A porch roof sloping at 45° accumulated snow to a depth of 30. cm. The roof measured 3.0 m × 5.0 m. If the density of snow was 15. kg/ m2, what was the weight of the snow, in pounds, on the roof?
A) 210 lb
B) 74 lb
C) 56 lb
D) 148 lb
E) 105 lb
E
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A steel bar with a cross-sectional area of 1.00 × 10-4 m2 is heated to 100°C and then it is clamped at both ends with clamps that are 2.0 m apart
When the bar cools to 20°C what is the force exerted by the bar on the clamps? The coefficient of thermal expansion of steel is 12 × 10-6 K-1 and Young's modulus for steel is 20 × 1010 N/m2. A) 1.9 × 104 N B) 3.8 × 104 N C) 1.9 × 103 N D) 3.8 × 103 N E) 1.9 × 105 N
A block of ice at 0.000°C is added to a well-insulated 147-g aluminum calorimeter cup that holds 200 g of water at 10.0°C
The water and aluminum cup are in thermal equilibrium, and the specific heat of aluminum is 910 J/(kg?K). If all but 2.00 g of ice melt, what was the original mass of the block of ice? The specific heat of water is 4190 J/(kg?K), its latent heat of fusion is 334 kJ/kg, and its latent heat of vaporization is 2260 kJ/kg. A) 31.1 g B) 35.6 g C) 38.8 g D) 42.0 g E) 47.6 g
An electron-volt is the energy gained by an electron if it is accelerated through a potential difference of one volt
What is the equivalent to an electron-volt in kilograms? (c = 3.00 × 108 m/s, e = 1.60 × 10-19 C)
What will the temperature of the cosmic microwave background be when the average distances between galaxies are twice as large as they are today?
A. 1.365 B. 4.860 C. 5.250 D. 3.375