If the efficiency of a lever is 30% and 560 J is used to move the lever, what is the work output?

A) 18.7J

B) 168 J

C) 1,867 J

D) 16,800 J

Two objects were lifted by a machine. one object had a mass of 2 kilograms, and was lifted at a speed of 2m/sec. the other had a mass of 4 kilograms and was lifted at a rate of 3 m/sec. which object had more kinetic energy while it was being lifted?

A car slams on its breaks, producing friction between the tires and the road. Into which type of energy is the mechanical energy of the car converted?

Mark puts an object that has a mass of 58.2 kg in a cart that has a mass of 73.00 kg. How should Mark report the total mass to the correct number of significant figures? 131 kg, to have the same number of significant figures as 58.2 kg 131.

Which is a property of every homogeneous mixture?

A runner increases her speed from 8.9 m/s to 18.3 m/s in 8 seconds. What is the acceleration of the runner

Which is not a property of an electromagnetic wave? O It is made of magnetic fields It travels at the speed of light O It is made of electrical fields It carries energy only through matter

Explain why your weight would be less in the moon than on earth even though your mass would not change. Use the law of universal gravitation in your explanation.

ions are atoms or groups of atoms that have a positive or negative charge. which of the following statements is true of ions?

1. According to the nebular theory, the solar system formed from? A. accretion of protoplanets. B. a large, thin cloud of dust and gas. C. colliding planetesimals. D. all of the above 2.

What is the difference between tangential acceleration and centripetal acceleration?