Answers
Answer:
B is the correct answer
Explanation:
I just did this question
Related Questions
describe below are 5 situations that involve fraction. You tell me if friction is acting like friend or foe?
Answers
Given:
5 different situations.
To find:
To determine if the friction is acting as a friend or a foe.
Explanation:
Friction is the force that opposes the motion of an object. Thus it is always directed in the direction opposite to the direction of motion of the object.
1. In this situation, your kinetic energy is transferred into heat through frictional force and hence you get scratches. Thus in this situation, the friction is acting as a foe.
2. To turn the bike around a sharp curve, the centripetal force is required to keep the bike on the track. The frictional force provides the necessary centripetal force. Thus without friction, the bike would slide off the track and the rider will be injured. Thus in this case the friction is acting as a friend.
3. When you are racing down, the friction force acts in the direction opposite to the direction you are racing and thus helping you to move forward without slipping. Thus the friction is acting as a friend in this case.
4. As friction is acting in the direction opposite to the direction you are pushing the desk, some of the work you are doing will be wasted to overcome the frictional force. Thus, in this case, the friction is acting as a foe.
5. As soon as you see the possum, you apply the brake. The frictional force between the tires and the road helps you to come to stop by acting in the direction opposite to the direction of motion of the car. Thus in this case the friction is acting as a friend.
Final answer.
1. Friction is a foe.
2. Friction is a friend.
3. Friction is a friend.
4. Friction is a foe.
5. Friction is a friend.
On the upper surface of Jupiter's atmosphere, the attractive force of gravity is 2.5 times that on Earth. What would a bathroom scale show if a 50 kg person were weighed on Jupiter?
Answers
Explanation:
The weight of an object is the force of gravity acting on it. Therefore, we can use the formula:
where mass is the mass of the person and gravitational acceleration is the acceleration due to gravity on Jupiter.
On Earth, the acceleration due to gravity is approximately 9.8 m/s^2. On Jupiter, the acceleration due to gravity is 2.5 times that on Earth, so it is:
2.5 x 9.8 m/s^2 = 24.5 m/s^2
Therefore, the weight of a 50 kg person on Jupiter would be:
weight = 50 kg x 24.5 m/s^2 = 1225 N
So a bathroom scale on Jupiter would show a weight of approximately 1225 newtons (N) for a 50 kg person
The weight of a 50 kg person on Jupiter can be calculated using the following formula:
Weight on Jupiter = Mass x Gravity on Jupiter
where the mass of the person is 50 kg and the gravity on Jupiter is 2.5 times that on Earth, which is approximately 24.79 m/s^2.
Weight on Jupiter = 50 kg x 24.79 m/s^2
Weight on Jupiter = 1239.5 N
Therefore, a bathroom scale would show a weight of 1239.5 Newtons for a 50 kg person on the upper surface of Jupiter's atmosphere.
why might calcium be a important in the diet of many living things
Answers
Answer:
Calcium is an essential mineral that is important in the diet of many living things as it plays several important roles in the body:
1. Bone and teeth formation: Calcium is a key component of bones and teeth, making them strong and healthy.
2. Muscle function: Calcium plays a critical role in muscle contraction and relaxation, helping muscles function properly.
3. Nerve function: Calcium is involved in the transmission of nerve impulses, which allows for proper communication between nerve cells.
4. Blood clotting: Calcium is required for blood clotting, which is important for preventing excessive bleeding after an injury.
5. Cellular signaling: Calcium is involved in many cellular signaling pathways, helping to regulate various physiological processes in the body.
Therefore, having an adequate amount of calcium in the diet is crucial for the overall health and well-being of many living organisms.
Dantes peak 1997: the scientists know an eruption is immanent because the _____ are swarming and the ______ readings increase.
Answers
The scientists in the 1997 film "Dante's Peak" know an eruption is coming because of "rats" are congregating as well as the "sulfur dioxide" measurements are rising.
Is the mountain Dante's Peak real?Peak Dante | 1997 Wallace, located in Idaho's Western Rockies in the Bitteroot Alps, serves as the model for the fictional hamlet of "Dante's Peak". Digitally added elements include "Dante's Peak" and the surrounding alpine environment. The setting for Michael Cimino's novel Heaven's Gate was Wallace.
A failure, Dante's Peak?Dante's Peak may not have been warmly accepted at the time as it was treated seriously. It was a dreadful bomb that barely made $175 million just at movie office, like its rival Volcano.
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What is the average time for the toy car to move 1.0 m on tile? 20.2 s 24.4 s 28.1 s 60.7 s
Answers
What is the frequency of a wave that has a period of 0.5 seconds?
