An electromagnet is ___

a. a permanent magnet

b. made with bar magnets

c. attracts all metal substances

d. only operating when the current is on

About when was the sail developed, making travel possible on the open water?

A closed loop conductor that forms a circle with a radius of is located in a uniform but changing magnetic field.

Two technicians are discussing electronic leveling systems. Technician A says that a weight should be placed in the vehicle as part of the diagnostic procedure. Technician B says that many ride height sensors are adjustable.

There is a force between two charges; if the distance between the two charges is doubled, by what factor does the force between them change?

To demonstrate refraction, Emily's teacher places a glass rod in water. The glass in the water will appear

How do we use light in space?

What units are used for gravitational potential energy? Write the name, not the symbol.

A 7.5 kg block is placed on a table. If it's bottom surface area is 0.6m2, how much pressure does the block exert on the tabletop? A. 376.5 Pa B. 73.5 Pa C. 226.5 Pa D. 122.5 Pa

A boulder of mass 2000 kg is at the top of a cliff of height 220 m. Determine how fast the boulder will be moving when it strikes the dirt below.

Which of the following statements are true? Check all that apply. O A positive charge and a negative charge attract each other. O Electric charge is conserved. O Two positive charges attract each other. O A neutral object contains no charge.