An airplane that flies at 100 km/h in a 100-km/h crosswind has a ground speed of
A) 0 km/h.
B) 100 km/h.
C) 141 km/h.
D) 200 km/h.
Answer: C
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A 75 g block is placed into oscillation of amplitude 22 cm as it hangs from a vertical spring. If it observed to have a maximum speed of 14 m/s as it travels through the equilibrium position, what is the spring constant?
A. 300 N/m B. 22 N/m C. 4.8 N/m D. 1200 N/m
Six trillion miles is equivalent in distance to one ______________
a. light-year b. astronomical unit c. parsec d. billion meters
Coal, gas, and oil are ______________ fuels
a. fossil b. renewable c. human-made d. infinite
Why does a particular gas cloud in the constellation Orion appear red?
A) The atoms in the cloud have electrons that are primarily red. B) The cloud must be made up of neon and nothing else. C) The cloud must be made of some element or elements that give off red emission lines. D) The solid metal inside the cloud is heated to 1000 Kelvin. E) The gas in the cloud is emitting all colors, but our telescopes only detect red light.