A baseball infielder, mass 78.0 kg, jumps up with velocity 3.50 m/s and catches a 0.195-kg baseball moving horizontally at 55.0 m/s. Of the following, which is closest to the final momentum of the system, infielder and baseball?
a. 273 kg/m/s
b. 328 kg/m/s
c. 284 kg/m/s
d. 240 kg/m/s
e. 293 kg/m/s
a
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After a skydiver reaches terminal velocity,
A. the force of gravity no longer performs work on the skydiver. B. work performed by the force of gravity is converted into gravitational potential energy. C. gravitational potential energy is no longer available to the system of the skydiver plus the Earth. D. gravitational potential energy is converted into thermal energy. E. thermal energy is converted into gravitational potential energy.
A 0.28-kg stone you throw rises 34.3 m in the air. The impulse the stone receives from your hand while being thrown is
a. 2.7 Ns, up. b. 2.7 Ns, down. c. 7.3 Ns, up. d. 7.3 Ns, down. e. 9.6 Ns, up.
A sealed container holds 0.020 moles of nitrogen (N2) gas at a pressure of 1.5 atmospheres and a temperature of 290 K. The atomic mass of nitrogen is 14 g/mol
The Boltzmann constant is 1.38 × 10-23 J/K and the ideal gas constant is R = 8.314 J/mol ? K = 0.0821 L ? atm/mol ? K. The average translational kinetic energy of a nitrogen molecule is closest to A) 4.0 × 10-21 J. B) 6.0 × 10-21 J. C) 8.0 × 10-21 J. D) 10 × 10-21 J. E) 12 × 10-21 J.
The ripple frequency of a bridge rectifier is
a. double the input frequency. b. the same as the input frequency c. triple the input frequency. d. quadruple the input frequency.