A rock is dropped from a window 5 m above the ground. the rock hits the ground 1 s later with a speed of 10 m/s. what is the average speed of the rock during this time

If a toy car is on a ramp where does the car have the most and least amount of kinetic energy?

A particular lever can lift a load with 80 percent efficiency. If 40 N of effort is applied 2.5 meters from the fulcrum, then what is the maximum load that can be lifted 1.5 m from the fulcrum? A) 5333 N B) 1920 N C) 66.7 N D) 53.3 N

A longitudinal wave moves energy that is to the direction of the wave's movement.

If the energy in a wave increases or decreases what is going to increase or decrease

On a brisk walk, a person burns about 331 Cal/h. If the brisk walk were done at 3.0 mi/h, how far would a person have to walk to burn off 1 lb of body fat? (A pound of body fat stores an amount of chemical energy equivalent to 3,500 Cal.) mi?

Objects become electrically charged as a result of the transfer of

How many electrons do most atoms seek to have on their valence shell? Using this information, explain why certain elements are unreactive and why other elements are reactive.

Which of the following statements is good advice to prevent becoming overly emotional? A. There is no way to prevent becoming overly emotional. B.

An ant is on the pendulum bob of a clock. What would be its displacement in one time period?

Every charged particle in the universe is surrounded by its own? A. both an electric and gravitational field B. Gravitational field C. Charged field D. Electric field E. Both and electric and charged field