A 2.5-kg object falls vertically downward in a viscous medium at a constant speed of 2.5 m/s. How much work is done by the force the viscous medium exerts on the object as it falls 80 cm?
a. +2.0 J
b. +20 J
c. ?2.0 J
d. ?20 J
e. +40 J
d
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The net force on a moving object suddenly becomes zero. The object then
A. stops abruptly. B. stops during a short time interval. C. changes direction. D. continues at constant velocity. E. slows down gradually.
The linear website structure is appropriate for information presented in historical or chronological order.
Answer the following statement true (T) or false (F)
Which of the following stars will end its life in a supernova?
A) a 10 solar-mass star B) the Sun C) a 1 solar-mass red giant star D) a neutron star
Find the change in entropy (in J/K) when 5.00 moles of an ideal gas undergo a free expansion from an initial volume of 20 cm3 to a final volume of 100 cm3.
A. 71 B. 52 C. 67 D. 191 E. 208