1) A simple pendulum consists of an object with mass m attached to a string with length L. When the object swings upward making an angle of ? with respect to the vertical direction how much work is done by the tension force of the string?
2) Two friends are sitting in two canoes in the middle of a
lake. Both canoes are initially motionless when one of the friends
pushes the other canoe to separate them. Consider the canoes and
people as the system. After pushing the canoes, what is the total
momentum and the total kinetic energy qualitatively (i.e. zero,
nonzero, more, less)?
3)A slingshot shoots a rock, and then a steel ball with twice
the mass of the rock. The force exerted by the slingshot in each
case is the same and is exerted for the same distance. What can we
say about the momentum and kinetic energy of the rock and the ball
qualitatively (i.e. zero, nonzero, more, less)?
4) A ball of mass m strikes a wall that is perpendicular to its
path at speed v and rebounds in the opposite direction with the
same speed. What is the magnitude of the impulse imparted to the
ball by the wall?
5) Alas, you make it to the end of your Physics 2414 exam, but
unfortunately you start to daydream about your favorite movie
series, Star Wars, and the much anticipated return in the coming
winter. You imagine your old pals Han Solo and Chewie flying the
Falcon around space and shooting at Imperial fighters. After
defeating the Imperial dogs, Han brings the Falcon in for landing
on a carrier of mass 6500kg rotating at an angular velocity of 1.8
rads/s. If the carrier is in the shape of a disc and has a diameter
of 300m, what is the angular velocity after the 1000kg Falcon lands
100m from the edge of the carrier, assuming no torque is acting on
the carrier? (We can assume the Falcon as having similar moment of
inertia as a point.)
1) A simple pendulum consists of an object with mass m attached to a string with...
1. A pole is held vertically by attaching wires at a height of 13.4 m above the ground. The other end of each wire is anchored in the ground at a distance of 9.54 m from the base of the pole. The pole makes a right angle with the ground. What is the length of each wire? 2. A bug crawls 2.25 m along the base of a wall. Upon reaching a corner, the bug's direction of travel changes from...