What does Astronomy mean?

Which simple machine is NOT correctly matched with an appropriate task for its use? a lever: Removing a nail from a board an inclined plane: Moving a heavy box up to the second floor of a building.

Which will produce a bigger acceleration: a force of 10.0 N acting on a mass of 5.0 kg, or a force of 5.0 N acting on a mass of 10.0 kg?

How does the valence of the element relate to its chemical activity?

A roundtrip to Mars is expected to take up to 2 years and this would be dangerous to human health. true or false

A doppler effect occurs when a source of sound moves. True or False

A refrigerator is a system. The energy input into the refrigerator system (in the form of electricity) is the same as the amount of energy output from the system. Which of the following best describes the energy output of the system?

A 1,120 kg car is travelling with a speed of 40 m/s. Find its energy.

3. Calculate the amount of current through a 45-watt light bulb that is connected to a 120-volt circuit in your home.

Are oranges called oranges because oranges are orange, or is orange called orange because oranges are orange?

An object at rest has no net force acting on it. a. True b. False