Why does sandpaper get hot when it is rubbed against rusty metal?

A mountain climber of mass 60.0 kg slips and falls a distance of 4.00 m, at which time he reaches the end of his elastic safety rope. The rope then stretches an additional 2.00 m before the climber comes to rest.

What is the magnetic force acting on an electron if its speed is 3.0 * 106 meters/second and the direction is perpendicular to a magnetic field of 0.020 teslas? The value of q = - 1.6 * 10-19 coulombs.

Which of the following is a unit of speed? A) h B) nm C) cm/y D) km/s^2

Current enters a circuit at a: 1. positive terminal 2. negative terminal 3. low potential side 4. resistor

14 during which phase of the moon can a solar eclipse occur? a. new moon b. full moon c. third quarter d. first quarter

On october 15, 2001, a planet was discovered orbiting around the star hd 68988. its orbital distance was measured to be 10.5 million kilometers from the center of the star, and its orbital period was estimated at 6.3 days.

A container of rocks with a mass of 65.0 kilograms is brought back from the moon's surface where the acceleration due to gravity is 1.62 meters per second2. what is the weight of the container of rocks on earth's surface?

A curved, transparent object used to refract light

Describe how two plates move in relation to each other along divergent plate boundaries?

Question 6 As main sequence stars age, their temperature becomes cooler. O True O False