What is the total mass of the Earth's atmosphere? The radius of the Earth is 6.4 × 10^6 m, and 1 atm = 1.01 × 10^5 N/m2
a. 5.3 × 10^16 kg
b. 1.1 × 10^18 kg
c. 5.3 × 10^18 kg
d. 1.1 × 10^20 kg
e. 5.3 × 10^9 kg
c
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Water (density = 1.00 × 10^3 kg/m3) flows at 15.0 m/s through a pipe with radius 0.0400 m. The pipe goes up to the second floor of the building, 2.50 m higher, and the pressure remains unchanged. What is the speed of the water flow in the pipe on the second floor?
a. 13.3 m/s b. 16.6 m/s c. 176 m/s d. 14.2 m/s e. 6.63 m/s
X-rays from the Sun's corona
A) are absorbed in Earth's troposphere. B) are absorbed in Earth's thermosphere. C) cause meteor showers. D) break apart ozone in the stratosphere. E) generally reach Earth's surface and fry us.
A simple pendulum, 2.0 m in length, is released by a push when the support string is at an angle of 25° from the vertical. If the initial speed of the suspended mass is 3.0 m/s when at the release point, to what maximum angle will it move in the second half of its swing?
a. 36° c. 19° b. 30° d. 47°
Two small charged objects repel each other with a force F when separated by a distance d. If the charge on each object is reduced to one-fourth of its original value and the distance between them is reduced to d/2 the force becomes:
A) F/16 B) F/8 C) F/4 D) F/2 E) F