A hydrogen bond is:
a. a sharing of a pair of electrons between a hydrogen and an oxygen nucleus
b. a sharing of a pair of electrons between a hydrogen nucleus and either an oxygen or a nitrogen nucleus
c. a weak attraction between a covalently bonded hydrogen atom and another atom taking part in a separate polar covalent bond
d. the loss of an electron by hydrogen to a highly electronegative atom
e. a strong chemical bond between two ions
c
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What is the mass of a solid sphere that has a density 15.0 × 103 kg/m3 and a radius 10.0 cm?
A) 62.8 kg B) 4.56 kg C) 298 kg D) 3.58 × 106 kg E) 15.0 kg
If the lens diameter is doubled, what happens to the resolvable angle of images produced at fixed wavelength?
A) The angle decreases by a factor of two. B) The angle increases by a factor of two. C) The angle decreases by a factor of four. D) The angle increases by a factor of four. E) The angle stays the same.
Doppler Effect: A whistle produces sound of frequency of 1.00 kHz. If a listener moves with a speed of 30 m/s away from the whistle, what frequency does this person hear if the sound speed is 340 m/s?
A. 912 Hz B. 919 Hz C. 1000 Hz D. 1090 Hz
The turntable of a record player has an angular velocity of 8.0 rad/s when it is turned off. The turntable comes to rest 2.5 s after being turned off. Through how many radians does the turntable rotate after being turned off? Assume constant angular acceleration.
A. 12 rad B. 8.0 rad C. 10 rad D. 16 rad E. 6.8 rad