A scientific theory can change if what?

A car of mass 2000 kg is thrusted forward with an engine force of 2000 N and a total frictional force of 1000 N, if the initial speed of the car is 25 m/s, calculate the speed of the car once it has moved 1000 m

A student pushes a 2.85 kg cart causing it to accelerate at a rate of 4.9 m/s squared. What amount of force must the student have used? (2 sig digs)

Describe at least two ways that gravitational and strong nuclear forces are alike and two ways that they are different.

When is the velocity of a mass on a spring at its maximum value? A. when the mass has an acceleration of zero B. when the mass is moving downward C. when the mass has maximum displacement D. when the mass is at rest

A piston has an external pressure of 15.0 atm. how much work has been done in joules if the cylinder goes from a volume of 0.150 liters to 0.640 liters?

At what height above earth's surface is the gravitational acceleration reduced from its sea-level value by 0.40%?

A rocket moves away from the surface of the earth. As the distance r from the center of the planet increases, what happens to the force of gravity on the rocket?

Why am i not floating?

A person holds onto an object for 2 minutes, but doesn't move the object. Is work done on the object?

Warming in front of a fire while camping is an example of? A. Conduction B. Convection C. Radiation