A. 0.5 Hz
B. 2 Hz
C. 200 Hz
D. 20 Hz
Answers
Answer:
B. 2 Hz
Explanation:
Given parameters:
Period of the wave = 0.5Hz
Unknown:
Frequency of the wave = ?
Solution:
Frequency is the number of waves that passes through a point.
Period is the time taken for a number of waves to pass through a point.
Period is the inverse of frequency
Frequency = \(\frac{1}{t}\)
t is the period
Frequency = \(\frac{1}{0.5}\) = 2Hz
Answer:2
Explanation:
The
states that price and quantity move in opposite directions.
Answers
The Law of Demand states that price and quantity move in opposite directions.
What does the law of demand mean?According to the Law of Demand, there is an indirect correlation between a good or service's price and the amount of that good or service that customers are willing and able to purchase. In other words, consumers are less able and willing to purchase an item as its price rises and vice versa.
This connection between a product's price and demand for it in terms of quantity is captured by the Law of Demand. It asserts that the price of a good and the amount desired are negatively) relate
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2. In Erikson's eight stages of psychosocial development, toddlerhood is marked by
Answers
Autonomy versus shame and doubt is the second stage of Erik Erikson's stages of psychosocial development. This stage occurs between the ages of 18 months to around age 2 or 3 years. According to Erikson, children at this stage are focused on developing a greater sense of self-control.
A student slides a block on a surface by applying a force of 11 newtons (N) toward the left. The friction force on the block is 4 N.
Answers
A student slides a block on a surface by applying a force of 11 newtons (N) toward the left. The friction force on the block is 4 N and which is in right direction. the Net force acting on the box is 11-4 = 7N.( towards left)
Force is responsible for the motion of an object. it produces acceleration in the body. According to newton's second law force is mass times acceleration i.e. F =ma. Its SI unit is N which is equivalent to kg.m/s². There are two types of forces, balanced force and unbalanced force. Balanced forces are those forces which are opposite in direction and equal in magnitude. When Net force acting on a body is zero then we call it as balanced force. Balanced force is not responsible for the motion of the body. ex. when two persons pulling rope on both end with equal magnitude which cause them to be balanced force have 0 net force. Unbalanced forces are those when resultant of all the forces is not equal to zero is called as unbalanced force. unbalanced force is responsible for the motion of the body.
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A negative test charge experiences a force to the right as a result of an electric field. Which is the best conclusion to draw based on this description?
Answers
The most logical conclusion to make in light of the facts available is that the electric field is directed to the left. This conclusion may be drawn from the fact that a negative test charge, which is attracted to positive charges and repels other negative test charges, feels a force to the right.
The force applied to the negative test charge suggests the presence of positive charges in the electric field, indicating that the field lines begin with positive charges and end on negative charges since opposing charges attract.
The assumption that electric field lines originate from positive charges and end on negative charges is supported by this deduction. As a result, in this situation, the electric field is directed leftward.
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Which of the following is not among the uses of dimensional analysis? (a) determination of the Numerical constant (b) to convert one system of unit to another (c) to change the units of derived quantities (d) to test the correctness of an equation
Answers
To convert one system of unit to another of derived quantities is not a use of dimensional analysis.
What is dimensional analysis?Checking for consistency in the dimensions on both sides of an equation entails looking at the dimensions of the physical quantities involved in a problem, such as length, mass, time, electric charge, and temperature.
The core tenet of dimensional analysis is that physical quantities, such as length, mass, and time, may be described in terms of their basic dimensions.
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All of the options listed are included in the uses of dimensional analysis.
What is dimensional analysis?Dimensional analysis is a powerful tool used in physics to:
check the correctness of equations derive new equationsconvert units from one system to anotherdetermine numerical constants that relate physical quantities.The dimensional analysis involves analyzing the dimensions of physical quantities and using them to establish relationships between them.
By using the principles of dimensional analysis, we can simplify complex physical problems and gain insights into the behavior of physical systems.
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If a shopping cart is pushed by a person exerting 50 J of work on it, what is the energy transfer to the shopping cart if it has a mass of 2 kg?
A. 52 J
B. 50 J
C. 25 J
Answers
Answer:
B
Explanation:
If ⃗ is the vector sum of ⃗ and ⃗⃗, ⃗ = ⃗ + ⃗⃗, what must be true about the directions and magnitudes of ⃗ and ⃗⃗ if = + ? What must be true about the directions and magnitudes of ⃗ and ⃗⃗ if = 0?
