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J l. A block of mass 3.00 kg is carefully placed on an inclined plane as shown below. Q m Draw a free body diagram of the block showing all of the forces acting on it.
What is the minimum coefﬁcient of static friction for the block to stay in
place? 0. You now give the block the slightest push so it just starts to move. The
coefﬁcient of kinetic friction between thexblock and the plane is uk = 0.475.
Does the block stop or accelerate down the plane? If it accelerates, what is the
magnitude of the acceleration? 9".” 7 G: 2 J 1;") i YEW 5:. L“) [xx “2:2,, V342? W g3
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/*“"’“‘" x with a truck of mass 5.25X 103 kg traveling due south at 15.0 m/s in an icy (Ii/£1}! intersection. If the car and the truck stick together after the collision, what is the
magnitude and direction of the velocity of the wreck? Ignore friction and air resistance. )K/ \ ‘ , $3133“?wa E , 1W 1' “W ‘j 1111 _
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“ N} vertical height of 25.0 m (measured from the starting position of the marble) when
i W ﬁred straight up. The speciﬁcations for the gun state that when it is loaded, the spring
\M’ will be compressed 5.00 cm from its relaxed length. (When the gun is ﬁred, the ball
is released when the spring reaches its relaxed length). a) What should the spring constant k of the spring be?
b) Ignoring air resistance, what will be the speed of the marble when it reaches its original height on the way down? ‘2 l cure is . K 5W {W} 1 g
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3 4. While standing on a long board supported by two ropes, an 80.0 kg painter paints the
side of a building. a) If the mass of the board is 20.0 kg, What are the tensions in the two
ropes? b) If the breaking strength of the ropes is 800. N, how close to the lefthand
rope can the painter stand? 2.00 m 5. A pendulum bob of mass 1.00 kg is at the end of a 5.00 m wire. It is pulled to an
initial angle of 5.00° from the vertical and released. a) What are the period, frequency, angular frequency, and amplitude of the
subsequent simple harmonic motion? b) What is the total energy of the motion? (Hint: what is the maximum potential
energy?) c) Draw graphs of the position (angle) of the mass versus time for a few cycles.
Carefully label the axes, including the scales. ‘ w..
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( “if? a) Find the period for the spaceship in circular orbit at this distance.
W b) What is the speed of the spaceship in this orbit?
c) What is the escape speed for the spaceship to be able to leave the black hole? Q) {N .. if? fee“
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 Spring '07
 Graham
 Physics

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