It takes a runner 320 s to travel a final position of +1000 m at a velocity of +2.5 m/s. What was the runner's initial position
The position of the runner up traveling at a velocity of +2.5 m/s is -200 m.
What is position?Position is the location of the object (whether it's a person, a ball, or a particle) at a given moment in time.
To calculate the initial position of the runner up, we use the fomula below.
Formula:
d = vt-D.......... Equation 1Where:
d = Initial position of the runner upv = Velocity of the runner upt = TimeD = Final position of the runner upFrom the question,
Given:
v = 2.5 m/st = 320 sD = 1000 mSubstitute these values into equation 1
d = (2.5×320)-1000d = 800-1000d = -200 mThe position of the runner up is -200 m.
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A driver of a car traveling at -15m/s applies the brakes, causing a uniform acceleration of +2.0m/s2. If the brakes are applied for 2.5s, what is the velocity of the car at the end of the braking period? How far has the car moved during the braking period?
Given :
Initial velocity, u = -15 m/s.
Acceleration , a = 2 m/s².
Time taken to applied brake, t = 2.5 s.
To Find :
The velocity of the car at the end of the braking period.
How far has the car moved during the braking period.
Solution :
By equation :
\(v = u+at\\\\v=-15 + 2\times 2.5\\\\v=-10 \ m/s\)
Now, distance covered by car is :
\(s=ut+\dfrac{at^2}{2}\\\\s=(-15)(2.5)+\dfrac{2(2.5)^2}{2}\\\\s=-31.25\ m\)
Hence, this is the required solution.
Gases, just like liquids are made of particles which can be further classified as atoms or molecules,
True
False
Answer:
True
Explanation:
Solids, Liquids, and Gases are all make up of atoms and molecules.
if a 50 N block is resting on a steel table with a coefficient of static friction
If F = 37 N, the static frictional force between the block and the table and the minimum force required to move it must be equal.
How is the minimum force of static friction determined?It is the force that regulates itself. The value of static friction varies from zero to the smallest force required to initiate motion. The formula for determining static friction is as follows: Normal Force divided by the static friction coefficient is static friction.
Is weight equivalent to static friction?Although the maximum static friction will rise, the frictional force will always be the same as the weight in mg because friction cannot accelerate an object. Because FrN can take any value less than N to balance the weight, this is the case.
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1.) What is the equation for Average Speed?
In ptolemy’s earth-centered model for the solar system, venus always stays close to the sun in the sky and, because it always stays between earth and the sun, its phases range only between new and crescent. The following statements are all true and were all observed by galileo. Which one provides evidence that venus orbits the sun and not earth?.
in one to two sentences explain how electromagnets move a maglev train
Electromagnets are used to create a magnetic field which levitates the train above the track, and then by varying the current in the electromagnets, the train can be propelled forward or slowed down or stopped.
How does magnetic train levitate?Maglev trains use the principle of electromagnetic suspension to levitate and propel the train. Electromagnets are placed on the underside of the train, and these electromagnets are energized with a current that creates a magnetic field.
This magnetic field interacts with the magnetic field of a conductor in the track, which creates an upward force that levitates the train above the track.
Once the train is levitated, the next step is to propel it forward. The same electromagnets that are used for levitation can be used to propel the train forward.
By varying the current in the electromagnets, the magnetic field created can be made to push or pull the train forward or backward. This process is known as magnetic propulsion or maglev propulsion.
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A slab of thermal insulator is 200cm square in cross section and 5cm thick.If thermal conductivity is0.50 and temperature difference is 150 what is the heat flow through the slab in 2 days
Answer: 5184 kJ
Explanation:
Given
Area of cross-section \(A=200\ cm^2\)
thickness of slab \(t=5\ cm\)
thermal conductivity \(k=0.5\ W/m-K\)
temperature difference \(\Delta T=150\ K\)
Heat flow is given by
\(\Rightarrow Q=kA\dfrac{dT}{dx}\\\Rightarrow Q=0.5\times 200\times \dfrac{150}{5}\times 10^{-2}\\\Rightarrow Q=30\ W\ or\ 30\ J/s\)
for 2 days time period, it is
\(t=2\ days\ or\ 2\times 24\times 60\times 60\ s\\t=1,72,800\ s\)
Heat flow in 2 days
\(Q=30\times 172800=5184000=5184\ kJ\)
A 2000 kg car accelerates from 0 to 25 m/s in 21.0 s. How much is the average power delivered by the motor? (1hp=746W) 50 hp 60 hp 90 hp 80 hp 70 hp
The average power delivered by the motor is 80 hp.
