A forklift raises a box above the floor and does 2,000 J of work. If the forklift motor consumes 3,000 J of electrical energy from the battery to raise the box, what is the efficiency of the lift?

Which halogen is an essential part of the diet for the thyroid gland to function properly?

If earth began to shrink, but its mass remained the same, what would happen to the value of g on earth's surface?

An object stays at rest until what happens to it?

If a person weighs 125 lbs, 8oz., how many mg does s/he weigh

If two automobiles collide, they usually do not stick together. Does this mean the collision is elastic? Explain why a head-oncollision is likely to be more dangerous than other types ofcollisions.

A new cannon was being developed in a science lab. The instructor wanted to do some testing of the cannon's ability to launch objects with different masses. The instructor used tennis balls and filled them with lead, rocks, and styrofoam.

Two machines, A and B, each working at a constant rate, can complete a certain task working together in 6 days. In how many days, working alone, can machine A complete the task?

Austin and his friends are pushing a heavy box up a ramp. How can they increase the rate at which the box is moving?

A lightbulb has a voltage of 120 V and uses a current of. 75 amps. What is the electric power used by the lightbulb? Show work

Wind blows at the speed of 30m/s across a 175m^2 flat roof if a house. what is the pressure difference between inside the house and the outside of the house just above the roof?