The Universal Gravitational Constant G was first measured by
A) Galileo.
B) Newton.
C) Cavendish.
D) none of these
Answer: C
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A crying baby emits sound with an intensity of 8.0 × 10-8 W/m2
Calculate a reasonable estimate for the intensity level from a set of quintuplets (five babies), all crying simultaneously at the same place? The lowest detectable intensity is 1.0 × 10-12 W/m2. A) 79 dB B) 69 dB C) 56 dB D) 49 dB E) 36 dB
A light source radiates 60.0 W of single-wavelength sinusoidal light uniformly in all directions. What is the average intensity of the light from this bulb at a distance of 0.400 m from the bulb?
A) 14.9 W/m2 B) 37.2 W/m2 C) 27.4 W/m2 D) 11.9 W/m2 E) 29.8 W/m2
The horizontal speed of a projectile
a. is zero b. stays constant c. continuously increases d. continuously decreases e. sometimes decreases and sometimes increases
American power plants usually supply 120 V ac
(a) At what frequency is this voltage supplied? (b) What is the maximum voltage? What will be an ideal response?