If you have to apply 40 N of force to a crowbar to lift a rock that weighs 400 N, what is the actual mechanical advantage of the crowbar?

One of the purposes of an experiment is to determine whether the dependent variable affects the independent variable. T or F?

A rock is thrown from a bridge at an angle 30∘ below horizontal. immediately after the rock is released, is the magnitude of its acceleration greater than, less than, or equal to g?

A cartilaginous fish has no hinged structures that enable it to open and close its mouth. A. True B. False

Remembering the Battle of Bunker Hill what did general Harry and his troops do

Echnician a says that to prevent injuries in an auto accident, all steering columns have a break-off steering wheel. technician b says that to prevent injuries in an accident, all steering columns are now fitted with a flexible rubber tube.

Why does Mars have moons even when its mass is small?

During the forging process for a steel sword, the blacksmith places a hot iron blank into a cold bucket of water. Which of the following happens? A. The water molecules move faster. B. The steel molecules move faster. C.

If you are trying to balance a seesaw and you have a higher mass on the left, should the mass on the right be placed at a greater distance or lower distance to balance it? Why?

What are copper atoms held together by

Which of the following are the top two job expectations of people who career plan? Select all that apply. A. Hours B. benefits C. type of work D. coworkers E. security