1) A boulder flies through the air at 10.3 m/s with kinetic energy 292J
With this info how do i find
A) The mass of the boulder?
What's the boulder's kinetic energy if its speed doubles?
C) What's the boulder's kinetic energy if its speed is halved?
2) A baseball with mass 0.145kg is pitched at 37.6 m/s. Upon reaching home plate, 16.9m away, its speed is 36.1m/s.
I have no idea how to find...
A) If the decrease is due entirely to drag, find the work done by the drag force.
Find the magnitude of the (assumed constant) drag force
3) How far must you compress a spring with k=668N/m in order to store 496J of energy
Where do I start?
4) The total mechanical energy of an object moving at 31.3m/s is 525J, and its potential energy is 174J
A) What's its mass?
I have no idea where to start and what formula to plug numbers. I can not find any of this in my notes......Help
k
N