A heat engine has an efficiency of 31.4% and receives 8.72 kJ of heat per cycle
(a) How much work does it perform in each cycle?
(b) How much heat does it exhaust in each cycle?
What will be an ideal response?
(a) 2.74 Kj (b) 5.98 kJ
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An ambulance is generating a siren sound at a frequency of 2,000 Hz. The velocity of sound is 345.0 m/s. The observer and the ambulance are traveling toward each other at a velocity of 24.00 m/s. If the ambulance is stationary, what is the frequency of the siren perceived by the observer?
A. 2,640 Hz B. 2,559 Hz C. 2,324 Hz D. 2,139 Hz E. 2,003 Hz
At the speed of light, how long would it take to go from Earth to the Sun?
a. about a second b. about a minute c. about 8 minutes d. about a day e. about a year
The International Space Station has a mass 1.8 × 105 kg. A 70.0-kg astronaut inside the station pushes off one wall of the station so she accelerates at 1.50 m/s2
What is the magnitude of the acceleration of the space station as the astronaut is pushing off the wall relative to an observer initially at rest relative to the space station before the push? A) 5.8 × 10-4 m/s2 B) 1.50 m/s2 C) 4.7 × 10-4 m/s2 D) zero E) 3.9 × 10-3 m/s2
What are the two geological features that appear to set Earth apart from all the other terrestrial worlds?
A) plate tectonics and a high level of erosion B) a dense core and plate tectonics C) significant volcanism and tectonics D) mantle convection and a thick atmosphere