Other Physics Answers

A trophy sits on top of a shelf 2.30 m above the floor. If the trophy has a potential energy of 90 J, its mass is __________ kg.

A trolley rolls down a slope at a constant acceleration.

It travels 8.0 m in 4.0 s.

(a) Plot the velocity-time graph for the motion of the

trolley

(b) Find the acceleration of the trolley

A car drove away from its stationary position with a constant acceleration of 5.0 m s-2. 

Plot its motion in the velocity-time graph below for the first 5.0 seconds of travel.

(a)   How long does it take the car to reach a speed of

20.0 ms-l?

(b)  How far did the car travel during this time?

A car starts from rest and accelerates at a constant rate, reaching a speed of 5.0 m s-^ in 10.0 s. 

It then travels at this speed for 30.0 s before coming to a stop in another 5.0 s.

(a) Plot the velocity-time graph of the car.

(b) Find the total displacement of the car.

A football was moving at a speed of 1.2 ms-1 when it was kicked towards the opposite direction.  The impact time was 0.2 s and the final speed was 5.0 m s-1.  Find the average acceleration of the ball during the impact.

A 10.0cm long thin glass rod is uniformly charged to +50.0nC. A small bead, charged -5.0nC is 4.0cm from the center of the rod. What is the force (both magnitude and direction) on the bead?

a simple pendulum has a period of 2.4s on earth. the height of the bob is 0.5m. what will linear velocity of the bob be at the bottom of its swing

An arrow moving at 10 m/s is stopped by a target. If the arrow has a mass of 250 g and penetrates 4 cm into the target, what is the force exerted by the arrow on the target?

What is the radius of the nucleus of 28/14 Si ? What is its volume?

The speed of light is 299,792,458 m/s.

a. Express this number in standard form.

a. Express speed of light up to three significant figures.