If 150 kcal of heat raises the temperature of 2.0 kg of a material by 400 F°, what is the specific heat capacity of the material?
A) 0.34 kcal/kg ? C° B) 0.75 kcal/kg ? C° C) 0.19 kcal/kg ? C° D) 1.35 kcal/kg ? C°
A
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Thin Lenses: An object is placed 60 cm from a convex lens with a focal length of magnitude 10 cm. What is the magnification?
A. -0.10 B. 0.10 C. 0.15 D. 0.20 E. -0.20
A cup of coffee is enclosed on all sides in an insulated container 1/2 cm thick in the shape of a cube 10 cm on a side. The temperature of the coffee is 95°C, and the temperature of the surroundings is 21°C. Find the rate of heat loss (in J/s) due to conduction if the thermal conductivity of the cup is 2 × 10?4 cal/s?cm?°C.
A. 62 B. 74 C. 230 D. 160 E. 12
A car is traveling on an interstate where north is taken to be the positive direction. A graph of the distance it has moved as a function of time is shown. What is the physical significance of the slope?
A. The distance the car has moved.
B. The velocity of the car.
C. The acceleration of the car.
Sound waves propagate in two dimensions
a. True b. False Indicate whether the statement is true or false