A car heading north suddenly collides at an intersection with a truck of the same mass heading east. If they lock together and travel at at 15° north of east just after the collision, how fast was the car initially traveling?
A) 14 m/s
B) 7 m/s
C) 28 m/s
D) 11 m/s
A
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Stars that have masses similar to the Sun's, and sizes similar to the Earth are:
A) main sequence stars. B) white dwarfs. C) red giants. D) red dwarfs. E) brown dwarfs.
The loudness of a sound is most closely related to its
A) speed. B) frequency. C) wavelength. D) intensity.
When the temperature of the air in a balloon is raised, the volume of the balloon
A. increases. B. decreases. C. stays the same.
The Tonga Trench in the Pacific Ocean is 36,000 feet deep. Assuming that sea water has an average density of 1.04 g/cm3, calculate the absolute (total) pressure at the bottom of the trench in atmospheres. (1.00 in = 2.54 cm, 1.00 atm = 1
01 × 105 Pa) A) 1.1 × 106 atm B) 1.1 × 105 atm C) 2.1 atm D) 1.1 × 108 atm E) 1.1 × 103 atm