A certain radio wave has a frequency of 1.03 MHz. What is the wavelength?
2.91 × 10^2 m
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The motion of the tectonic plates is driven by
A) the gravitational pull of the Moon and Sun. B) the elliptical nature of Earth's orbit. C) heat moving by convection. D) magnetic repulsion. E) Earth's subsurface convection cycle.
Capacitors of values 1.0 F, 2.0 F, 3.0 F, and 6.0 F are connected in series across a 12 V power supply. Which capacitor has the greatest potential difference across it?
A. the 1.0 F capacitor B. the 2.0 F capacitor C. the 3.0 F capacitor D. the 6.0 F capacitor E. they all are equal
Why does the temperature of the gas between galaxies in galaxy clusters tell us about the mass of the cluster?
A) The temperature tells us the average speeds of the gas particles, which are held in the cluster by gravity, so we can use these speeds to determine the cluster mass. B) Temperature is always directly related to mass, which is why massive objects are always hotter than less massive objects. C) The temperature of the gas tells us the gas density, so we can use the density to determine the cluster's mass. D) The question is nonsense; gas temperature cannot possibly tell us anything about mass.
A 406.0 kg copper bar is put into a smelter for melting. The initial temperature of the copper is 300.0 K. How much heat must the smelter produce to completely melt the copper bar?
(The specific heat for copper is 386 J/kg ? K, the heat of fusion for copper is 205 kJ/kg, and its melting point is 1357 K.) A) 2.49 × 105 kJ B) 1.66 × 1011 kJ C) 1.66 × 108 kJ D) 2.96 × 105 kJ