Problem 5.7 13 of 16 Constants | Periodic Table A 27 kg box is released on a 23 ° incline and accelerates down the incline at 0.30 m/s?. Part A Find the friction force impeding its motion. Express your answer using two significant figures. ΑΣφ Fir = Request Answer Submit Part B What is the coefficient of kinetic friction? Express your answer using two significant figures. Hν ΑΣφ Hk =

Problem 5.7 13 of 16 Constants | Periodic Table A 27 kg box is released on a 23 ° incline and accelerates down the incline at 0.30 m/s?. Part A Find the friction force impeding its motion. Express your answer using two significant figures. ΑΣφ Fir = Request Answer Submit Part B What is the coefficient of kinetic friction? Express your answer using two significant figures. Hν ΑΣφ Hk =

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter7: Gravity

Section: Chapter Questions

Problem 2PQ

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I was given this problem, and I don't really know what to do about the fact that the normal force doesn't equal the weight for this problem. How am I supposed to find the kinetic friction coefficient now? A box of mass 2,463g is on level ground being pulled by a force of 6.41N at angle 47.2 above horizontal. If the block is moving with a constant velocity, what is the kinetic friction coefficient? (Hint: the normal force does not always equal the weight; it does not in this case.)
The engine of a 1,279 kg car provides a forward directed force of 5,392 N. If the car accelerates at a rate of 3.4 m/s2 what is the total resistive force (wind resistance, friction, etc.) acting on the car? Express your answer in N
A small box is released from rest at the top of a frictionless inclined plane as shown in (Figure 1). The horizontal surface at the base of the plane is rough and has a coefficient of kinetic friction μk�k = 0.3. If H� = 20 mm, how far does the box slide on the rough surface before coming to rest, d�?
Please help thanks! (a) When rebuilding his car's engine, a physics major must continuously exert 3.74 ✕ 102 N of force to insert a dry steel piston as it slides into a steel cylinder. What is the normal force (in N) between the piston and cylinder? (Enter the magnitude.) I ALREADY SOLVED A AND GOT: 1246.67N. AND IT WAS CORRECT. NEED HELP WITH B. (b) What force (in N) would he have to continuously exert if the steel parts were oiled? (Enter the magnitude.)
1 (a) Find the normal force exerted on a 2.9-kg book restingon a surface inclined at 36° above the horizontal. (b) If the angleof the incline is reduced, do you expect the normal force to increase, decrease, or stay the same? Graph and Explain.
A 1,040-N crate is being pushed across a level floor at a constant speed by a force F of 400 N at an angle of 20.0° below the horizontal. (a) What is the coefficient of kinetic friction between the crate and the floor? (Enter your answer to at least three decimal places.) (b) If the 400-N force is instead pulling the block at an angle of 20.0° above the horizontal, as shown in the figure b, what will be the acceleration of the crate? Assume that the coefficient of friction is the same as that found in part (a).
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Researchers have found that a gecko’s foot iscovered with hundreds of thousands of small hairs (setae) thatallow it to walk up walls and even across ceilings. A single foot pad,which has an area of 1.0 cm2, can attach to a wall or ceiling with aforce of 11 N. (a) How many 250-g geckos could be suspended fromthe ceiling by a single foot pad? (b) Estimate the force per squarecentimeter that your body exerts on the soles of your shoes, andcompare with the 11 N>cm2 of the sticky gecko foot.
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A 1,380-N crate is being pushed across a level floor at a constant speed by a force F of 320 N at an angle of 20.0° below the horizontal, as shown in the figure a below. a) What is the coefficient of kinetic friction between the crate and the floor? (Enter your answer to at least three decimal places.)(b) If the 320-N force is instead pulling the block at an angle of 20.0° above the horizontal, as shown in the figure b, what will be the acceleration of the crate? Assume that the coefficient of friction is the same as that found in part (a).m/s2
1. A drag-racing car accelerates forward because of the forceexerted on it by the road. Why, then, does it need an engine?Draw and Explain.
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