A radioactive atom has 98 protons and 249 nucleons. If it undergoes alpha decay, what are the number of protons and nucleons, respectively, in the daughter nucleus?
A) 100, 249 B) 100, 245 C) 96, 245 D) 96, 247 E) 94, 247
C
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The average molecular kinetic energy of a gas can be determined by knowing
A) only the number of molecules in the gas. B) only the volume of the gas. C) only the pressure of the gas. D) only the temperature of the gas. E) All of the above quantities must be known to determine the average molecular kinetic energy.
A series RLC circuit has a 150-? resistor, a 6.00-mH inductor and a 0.200-?F capacitor connected across a 120-V rms ac source at 15.0 kHz. What is the phase angle of the circuit?
A) 47.3° B) 0° C) 45.0° D) 90.0° E) 73.7°
One mole of helium gas expands adiabatically from 2 atm pressure to 1 atm pressure. If the original temperature of the gas is 20°C, what is the final temperature of the gas? (g = 1.67)
A 2.0-kg block slides down a plane (inclined at 40° with the horizontal) at a constant speed of 5.0 m/s. At what rate is the gravitational force on the block doing work?
a. +98 W b. +63 W c. zero d. +75 W e. -75 W