A boulder released by a rockslide rolls 60 m in 4 s. What is its average speed?

Car a is traveling at a constant speed 90 m/s east. a second car b is initially at rest when car a passes it at t=0.

Why do you keep your legs far apart when you have to stand in the aisle of a bumpy-riding bus?

How has the concept of a "planet" changed since the 16th century before the invention of the telescope? Do you think this shows scientific accuracy or disproves future facts, as one assumes that they will be discredited in time too?

Which 3 components must be used in order for a light bulb to light? a. Battery b. Fuse c. Light Bulb d. Switch e. Wire

The state of matter in which particles move most rapidly is

How is mechanical energy calculated? A. by adding potential energy and kinetic energy B. Oby subtracting potential energy from kinetic energy C. by multiplying potential energy and kinetic energy D. by dividing potential energy by kinetic energy

The voltage (or electric potential) of battery determines a. how much net electric charge is in the battery b. how much work the battery can do on an electric charge c. how much electric field is around

The net force on a 3.2kg toy airplane is 7N. What is the accelerator of the airplane?

A person, with a mass of 50.0 kg, stands on a weighing scale in a lift which is moving upwards with a uniform acceleration of 5.0 m/s 2 . What would be the reading on the scale? (A) 490 N (B) 250 N (C) 740 N (D) 240 N

A student analyzes data of the motion of a planet as it orbits a star that is in deep space. The orbit of the planet is considered to be stable and does not change over time. What can the student say about this initial observation?