Sound travels through the air in the form of
1) transverse waves,
2) longitudinal waves,
and radio signals travel through the air in the form of
3) transverse waves.
4) longitudinal waves.
Answer: 2, 3
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Latent Heats: A substance has a melting point of 20°C and a heat of fusion of 3.4 × 104 J/kg. The boiling point is 150°C and the heat of vaporization is 6.8 × 104 J/kg at a pressure of one atmosphere. The specific heats for the solid, liquid, and gaseous phases are 600 J/kg ? K (solid), 1000 J/kg ? K (liquid), and 400 J/kg ? K (gaseous). How much heat is required to raise the temperature of 1.90 kg of this substance from -4°C to 106°C at a pressure of one atmosphere?
A. 260 kJ B. 190 kJ C. 230 kJ D. 92 kJ E. 320 kJ
A 20.0 kg hollow cylinder (I = 
) has a diameter of 50.0 cm. The cylinder is rolling down a hill with a velocity of 5.00 m/s. The rotational kinetic energy of the rolling cylinder is
A. 225 J. B. 200 J. C. 175 J. D. 150 J. E. 250 J.
A galactic bar forms from a gravitational disturbance and is a temporary feature of galaxies.
Answer the following statement true (T) or false (F)
Two resistors of values 7.0 and 15.0 ? are connected in parallel. This combination in turn is hooked in series with a 3.8-? resistor and a 22.3-V battery. What is the current in the 3.8-? resistor?
a. 21 A b. 2.6 A c. 0.86 A d. 5.9 A e. 190 A