If you double the length of each side of a cube, its volume increases by what factor?
A. 2
B. 4
C. 6
D. 8
Answer: D. 8
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Which of the following is not consistent with recent observations of the cosmic microwave background by Planckt?
A) The universe is geometrically "flat" (in the four dimensions of spacetime). B) The matter density (both luminous and dark matter combined) in the universe is only about one-fourth of the critical density. C) Dark energy, whatever it is, represents the majority of the energy content of the universe. D) The universe is at least 20 billion years old.
A 1.5-kg object moving along the x axis has a velocity of +4.0 m/s at x = 0. If the only force acting on this object is shown in the figure, what is the kinetic energy of the object at x = +3.0 m?
A. 18 J B. 21 J C. 23 J D. 26 J E. 8 J
A parallel plate capacitor has a potential difference between the plates of 80 V. If the charge on one of the plates of the capacitor is +8.0 ?C, what is the electrical energy stored by this capacitor?
A) 640 × 10-6 J B) 320 × 10-6 J C) 5.0 × 10-8 J D) 6.0 × 10-8 J E) 3.0 × 10-8 J
On planet X, the absolute pressure at a depth of 2.00 m below the surface of a liquid nitrogen lake is 5.00 × 105 N/m2
At a depth 5.00 m below the surface, the absolute pressure is 8.00 × 105 N/m2. The density of liquid nitrogen is 808 kg/m3. (a) What is the atmospheric pressure on planet X? (b) What is the acceleration due to gravity on planet X?