What does a simple pulley do?

A. It makes you have to pull harder on the rope.

B. It increases the force.

O O O O

C. It redirects the force.

D. It makes the load heavier.

Describe a device that transforms thermal energy into another useful form

Heavy rains in late July 2010 triggered the mass wasting that occurred in this mountain valley near Durango, Colorado. Heavy equipment is clearing away material that blocked railroad tracks and significantly narrowed the stream channel.

What types of waves make up the electromagnetic spectrum?

Electromagnetic waves can transfer energy without which of the following? A. Medium. B. Electric field. C. Magnetic field. D. Change in either a magnetic or an electric field.

The astronomer who was imprisoned by the church for announcing his scientific discovery was

A swimming pool has the dimensions of 10 meters, 5 meters, and 1 meter. What is the pool's volume? 50 m 50 m3 50 m2 25 m3

A child pushes horizontally on a box of mass m which moves with constant speed v across a horizontal floor. The coefficient of friction between the box and the floor is μ. At what rate does the child do work on the box?

What two qauntities must be known to calculate the density of a sample of matter

An element's atomic number is 38. How many protons would an atom of this element have?

What's are some forms of chemical energy