A thermally isolated system is made up of a hot piece of aluminum and a cold piece of copper; the aluminum and the copper are in thermal contact. The specific heat of aluminum is more than double that of copper
Which object experiences the greater temperature change during the time the system takes to reach thermal equilibrium? A) The copper experiences a greater temperature change.
B) The aluminum experiences a greater temperature change.
C) Neither; both objects experience the same magnitude temperature change.
D) It is impossible to tell without knowing the masses.
E) It is impossible to tell without knowing the volumes.
D
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A sample of water has a mass of 10.0 grams. What is the number of molecules of water in the 10.0 gram sample (H = 1u, O = 16u)?
a. 
b. 
c. 
d. 
e. 
The acceleration of a ball as it rolls down a ramp is 4 m/s2 . The ball is referred to 2 s after it starts to roll. A racecar driver steps on the gas, and his racecar travels 20 meters in 2 seconds starting from rest. The acceleration of the racecar is
a. 0 d. 10 m/s2 b. 5 m/s2 e. 20 m/s2 c. 9.8 m/s2
In a steam engine, steam at 140°C in a turbine does work on an external system, and the steam leaves the turbine at 100°C. The efficiency of the steam engine is 5%. The relevant physical principle is the __________ law of thermodynamics
Fill in the blank(s) with correct word
Planet Zero has a mass of 5.0 × 1023 kg and a radius of 2.0 × 106 m. A space probe is launched vertically from the surface of Zero with an initial speed of 4.0 km/s. What is the speed of the probe when it is 3.0 × 106 m from Zero's center?
A. 3.0 km/s B. 2.2 km/s C. 1.6 km/s D. 3.7 km/s E. 5.9 km/s