Find the average density of a white dwarf star if it has a mass equal to that of the Sun (2.0 × 1030 kg) and a radius equal to that of the Earth (6.4 × 106 m).
A. 9.0 × 106 kg/m3
B. 1.8 × 107 kg/m3
C. 1.8 × 109 kg/m3
D. 3.6 × 1010 kg/m3
E. 9.0 × 107 kg/m3
Answer: C
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A) hydrogen. B) oxygen. C) both the same D) not enough information
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
A 0.14-km wide river flows with a uniform speed of 4.0 m/s toward the east. It takes 20 s for a boat to cross the river to a point directly north of its departure point on the south bank. What is the speed of the boat relative to the water?
a. 5.7 m/s b. 8.5 m/s c. 8.1 m/s d. 7.0 m/s e. 6.4 m/s
If you somehow increased Earth's radius, without changing its mass, would this affect your weight?
A) Yes, your weight would increase. B) No, because your weight always remains the same regardless of how you change the external surroundings. C) No, because the force of gravity on your body depends only on your mass and on Earth's total mass--it doesn't depend on Earth's size. D) Yes, your weight would decrease.