How many kilocalories of heat would be needed to melt 0.12 kg of ice at 0°C and increase the temperature to 25°C?
13 kcal
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Quintessence is the name of the
a. force that lead to the inflationary period of the universe. b. five dimensional space of the universe. c. force suspected to cause the current acceleration in the rate of expansion of the universe. d. one of the particles of dark matter related to WIMPs. e. the force that holds the proton together.
Energy Conservation With Nonconservative Forces: If a stone is dropped with an initial gravitational potential energy of 100 J but reaches the ground with a kinetic energy of only 75 J, this is a violation of the principle of conservation of energy.
A. True B. False
A parallel-plate capacitor with plate separation of 1.0 cm has square plates, each with an area of 6.0 × 10-2 m2
What is the capacitance of this capacitor if a dielectric material with a dielectric constant of 2.4 is placed between the plates, completely filling them? (?0 = 8.85 × 10-12 C2/N ? m2) A) 1.3 × 10-10 F B) 1.3 × 10-12 F C) 15 × 10-14 F D) 64 × 10-14 F E) 15 × 10-12 F
Why do firemen use infrared cameras to look into smoke filled buildings?
A) The smoke itself gives off a lot of infrared light. B) They can avoid all the broken glass because glass is bright in infrared light. C) They can see through the smoke to look for people inside the room. D) They can see if there is anything radioactive in the room. E) They can tell if the smoke is toxic.