We can find the work done by the motor by calculating the change in kinetic energy of the car. The change in kinetic energy is given by:
ΔKE = 1/2 m(v^2 - u^2)
Where:
ΔKE is the change in kinetic energy
m is the mass of the car
v is the final velocity of the car
u is the initial velocity of the car
ΔKE = 1/2 * 2000 kg * (25 m/s)^2 - (0 m/s)^2
= 250,000 J
Now that we know the change in kinetic energy and the time it takes the car to accelerate, we can find the average power delivered by the motor by plugging these values into the equation for power:
Power = Work / Time
= 250,000 J / 21.0 s
= 12,380 W
= 80 hp
Therefore, the average power delivered by the motor is 80 hp.
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For years, the tallest tower in the United States was the Phoenix Shot Tower in Baltimore, Maryland. The shot tower was used from 1828 to1892 to make lead shot for pistols and rifles and molded shot for cannons and other instruments of warfare. Molten lead was dropped from the top of the 82.15 m tall tower into a vat of water. During its free fall, the lead would form a perfectly spherical droplet and solidify. Determine the velocity of the droplet right before it hits the ground.
Answer:
The velocity of the droplet right before it hits the ground is 40.08 m/s.
Explanation:
To determine the velocity of the droplet right before it hits the ground,
From one of the equations of kinematic for free fall motions,
v = u + gt
Where v is the final velocity
u is the initial velocity
g is acceleration due to gravity (take g = 9.8 m/s²)
and t is time
For the question, v is the velocity of the droplet right before it hits the ground.
u = 0 m/s (Since the molten lead was dropped from rest)
Therefore,
v = gt
First, we will determine the time t
Also, from one of the equations of kinematic for free fall motions,
h = ut + 1/2(gt²)
u = 0 m/s
From the question, the molten lead was dropped from the top of the 82.15 m tall tower, therefore
h = 82.15
Hence,
82.15 = 0×t + 1/2 (9.8 × t²)
82.15 = 1/2 (9.8 × t²)
82.15 = 4.9 t²
t² = 82.15/4.9
∴ t = 4.09 secs
Now, for the velocity v, of the droplet right before it hits the ground,
Recall
v = gt
Then,
v = 9.8 × 4.09
v = 40.08 m/s
Hence, the velocity of the droplet right before it hits the ground is 40.08 m/s.
What is the magnetic force on a particle that has 0.000500 C of charge and is moving at
2.50 10m/s to the right through a magnetic field that is 4.20 T and pointing away from
you? Specify both magnitude and direction in your answer.
Answer:
1.) F = 5.3×10^-3 N
2.) Positive y - direction
Explanation:
The parameters given are:
Charge q = 0.0005C
Velocity V = 2.5010 m/s
Magnetic field B = 4.2 T
Magnetic force F = BVqsinØ
F = BVq
since Ø = 90 degree
Substitute all the parameters into the formula
F = 4.2 × 2.5010 × 0.0005
Therefore, the magnetic force on a particle is F = 5.3 × 10^-3 N
2.) According to Fleming's left hand rule, the direction of the magnetic force will be perpendicular to the magnetic field which moving upward of the screen.
Answer:
it’s f=0.0005 x 2.5 x 10^5 x 4.20
F= 525 N
+ y direction (up)
Explanation:
got it right
A man running at 5 M/S increases his velocity to 10 M/S in 2 Seconds. What was his acceleration?
Astrology, that unlikely and vague pseudoscience, makes much of the position of the planets at the moment of one's birth. The only known force a planet exerts on Earth is gravitational.
(a) Calculate the magnitude of the gravitational force exerted on a 4.20 kg baby by a 100 kg father 0.200 m away at birth (he is assisting, so he is close to the child).
(b) Calculate the magnitude of the force on the baby due to Jupiter if it is at its closest distance to Earth, some 6.29×10^11 m away. How does the force of Jupiter on the baby compare to the force of the father on the baby?
