A copper penny has a mass of 3.1 g and a volume of 0.35 cm3. What is the density of copper? Be sure to show your work and include units.

When an electric current flows through a long conductor, each free electron moves a. through a relatively short distance. b. from one end of the conductor to the other end. c. back and forth between the ends of the conductor. d.

Alice builds an electric motor by positioning an electromagnet between the poles of a permanent magnet. When the electromagnet turns, the current through it switches direction because its connections to the voltage source are reversed.

Why does an object have a different weight on the moon than it does on Earth A. objects move slowly on the moon b. the Earth and the moon have different values for acceleration due to gravity C. everything is weightless in space D.

The weight of a body above the surface of the Earth is inversely proportional to the square of its distance from the center of the Earth. What is the effect on the weight when the distance is multiplied by 2 ? A. The weight is multiplied by 4. B.

What do a broken rode and a volcano eruption have in common

A proton has an initial speed of 3.7*10^5 m/s. a) What potential difference is required to bring the proton to rest? (V) b) What potential difference is required to reduce the initial speed of the proton by a factor of 2?

If a ball is dropped from rest from an elevated position at the same instant that a second ball is launched horizontally (from the same height), then which ball will hit the ground first? Assume the balls behave as projectiles

What are 5 Non-Examples of Density

With the switch closed, how does the voltage across the 20-ω resistor compare to the voltage across the 10-ω resistor?

A 5.90-g lead bullet traveling at 410 m/s is stopped by a large tree. If half the kinetic energy of the bullet is transformed into internal energy and remains with the bullet while the other half is transmitted to the tree, what is the increase in