A wheel on an axle or shaft that is designed to

support movement and change of direction of a

taut cable or belt, or transfer of power between

the shaft and cable or belt.

Why do many species that existed 35 million years ago no longer exist

A girl pushes a 60-kilogram box for a distance of 3 meters with a force of 4 Newtons into seconds. What is the power of the girl

What is heat? A. A measure of the movement of molecules inside an object B. The transfer of energy from a hot object to a cold object C. The force exerted on an area by an object D. A measure of mass per unit volume of an object

You and a friend are jumping on a trampoline. Why does Earth, which is rapidly orbiting around the sun, not move under your feet when you jump? A.

Describe how the current amplitude varies as the angular frequency of the source is slowly reduced from 1000 to 500. a-Amplitude is always constant. b-Amplitude decreases. c-Amplitude increases. d-First amplitude increases next it decreases.

When the atom's electrons step down to lower energy levels in a thin cloud of hot gas, what is produced?

Which is the relationship between algae and fungus? Options: Parasitism. Commensalism. Mutualism.

Photosynthesis is an endothermic chemical reaction that forms sugars from carbon dioxide, water, and the sun's energy. Which of the following must be true of photosynthesis?

What is a calorimeter used to measure?

When the mover pushes the box, two equal forces result. Explain why the box moves