A person sits on a freely spinning lab stool that has no friction in its axle. When this person extends her arms,
A) her moment of inertia decreases and her angular speed increases.
B) her moment of inertia decreases and her angular speed decreases.
C) her moment of inertia increases and her angular speed increases.
D) her moment of inertia increases and her angular speed decreases.
E) her moment of inertia increases and her angular speed remains the same.
D
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Minimal orbital speed about Earth is about 8 km/s, and about the Moon is
A) less than 8 km/s. B) more than 8 km/s. C) about 8 km/s.
Ideal Gas Law: A 5.3 L flask of ideal neon gas (which is monatomic) is at a pressure of 6.0 atm and a temperature of 290 K. The atomic mass of neon is 20.2 g/mol. What is the mass of the neon gas in the flask. (R = 8.31 J/mol ? K, 1 atm = 101 kPa, NA = 6.022 × 1023 molecules/mol)
A. 2.7 × 10-2 B. 1.6 × 10-2 C. 1.3 × 101 D. 2.7 × 101 E. 2.7 × 103
A charged particle of mass 0.0020 kg is subjected to a 6.0 T magnetic field which acts at a right angle to its motion. If the particle moves in a circle of radius 0.20 m at a speed of 5.0 m/s, what is the magnitude of the charge on the particle?
A) 0.0083 C B) 120 C C) 0.00040 C D) 2500 C
According to Einstein, increasing the brightness of a beam of light without changing its color will increase:
a. the frequency of the photons. c. the speed of the photons. b. the energy of each photon. d. the number of photons.