal plane.
The focal plane is the plane where the image is projected onto the camera's sensor or film.
What is the importance of back focus distance?
The back focus distance is important for proper focusing of the camera.
The focal plane should coincide with the camera's sensor or film for optimal image quality.
If the back focus distance is incorrect, the image will be out of focus or blurry.
Therefore, it is critical to ensure that the back focus distance is correct while installing or adjusting camera lenses or any other photographic equipment involving glass elements.
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a weight of 1.0 kn is suspended from the end of a horizontal strut (of negligible mass) 1.5 m long that projects from a wall. a supporting cable 2.5 m long goes from the end of the strut to a point on the wall 2.0 m above the strut. the tension in the cable is
Answers
By observing the tension table we can conclude that the correct answer is Option B ; T = 2 × \(10^4\)N
What is tension ?Any physical object that is in contact with another one can apply forces to that object.
Depending on the types of objects in touch, we label these contact forces differently. We refer to the force as tension if a rope, string, chain, or cable is one of the things applying the force.
The best demonstration of a tension force is when a rope is being pulled. The rope builds up a lot of tension when a pull force is applied to it. However, upon pulling on the rope, the tension is lost and the rope becomes slack.
Given mass = 1 kg
N - mg = ma
F = ma
and mg = ma because the object is static
thus N = 2mg
N = 2 × 1000 × 10
N = 2 × \(10^4\) N
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Imagine conventional current running up the right, around and back down left side of a loop of wire. The magnetic field inside the loop of wire will be directed ______.
a) out of the page.
b) into the page.
c) the fields will cancel each other out
Answers
The magnetic field inside the loop of wire will be directed into the page. Option b is correct.
When a current flows through a loop of wire, it generates a magnetic field around it. The direction of the magnetic field can be determined using the right-hand rule. If you curl the fingers of your right hand in the direction of the conventional current (from right to left in this case), your thumb will point in the direction of the magnetic field inside the loop. In this scenario, the current flows up the right side of the loop, then around the top and back down the left side.
Using the right-hand rule, the magnetic field inside the loop is directed into the page. This is because the magnetic field lines form a loop inside the wire, and the direction of the field is perpendicular to the plane of the loop, pointing into the center of the loop. Option b is correct.
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a child is pulling an empty cart attached by a rope that is parallel to the ground. the cart is moving with constant velocity, and its mass is 1.5 kg. suppose a mass of 7.5 kg is added to the sled, and its velocity stays the same. by what factor does the tension in the rope change?
Answers
The tension in the rope is changed by 75 N
Tension is the force that is transmitted through a body which can be a rope or a wire which is pulled from both sides. Whenever there is a rope being pulled from one side then according to Newton's third law, equal force is exerted by the rope on the other side. This transmission of forces is known as tension in that rope.
Given,
Mass 1 = m₁ = 1.5 kg
Mass 2 = m₂ = 7.5 kg + 1.5 kg = 9 kg
g = 10 m/s² = acceleration due to gravity
Tension in the rope when mass 1.5 kg is attached to the string,
T₁ = m₁g = 1.5 * 10 = 15 kg
Tension in the rope when mass 1.5 kg is attached to the string,
T₂ = m₂g = 9*10 = 90 kg
The change that tension undergoes
T₂ - T₁ = 90 - 15 = 75
Therefore, the factor by which the tension in the rope changes is 75 N
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If a stone has 390 J of energy and is moving with a speed of 12m/s, what is the mass of the stone?
Answers
Answer: 5.42 kg
Explanation:
The formula for kinetic energy is:
KE = 1/2 * m * v^2
where KE is the kinetic energy, m is the mass of the object, and v is the velocity of the object.
We are given the kinetic energy (KE) and velocity (v), so we can rearrange the formula to solve for the mass (m):
m = 2 * KE / v^2
Substituting the given values, we get:
m = 2 * 390 J / (12 m/s)^2
m = 2 * 390 J / 144 m^2/s^2
m = 5.42 kg (rounded to two decimal places)
Therefore, the mass of the stone is approximately 5.42 kg.
