Homework Help: physics

Posted by p on Saturday, July 16, 2011 at 2:44am.

A student in a lab exerts a 14 N force to pull a block a distance of 63 cm. If a total of 8 J of work is done, the angle between the force and the displacement is

none of the above
89°
25°
61°
65°

physics - p, Saturday, July 16, 2011 at 2:48am
A 1.6-kg block is dropped from 66 cm above a spring in equilibrium. The force constant for the spring is 142 N/m. Calculate the maximum compression in the spring.
physics - CANTIUS, Sunday, July 31, 2011 at 3:15am
work = force (in direction of motion) X distance
W = (F cos t) x
cos t = W/Fx
t = arccos(W/Fx) = arccos [8/(14)(0.63)] = arccos 0.907 = 24.9 = 25 degrees

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