If the lights are off in a room and there are no windows, why do most objects appear black?

How does a green leaf appear in the red light? Use what you know about reflection and absorption of light. A. black B. Green C. Greenish-red D. Red E. White

A ball is dropped from the top of a cliff 651 m high. How long does it take the ball to hit the ground at the bottom of the cliff, in seconds?

Which of the following are major problems with fission reactors? maintaining high temperatures disposal of hot water disposing of radioactive waste obtaining fuel

If a carbon atom was broken in half, would it still be carbon?

Which portion of the electromagnetic spectrum is used to sterilize medical instruments? a. microwaves b. visible light c. ultraviolet light d. radio waves e. infrared waves?

A 25kg object moves from left to right at a speed of 30km/h. What net force is required to keep this object moving in a straight line at constant speed

Ganymede is one of the many moons of jupiter. it is nearly a sperical in shape. it is larger than the planet mercury and slightly smaller than the planet mars.

Which of the following statements about two carts rolling on a track and experiencing a completely inelastic collision is TRUE? a. The kinetic energy of the system is conserved to good approximation. b.

If element X has 17 protons, how many electrons does it have?

A 2.0-kilogram laboratory cart is sliding across a horizontal frictionless surface at a constant velocity of 4.0 meters per second east. What will be the cart's velocity after a 6.0-newton westward force acts on it for 2.