4. A bullet of mass 30 g is fired from a rifle of mass 5kg at a speed of 259m/s.  a) What is the momentum of the rifle just after the bullet is fired? 

b) What is the recoil velocity of the rifle?​

Which of the following is an example of units for speed

If an astronaut takes an object to the moon the following is true (choose only one). a the mass will change but the weight will be the same. b both the mass and the weight of the object will be the same. c the weight will change but the mass will be the same. d both the mass and the weight of the object will change.

1kg of water needs to recieve 4200j of energy to go from 90 degrees to 91 degrees. what is the specific heat capacity of water? what are the units?