What causes more friction, wax paper, aluminum foil, or plastic wrap

Suppose a 48-N sled is resting on packed snow. The coefficient of kinetic friction is 0.10. If a person weighing 660 N sits on the sled, what force is needed to pull the sled across the snow at constant speed?

What is an aerodynamic shape? What is the definition?

A toroidal inductor has a circular cross-section of radius a a. The toroid has N turns and radius R. The toroid is narrow (a≪R), so the magnetic field inside the toroid can be considered to be uniform in magnitude.

How long will it take light moving at 300,000 km/s to reach us from the sun?

Como se encuentra el agua a una temperatura menor de 0ºC

What is the effect of a magnetic field on a stationary electric charge on a moving electric charge?

A ball is thrown upwards with an initial velocity of 25. o m/s, what is the velocity of the ball at 11.9 m from the ground?

Can rocks be weathered by wind and chemicals in the air

1. if you rub a neutral glass rod with silk, the silk acquires a negative charge. if you rub a neutral glass rob with a rubber rob, the rubber rod acquired a negative charge.

What's a scientific inquiry