Other Physics Answers

Sam, Choi, Mich, Pia, and Sheen are on a 6’ x 4’ rectangular balsa. They are having trouble in keeping the balsa balanced as they are unaware of their center of mass. Find their center of mass, given the following: Sheen is at 1 foot west of the balsa’s geometric center. She weighs 75 kg. 

2. A taxi driver goes around a rotunda, unsure of his exit. He slows down and speeds up as he approaches the exits of the rotunda, seeing if it’s the exit he’s looking for. While he is slowing

down, what is the direction of his:

a. Centripetal Acceleration

b. Tangential Acceleration

c. Velocity

Explain why the directions of those values are point in their directions.

A ferris wheel has a radius of 7.62m and spins at a constant speed of 0.67m/s. If you were riding in

one of the baskets of the ferris wheel:

How long would it take you to complete one ride of 12 revolutions?

The earth is, on average, 150 million kilometers from the sun. Calculate its average speed in orbit.

Determine the diffusion coefficient Dn for electrons in intrinsic Si at T=300 K for the

following two conditions. (i) For intrinsic Si (ii) For extrinsic Si (For intrinsic Si µn=1360 cm2/V.s and

for extrinsic Si µn=110 cm2/V.s.)

Two small positively charged spheres have a combined charge of 5.0x10^-5 C. If each sphere is repelled from the other by an electrostatic force of 1.0 N when the sphere are 2.0 m apart, what is the charge on each sphere?

Two gliders move frictionlessly towards each other. Glider A has a mass of 2.5 kg and is moving right at a speed of 3.0 m/s. Glider B has a mass of 2.1 kg and is moving left at a speed of 1.2 m/s. Glider B is cushioned by a spring with a spring constant of 1.5 × 10⁴ N/m. Determine the maximum compression of the spring during the collision.

Your Answer:

During a trick shot demonstration, a pool player shoots a 170 g cue ball directly at a 150 g billiard ball that is moving towards the cue ball with a velocity of 1.2 m/s. The perfectly elastic collision between the billiard ball and the cue ball occurs when the cue ball is moving at a velocity of 5.9 m/s. Determine the velocity of the billiard ball and the cue ball directly after the collision.

Note: For this question, please include all of your work on your written solution. Include the velocity for both the cue ball and the billiard ball. There is no need to place your answer in the answer box for this problem (it only checks the velocity of the cue ball).

A 41 kg skateboarder running at 4.5 m/s [N] jumps onto a 4.4 kg skateboard moving at 2.5 m/s [N]. How fast will the skateboarder and board be traveling once she jumps on the board?

Your Answer: