Why is the efficiency of a machine never 100%

How do changes in the mass of an object affect its motions?

Which renewable resource could become a nonrenewable resource if used faster than Earth's ability to replenish its supply? A. water B. manganese C. sunlight D. wind

Has scientific knowledge changed over time?

What force is required to accelerate a 1,100 kg car to 0.5 meters squared

If the president vetoes a bill, it can still become law If congress overrides the presidents veto with ___ majority

A large balloon is initially filled to a volume of 1.96 l at 318.44 k and a pressure of 2.89 atm. what volume of gas will the balloon contain at 1.77 atm and 336.33 k?

How to calculate kinetic energy? (physics/physical science)

What's the difference between the offspring of an asexual organism and a sexual organism

The contamination that results from the spread of bacteria from meat to vegetables is called

A rock has a mass of 5 kg on the moon. What is the mass of the rock on the earth