Other Physics Answers

A 0.2kg is drag 0.5m upward with a uniform velocity along a plane inclined 30° with the horizontal by a force parallel to the incline. The coefficient of kinetic friction between the object and the plane is 0.25. How much work is done by the applied force? Show complete solution.

A basketball is shot through the air, hitting the backboard of a hoop. During the shot, the basketball was travelling at 8 m/s, and right after hitting the backboard, the basketball travels 1 m/s in the opposite direction. The mass of a standard basketball is 590g.

a. Find the kinetic energy of the basketball before hitting the backboard (2pts)

b. Find the kinetic energy of the basketball after hitting the backboard (2pts)

c. Find the work done by the backboard to the basketball (2pts)

John carries a 175-N suitcase up three flights of stairs ( a height of 10.0m) and then pushes it with a horizontal force of 36.0N at a constant speed of 0.5m/s for a horizontal distance of 20.0meters. How much work does John do on his suitcase during this entire motion? Show complete solution.

A particle moving in the xy plane undergoes a displacement given by d=2.0m as a constant force F= 5.0N acts on the particle. Calculate the work done by F on the particle. Show complete solution.

In 10 seconds, a disc accelerates uniformly from rest to a rational velocity of 20 rotations per second. Calculate the flywheel's angular acceleration in rad/s²?

A 1.8 kg mass is oscillating at the end of a steel spring with an amplitude of 20cm. The spring constant, k, is 500 N/m. Calculate:

(a) the angular frequency.

(b) the maximum velocity of the oscillating mass.

(c) the total energy of the oscillating mass.

If the grandfather clock is running slow, how would you adjust the length of the pendulum to correct the timer?

If a mass spring system is hung vertically and set into oscillation, why does the motion eventually stop? 

4. An object 3 cm tall is placed 8 cm in front of a convex mirror of focal length 10 cm.

(i) Draw ray diagrams to locate the image formed.

(ii) What is the magnification of the image formed? (Hint: Magnification = image height (II')/object height (OO') or image distance/object distance or v/u.) 

1. If a Ferrari, with an initial velocity of 10 m/s, accelerates at a rate of 50 m/s/s for 3 seconds, what will its final velocity be?

2.     While traveling along a highway a driver slows from 24 m/s to 15 m/s in 12 seconds. What is the automobile’s acceleration? (Remember that a negative value indicates a slowing down or

deceleration.)

3.     A cyclist accelerates at a rate of 7.0 m/s². How long will it take the cyclist to reach a speed of 18 m/s?