An huge bear and a leaf fall from a tree through the air to the ground below. The force of air resistance is greater on the
A) bear.
B) leaf.
C) same on each
Answer: A
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In a solid, the average kinetic energy is equal to the average _____________energy.
Fill in the blank(s) with the appropriate word(s).
Electron Speed: Given that the speed of an electron in the ground state of hydrogen is 2190 km/s, what is the speed of an electron in the n = 4 orbit of hydrogen?
A. 547 km/s B. 31,000 km/s C. 139 km/s D. 178 km/s E. 2180 km/s
A car is able to stop in a distance d. Assuming the same braking force, what distance does this car require to stop when it is traveling twice as fast?
A) d B) 2 d C) d D) 4 d E) 2 d
If the length and diameter of a wire of circular cross section are both tripled, the resistance will be
A) unchanged. B) increased by a factor of 9. C) 1/3 of what it originally was. D) 1/9 of what it originally was. E) tripled.