Which of the following statements about strong or weak bases is true?
A) A weak base completely separates into ions in water.
B) A weak base will not react with a strong acid.
C) A strong base is always corrosive.
D) A strong base will readily accept protons from even weak acids.
Answer: D
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Pressure: A 100-kg person sits on a 5-kg bicycle. The total weight is borne equally by the two wheels of the bicycle. The tires are 2.0 cm wide and are inflated to a gauge pressure of 8.0 × 105 Pa. What length of each tire is in contact with the ground?
A. 1.6 cm B. 1.8 cm C. 3.2 cm D. 2.4 cm E. 6.4 cm
The graphs below show a voltage phasor at different instances of time. Which voltage phasor shows the instantaneous value of the voltage with the largest magnitude?
a.
b.
c.
d.
In order of visual luminosity at the start, which is most luminous?
A) a red supergiant B) a planetary nebula C) a nova D) a type I supernova E) a type II supernova
A champion athlete can produce one horsepower (746 W) for a short period of time. If a 70-kg athlete were to bicycle to the summit of a 500-m high mountain while expending power at this rate, she would have used at least ____ J of energy
a. 746 b. 3.43 × 105 c. 3.73 × 105 d. 7.46 × 105 e. 2.61 × 107