Other objects in the room and the hospital building also exert similar gravitational forces. (Of course, there could be an unknown force acting, but scientists first need to be convinced that there is even an effect, much less that an unknown force causes it.)
The magnitude of the gravitational force is 7×10⁻⁷ N
Baby weighs (m₁) 4.20 kg.
Father weighs (m₂) 100 Kg.
The gravitational force (F) between the body and the earth has a magnitude of 6.67×10⁻
The separation between them is: 0.200 m
The gravitational constant is
F=Gm₁×m₂÷ R²
F= 6.67×10⁻¹¹×4.20×100÷ (0.200)²
F= 7×10⁻⁷ N
Gravitational force: The gravitational force between any two mass-containing objects causes them to be drawn together. The gravitational force is said to as attractive because it continually seeks to unite masses rather than to drive them away. In truth, you and everything else in the universe are being pulled in different directions. It is referred to as Newton's Universal Law of Gravitation.
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Suppose a spaceship heading straight towards the Earth at 0.55c can shoot a canister at 0.55c relative to the ship. What is the speed of the canister relative to the Earth? A. 0.10c B. 0.55c C. 0.89c D. 1.10c
the relativistic addition of velocities formula: v = (u + w) / (1 + uw/c^2), where v is the relative are velocity in a between two objects moving at velocities u and w relative to a third reference frame. In this case, u is the velocity of the spaceship relative
the speed of the canister relative to the Earth is not simply 1.1c (the sum of the velocities of the spaceship and canister) is due to the effects of special relativity. At such high speeds, the relativistic addition of velocities formula must be used to properly calculate the relative velocities between objects moving at significant fractions of the speed of ligh
where V is the combined velocity, v1 is the velocity of the spaceship (0.55c), v2 is the velocity of the canister relative to the spaceship (0.55c), and c is the speed of light. Plug in the values into the formula V = (0.55c + 0.55c) / (1 + (0.55c * 0.55c) / c^2)Simplify the equation.V = (1.10c) / (1 + 0.3025) Complete the calculation .V = 1.10c / 1.3025V ≈ 0.89c the speed of the canister relative to the Earth is approximately 0.89c, which is option C.
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The distance between an object and a reference point is the object's what?
Answer:
Displacement
Explanation:
The distance between an object and a certain reference point is called displacement. This is not to be confused with distance, which represents the total distance the object has travelled to get a certain point, regardless of how long it is. Displacement always represents the shortest distance (a straight line) between the initial and final points.
Answer:
Displacement is the distance and direction of an object's change in position from a reference point. Suppose a runner jogs to the 50-m mark and then turns around and runs back to the 20-m mark.
Which direction will thermal energy flow if you pick up a snowball with your bare hand? Thermal energy will flow from the snowball to your hand. Thermal energy will flow from your hand to the snowball. Thermal energy will not flow between your hand and the snowball.
Answer:
b. Thermal energy will flow from your hand to the snowball.
Explanation:
Answer:
B
Explanation:
The SI units for position, velocity, and acceleration are, respectively: Question 11 options: m, m/s, m/s^2 kg, m/s, m^2/s m, m/s, m^2/s kg, m/s, m/s^
The SI units for position, velocity, and acceleration are, respectively: m, m/s, m/s^2
Position is measured in meters (m). Velocity is measured in meters per second (m/s). Acceleration is measured in meters per second squared (m/s^2).
Velocity:
Velocity is the directional velocity of a moving object as an indicator of the rate of change of position, observed from a certain frame of reference and measured at a certain time reference (eg 60 km/h northward). Velocity is a fundamental concept in kinematics, a branch of classical mechanics that describes the motion of bodies.
Acceleration:
Acceleration is the rate of change of an object's velocity with respect to time. Acceleration is a vector quantity (as long as it has magnitude and direction). The direction of an object's acceleration is given by the direction of the net force acting on that object. The magnitude of the object's acceleration described by Newton's second law.
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What is wheel. and axle? Explain its structure with the help of a diagram
Answer:
The wheel and axle consist of a round disk, known as a wheel, with a rod through the centre of it, known as the axle. This system uses angular momentum and torque to do work on objects, typically against the force of gravity. The wheel and axle simple machine is closely related to gears.
