A good ammeter has ________ resistance and a good voltmeter has ________ resistance. "Good" means that it affects the system being measured by very little.
A. low, low
B. low, high
C. high, high
D. high, low
E. medium, no
B. low, high
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Saturn radiates 1.8 times as much energy as it receives from the Sun
a. True b. False Indicate whether the statement is true or false
All the following statements are true. Which one explains why our calendar has leap years?
A) Earth's axis precesses with a period of about 26,000 years. B) There is a difference between a sidereal year and a tropical year. C) A tropical year is slightly more than 365 days. D) Earth's speed varies as it orbits the Sun.
A catapult fires an 800-kg rock with an initial velocity of 100 m/s at a 40° angle to the ground. The magnitude of the vertical impulse the catapult receives from the rock is
a. 5.1 × 10^4 N s. b. 6.1 × 10^4 N s. c. 8.0 × 10^4 N s. d. 5.0 × 10^5 N s. e. 6.0 × 10^5 N s.
Why can we not see as many craters on Earth as on the Moon?
What will be an ideal response?