A child is sledding. He starts at the top of the hill with a velocity of zero, and 3 seconds later he is speeding down the hill at 12 meters per second. What is the child's acceleration?

Which of the following describes sound waves? A. Mechanical waves in which the vibrations are perpendicular to the motion of the sound B. Electromagnetic waves in which the vibrations are parallel to the motion of the sound C.

Explain why it may make more sense to colonize on Venus, rather than Mars. Given all the positive characteristics of Venus, why has space exploration focused so much on Mars

Suppose you are driving in a car. A truck drives past you, traveling in the same direction you are driving. Which statement best describes how the truck's motion will appear to you? A.

Why does green light has a lower frequency than blue color?

Remembering that Force = mass x acceleration. A Football player kicks a ball with a mass of 0.42 kg. The average acceleration of the football was 14.8 m/s^2. How much force did the kicker supply to the football? A) 35.24 m/s^2 B) 6.22 N C) 35.

Which of the following is a vector quantity? A. 83 ounces of liquid B. 55 km/hr in a truck C. 15 seconds of travel D. 10 m/s down

Which of the following best describes the ultraviolet catastrophe of blackbody radiation? A. As energy is added to an object acting as a blackbody radiator, its emissions move to the ultraviolet part of the electromagnetic spectrum. B.

Is an engine-activated booster unit that reduces the effort required to apply the hydraulic brakes

A box is lowered using a rope. If the acceleration of the box, is 2.5 m/s2 (downward) and the tension in the rope is 31 N, what is the mass of the box (in kg) ?

On a very hot summer day, the rooms on the first floor of a house stay cooler than the rooms on the second. Which form of thermal energy flow causes this to occur? A) Conduction B) Convection C) Kinetic D) Radiation