Pressure: Calculate the pressure exerted on the ground due to the weight of a 79-kg person standing on one foot. if the bottom of the person's foot is 13 cm wide and 28 cm long.
A. 2.1 × 104 Pa
B. 2.2 × 103 Pa
C. 4.8 × 104 Pa
D. 5.3 × 104 Pa
Answer: A
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Parallel Wires: When two long parallel wires carry unequal currents, the magnitude of the magnetic force that one wire exerts on the other is F. If the current in both wires is now doubled, what is the magnitude of the new magnetic force on each wire?
A. 16F
B. 8F
C. 4F
D. 2F
E. F
What observational evidence supports the idea that Mercury once shrank by some 20 kilometers in radius?
A) the presence of many impact craters B) the characteristics of the Caloris Basin C) Mercury's unusually high density D) the presence of many long, tall cliffs
Newton's Second Law of Motion tells us that the net force applied to an object equals its
A) mass times acceleration. B) mass times energy. C) momentum times velocity. D) mass times velocity.
A paint pigment that absorbs red light and gives off blue light
A) is fluorescent. B) is phosphorescent. C) is used in lasers. D) is polarized. E) doesn't exist.