How much heat must be removed from 456 g of water at 25.0°C to change it into ice at -10.0°C? The specific heat of ice is 2090 J/kg ? K, the latent heat of fusion of water is 33.5 × 104 J/kg, and the specific heat of water is 4186 J/kg ? K
A) 105 kJ
B) 153 kJ
C) 57.3 kJ
D) 47.7 kJ
E) 210 kJ
E
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What would happen if the fusion rate in the core increased but the core could not expand?
A) The Sun's core would heat and the rate of fusion would increase further. B) The Sun's core would reach a new equilibrium, but at a cooler temperature. C) The Sun's core would reach a new equilibrium, but at a higher temperature. D) The Sun's core would cool and the rate of fusion would decrease.
Charge of uniform density (20 nC/m2) is distributed over a cylindrical surface (radius = 1.0 cm), and a second coaxial surface (radius = 3.0 cm) carries a uniform charge density of ?12 nC/m2 . Determine the magnitude of the electric field at a point 4.0 cm from the symmetry axis of the two surfaces
a. 0.45 kN/C b. 1.0 kN/C c. 0.73 kN/C d. 0.56 kN/C e. 2.3 kN/C
The owner of a cabin that is located on a small stream is thinking of placing a dam across the stream to create a possible drop of 120 cm. The stream is measured to have approximate dimensions of 180 cm by 10 cm and a leaf on the water’s surface is observed to travel 10 m in 8 s. If an 80% efficient turbine is used, how much power can the owner expect to generate?
(A) 1 kW (B) 2 kW (C) 3 kW (D) 4 kW
A satellite is in an elliptical orbit around Earth. At one point on the ellipse, it is 25 × 106 m from the center of Earth and has a speed of 12,000 m/s
What is its speed when it is at another point on the ellipse, 95 × 106 m from the center of Earth? The mass of Earth is 5.97 × 1024 kg and G = 6.67 x 10-11 N•m2/kg2. A) 12000 m/s B) 11000 m/s C) 10000 m/s D) 9000 m/s E) 8000 m/s