The first spacecraft which did not merely fly bya jovian (or giant) planet, but actually went into orbit around it for an extended period of time was
a. Galileo
b. Einstein
c. Voyager
d. the Hubble Space Telescope
e. Cassini
Answers
Answer:The first spacecraft which did not merely fly by a jovian (or giant) planet, but actually went into orbit around it for an extended period of time was option a, Galileo. The Galileo spacecraft was launched in 1989 and orbited Jupiter for almost eight years, from 1995 to 2003.
Explanation:
1. A particular solid material is heated but its temperature does not rise.
11
a) What is happening to the solid?
b) Where does the energy go that is being supplied to it?
Answers
\(\qquad\qquad\huge\underline{{\sf Answer}}\)
Here's the answer ~
1. The energy that has been given to the solid material is being used to change its phase from solid to liquid.
2. This all energy is converted into latent heat of fusion causing change in state. so there's no increase in temperature.
Answer →
a) The phase of solid material is changing due to Absorption of heat.
b) The energy that is being supplied to it is absorbed by the material to break the intermolecular bonds.
Explanation:
Heat is a mod of transfer of energy, and solid is a giant network of atom or ions closely bounded with high inter molecular forces. When the bonds are formed lead to release in energy hence to break the bond you need to supply energy and that energy supplier is heat. Generally there are two types of heat, one that you sense as rising temperature and another where you see a gradually change in the phase of material. When the heat that you supply is being absorbed that means the energy is being consumed(absorbed) by the material, to break the bonds, and you doesn't sense the temperature of material being raised but the change in state of material from solid→Liquid, solid→gas depends on the type compound, the phase of material changes, same thing happens in reverse case from Gas→Liquid, Liquid→Solid, the energy is released in atmosphere. this absorbed or released energy(heat) is Latent heat.
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what is a force that always resists the relative motion of objects or surfaces?
Answers
Friction is the resistance to motion of one object moving relative to another. It is not a fundamental force, like gravity or electromagnetism. Instead, scientists believe it is the result of the electromagnetic attraction between charged particles in two touching surfaces.
Which term is defined as "energy that moves from high to low along many pathways"? circuit board parallel switch electrical current series
Answers
The terminology which connotes energy that moves from high to low along many pathways is: electrical current.
What is an electrical current?An electrical current can be defined as a form of energy that is typically transmitted from high to low level, along several pathways (conducting paths) in an electric circuit.
This ultimately implies that, an electrical current refers to a terminology which connotes energy that moves from high to low along many pathways
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Answer:
circuit board
Explanation:
i took the test
Two mechanical waves are traveling through the same medium, and Wave X has an amplitude of 2 cm and Wave Y has an amplitude of 3 cm.How do the two waves' speeds compare?A. Wave X has a greater speed. B. Wave Y has a greater speed. C. Wave X and Wave Y share the same speed. D. The speed of the waves is impossible to compare without more data.Part 2Which best explains the correct answer to Part 1?A. The speed of a wave is always constant. B. The speed of a wave is directly proportional to its amplitude.C. The speed of a wave is determined by its wavelength and frequency.D. The speed of a wave is affected by the properties of the medium it is traveling through, not amplitude.
Answers
ANSWER:
1. C. Wave X and Wave Y share the same speed.
2. D. The speed of a wave is affected by the properties of the medium it is traveling through, not amplitude.
STEP-BY-STEP EXPLANATION:
The amplitude of a wave does not affect the speed at which the wave travels. Both wave A and wave B travel at the same speed. The speed of a wave is only altered by alterations in the properties of the medium through which it travels.
Therefore, in the first art the correct answer is C. Wave X and Wave Y share the same speed.
If the medium is uniform (does not change), the speed of the wave will be constant.
Therefore, the correct answer is: D. The speed of a wave is affected by the properties of the medium it is traveling through, not amplitude.
If the capacitor completely discharges in 2.5 ms, what is the average current delivered by the defibrillator
Answers
To calculate the average current delivered by the defibrillator, we need to use the formula I = Q/t, where I is the current, Q is the charge, and t is the time. In this case, we know that the capacitor completely discharges in 2.5 ms, which is equivalent to 0.0025 seconds. We also know that the charge on the capacitor is given by Q = CV, where C is the capacitance and V is the voltage.
