An object of mass m traveling at speed 
in the +x direction hits an identical object at rest. Characterize each of the collision outcomes shown below as being (A) absurd or (C) credible. (The collisions are not necessarily elastic, but they are not super-elastic.)
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Mass on a Spring: A 1.5-kg cart attached to an ideal spring with a force constant (spring constant) of 20 N/m oscillates on a horizontal, frictionless track. At time t = 0.00 s, the cart is released from rest at position x = 10 cm from the equilibrium position.(a) What is the frequency of the oscillations of the cart?(b) Determine the maximum speed of the cart. Where does the maximum speed occur?(c) Find the maximum acceleration of the mass. Where does the maximum acceleration occur?(d) How much total energy does this oscillating system contain?(e) Express the displacement as a function of time using a cosine function.
What will be an ideal response?
What are the two basic conditions necessary for laser action?
What will be an ideal response?
The force of gravity on a bowling ball rolling along a horizontal surface doesn't change its speed because the force is
A) small compared to the ball's weight. B) canceled by the normal force. C) perpendicular to its direction of motion. D) canceled by friction.
A swimmer swims 20 laps in a north-south facing pool in 7.00 minutes. Her first lap is toward the north. Her displacement and average velocity are
a. 0; 0. b. 0; 2.38 m/s, south. c. 0; 2.38 m/s, north. d. 1 000 m, south; 2.38 m/s, south. e. 1 000 m, north; 2.38 m/s, north.