A truck moving at 36 m/s passes a police car moving at 45 m/s in the opposite direction. If the frequency of the siren is 500 Hz relative to the police car, what is the change in frequency (in Hz) heard by an observer in the truck as the two vehicles pass each other? (The speed of sound in air is 343 m/s.)
a. 242
b. 238
c. 240
d. 236
e. 234
C
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When 1.0 gram of hydrogen combines with 8.0 grams of oxygen, 9.0 grams of water is formed. But is this true? During the reaction 2.86 × 10^5 J of energy is released. How much mass is actually lost in this reaction?
Which of the following best describes the nature and origin of the atmospheres of the Moon and Mercury?
A) They have thin exospheres only, with gas coming from impacts of subatomic particles and photons. B) They have thin tropospheres only, with gas coming from vaporization. C) They have only small amounts of gas, all of which is left over from outgassing long ago. D) They have thin atmospheres produced by outgassing, but still have the layers of a troposphere, thermosphere, and exosphere.
The thermal efficiency e of a heat engine is defined as follows: e=W/Qh. Express the efficiency in terms of Qh and Qc.
The energy used for "minor" uses adds up to truly gigantic amounts
What will be an ideal response?