If you stand in front of a concave mirror, exactly at its focal point,
A) you won't see your image because there is none.
B) you will see your image, and you will appear smaller.
C) you will see your image at your same height.
D) you will see your image and you will appear larger.
E) you won't see your image because it's focused at a different distance.
A
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As space expands, everything in it is also getting bigger.
Answer the following statement true (T) or false (F)
As the temperature of the air increases, what happens to the velocity of sound? (Assume that all other factors remain constant.)
A) It increases. B) It decreases. C) It does not change. D) It increases when atmospheric pressure is high and decreases when the pressure is low.
Mass on a Spring: A 0.50-kg box is attached to an ideal spring of force constant (spring constant) 20 N/m on a horizontal, frictionless floor. The box oscillates in simple harmonic motion and has a speed of 1.5 m/s at the equilibrium position.(a) What is the amplitude of vibration?(b) At what distance from the equilibrium position are the kinetic energy and the potential energy the same?
What will be an ideal response?
Relative to a fossil-fuel plant, a nuclear power plant produces
A) more electricity. B) less heat and smoke. C) less pollution. D) all of the above E) none of the above