A blimp is filled with 440 m3 of helium. How big a payload can the balloon lift? (The density of air is 1.29 kg/m3; the density of helium is 0.178 kg/m3.)
a. 396 kg
b. 568 kg
c. 78.3 kg
d. 489 kg
e. 646 kg
d
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Which of the following is the Sun predicted to do in the future based on theoretical models and observations of other stars?
A) The Sun will gradually get brighter over time. B) The Sun will gradually get dimmer over time. C) The Sun will maintain the same brightness during its entire lifetime. D) The Sun will gradually rotate faster. E) The Sun will get gradually closer to the Earth.
According to the uncertainty principle, a particle such as an electron
A) must have uncertainties in position and velocity that remain smaller than a particular prescribed value. B) has a precise position and a precise velocity, but the observer is unable to determine them. C) does not have a precise position or a precise velocity. D) can have arbitrarily small simultaneous uncertainties in both position and velocity, although neither uncertainty can be zero. E) is entirely made of sausage.
At the time of the winter solstice (the start of winter) the sunlight is at a lower angle and thus is ____ than(as) in the start of summer in the northern hemisphere
a. less intense b. more intense c. the same intensity
When air contains as much water vapor as it can possibly hold for a given temperature, the air is at
A) capacity. B) optimum threshold. C) its evaporation point. D) sublimation point.