An astronaut is orbiting a black hole with a mass of 2.0 × 1031 kg at a distance of 126 km from its center. The astronaut is positioned in the spacecraft so that his 0.10-kg cheeks are 0.050 m on either side of the orbital circle
What is the net tidal force pulling his cheeks apart? G = 6.67 x 10-11 N•m2/kg2. A) 1,000 N
B) 2,000 N
C) 10,000 N
D) 20,000 N
E) 100,000 N
C
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A European sports car dealer claims that his product will accelerate at a constant rate from rest to a speed of 100 km/h in 6.00 s. What distance will the sports car travel during the 6.00-s acceleration period? (Hint: First convert speed to m/s.)
a. 41.7 m b. 58.3 m c. 83.3 m d. 167 m e. 125 m
A 1.0-C point charge is 15 m from a second point charge, and the electric force on one of them due to the other is 1.0 N. What is the magnitude of the second charge? (k = 1/4??0 = 8.99 × 109 N ? m2/C2)
A) 25 C B) 1.0 C C) 10 nC D) 0.025 C E) 25 nC
Blue light (l = 460 nm) is incident on a piece of potassium (W = 2.45 eV). What is the maximum kinetic energy of the ejected photoelectrons? (h = 6.63 × 10^-34 J×s, c = 3.00 × 10^8 m/s, 1 eV = 1.60 × 10^-19 J, and 1 nm = 10-9 m)
a. 1.0 eV c. 0.50 eV b. 0.25 eV d. 4.9 eV
The distance across the ocean over which a steady wind blows is the: