Which of the following types of units is based on the metric system in the United States?

the mile

the ounce

the dollar

the pound

A child throws a steel ball straight up. consider the motion of the ball after it has left the child's hand but before it touches the ground, and assume that forces exerted by the air are negligible.

Mischka is an amateur astronomer. Using her telescope, she looks out past the Earth's atmosphere and observes an object with a long, bright, cloud-like tail behind it. What is Mischka observing? an asteroid a meteorite a comet a meteoroid

An older-model car accelerates from 0 to speed v in 9.0 s. A newer, more powerful sports car of the same mass accelerates from 0 to 3v in the same time period.

Obsidian is a volcanic glass that forms when lava cools very quickly and consists of a solid mass of glass through and through. Why is obsidian not classified as a mineral?

Is energy absorbed or given off when an electron and a hole of a semi-conductor crystal recombine? What are the forms of energy that can be absorbed or given off?

If you put in 10 J of work to push 1 c of charge against and electric field what will be its voltage with respect to its starting position? when released, what will be it's kinetic energy if it flies past it's starting position?

The process of changing the energy of a system by means of force. Force * Diatance

A gnat takes off from one end of a pencil and flies around erratically for 18.6 seconds before landing on the other end of the same pencil. If the gnat flew a total distance of 7.15 meters, and the pencil is 6.

An apple falls from an apple tree growing on a 20° slope. the apple hits the ground with an impact velocity of 16.5 m/s straight downward. what is the component of the apple's impact velocity parallel to the surface of the slope?

Objects falling through the air experience a type of friction called air resistance. true or false