Explanation:
Help please (20 pts) I think it's C
What does "think of concrete examples" mean?
A. It means you come up with as many examples as you can in five minutes.
B. It means your thinking is getting too stiff, like concrete.
C. It means you think about how you can imagine the problem as a concrete block.
D. It means think of a real-life example you can relate to that has to do with what you’re learning.
Answer:
I'm not sure it is c I'm sure it is d
What should be the nature of fuse wire?
Answer: a fuse wire is a wire of high resistance and low melting point.
Moby lifted Tim off the ground a distance of 2 meters using a force of 2N. How much work did Moby do?
Answer:
4 J
Explanation:
As I guess,
From the equation,
work done = force × distance travelled
= 2 × 2
= 4 J
There are no conversions since all are given in the standard form.
From 1997 to 2012, the number of farms in Georgia . From 1910 to 1990, the number of farms in the United States . Based on these trends, both numbers most likely will in the future.
Answer:
-During the last 100 years, the number of farms has tripled. However, the number has decreased con- siderably since the peak was reached in 1935. We now have 355 thousand fewer farms than in 1900. Actually the change in the number of farms with full-time operators was much greater than indicated by these figures.
Explanation:
A dog pulls on a leash and the leash pulls on the dog. The reaction force is...
answer choices
o the dog pulls on a leash
o the leash pulls on the dog
The reaction force in the scenario of a dog pulling on a leash is that the leash pulls on the dog.
According to Newton's third law of motion, for every action, there is an equal and opposite reaction. In the given scenario, when the dog pulls on the leash, it exerts a force on the leash in one direction. As a result, the leash exerts an equal and opposite force on the dog in the opposite direction, known as the reaction force. This is because the leash resists the dog's pulling force, creating tension in the leash. The reaction force allows the dog to feel the resistance and tension of the leash, effectively preventing the dog from moving forward freely. Therefore, the reaction force in this case is that the leash pulls on the dog. It is important to note that the reaction force is a result of the dog's action and is of equal magnitude but opposite in direction.
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A long distance runner running a 5.0km track is pacing himself by running 4.5km at 9.0km/h and the rest at 12.5km/h. What is his average speed?
Answer:
9.26 km/h
Explanation:
Applying,
V' = D'/t'............... Equation 1
Where V' = Average speed, D' = Total distance, t' = total time.
Given: D' = 5 km
But,
v = d/t............ Equation 2
Where v = speed , d = distance, t = time
t = d/v............ Equation 3
Given: d = 4.5 km, v = 9 km/h, and d = 0.5 km, v = 12.5 km/h
Therefore,
t₁ = 4.5/9 = 0.5 hours
t₂ = 0.5/12.5
t₂ = 0.04 hours
Therefore,
V' = 5/(0.5+0.04)
V' = 5/0.54
V' = 9.26 km/h
How many grams of glucose are needed to prepare 250 grams of a 5% glucose solution?
Answer:
Percentage of solution= 5
Mass of solution= 250g
% of solution=
Mass of solution
Mass of solute
×100
∴ Mass of solute=
100
5×250
=12.5g
Explanation:
hope it's help
what would happen after a warm front passes to the air
After a warm front passes through the air, the air becomes more warm and humid.
If warm air mass replaces the cold air mass, it is called as warm front. A warm front is called as transition zone. Warm fronts usually move from southwest to northeast. Warm fronts move slower than cold fronts.
When a warm front passes over a region there will be some significant weather changes. Before the warm front passes precipitation will be light to moderate, snow, sleet or drizzle and after the front has passed there will be usually no precipitation.
Therefore, after a warm front passes through the air, the air becomes more warm and humid.
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if a Firebird travels at a velocity of 0 to 60 mph in four seconds traveling east what was the acceleration of the Firebird
Answer:
6.7 m/s^2
Explanation:
The formula of acceleration is:
\(\displaystyle{\vec{a} = \dfrac{\Delta \vec{v}}{\Delta t} = \dfrac{v_2 - v_1}{t_2-t_1}}\)
where \(\displaystyle{\vec{a}}\) is acceleration, \(\displaystyle{\vec{v}}\) is velocity and \(\displaystyle{t}\) is time. \(\displaystyle{v_2}\) means final velocity. \(\displaystyle{v_1}\) means initial velocity, \(\displaystyle{t_2}\) means final time and \(\displaystyle{t_1}\) means initial time.
