A mirror is rotated at an angle of 10° from its original position. How much is the rotation of the angle of reflection?
A) 10°
B) 5°
C) 15°
D) 20°
E) 40°
D
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A kid slides down an icy (frictionless) hill starting from rest. At the top his gravitational potential energy is 500 J. He slides part way down the hill to a point where his gravitational potential energy is 200 J. His kinetic energy at that point will be
a. 200 J b. 300 J c. some unknown value between 0 and 500 J d. none of the above
As you stand by the side of the road, a car approaches you at a constant speed, sounding its horn, and you hear a frequency of 80.0 Hz. After the car goes by, you hear a frequency of 60.0 Hz
What is the speed of the car? The speed of sound in the air is 343 m/s. A) 64.0 m/s B) 49.0 m/s C) 16.0 m/s D) 36.0 m/s E) 25.0 m/s
An object is placed 15. cm from a concave mirror of focal length 20. cm. If the object is 4.0 cm tall,
(a) where is the image formed? (b) how tall is it?
Heat a copper wire and its electrical resistance
A) decreases. B) remains unchanged. C) increases.