A2.0-kg mass is attached to one end of a spring with a spring constant of 100 n/m and a 4.0-kg mass is attached to the other end. the masses are placed on a horizontal frictionless surface and the spring is compressed 10 cm. the spring is then released with the masses at rest and the masses oscillate. when the spring has its equilibrium length for the first time the 2.0-kg mass has a speed of 0.36 m/s. the mechanical energy that has been lost to this instant is:

Suppose a comet has an orbital period of 309.1 years around the sun. what is it’s average distance from the sun?

3. a worker pushes a 30.5 kg polished stone along a polished table with a force on bonin a straight line for 5.20 s after starting from rest. there is no friction between thestone and the table. at the end of the table. the stone is hooked to a cable with a lengthof 62.0 cm to rotate it to a rough table to store until they can be picked up. the roughtable has a coefficient of static friction 0.702 with the polished stone. remember that 8= 9.80 m/s2a) what is the speed of the stone when it is hooked to the cable? b) what is the tension in the cable while the stone is rotating? (there is still nofriction)c) how much force is needed to make the stone begin sliding from rest on therough table? ius = 0.70262.0 cm30.5 kg20.5 kg6= 0

Which describes increasing the efficiency of energy resource