When an object floats in a liquid, the buoyant force is ____________ the weight of the object
a. equal to
b. larger than
c. smaller than
d. not related to
a
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Suppose that the speed of an electron traveling 1.0 km/s is known to an accuracy of 1 part in 10,000 (that is, within 0.01%)
What is the minimum uncertainty in the position of this electron? (melectron = 9.11 × 10-31 kg, h = 6.626 × 10-34 J ? s)
A wave is described by y = 10 sin (4.0pt – 6.0px). If the equation is in SI units with the units suppressed, what is its speed?
a. 2/3 m/s c. 1/6 m/s b. 3/2 m/s d. 1/4 m/s
The air in a pipe resonates at 150 Hz and 750 Hz, one of these resonances being the fundamental. If the pipe is open at both ends, how many resonances are between the two given ones, and if the pipe is closed at one end, how many resonances are between the two given ones?
a. open: 3; closed: 1 c. open: 2; closed: 0 b. open: 1; closed: 3 d. open: 0; closed: 2
What is one difference between a rad and a rem?
a. A rad measures an amount of radiation and a rem measures a biological effect. b. A rad measures a biological effect and a rem measures an amount of radiation. c. Rem is an older term for rad. d. One rem equals 100 rads. e. One rad equals 100 rems.