Minimal orbit speed about Earth is about 8 km/s. Minimal orbital speed for a satellite about the Moon would be
A) less than 8 km/s.
B) greater than 8 km/s.
C) about 8 km/s.
Answer: A
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Velocity Addition: Three spaceships A, B, and C are in motion as shown in the figure. The commander on ship B observes ship C approaching with a relative velocity of 0.82c. The commander also observes ship A, advancing in the rear, with a relative velocity of 0.50c. What is the speed of ship C as measured by the captain of ship A?
A. 0.94c B. 0.23c C. 2.2c D. 0.54c E. 1.3c
When a mixture of gases is placed in a container at a given temperature, the pressure in the container is equal to the sum of the pressures that the individual gases would exert if they separately occupied the entire container at the same temperature
. Given that air is basically a mixture of nitrogen, with a molecular weight of 28 g/mol, and oxygen, with a molecular weight of 32 g/mol, what must be the ratio of the mass of oxygen to the mass of nitrogen in air for air to have an effective molecular weight of 29? A) 8:21 B) 3:5 C) 5:7 D) 32:87 E) 3:7
A rectangular-shaped patio has a base length equal to (24.5 ± 0.2) m and a height equal to (9.3 ± 0.1) m. What is the area of the patio, including its uncertainty?
a. 228 ± 4 b. 228 ± 2 c. 228 ± 23 d. 228 ± 6
Which telescope will be launched into solar orbit and eventually replace observations made by the Hubble Space Telescope?
a. Hinode b. Kepler c. Chandra d. JWST e. Fermi