A solid object is made of two materials, one material having density of 2000 kg/m3 and the other having density of 8000 kg/m3 . If the object contains equal volumes of the materials, what is its average density?
a. 3000 kg/m3
c. 5000 kg/m3
b. 3200 kg/m3
d. more information is needed
C
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An alternating current circuit has resistance R, inductance L, and capacitance C in series with a voltage source. Which statement is correct?
A. The voltage across the capacitor leads the voltage across the inductor by 90°. B. The voltage across the inductor leads the voltage across the capacitor by 90°. C. The voltage across the inductor leads the voltage across the resistor by 180°. D. The voltage across the inductor is out of phase with the voltage across the capacitor by 180°. E. Both voltages lead the voltage across the resistor by 90°.
An 8 000-kg aluminum flagpole 100-m long is heated by the sun from a temperature of 10°C to 20°C. Find the heat transferred (in J) to the aluminum if the specific heat of aluminum is 0.215 cal/g/°C
a. 7.2 × 10^5 b. 7.2 × 10^7 c. 7.2 × 10^3 d. 7.2 × 10^1 e. 7.2 × 10^2
The Arecibo radio message to extraterrestrials contains information about the structure of DNA
a. True b. False Indicate whether the statement is true or false
A heavy sled and a light sled, both moving horizontally with the same kinetic energy, suddenly slide onto a rough patch of snow and eventually come to a stop
The coefficient of kinetic friction between the sleds and the rough snow is the same for both of them. Which of the following statements about these sleds are correct? (There could be more than one correct choice.) A) Both sleds will slide the same distance on the rough snow before stopping. B) The heavy sled will slide farther on the rough snow than the light sled. C) The light sled will slide farther on the rough snow than the heavy sled. D) On the rough snow, the change in kinetic energy will be the same for both sleds. E) The friction force exerted on the sleds by the snow will do the same amount of work on both sleds.