How much work is done when I apply 200 N of force to a brick wall

A girl with mass of 40 kg sits on a sled at rest with a man of 15 kg. What is the kinetic energy of the girl and sled together

What is the average mass of an electron? A. 1 amu B. 1,837 amu C. 1/1,837 amu

A turtle, moving at a constant velocity of 0.9 m/s due East, is in a race with a rabbit, who runs at a moderate speed of 9 m/s.

supposed to vacuum cleaner uses 120 J of electrical energy. If 45 J used to pull air into a vacuum cleaner, how efficient is the vacuum cleaner?

A 3.00-kg box is suspended from the end of a light vertical rope. A time-dependent force is applied to the upper end of the rope, and the box moves upward with a velocity magnitude that varies in time according to v (t) = (2.00m/s2) t + (0.

How do you describe the frequency of waves perceived by the observer from the moment the source appears to the moment it disappears?

What causes the stars to appear to move across the night sky?

Two waves collide and the temporary combined waves that results is smaller that the original wave. which term describes this interaction? A. destructive interference B. standing wave formation C. diffraction D. constructive interference

What do all types of waves on the electromagnetic spectrum have in common

If the force applied to an object increases while the mass stays the same, the acceleration of the object.