Hubble's "constant" is constant in
A) time.
B) space.
C) space and time.
D) our Galaxy but different in others.
B
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In Jules Verne's From the Earth to the Moon, scientists are launched from the surface of Earth by a cannon
With what speed would their capsule have to leave the cannon if the speed of the capsule is required to be zero m/s at the point between Earth and the Moon where their gravitational pulls on the capsule are equal? The mass of Earth is 5.97 × 1024 kg, the mass of the Moon is 7.35 × 1022 kg, the distance between Earth and the Moon is 3.84 × 108 m, the radius of Earth is 6.37 × 106 m, and G = 6.67 x 10-11 N•m2/kg2. A) 11,100 m/s B) 11,200 m/s C) 10,400 m/s D) 15,700 m/s E) 15,800 m/s
For a fluid having density of 682 kg/m^3 (42.6 lbm/ft^3), viscosity of 0.28 g/ms (1.88 x 10^-4 lbm/ft?s), and thermal conductivity of 0.562 W/mK (0.325 Btu/hr?ft?0F), what is its Reynolds number when flowing at 10 m/s (32.8 ft/s) through a 20 cm (7.87 in) diameter tube?
What will be an ideal response?
A fluid is flowing with an average speed of 1.5 m/s through a tube that has a radius of 2.0 mm and is 18 cm long. The drop in pressure is 967 Pa. What is the viscosity of the fluid?
A) 0.028 N ? s/m2 B) 0.0056 N ? s/m2 C) 0.013 N ? s/m2 D) 0.0034 N ? s/m2 E) 0.0018 N ? s/m2
Two masses m1 and m2, having m1 > m2, are launched with the same speed in the direction a. Which mass reaches the greatest height?