Hubble's constant is about 22 km/s/million light-years, implying an age of about 14 billion years for the universe. If Hubble's constant were 11 km/s/million light-years, the age of the universe would be about
A) 7 billion years.
B) 14 billion years.
C) 28 billion years.
D) Impossible to say, because Hubble's constant has no relationship to the age of the universe.
C
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Equilibrium: As shown in the figure, a 10.0 m long bar is attached by a frictionless hinge to a wall and held horizontal by a light rope that makes an angle ? = 49° with the bar. The bar is uniform and weighs 66.5 N. What distance x from the hinge should a 10.0 kg mass be suspended for the tension in the rope to be 177 N?
Fill in the blank(s) with the appropriate word(s).
The first of two identical boxes of mass m is sitting on level ground. The second box is sitting on a ramp that makes an angle with the ground. When a force of magnitude F is applied to each box in a direction parallel to the surface it is on, upwards on the box on the ramp, neither box moves. Which statement comparing the friction force on the box on the level, Fs,L, to the friction force on the box on the ramp, Fs,R, is correct?
A. Fs,R = Fs,L. B. Fs,R>Fs,L. C. Fs,R
If you take a given pendulum to the Moon, where the acceleration of gravity is less than on Earth, the resonant frequency of the pendulum will
A) increase. B) decrease. C) not change. D) become zero. E) either increase or decrease; it depends on its length to mass ratio.
An AC series circuit contains a resistor of 20 W, a capacitor of 0.75 mF, and an inductor of 80 mH. What frequency should be used to create a resonance condition in the circuit?
a. 650 Hz c. 160 Hz b. 530 Hz d. 320 Hz