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.
Part C
Find the height yi
from which the rock was launched.
Express your answer in meters to three significant figures.
Learning Goal:
To practice Problem-Solving Strategy 4.1 for projectile motion problems.
A rock thrown with speed 12.0 m/s and launch angle 30.0 ∘ (above the horizontal) travels a horizontal distance of d = 19.0 m before hitting the ground. From what height was the rock thrown? Use the value g = 9.800 m/s2 for the free-fall acceleration.
PROBLEM-SOLVING STRATEGY 4.1 Projectile motion problems
MODEL: Is it reasonable to ignore air resistance? If so, use the projectile motion model.
VISUALIZE: Establish a coordinate system with the x-axis horizontal and the y-axis vertical. Define symbols and identify what the problem is trying to find. For a launch at angle θ, the initial velocity components are vix=v0cosθ and viy=v0sinθ.
SOLVE: The acceleration is known: ax=0 and ay=−g. Thus, the problem becomes one of…
Phys 25
Chapter 5 Solutions
Physics for Scientists and Engineers with Modern Physics, Technology Update
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