How do simple machines make work easier?

A. They add energy to the work.

B. They increase the force needed to work.

C. They reduce the speed of work.

D. They increase the distance over which a force is applied.

Ellen needs to move a heavy box across the floor and then place it on a shelf that is four feet above the floor.

A student blows up a balloon and then places it in a very cold freezer. After a few hours, the balloon has shrunk. Which of the following best explains why the balloon shrunk? A.

Is adding sugar to lemonade a chemical or physical change

A group of barbarians are trying to turn a large wheel and axle to grind grain. What can they do to move the wheel with less effort?

During constructive interference, two waves moving through the same medium willAnswer not occupy the same space amplify each other move around each other cancel each other out

A person performs 300 j of work over the course of 60 seconds how much power they did required

If you have a 90 V power source with a 30-Ω and 60-Ω resistor in series, what is the voltage drop over the 60-Ω resistor? 30 V 2 V 60 V 90 V

How is thermal energy transferred during convection?

What is the purpose of a free body diagram? A. to show the velocity of an object B. to show the acceleration of an object C. to show the forces acting on an object D. to show the direction of motion vectors of an object

An initially uncharged air-filled capacitor is connected to a 5.83 V charging source. As a result, 3.41*10-5 C of charge is transferred from one of the capacitor's plates to the other.