Answers
The magnitude of the vector sum of 2x and 3y is determined as 3.6 units and the direction is 56.3⁰.
Magnitude of the vector
The magnitude of two vectors is determined using the following formula;
\(|V| = \sqrt{V_x^2 + V_y^2}\)
Let the sum of the vector = 2x + 3y
The magnitude of the vectors is calculated as follows;
\(|V| = \sqrt{2^2 + 3^2} \\\\|V| = 3.6 \ units\)
Direction of the vectorsThe direction of the vectors is calculated as follows;
\(tan(\theta) = \frac{V_y}{V_x} \\\\tan(\theta) = \frac{3}{2} \\\\tan(\theta) = 1.5\\\\\theta = tan^{-1} (1.5)\\\\\theta = 56.3 \ ^0\)
Thus, the magnitude of the vector sum of 2x and 3y is determined as 3.6 units and the direction is 56.3⁰.
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2.
Select the correct answer.
Erica is working in the lab. She wants to remove the fine dust particles suspended in a sample of oil. Which method is she most likely to use?
Answers
Answer:
Reverse Osmosis
Explanation:
Reverse osmosis is a type of filtration that involves passing a solvent through a semipermeable membrane in the opposite direction that natural osmosis does. Separation is always enforced through the use of pressure in this process. Ions, fine dust particles, molecules, and larger particles are typically removed from solvents using this method. The technique is particularly popular in the treatment and purification of water.
Answer:
filtration is used to separate
a car with a mass of 2000kg is traveling at a velocity of 50 m/s. the engine supplies a force of 1000N forward.the force of friction is 1000 N backwards. What is the velocity after 5 seconds
Answers
Answer:
no
Explanation:
ok
HELP!!
You are traveling at a speed of 70 miles per hour. How long did it take you to travel 2400 miles?
Answers
Answer:
So do 2400 divided by 70. I got 34.285714 and the numbers behind the decimal are repeating. If you round it you get 34.3
We assume the existence of a uniform electric field E0 =484 i N/C without specifying which charges are the cause. To this field is added that of a point charge q1 = 4 μC located at the origin. What is the resultant electric force acting on a charge q2 = 7 μC located at the point ( 6.7 m; 5.6 m)?
Answers
The resultant electric force acting on a charge q₂ is 0.0063 N.
What is electric force?Electric force is the repulsive or attractive interaction of two charged bodies. Newton's laws of motion describe the impact and effects of any force on a given body.
The x-component of electric force is
= {484 + 9×10⁹×4×10⁻⁶×6.7/(6.7²+5.6²)^(3/2)} × 7×10⁻⁶ N
= 0.0059 N
The y-component of electric force is
= 9×10⁹×4×10⁻⁶×5.6/(6.7²+5.6²)^(3/2)} × 7×10⁻⁶ N
= 0.0021 N
Hence, the resultant force is = √{(0.0059)²+(0.0021)²} N.
= 0.0063 N.
Hence, the resultant electric force is 0.0063 N..
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A pitot tube (the figure) is used to determine the airspeed of an airplane. It consists of an outer tube with a number of small holes B (four are shown) that allow air into the tube; that tube is connected to one arm of a U-tube. The other arm of the U-tube is connected to hole A at the front end of the device, which points in the direction the plane is headed. At A the air becomes stagnant so that VA = 0, At B, however, the speed of the air presumably equals the airspeed B of the plane. Use Bernoulli's equation to derive a formula giving the air speed in terms of the difference h in the liquid levels in that tube, the density rho of the liquid in the U-tube, and the density of air Pair. Suppose that the tube contains alcohol and the level difference h is 34.0 cm. What is the plane's speed relative to the air? The density of the air is 1.14 kg/m3 and that of alcohol is 810 kg/m3. Air Hole A Liquid Number Units
Answers
The plane's speed relative to the air is 63.3m/s.
What is relative speed?
When two or more bodies (objects) travel at the same or different speeds in the same or different directions, the concept of relative speed is applied. As a result, relative speed can be defined as a concept that calculates the speed of one moving body in relation to another moving body traveling at the same speed.
For example, if two people are running in opposite directions, the relative speed of one of them to the other stationary body can be calculated because the bodies are moving in opposite directions at the same time. Thus, relative speed can be defined as the speed of a moving body in relation to another stationary body.
The difference between the bodies is calculated while calculating the relative speed of bodies moving in the same direction.) Bernoulli's equation gives p A =p b+ 1 ρ air v²
2
However, △=p A −p B =ρgh
in order to balance the pressure in the two arms of the U-tube.