We are given that the Firebird travels at velocity of 0 to 60 mph in four seconds. Therefore:
Our initial velocity starts at 0 mph.Our final velocity is at 60 mph.Our initial time is 0 second.Our final time is 4 seconds.Since it travels to the east then our vector will be positive. However, acceleration has to be in m/s^2 unit (Sl unit) so we'll have to convert from mph (miles per hours) to m/s (meters per second) first.
We know that:
A mile equals to 1609.344 meters.An hour equals to 60 minutes which a minute equals to 60 seconds. So 60 minutes will equal to 3600 seconds.Now we divide 1609.344 by 3600 to find a unit rate of m/s:
\(\displaystyle{\dfrac{1609.344}{3600} \ \, \sf{m/s}}\\\\\displaystyle{= 0.44704 \ \, \sf{m/s}}\)
Now multiply 0.44704 m/s by 0 and 60 to get velocity in m/s unit:
Initial velocity = 0 m/sFinal velocity = 60 * 0.44704 = 26.82 m/sTime is already in second so no need for conversion. Substitute known information in the formula:
\(\displaystyle{\vec{a} = \dfrac{26.82-0}{4-0}}\\\\\displaystyle{\vec{a} = \dfrac{26.82}{4}}\\\\\displaystyle{\vec{a} = 6.7 \ \, \sf{m/s^2}}\)
Therefore, the Firebird will accelerate at the rate of 6.7 m/s^2.
A charged particle that has gained or lost electrons is called a:.
Answer:
A particle that has gained: Anion
A particle that has lost: Cation
Explanation:
\({}\)
**s. O. P** (statement of the problem) need ngayon hehe thank youu!! Cleansing surface spots: an alternative to nylon-based cleaning brushes derived from coconut husk
An excellent green, eco-friendly substitute is coconut coir, a byproduct of coconuts. Due to its ability to clean without endangering the ecosystem, coir is becoming increasingly popular and adopted.
The shell of the coconut is known as coco coir. It is immersed in water for a few weeks after extraction to help it loosen and soften. The husk is then dried, brushed, and turned into a product that resembles fibre but is much stronger. Because of the product's durability, stretching or compressing it in any way won't harm it.
Fine brushes, ropes, beds, upholstery, and fishnets are all made from white coco coir, which is extracted from unripe coconuts.
Brown coco coir is pressed from ripe coconuts and used to create mats, pots, and scrubbers that resemble discs for cleaning kitchen surfaces and utensils. In the kitchen, these naturally antimicrobial items are preferable to plastic scrubbers. When they begin, they can be recycled as an organic planting substrate because they are not toxic.
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How much heat is required to be removed from a 8kg liquid water at 33 °C to be transformed into ice at 0 °C?
The Total heat required to transform 8 kg of liquid water at 33 °C to the ice at 0 °C is 13,019 J.
The heat required to be removed from a liquid to transform it into a solid is called the heat of fusion. For water, the heat of fusion is approximately 334 J/g. To calculate the amount of heat required to transform 8 kg of liquid water at 33 °C to the ice at 0 °C, we'll need to take into account both the heat of fusion and the heat required to lower the temperature of the water from 33 °C to 0 °C.
First, we'll calculate the heat required to lower the temperature of the water from 33 °C to 0 °C. This can be calculated using the formula:
Q = mcΔT
where Q is the heat required, m is the mass of the water (8 kg), c is the specific heat capacity of water (4.186 J/g·°C), and ΔT is the change in temperature (3temperature change
Q = (8 kg)(4.186 J/g·°C)(33 °C) = 10,347 J
Next, we'll calculate the heat of fusion by multiplying the heat of fusion of water (334 J/g) by the mass of the water (8 kg).
Q = (334 J/g)(8 kg) = 2672 J
To sum up, the total heat required to transform 8 kg of liquid water at 33 °C to ice at 0 °C, is equal to the heat required to lower the temperature + heat of fusion which is 10,347 J + 2672 J = 13,019 J
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