Jennifer hits a stationary 200. gram ball and it leaves the racket at 40. m/s. If time lapse photography shows that the ball was in contact with the racket for 40. ms:
(a) What average force was exerted on the racket?
(b) What is the ratio of this force to the weight of the ball?
(a) 0.20 kN
(b) 1.0 × 102
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Velocity Addition: Two spaceships approach each other along a straight line at a constant relative velocity of 0.9880c as measured by the captain of one of the ships. An observer on Earth is able to measure the speed of only one of the ships as 0.9000c. From the point of view of the observer on Earth, what is the speed of the other ship in terms of the speed of light?
Fill in the blank(s) with the appropriate word(s).
The nucleus of lead-208, 
, has 82 protons within a sphere of radius 6.34 × 10?15. Each electric charge has a value of 1.60 × 10?19 C. Assuming that the protons create a spherically symmetric distribution of charge, calculate the electric field at the surface of the nucleus.
What will be an ideal response?
Which of the following characteristics are held in common by both gravitational and electrostatic forces when dealing with either point masses or charges?
a. potential energy is a function of distance of separation b. forces are conservative c. inverse square distance law applies d. all of the above choices are valid
A 3.0-kg block moves up a 40° incline with constant speed under the action of a 26-N force acting up and parallel to the incline. What magnitude force must act up and parallel to the incline for the block to move down the incline at constant velocity?
a. 14 N b. 12 N c. 16 N d. 18 N e. 25 N