Work output of a machine is always less that the work input due too

Ball 1, with a mass of 10kg, is moving to the right at 20 m/s. Ball 2 is moving to the left at 20 m/s. Upon collision, ball 2 comes to a standstill, and ball 1 moves to the left at twice its origional speed. What is the mass of ball 2?.

Does a set of all sets contain itself?

A neutral atom of the element that comes just before platinium in the periodic tablet has

Which answer best describes the concept of metabolism? A: the oils in a nut yield energy for the squirrel B: in the fall a bear builds a den C: A person is shivering in the cold wind D: mold grows in a damp area

Muscles make up ore than __ of a person body? a. 10 b. 25 c40 d. 75

Which process causes wells on land to become saline, making them unusable for drinking water? A. Erosion B. Echo sounding C. Eutrophication D. Groundwater infiltration

A farmer uses a tractor to pull a 150 kg bale of hay up a 15∘ incline to the barn at a steady 5.0 km/h. The coefficient of kinetic friction between the bale and the ramp is 0.40. Part A What is the tractor's power output?

Identify the conditions for an elastic collision in a closed system. Check all that apply. Energy is conserved. Velocities may change. Momentum is conserved. Kinetic energy is conserved. Objects stick together after the elastic collision.

When the velocity of a mass on a spring is zero, the acceleration is at

Which is a disadvantage of using wind as an energy source? Check all that apply. It may be unreliable. It is not naturally occurring. It produces a lot of waste. It requires wires to carry electricity. It generates large amounts of electricity.