Which simple machine is a doorknob?

a lever

a screw

a pulley

a wheel and axle

What is a example of nuclear fusion

The mass density of an object is 16.3 g/cc, and its volume is determined to be 16.7 cc. what is the mass of the object?

Which of these is the most effective way for manny to cool down after kickboxing? start static stretches to increase his flexibility walk around to lower his heart rate sit and catch his breath to avoid light-headedness run one to three miles to

The concentration of an isotope is 1/500 of its initial value after one day. What is the rate of decay?

A spring required a force of 5.0 n to compress it 0.1 m. How much work is required to stretch the spring 0.4 m?

At a certain harbor, the tides cause the ocean surface to rise and fall a distance d (from highest level to lowest level) in simple harmonic motion, with a period of 12.4 h. how long does it take for the water to fall a distance 0.

What is the average speed of an object with a total distance traveled of 45 meters in 50 seconds

Some machines do not multiply the force that is applied to them

An automotive research facility is testing a new design on bumpers to determine the force at which it will break.

Gravity is greater when there is