A steel cable spanning a river is 200.000 m long when the temperature is 20.°C. What will be its length when the temperature drops to 0°C? (The coefficient of thermal expansion of steel is 12. × 10-6K-1.)
What will be an ideal response?
199.952 m
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Spherical Mirrors: A toy is 14 cm in front of a convex spherical mirror. If the image of the toy is 5.8 cm behind the mirror, what is the focal length of the mirror?
A. -4.1 cm B. +20 cm C. -9.9 cm D. -20 cm E. +9.9 cm
The most powerful agent of erosion is
A) stream flow. B) glacial action. C) action from waves and ocean currents. D) wind.
Which of the following statements about the rings of the four jovian planets is not true?
A) All rings lie within their planet's Roche zone. B) All the particle orbits are fairly circular, near their planet's equatorial plane. C) All have gaps and ringlets, probably due to gap moons, shepherd moons, and orbital resonances. D) All probably look much like they did when the solar system first formed. E) All are made of individual particles of rock or ice that orbit in accord with Kepler's laws: inner ring particles orbiting faster, and outer ring particles orbiting slower.
Projectile Motion: A ball is thrown with an initial velocity of 20 m/s at an angle of 60° above the horizontal. If we can neglect air resistance, what is the horizontal component of its instantaneous velocity at the exact top of its trajectory?
A. 10 m/s B. 17 m/s C. 20 m/s D. zero