A vertically oriented rocket that is able to sustain a continuous upward velocity of 8 km/s will
A) eventually escape from Earth.
B) be unable to escape Earth.
C) maintain a fixed orbit around Earth.
Answer: A
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Which of the following could be a stable planetary orbit in a binary system?
A) a large orbit around both stars in a wide binary system B) an orbit close to one of the stars in a wide binary system C) a "figure-of-eight" orbit about both stars in a close binary system D) an orbit close to one of the stars in a close binary system
A fire engine approaches a wall at 5 m/s while the siren emits a tone of 500-Hz frequency. At the time, the speed of sound in air is 340 m/s. How many beats per second do the people on the fire engine hear?
A. 0 B. 15 C. 29 D. 63 E. 250
What is the net force inward acting on a spherical bathysphere of diameter 2.00 m at an ocean depth of 1 000 m? (The pressure inside the bathysphere is, hopefully, 1 ATM.) r(sea water) = 1.02 × 10^3 kg/m3
a. 1.26 × 10^4 N b. 1.26 × 10^6 N c. 1.26 × 10^8 N d. 1.26 × 10^10 N e. 1.26 × 10^2 N
The radiation given off by the nucleus of an atom is called
a. a microwave. b. a gamma ray. c. an X-ray. d. any of these.