Thus ρgh= 1 ρ air v²
2
, or v = √2ρgh
√ ρ air
(b) The plane's speed relative to the air is
v= ρ air 2ρgh =√2(810kg/m 3 )(9.8m/s 2 )(0.260m) =63.3m/s
√ 1.03kg/m³
Hence, the plane's speed relative to the air is 63.3m/s.
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A trebuchet launches a pumpkin at an angle of 63 degrees at an initial velocity of 51 m/ s from the ground. What is the range of the pumpkin?
Answers
Answer:
214.72m
Explanation:
The range (R) of a projectile can be calculated using the formula:
R = u²sin2θ/g
Where R = Horizontal range
u = initial velocity
θ = angle of initial velocity
g = acceleration due to gravity (9.8m/s²)
According to the provided information in this question, R= ?, u= 51m/s, θ = 63°, g = 9.8m/s².
Hence, R = u²sin2θ/g
R = 51² × sin 2×63/ 9.8
R = 2601 × sin 126/9.8
R = 2601 × 0.809/9.8
R = 2104.25/9.8
R = 214.72m
Jane climbs the stairs to the first floor all by herself in a certain time. If the next time she rides the elevator to the first floor then which of the following statements is true?
The work done in both cases are different
the time taken in both cases is the same
the power in both cases is the same.
the work done in both cases is the same.
Answers
Answer:
the power in both cases is the same.
Explanation:
hope helps you
thanksss
55) A typical arteriole has a diameter of 0.080 mm and carries blood at the rate of 9.6×10^−5 cm3/s. (a) What is the speed of the blood in an arteriole? (b) Suppose an arteriole branches into 8800 capillaries, each with a diameter of 6.0×10^−6 m. What is the blood speed in the capillaries? (The low speed in capillaries is beneficial; it promotes the diffusion of materials to and from the blood.)
Answers
ANSWER:
a) 1.91 cm/s
b) 0.039 cm/s
STEP-BY-STEP EXPLANATION:
a)
Here, since we need the velocity in cm/s, we assume that a small volume of blood passes through the section of the arteriole in a given time.
So, we have to divide the blood flow by the area of the arteriole section, therefore:
\(A=\pi\cdot\mleft(\frac{d}{2}\mright)^2\)d = 0.08 mm = 0.008 cm
Replacing:
\(A=3.14\cdot\mleft(\frac{0.008}{2}\mright)^2=0.00005024=5.024\cdot10^{-5}cm^2\)We calculate the speed by dividing the rate by the previous calculated area, like this:
\(\begin{gathered} v=\frac{q}{A} \\ \text{Replacing} \\ v=\frac{9.6\cdot10^{-5}}{5.024\cdot10^{-5}} \\ v=1.91\text{ cm/s} \end{gathered}\)b)
First we find the area of the section of the capillaries:
\(\begin{gathered} d=6\cdot10^{-6}m=6\cdot10^{-4}cm \\ R\text{eplacing} \\ A=3.14\cdot\mleft(\frac{6\cdot10^{-4}}{2}\mright)^2 \\ A=0.0000002826=2.826\cdot10^{-7}cm^2 \end{gathered}\)Now we have to remember that the flow is dividid in equal parts, so the volume by seconds is:
\(\begin{gathered} q=\frac{9.6\cdot10^{-5}}{8800} \\ q=1.09\cdot10^{-8}\frac{cm^3}{s} \end{gathered}\)So the speed in this case is:
\(\begin{gathered} v=\frac{q}{A} \\ v=\frac{1.09\cdot10^{-8}}{2.826\cdot10^{-7}} \\ v=0.039\text{ cm/s} \end{gathered}\)This latter speed is less than in the main arteriole.
The way in which one atom interacts with another atom is mostly influenced by the configuration of the
A. electrons farthest from the nucleus.
B. protons in the center of the nucleus.
C. electrons closest to the nucleus.
D. protons on the outer edge of the nucleus.
Answers
The way in which one atom interacts with another atom is mostly influenced by the configuration of the electrons farthest from the nucleus.
Option A.
What is atom?An atom can be defined as the smallest part of a substance that cannot be broken down chemically. Each atom has a nucleus (center) made up of protons (positive particles) and neutrons (particles with no charge).
The arrangement of electrons in orbitals and shells around the nucleus is referred to as the electronic configuration of the atom.
Thus, we can conclude that the way in which one atom interacts with another atom is mostly influenced by the configuration of the electrons farthest from the nucleus.
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Which of the following is an electric potential?
