Do true blackbodies exist in nature?

Yes or No?

You're conducting a physics experiment on another planet. You drop a rock from a height of 2.1 m and it hits the ground 0.6 seconds later. What is the acceleration due to gravity on this planet? A. 7.0 m/s2 B. 9.8 m/s2 C. 11.7 m/s2 D. 5.

How much horsepower is needed to move a box that has a force of 1,492 n a distance of 2 meters in 1 second?

Object B is at rest when object A collides with it. The collision is one-dimensional and elastic. After the collision object B has half the velocity that object A had before the collision. Which object has the greater mass?

A coil of wire is comprised of 5 turns, has a current of 2 mA running through it, and a net magnetic field at its center of B is equal to start fraction mu naught over 40 end fraction times T. What is the radius of the coil of wire?

How many moles of gas must be forced into a 4.6 l tire to give it a gauge pressure of 31.2 psi at 26 âc? the gauge pressure is relative to atmospheric pressure. assume that atmospheric pressure is 14.

A book rests on a table, exerting a downward force on the table. the reaction to this force is:

Steve hears a siren emitting a frequency of 10 kHz when it is at rest. What frequency will Steve hear if the siren moves toward him at 30 m/s? Assume the speed of sound is 340 m/s. Answer options are: a. 11 kHz b. 10 kHz c. 0 kHz d. 9 kHz

What is the efficiency of a machine that has work input of 40 joules and work output of 35 joules

What happens to an object if the forces acting on it are unbalanced?

A 92-kg astronaut and a 2000-kg satellite are at rest relative to a space station. the astronaut pushes on the satellite, giving it a speed of 0.14 m/s directly away from the station.