Lulu gets a flat tire on her way to school. She gets out and attempts to push the car. For 60 minutes, she pushes and

pushes but the car never moves. How much work did Lulu perform as she unsuccessfully tried to move the car?

What is the relative energy expense of galloping rather than trotting at 3.5 m/s?

Which scientist discovered the two radioactive elements radium and polonium?

Objects 1 and 2 attract each other with a electrostatic force of 72.0 units. If the distance separating objects 1 and 2 is changed to one - halved the original value (i. e, halved), then the new electrostatic force will be

An outbreak of a dangerous infectious disease occurred in several areas across a large city. The Centers for Disease Control (CDC) was notified immediately, and they isolated the people who had the disease.

If the earth takes 24hours to rotate about it's axis, calculate the mean angular speed of the earth

Which is normally greater: static friction or sliding friction on the same object? Static friction is normally greater than dynamic friction. On the same object, static friction and dynamic friction are equal.

A child pulls a wagon 3.0 m using a force of 55 N at an angle 35° above horizontal. The force of friction on the wagon is 12 N. Calculate the net work done on the wagon

Which of these accurately describes a chemical reaction A. products and reactants combine to form new reactants. B. Reactants combine to form products C. Products and reactants combine to form new substances D. Products combine to form reactants

Why construction is present near the bulb

Water, with a density of rho = 1125 kg/m 3 rho=1125 kg/m3, flows in a horizontal pipe. In one segment of the pipe, the flow speed is v 1 = 6.53 m/s v1=6.53 m/s. In a second segment, the flow speed is v 2 = 1.17 m/s v2=1.17 m/s.