A. 2.5C
B. 2.5 J
C. 2.5 N
D. 2.5 V
Answers
Answer:
D. 2.5 V
Explanation:
Electric potential of a point in space is a scalar magnitude that allows a measurement of the electric field at that point to be obtained through the electrostatic potential energy that a electric charge would acquire if it is placed at that point.
Hope this helps a lot!!
This is physics thanks .:)
Answers
The image formed when an object is placed at the center of the curvature of a concave mirror is real.
What are the characteristics of the image?
When an object is placed at the center of curvature (D₀ = R) of a concave mirror, the image formed is known as the real and inverted image.
The image characteristics are as follows:
Nature: Real and Inverted
The image formed by a concave mirror when an object is placed at the center of curvature is a real image, which means that the light rays actually converge at a point in front of the mirror, forming an inverted image.
Size:
The size of the image formed at the center of curvature of the concave mirror is the same as the size of the object. Therefore, the image size is equal to the object size.
Position:
The position of the image formed is at the center of curvature (C) of the concave mirror. Hence, the distance of the image from the mirror is equal to the distance of the object from the mirror, i.e., Dᵢ = D₀ = R.
Real or Virtual:
The image formed is real because the light rays converge at a point in front of the mirror, and the image can be obtained on a screen.
Magnification:
The magnification of the image formed is unity, which means that the size of the image is the same as that of the object. Hence, the magnification is equal to one.
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report of "fan made of plastic bottle" with string
Answers
Fan made of plastic bottle is an innovative way to reuse plastic bottles and can be easily made at home. This can be done by following simple steps, and a few materials are required to make it. The fan can be created by using a plastic bottle, scissors, string, a ruler, and a marker.
First, the bottle needs to be cut into half, and the upper part needs to be cut into three equal sections, then fold each section to make a blade. With the help of a ruler and marker, make a mark on each section, then make a hole in the center of each blade. Insert a string through the holes and tie the ends of the strings. The fan is ready to use by holding the string and swinging it back and forth.
The use of plastic bottle fans can significantly reduce the number of plastic waste and provide a practical solution to avoid environmental pollution. Besides, it is easy to make, and the materials are readily available, which can be used for various occasions, such as picnics, camping, or any outdoor activities.
In conclusion, the creation of a fan made of plastic bottle with string is an excellent way to reuse plastic bottles and can be made with simple steps. This project encourages everyone to contribute to environmental protection by utilizing what is available at home and reducing the number of plastic wastes.
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Explain why an airplane flying fromNew York to Los Angeles has both kinetic energy and potential energy.(finished) Inter what other forms of energy are present in the airplane. Words in the book: radiant energySound energyThermal energyMechanical energyElectric energy Gravitational potential energyChemical potential energy Nuclear energy
Answers
gravitational potential energy- and
Mechanical energy, because mechanical energy is = Potential energy + kinetic energy.
12 Rajiv made a model of a boat. When he places it in water, it sinks. According to
Archimedes' principle, why does the boat sink?
A The boat is too small.
B The buoyant force is less than the boat's weight.
C The buoyant force is equal to the boat's weight.
D The buoyant force is greater than the boat's weight.
Answers
Answer:
the answer is .D
Explanation:
force is greater than the boats weight
Answer: The buoyant force is less than the boats weight.
When a pencil 10 cm long is placed vertically 100 cm from a lens of focal length +50 cm, image is
Answers
Answer:
Explanation:
When a pencil 10 cm long is placed vertically 100 cm from a lens of focal length +50 cm, image is formed at a distance of 50 cm from the lens. The image is inverted and is 50 cm tall.
Water is flowing in a pipe with a varying cross-sectional area, and at all points the water completely fills the pipe. At point 1 the cross-sectional area of the pipe is 0.070 m^2, and the magnitude of the fluid velocity is 3.50 m/s.
Required:
a. What is the fluid speed at point in the pipe where the cross-sectional area is 0.105m^2?
b. What is the fluid speed at point in the pipe where the cross-sectional area is 0.047m^2?
c. Calculate the volume of water discharged from the open end of the pipe in 1.00hour.
Answers
Answer:
b
Explanation:
Pitch refers to A. how high or low a note is. B. the loudness of a note. C. the length of the note. D. the range of notes in the composition.
This is music by the way.
Answers
Answer:
A
Explanation:
OKAY REAL QUICK A NOTE REPRESENTS THE 12 TONES ON THE CHROMATIC SCALE WHICH IN TURN REPRESENTS THE WHOLE OF SOUND IN ALL MUSIC- EACH NOTE HAS A PITCH THAT REPEATS IN EVERY OCTAVE.