A 50 kg student climbs 3m to the top of a set of stairs. Calculate the change in the student's gravitational potential energy from the bottom to the top of the stairs.

A force of 60. newtons is applied to a rope to pull a sled across a horizontal surface at a constant velocity. the rope is at an angle of 30. degrees above the horizontal. determine the magnitude of the frictional force acting on the sled. [1]

Which port is used to transmit slow data over long distances?

You notice the flagpole at school vibrating in the breeze. You count the vibrations and find that the flagpole makes 20 complete vibrations in 10 seconds. You read somewhere that this flagpole vibrates at a speed of 25 m/s when the wind is blowing.

What are two dimensions of development? For each, give an example of how they can overlap

Halley's comet moves about the Sun in an elliptical orbit, with its closest approach to the Sun being 0.586 A. U. and its greatest distance from the Sun being 35.5 A. U. (1 A. U. = the Earth-Sun distance).

Physical Properties include ... A. taste, odor, and is corrosive B. taste, texture, and forms hydrogen gas. C. taste, odor, and texture D. texture, odor, and is corrosive

If a refrigerator is a heat pump that follows the first law of thermodynamics, how much heat was removed from food inside of the refrigerator if it released 441J of energy to the room?

What is the difference between convex and concave mirrors and lens?

Which is the best example of Newton's Second Law of Motion? A student has on roller skates and he decides to push against the railing. He immediately begins to roll backwards. A small ball and a larger ball with greater mass are dropped from a roof.

Which of the following represents a car traveling 20 miles/hour? 40 miles traveled in 2 hours 60 miles traveled in 6 hours 40 miles traveled in 3 hours 10 miles traveled in 5 hours