Physics for Scientists and Engineers
6th Edition
ISBN: 9781429281843
Author: Tipler
Publisher: MAC HIGHER
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Chapter 5, Problem 67P
To determine
To Find: The value of constant b in the air drag force expression.
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The drag on a pitched baseball can be surprisingly large. Suppose a 145 gram baseball with a diameter of 7.4 cm has an initial speed of 40.2 m/s (90 mph).
a) What is the magnitude of the ball’s acceleration due to the drag force?
b) If the ball had this same acceleration during its entire 18.4m trajectory, what would its final speed be?
A 4.00 kg box sits atop a 10.0 kg box on a horizontal table. The coefficient of kinetic friction between the two boxes and the lower box and table is 0.600, while the coefficient of static frction between these same surfaces is 0.800. A horizontal pull of 150.0 N to the right is exerted on the lower box, and the boxes move together. What is the friction force on the upper box?
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Answer:
Chapter 5 Solutions
Physics for Scientists and Engineers
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- A 2kg box is being pulled up a ramp by a force of 24N. The ramp is at an angle of 35 degrees from the ground. The force of friction on the box is 1.5N. What is the magnitude and direction of the component of gravity in the x-direction?arrow_forwardRunning on a treadmill is slightly easier than running outside because there is no drag force to work against. Suppose a 60 kg runner completes a 5.0 km race in 19 minutes. The density of air is 1.20 kg/m3 Determine the drag force on the runner during the race. Suppose that the runner has the cross section area of 0.72 m2 and the drag coefficient of 1.2. What is this force as a fraction of the runner's weight?arrow_forwardA 45 kg box is at rest at one end of a 2 meter board. That end of the board is slowly raised at an incline until the box starts to slide. At that point, the angle is at 34 degrees. The coefficient of kinetic friction is 0.50N. Please help me calculate the coefficient of static friction between both the box and the board?arrow_forward
- A spherical raindrop of mass 0.0128 g and radius 1.45 mm falls from a cloud that is at a height of 1139 m above the ground. Assume the drag coefficient for the raindrop is 0.60 and the density of the air is 1.3 kg/m3. What is the raindrop's terminal speed? And what would the raindrop's speed just before landing on the ground if therewere no drag force (no air resistance)?arrow_forwardI need help with this Hw Problem.arrow_forwardA constant force Fa pushes a 22.5-kg box across a rough horizontal surface. The magnitude of Fa is 185 N and the force is inclined at an angle of θ = 30.0° below the horizontal. The coefficient of kinetic friction between the box and the surface is μk = 0.500. What is the magnitude of the box's acceleration?arrow_forward
- a 45kg gymnast wedges himself between two closely spaced vertical walls by pressing his hands and feet against the walls. What is the magnitude of the friction force on each hand and foot? Assume they are all equal. Express your answer with the appropriate units.arrow_forwardJust B please.arrow_forwardA 100kg box is at rest on a 10◦ ramp and is being held up by the force of static friction. What is the minimum coefficient of static friction between the box and the ramp to make sure that the box doesn't slip?arrow_forward
- A football coach sits on a sled while two of his players build their strength by dragging the sled across the field with ropes. The friction force on the sled is 1400 N and the angle between the two ropes is 50 ●. Assume both players pull with the same force. How hard must each player pull to drag the coach at a steady 2.0 m/s?arrow_forwardA 40kg box is initially sitting at rest on a horizontal floor with a coefficient of static friction μs=0.4. A horizontal pushing force is applied to the box. What is the maximum pushing force that can be applied without moving the box?arrow_forwardBOGART IS AN ADVENTUROUS MAN. HE WANTS TO CROSS THE 12-FT PLANK, WHICH COEFFICIENT OF FRICTION AT THE CONTACT POINTS A AND B IS µs = 0.4. AT WHAT DISTANCE x WILL BOGART START TO REALIZE THAT NOT EVERYTHING IN LIFE IS AN ADVENTURE (HE WILL REALIZE THE PLANK WILL SLIP!). ASSUME BOGART'S WEIGHT AS 85 LB. В 45° 15° 60°arrow_forward
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