A heavy man and a light man parachute together from a high-flying plane. The first to attain zero acceleration will be the
1) light man
2) heavy man
3) both will attain zero acceleration at the same time.
because
4) the gravitational force on each man is the same.
5) of the lesser gravitational force acting on the lighter man.
6) air resistance will eventually counterbalance the weights of both men.
7) the lighter man will not have to fall for as long a time before air resistance equals his weight.
Answer: 1, 7
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In a contest, two tractors pull two identical blocks of stone the same distance over identical surfaces. However, block A is moving twice as fast as block B when it crosses the finish line. Which statement is correct?
A. Block A has twice as much kinetic energy as block B. B. Block B has lost twice as much kinetic energy to friction as block A. C. Block B has lost twice as much kinetic energy as block A. D. Both blocks have had equal losses of energy to friction. E. No energy is lost to friction because the ground has no displacement.
Vision Problems: If the lens in a person's eye is too highly curved, this person is suffering from
A. farsightedness. B. spherical aberration. C. astigmatism. D. chromatic aberration. E. nearsightedness.
In solving a physics problem you end up with m in the numerator and m/s in the denominator. The units for your answer are
A) m2/s. B) m2. C) m. D) s. E) 1/s.
A series circuit consists of a 100 V DC power source, a 100 ? resistor, and a variable resistor of resistance R, which varies from 0 to 100 ?. The current in the circuit is
a.
directly proportional to R.
b.
inversely proportional to R.
c.
directly proportional to (100 ? + R).
d.
inversely proportional to (100 ? + R).
e.
neither directly nor inversely proportional to R or to (100 ? + R).