An increase of 40 dB increases the sound intensity by a factor of
a. 1000.
b. 40000.
c. 10000.
d. 4000.
c
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A bubble having a diameter of 1.00 cm is released from the bottom of a swimming pool where the depth is 5.00 m. What will the diameter of the bubble be when it reaches the surface? The temperature of the water at the surface is 20.0°C, whereas it is 15.0°C at the bottom. (The density of water is 1.00 × 103 kg/m3.)
A. 1.05 cm B. 1.15 cm C. 1.45 cm D. 1.65 cm E. 1.35 cm
A straight wire carries a current of 40 A in a uniform magnetic field (magnitude = 80 mT). If the force per unit length on this wire is 2.0 N/m, determine the angle between the wire and the magnetic field
a. either 39° or 141° b. either 25° or 155° c. either 70° or 110° d. either 42° or 138° e. either 65° or 115°
A model car is propelled by a cylinder of carbon dioxide gas. The cylinder emits gas at a rate of 5.00 g/s with an exit speed of 80.0 m/s. The car has a mass of 455 g, including the CO2 cylinder. Starting from rest, what is the car's initial acceleration?
a. 0.879 m/s2 b. 40.0 m/s2 c. 36.4 m/s2 d. 7.28 m/s2 e. 1.38 m/s2
The change in entropy of a mass m of a solid substance which has a latent heat of fusion LF and melts at a temperature T is
A. LFT/m B. mLFln(T) C. mLFT D. mLF/T E. LF/mT