A 25.0-kg object sitting at rest is struck elastically in a head-on collision with a 20.5-kg object initially moving at +4.0 m/s. Find the final velocity of the 25.0-kg object after the collision
a. ?0.90 m/s
b. ?3.6 m/s
c. +6.6 m/s
d. +3.6 m/s
e. +15 m/s
d
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A brass rod of length L 5 0.75 m is twisted by torques T until the angle of rotation between the ends of the rod is 3.58. The allowable shear strain in the copper is 0.0005 rad. The maximum permissible diameter of the rod is approximately:
(A) 6.5 mm
(B) 8.6 mm
(C) 9.7 mm
(D) 12.3 mm
What observations characterize solar maximum?
A) There are many sunspots visible on the surface of the Sun. B) The Sun rotates faster at its poles. C) The Sun becomes much brighter. D) The Sun emits light of longer average wavelength. E) all of the above
The following force vectors act on an object: i) 50.0 newtons at 45.0 degree north of east and ii) 25.0 newtons at 30.0 degree south of east. Which of the following represents the magnitude of the resultant and its angle relative to the easterly direction?
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