EBK PHYSICS
5th Edition
ISBN: 8220103026918
Author: Walker
Publisher: PEARSON
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Chapter 5, Problem 28PCE
A shopper pushes a 7 5-kg shopping cart up a 13* incline, as shown in Figure 5-32. Find the magnitude of the horizontal force,
Figure 5-32 Problem 28
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O Option 3
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A block of mass m -1 kg is found
on an inclined plane that makes an
angle 30° with the horizontal. The
coefficient of static friction and coef-
ficient of kinetic friction between the
block and the incline are: H. = 0.6
and - 0.5. Take the positive di-
rection to be up the inclined plane
With the block initially at rest, the acceleration of the block is
a = -9.33
a = 0.66
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O Option 2
a = 0
a = -0,66
O Option 1
O Option 3
With the block initially moving up the inclined, the acceleration is:
a = 0,66
a = -9.33
O Option 2
O Option 4
a = -0,66
a = 0
A 3.5 kg block is pushed along a horizontal floor by a force F of magnitude 15 N at an angle q = 40 with the horizontal. The coefficient of kinetic friction between the block and the floor is 0.25. Calculate the magnitudes of a) the frictional force on the block from the floor and b) the block's acceleration.
Chapter 5 Solutions
EBK PHYSICS
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- A 75.0-g arrow, fired at a speed of 110 m/s to the left, impacts a tree, which it penetrates to a depth of 12.5 cm before coming to a stop. Assuming the force of friction exerted by the tree is constant, what are the magnitude and direction of the friction force acting on the arrow?arrow_forwardAn automobile driver traveling down an 8% grade slams on his brakes and skids 30 m before hitting a parked car. A lawyer hires an expert who measures the coefficient of kinetic friction between the tires and road to be k = 0.45. Is the lawyer correct to accuse the driver of exceeding the 25-MPH speed limit? Explain.arrow_forwardA box with mass m1 = 6.00 kg sliding on a rough table with a coefficient of kinetic friction of 0.220 is connected by a mass-less cord strung over a mass-less, frictionless pulley to a second box of mass m2 = 12.0 kg hanging from the side of the table (Fig. P5.51). What is the tension in the cord connecting the boxes?arrow_forward
- A crate of weight Fg is pushed by a force P on a horizontal floor as shown in Figure P4.83. The coefficient of static friction is s, and P is directed at angle below the horizontal. (a) Show that the minimum value of P that will move the crate is given by P=sFgsec1stan (b) Find the condition on in terms of , for which motion of the crate is impossible for any value of P. Figure P4.83arrow_forwardTwo objects are connected by a siring that passes over a frictionless pulley as in Figure 5.14a. where m1 m2 and a1 and a2 are the magnitudes of the respective accelerations. Which mathematical statement is true regarding (he magnitude of the acceleration a2 of the mass m2? (a) a2 g (b) a2 g (c) a2 = g (d) a2 a1 (e) a2 a1 Figure 5.14 (Example 5.9) The Atwood machine, (a) Two objects connected by a massless inextensible string over a frictionless pulley. (b) The free-body diagrams for the two objects.arrow_forwardAn object of mass m = 1.00 kg is observed to have an acceleration a with a magnitude of 10.0 m/s2 in a direction 60.0 east of north. Figure P4.29 shows a view of the object from above. The force F2 acting on the object has a magnitude of 5.00 N and is directed north. Determine the magnitude and direction of the one other horizontal force F1 acting on the object. Figure P4.29arrow_forward
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