Which is a current good approximation for the speed of light?
a. 186,000 meters per second.
b. 3 × 10^8 meters per second.
c. 3 × 10^8 miles per second.
d. 3 × 10^18 meters per second.
e. 333 meters per second.
b
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A 0.50-kg box is attached to an ideal spring of spring constant 20 N/m on a horizontal, frictionless floor
The box oscillates in simple harmonic motion and has a speed of 1.5 m/s at the equilibrium position. (a) What is the amplitude of vibration? (b) At what distance from the equilibrium position are the kinetic energy and the potential energy the same?
If I0 = 10?12 W/m2 is the threshold of hearing, a sound with intensity I1 = 10?11 W/m2 will give a certain decibel level. Suppose a new sound has an intensity I2 = 2I12/I0 . What is the new decibel level?
a. 2.3 dB b. 23 dB c. 100 dB d. it will square the decibel level e. 1.0 dB
Possible units for the coefficient of volume expansion are:
A. mm/C? B. mm3/C? C. (C?)3 D. 1/(C?)3 E. 1/C?
In the hydraulic device shown, when the small piston is pushed down 10 cm with a force of 10 N, the large piston is raised 1 cm. This means that the large piston is capable of lifting
1) 10 N, 2) 100 N, 3) 1000 N, 4) any amount of weight, which illustrates 5) that impulse is equal to a change in momentum. 6) (F × d) input = (F × d) output. 7) Newton's second law. 8) that the stored energy that a body possesses may be transformed into other forms of energy.