Jupiter and Saturn emit ____ heat than absorbed from the Sun due to _____ is the result of____
a. excess; nuclear reactions in their liquid metallic hydrogen cores.
b. less; nuclear fusion of hydrogen to helium in their liquid metallic hydrogen cores.
c. excess; heat left over from their formation
d. less; heat left over from their formation
C
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A car has a mass of 1000 kg and accelerates at 2 m/s2. What net force is exerted on the car?
A) 500 N B) 1000 N C) 1500 N D) 2000 N E) none of these
Lillian safely touches a 100,000-volt Van de Graaff generator. Although the voltage is high, the relatively small amount of charge means a relatively small amount of
A) energy transfer. B) electric field. C) polarization. D) conduction.
A mule is an example of an exception to which of the fundamental characteristics of life?
A) response to environment?mules cannot respond to changing environmental conditions and that is why they are stubborn B) evolutionary adaptation?because mules are sterile they cannot evolve and adapt C) growth and development-mules being sterile do not grow and develop like other life forms D) reproduction?a mule is sterile and cannot reproduce even though it is the product of reproduction between two closely related animals (a horse and a donkey)
A real (non-Carnot) heat engine, operating between heat reservoirs at temperatures of 650 K and 270 K, performs 4.3 kJ of net work and rejects 8.0 kJ of heat in a single cycle. The thermal efficiency of this heat engine is closest to
A) 0.35. B) 0.31. C) 0.28. D) 0.38. E) 0.42.