You throw a ball straight up into the air. In addition to gravity, the ball feels a force due to air resistance. Compared to the time it takes the ball to go up, the time it takes to come back down is:
a) smaller
b) the same
c) greater
Ans: c) greater
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If the position of an electron (m = 9.11 × 10^-31 kg) could be measured to within 10-30 m, the uncertainty in the magnitude of its speed could be as much as
a. 6 × 10^-34 m/s. b. 6 × 10^25 m/s. c. 6 × 10^30 m/s. d. 1031 m/s. e. 1061 m/s.
According to Kepler's third law, the square of the planet's period in years is
A) equal to its perihelion distance from the Sun in AU. B) inversely proportional to its mass in kilograms. C) equal to the fourth power of its average temperature in degrees Kelvin. D) proportional to the cube of its semimajor axis in AU. E) equal to the square of its aphelion distance in AU.
Two blocks with mass m2 > m1 are pulled as shown along horizontal surfaces, each at a constant speed v. Which tension force does more work moving the block a distance D along the surface?
The skinny tires of a 10-speed racing bicycle require more air pressure than the fat tires on an equally massive mountain bike because
A. the racing bike exerts more force on the ground. B. the area of contact of the racing bike's tires is greater than that of the bike with fat tires. C. the racing bike touches the ground over a smaller area than the bike with fat tires. D. the racing bike moves faster.