Which machine changes the direction of force needed to do a task without changing the size of the force needed?

A hot air balloon is filled with air through an opening the air is heated using a burner the hot air causes a pressure on the inside of the balloon use ideas about molecules to explain how the hot air causes this pressure

Forces of attraction between particles is the smallest in gas solid and liquid liquid solid

Explain why you move forward and a boat moves backwards when you jump from a boat to a pier

A small spotlight mounted in the bottom of a swimming pool that is 5.0 m deep emits light in all directions. On the surface of the pool, directly above the light, the area illuminated is a circle. Determine the maximum radius of this circle.

The steam engine in a train heats water until it becomes steam. The steam pushes pistons to move the train. The train is changing a. kinetic energy b. heat c. chemical energy into a. mechanical energy b. potential energy c. electricity?

What is a characteristic of nuclear fusion but not nuclear fission?

Starting at its rightmost position, it takes 2 seconds for the pendulum of a grandfather clock to swing a horizontal distance of 18 inches from right to left and 2 seconds for the pendulum to swing back from left to right.

A child aims his air rifle at an angle of 10 degrees above the horizontal. he fires a bb while simultaneously dropping another b-b from rest, from the same height as the rifle barrel. which b-b will hit the ground first

Which of the following has a crystalline appearance? baking soda salt baking powder corn starch

What is the equivalent resistance of a circuit that contains two 50.0 resistors connected in parallel with a 12.0 V battery? A. 100.0 B. 25.0 C. 0.040 D. 0.48