# A car initially at rest undergoes uniform acceleration for 6.32 seconds and covers a distance of 120 meters. What is the approximate acceleration of the car?

2 months ago

## Solution 1

Guest #6876843
2 months ago

Answer : The approximate acceleration of the car is,

Solution : Given,

Initial velocity of the car = 0 m/s

Distance covered = 120 meter

Time taken = 6.32 second

Using second law of motion,

where,

s = distance covered

u = initial velocity

t = time taken

a = acceleration

Now put all the given values in the above equation, we get

Therefore, the approximate acceleration of the car is,

## Solution 2

Guest #6876844
2 months ago
Using kinematic equation s=ut + 1/2 at^2(u = initial velocity=0, s=120m, t= 6.32s), 120 = 0(t) + 1/2 a(6.32)^2. a = 120x2/(6.32)^2 = 6m/s^2.

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It is A. hope this helps
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1) WRONG. Since gravitational force is an attractive force.
2) WRONG. The Earth does accelerate but the acceleration is so small that it's negligible. However it DOES ACCELERATE.
3) CORRECT.
4) WRONG. Mass means gravitational field, so Nina might be small compared to the Earth but it still creates a gravitational field around her. This answer is also wrong because it's breaking Newton's third law of action-reaction. If Earth pulls Nina, then Nina pulls the Earth back with the same force. Yes, with the SAME FORCE, however F=m*a, so the great difference in mass makes Nina's acceleration much bigger than the Earth's one.
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The speed of an object determines the amount of inertia? True or False
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A plane is traveling with an air velocity of 720 kilometers/hour due east. It experiences a headwind of 16 kilometers/hour. Find the resultant velocity and direction of the plane with respect to the ground.
Solution 1

The resultant velocity and direction of the plane with respect to the ground is 704 km/h due east.

Explanation:

Given that,

Air velocity v₁= 720 km/h

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Select all the correct answers. In which situations is work being done? A. Hannah leans against her locker, but it doesn’t move. B. Andy’s car rolls down a hill with the engine off. C. A wind turbine stands still on a sunny, windless day. D. A balloon expands as it is heated by the Sun. E. James pedals a stationary exercise cycle that doesn’t move.
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E. James pedals a stationary exercise cycle that doesn’t move.

B. Andy’s car rolls down a hill with the engine off.
These Answer's Are Correct For It Show's Work Being Done A Car Moving Is Working, Pedaling A Exercise Machine Is Working Even If It Doesn't Move It Is Meant To Help You Work Out Pedaling Help's There Is No Need For It To Move.
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Explanation:

Work is done when the force is applied to an object then there will be displacement by the object.

In the option A,  Hannah leans against her locker, but it doesn’t move. There is no displacement in this case. The work done is said to be zero in this case.

In the option B,  Andy’s car rolls down a hill with the engine off. There is displacement in this case. The work is said to done in this case. At the hill, the car has a maximum potential energy.

When it rolls down then the kinetic energy of the car will increase. From the work energy theorem, the change in the kinetic energy is equal to the work done.

In the option C, A wind turbine stands still on a sunny, windless day.  The work done is said to zero in this case.

In the option,  A balloon expands as it is heated by the Sun. There is expansion of the balloon. The work is done in this case as the volume and the pressure will also increase on heating the balloon.

In the option E, James pedals a stationary exercise cycle that doesn’t move. No work is done in this case.

Therefore, the statements B and D are correct answers.

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A sedimentary rock composed of which of the following would weather at a faster rate? Zircon Quartz Calcite Sand
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sand

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no

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Which situation best describes the act of reducing? paying bills online instead of sending paper through the mail donating gently used clothes and household items using plastic bags a second time to avoid buying new ones buying products that can be recycled so they don’t end up in the trash
Solution 1

paying bills online instead of sending paper through the mail

Explanation:

In today's era everyone is aware about the Climate change and wants to contribute towards environment protection. A simple technique is to follow four R's which are: Reduce, Reuse, Recycle and Refuse. The four examples given over here are examples of each R as explained below:

Reduce:  paying bills online instead of sending paper through the mail as we are reducing the paper use over here.

Reuse: donating gently used clothes and household items so that they can be reused. Using plastic bags a second time to avoid buying new ones.

Recycle & Refuse: buying products that can be recycled so they don’t end up in the trash

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A - i think
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Which item is made from an alloy? steel tray glass plate credit card copper wire
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Steel Tray

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If a car travels 30 mi. north for one-half hour, 50. mi. east for one hour, and 30 mi. south for 30 min., what is the total distance the car traveled?
Solution 1

110 mi

Explanation:

d1 = 30 mi, d2 = 50 mi, d3 = 30 mi

Distance is defined as the length of actual path traveled.

So, total distance, d = d1 + d2 + d3 = 30 + 50 + 30 = 110 mi

Solution 2
50 miles to the east hope it helps
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A 45 kg student runs up a flight of stairs that are 3.2 m high in 2 seconds. How much power did the student use during this time? 706 W 288 W 72 W 7.0 W
Solution 1

The power used by the student is equal to 706.32 W. Therefore, option A is correct.

### What is power?

The power can be demonstrated as the rate of doing work and can be defined as the work done in unit time. The SI unit of power can be expressed as joules per second (J/s) or Watt.

Power can be described as a time-based parameter and the rate at which work is done on a body. The mathematical formula for power can be represented as mentioned below.

Power = Work/ time

P = W/t

Given, the mass of the student, m = 45 kg

Consider, the height of the stairs, h = 3.2 m

The work done by the student, W = mgh,

W = 45 × 9.81 × 3.2

W = 1412.64 J

The power used by the student, P = W/t

P = 1412.64/2

P = 706.32 W

Therefore, the power did the student use during this time is 706.32 W.

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Solution 2
Power = work done/time. Work done by gravity = mgh = 45x9.8x3.2 = 1411.2J. Therefore, power = 1411.2/2 = 705.6 ~ 706W.
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A 6000 kg train car traveling at 2.5 m/s collides with another 6000 kg train car, now they are both moving but with a speed of 1.25 m/s. This is an example of
Solution 1
A 6000 kg train car traveling at 2.5 m/s collides with another 6000 kg train car, now they are both moving but with a speed of 1.25 m/s. This is an example of Conservation of Momentum.You can prove it by (6000kg)(2.5m/s)+(6000kg)(0m/s= (6000+6000kg)(1.25m/s).

Hope this helps :)
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Solution 2
This is an example of inelastic collision because after collision they both move with same velocity.

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