Suppose the gravitational force between two spheres is 100 N. If the distance between the spheres is halved, what is the new gravitational force between them?

Why is perpetual energy possible?

What does the atomic number tell us about an atom of a certain element?

A current of 250 amps is flowing through a copper wire with a resistance of 2.09 x 10^-4 ohms. What is the voltage?

Planet z-34 has a mass equal to one-third that of earth and a radius equal to one-third that of earth. with g representing, as usual, the acceleration due to gravity on the surface of earth, the acceleration due to gravity on the surface of z-34 is

You are on top of a building that is 75.0 m tall. You toss a ball straight up with an initial velocity of 33.8 m/s. It goes up and then falls down to the ground below. How much time is it in the air?

an electric clothes dryer has a resictance of 16 Ohms it drawes 15 A of current what is the voltage in volts of the wall outlet that it is pluged into

A lorry with a mass of 5000kg accelerates to overtake a caravan on the motorway. Its acceleration is 1.5m/s². What force must the engine be providing? You can ignore the effects of friction and air resistance

Norma kicks a soccer ball with an initial velocity of 10.0 meters per second at an angle of 30.0% if the ball moves though the air for 3.2 seconds what's the horizontal distance traveled by the ball

Suppose s (t) is the position of an object moving along a line at time t is greater than or equal to 0. What is the average velocity between the times t=a and t=b? What is the instantaneous velocity at t=a?

Estimate how long it would take one person to mow a football field using an ordinary home lawn mower. suppose that the mower moves with a 1-km/h speed, has a 0.5-m width, and a field is 360 ft long and 160 ft wide. 1 m = 3.281 ft.