A block of mass 3.00 kg is pushed up against a wall by a force P → that makes an angle of θ = 50.0° with the horizontal as shown in Figure P5.34. The coefficient of static friction between the block and the wall is 0.250. (a) Determine the possible values for the magnitude of P → that allow the block to remain stationary. (b) Describe what happens if | P → | has a larger value and what happens if it is smaller. (c) Repeal parts (a) and (b), assuming the force makes an angle of θ = 13.0° with the horizontal. Figure P5.34
A block of mass 3.00 kg is pushed up against a wall by a force P → that makes an angle of θ = 50.0° with the horizontal as shown in Figure P5.34. The coefficient of static friction between the block and the wall is 0.250. (a) Determine the possible values for the magnitude of P → that allow the block to remain stationary. (b) Describe what happens if | P → | has a larger value and what happens if it is smaller. (c) Repeal parts (a) and (b), assuming the force makes an angle of θ = 13.0° with the horizontal. Figure P5.34
A block of mass 3.00 kg is pushed up against a wall by a force
P
→
that makes an angle of θ = 50.0° with the horizontal as shown in Figure P5.34. The coefficient of static friction between the block and the wall is 0.250. (a) Determine the possible values for the magnitude of
P
→
that allow the block to remain stationary. (b) Describe what happens if
|
P
→
|
has a larger value and what happens if it is smaller. (c) Repeal parts (a) and (b), assuming the force makes an angle of θ = 13.0° with the horizontal.
13.87 ... Interplanetary Navigation. The most efficient way
to send a spacecraft from the earth to another planet is by using a
Hohmann transfer orbit (Fig. P13.87). If the orbits of the departure
and destination planets are circular, the Hohmann transfer orbit is an
elliptical orbit whose perihelion and aphelion are tangent to the
orbits of the two planets. The rockets are fired briefly at the depar-
ture planet to put the spacecraft into the transfer orbit; the spacecraft
then coasts until it reaches the destination planet. The rockets are
then fired again to put the spacecraft into the same orbit about the
sun as the destination planet. (a) For a flight from earth to Mars, in
what direction must the rockets be fired at the earth and at Mars: in
the direction of motion, or opposite the direction of motion? What
about for a flight from Mars to the earth? (b) How long does a one-
way trip from the the earth to Mars take, between the firings of the
rockets? (c) To reach Mars from the…
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Chapter 5 Solutions
Physics For Scientists And Engineers With Modern Physics, 9th Edition, The Ohio State University
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