Two things collide and stick together, which is true? a) momentum is not conserv

Question

Two things collide and stick together, which is true? a) momentum is not conserved but kinetic energy is b) kinetic energy is not conserved but momentum is c) both kinetic energy and momentum are conserved. d) neither momentum nor kinetic energy are conserved. A mass on a spring has been pulled out some distance x. You pull it out to double distance, 2x. How have the magnitude of the force on the mass and the spring potential energy changed? a) The force been divided by 2 and so has the potential energy b) The force has been divided by 2 but the energy multiplied by 2 c) The force has been multiplied by 2 and the energy multiplied by 4 d) The force has been multiplied by 2 and the energy divided by 4 You throw a ball at a certain angle above a horizontal tine. What angle would make the ball go furthest in horizontal distance when it comes back to the same height? Assume you always throw the ball with the same speed. a) 30 degrees b) 45 degrees c) 60 degrees d) 90 degrees An ice skater pulls in arms and spins faster. This is an example of: a) The conservation of momentum b) The conservation of angular momentum c) The application of a torque d) Work done by gravitational potential energy

Explanation / Answer

7) this is inelestic collision so momentum only conserved , kinetic energy is not conserved

8) f = kx

if x double f is double

u = 1/2kx^2

if x doubvle then u is 4 times

9) 45

10) conservation of angular momentum

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