How much work is done by a person lifting a 2.0-kg object from the bottom of a well at a constant speed of 2.0 m/s for 5.0 s?
a. 0.22 kJ
b. 0.20 kJ
c. 0.24 kJ
d. 0.27 kJ
e. 0.31 kJ
b
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A bungee jumper attains a speed of 30 m/s just as the bungee cord begins to stretch. If the period of stretch is 2 s while coming to a halt, the jumper's average deceleration is about
A) 0.5 g. B) g. C) 1.5 g. D) 2 g.
How does the cosmic background radiation relate to the Big Bang?
What will be an ideal response?
The amount of current produced by electromagnetic induction depends on the
A) amount of induced voltage. B) resistance of the circuit to which it is connected. C) both of these D) none of the above
Two singly ionized isotopes, X and Y, of the same element move with the same speed perpendicular to a uniform magnetic field. Isotope X follows a path of radius 3.35 cm while isotope Y moves along a path 3.43 cm in radius. What is the ratio of the two isotope masses, mY/mX?
a. 0.977 c. 1.05 b. 0.954 d. 1.02