Eleven molecules have speeds 16, 17, 18, . . . , 26 m/s. Calculate the root-mean-square of this group of molecules
A) 21.2 m/s
B) 21.0 m/s
C) 21.5 m/s
D) 21.7 m/s
A
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These photos show two different astronomical objects. Which object is bigger, and by about how much?
A) Object 2 is more than a trillion times as large as Object 1. B) Object 2 is approximately 1,000 times as large as Object 1. C) Object 2 is about 10 times as large as Object 1. D) Object 1 is about 10 times as large as Object 2. E) Both objects are about the same size.
The star Polaris is important because it
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If the headlights on a car are separated by 1.3 m, how far down the road can they be resolved if the angular resolution of the eye is 5.0 × 10-4 rad and the person has excellent vision?
A) 1.3 km B) 5.0 km C) 4.8 km D) 0.65 km E) 2.6 km
A 44.0-g block of ice at -15.0°C is dropped into a calorimeter (of negligible heat capacity) containing 100g of water at 5.0°C
When equilibrium is reached, how much of the ice will have melted? The specific heat of ice is 2090 J/kg ? K, that of water is 4186 J/kg ? K, and the latent heat of fusion of water is 33.5 × 104 J/kg. A) 5.2 g B) 4.4 g C) 21 g D) 2.1 g E) 52 g