Why is it impossible to build a machine that produces more energy than it uses?

Which instrument would play lower tones? a) An upright base (6 ft long) b) A violin (2 ft long)

Which of the following is considered a contact forces?1) the force between two magnets. 2) the gravitational pull of a planet. 3) friction between an object and air. 4) the force between two charged particles.

Why must you use temperature to specify how hot or cold something is?

Two football players with mass 75kg and 100kg run directly toward each other with speeds of 6 m/s and 8 m/s respectively, If they grab each other as they collide, the combined speed of the two players just after the collision would be:

A 5.0 kg bucket of water is raised from a well by a rope. If the upward acceleration of the bucket is 3.0 m/s2, find the tension exerted by the rope. A. 5.0 x 9.8 NB. (5.0 x 9.8) - (5.0 x 3.0) NC. 5.0 ND. (5.0 x 9.8) + (5.0 x 3.0) N

This is the body of law that codifies what a state defines as legal and/or illegal as well as the punishments for the violations of the laws.

Five workers from the same factory developed angiosarcoma, a rare cancer of the veins and arteries. Which part of the scientific method is this? Group of answer choices conclusion experiment observation none of these hypothesis

Fill in the word that completes each statement. Current cannot flow through a circuit when the switch is Current flows through a circuit and all of the bulbs are lit only when the switch is

Metallic bonds are important to how paperclips are both made and used

A motorbike travels 45 miles in 15 minutes what is its speed