A mover pushes a 30 kg crate across a level florr with a force of 250 N, but the crate accelerates at a rate of only 5.83 m/s squared because a friction force opposes the crate's motion. What is the magnitude of the force of friction?

If mass is 18 kg and force 20 pascal find acceleration

Visible light with a wavelength of 480 nm appears as what color?

What happens when the temperature of a substance decreases significantly? A. Most substances will expand. B. Most substances will gain atoms. C. Most substances will disappear. D. Most substances will contract.

The form of energy that can move from place to place across the universe is (Gravitational Potential Energy, Radiant Energy, Thermal Energy, Vibrational Energy). On Earth, the main source of this energy is (Lightning, the Moon, the Sun, wind).

Three liquids are at temperatures of 5 ◦C, 25◦C, and 34◦C, respectively. Equal masses of the first two liquids are mixed, and the equilibrium temperature is 17◦C.

If the abosolute of a gas is 600 k, the temperature in degrees Celsius is

How does an electromagnetic wave propagate itself? a. A changing magnetic field induces an electric field perpendicular to the magnetic field. b. A changing electric field induces a magnetic field perpendicular to the electric field. c.

Which of the following is an example of convection? A. hot air rising and cooler air falling B. a hot object transferring heat to a cooler one C. a hot oven warming the air around it D. the rays of the Sun warming the earth

A 50,000 kg locomotive is traveling at 10 m/s when its engine and brakes both fail. How far will the locomotive roll before it comes to a stop? Assume the track is level.

A rectangular loop of wire with sides 0.262 and 0.401 m lies in a plane perpendicular to a constant magnetic field (see part a of the drawing). The magnetic field has a magnitude of 0.