A certain spherical asteroid has a mass of is 4.65 × 1017 kg and a radius of 39,600 m
If a 150-kg object is dropped from rest at an altitude of 12,400 m above the surface of this asteroid, with what speed will it hit the surface? (G = 6.67 × 10-11 N ? m2/kg2 )
A) 19.3 m/s
B) 22.7 m/s
C) 26.2 m/s
D) 18.2 m/s
E) 13.8 m/s
A
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A 50-g ball moving at 10 m/s in the +x direction suddenly collides head-on with a stationary ball of mass 100 g. If the collision is perfectly elastic, what is the velocity of each ball immediately after the collision?
A) -3.3 m/s, +6.7 m/s B) +6.7 m/s, -3.3 m/s C) -6.7 m/s, +3.3 m/s D) +3.3 m/s, -6.7 m/s
What is the change in entropy when 15.0 g of water at 100°C are turned into steam at 100°C? The latent heat of vaporization of water is 22.6 × 105 J/kg
A) 90.8 J/K B) -90.8 J/K C) 339 J/K D) -339 J/K E) 0 J/K
The operation of hydraulic brakes in a car is based upon ________ Principle.
Fill in the blank(s) with the appropriate word(s).
In a thermodynamic process, the internal energy of a system in a container with adiabatic walls decreases by 800 J. Which statement is correct?
a. The system lost 800 J by heat transfer to its surroundings. b. The system gained 800 J by heat transfer from its surroundings. c. The system performed 800 J of work on its surroundings. d. The surroundings performed 800 J of work on the system. e. The 800 J of work done by the system was equal to the 800 J of heat transferred to the system from its surroundings.