Average Current (I_avg) = Charge (Q) / Time (t)
First, we need to find the charge (Q) using the formula:
Q = Capacitance (C) × Voltage (V)
Once you have the values for capacitance (C) and voltage (V), you can calculate the charge (Q) and then use it to find the average current (I_avg) using the formula mentioned earlier.
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If the distance between 2 charged particles is double, the force between them changes by a factor of?
Answers
Answer:
See explanation
Explanation:
Given that;
q1 and q2 are the magnitudes of the two charges while r1 is the distance between the charges.
F1 =kq1q2/r1^2
Then,
F2 = kq1q2/(2r1)^2
F2 = kq1q2/4r1^2
So,
F2 = 1/4 F1
The force between the charges changes by a factor of 1/4.
A rectangular solid is 5m long, 2m high and 4m wide. The mass of the solid is 300g. Find the density of this solid.
Answers
Answer:
Density = Mass / Volume
Mass = .3 kg
Volume = 2 * 5 * 4 = 40 m^3
Density = .3 g / 40 m^3 = .0075 kg / m^3
1 kg/m^3 = kg * 1000 g / kg / (1 m^3 * (100 cm/m)^3) = 10E-3 gm/cm^3
Density = 7.5 E-3 gm/cm^3
an object with no forces acting on it, will continue to move with constant:
true or false
Answers
True. An object with no forces acting on it will continue to move with constant velocity. When there are no external forces acting on an object, its velocity does not change.
The object, on the other hand, maintains a steady motion with the same speed and direction. This is known as Newton's first law of motion, also known as the law of inertia. Newton's first law of motion states that an object at rest will remain at rest, and an object in motion will remain in motion at a steady velocity in a straight line until an external force acts upon it. This implies that if there is no net force acting on an object, it will remain stationary or continue to move at a constant velocity. Newton's first law of motion may be used to explain why drivers and passengers in a vehicle continue to move forward when the vehicle brakes abruptly, while objects in the car that aren't strapped down may go flying. According to Newton's first law of motion, an object in motion remains in motion at the same speed and in the same direction unless acted upon by an external force. Because the person's body is in motion, it will continue to move forward at the same speed as the car until an external force, such as the seatbelt or airbag, brings it to a stop.
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which type of bell interacts more with high-pitched sounds?
Answers
According to the given information Small type of bell interacts more with high-pitched sounds.
What is high pitched and low pitch sound?High pitch sounds are those that have a high frequency. Shouts are frequently of rather high pitch. A whistle, for instance, appears to have a high pitch. Sounds with a low frequency rate have a low pitch.
How do you find high pitch sound?Downloading a sound level software would be the simplest approach to find out how loud this whining sound is (most are free). You want an app that measures both frequency (Hz) and decibel level simultaneously, while others simply measure decibel level (loudness). one which assesses both.
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What would happen to objects and people if there was no gravity
Answers
help please asappp.
Answers
Answer:
Radio
Explanation:
As the stonger the waves get the more compressed they get
A block of mass 8.5 kg is being pushed at a constant speed up a ramp that is raised 28o above the horizontal. If the coefficienct of kinetic friction between the ramp and the block is 0.34, what is the magnitude of the applied force?
Answers
The amount of applied force is 25.56 N if the ramp and the block have a 0.34 coefficient of kinetic friction.
How can you figure out how much force is being applied?The normal force, which is equal to the part of gravity that is perpendicular to the ramp, must first be determined:
mg = cos(28°)
N is equal to (8.5 kg)(9.81 m/s2)cos(28°).
N = 75.24 N.
friction equals N
friction equals (0,34) (75.24 N)
friction equals 25,56 N
Given that the block is travelling at a constant speed, the applied force must be equal to the force of friction in both magnitude and direction.
applied force = friction
Force exerted = 25.56 N
Consequently, the applied force is 25.56 N in size.
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