When a ball increases in speed by the same amount each second, its acceleration
A) also increases each second.
B) decreases each second.
C) is constant.
D) varies.
Answer: C
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In contradiction to the teachings of Aristotle, Galileo found that an object with no forces (and no friction) acting on it will ____
a. move faster and faster b. eventually stop moving c. move at a constant speed forever d. first increase and then decrease in speed e. first decrease and then increase in speed
A parallel plate capacitor with plate separation of 4.0 cm has a plate area of 4.0 × 10-2 m2. What is the capacitance of this capacitor with air between these plates?
A) 8.9 × 10-11 F B) 8.9 × 10-12 F C) 8.9 × 10-13 F D) 8.9 × 10-14 F E) 8.9 × 10-15 F
A 30-kg child rides on a circus Ferris wheel that takes her around a vertical circular path with a radius of 20 m every 22 s. What is the magnitude of the resultant force on the child at the highest point on this trajectory?
a. 49 N b. 0.29 kN c. 0.34 kN d. 0.25 kN e. 0.76 kN
Hurricanes derive their energy from
a. gravity. b. specific heat. c. the Coriolis force. d. latent heat.