A 79.6 kg base runner begins his slide into second base while moving at a speed of 4.1 m/s. The coefficient of friction between his clothes and Earth is 0.64. He slides so that his speed is zero just as he reaches the base.

A 79.6 kg base runner begins his slide into second base while moving at a speed of 4.1 m/s. The coefficient of friction between his clothes and Earth is 0.64. He slides so that his speed is zero just as he reaches the base.

Physics for Scientists and Engineers, Technology Update (No access codes included)

9th Edition

ISBN:9781305116399

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter7: Energy Of A System

Section: Chapter Questions

Problem 7.15OQ: A cart is set rolling across a level table, al the same speed on every trial. If it runs into a...

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Review. A 3.00-kg block starts from rest at the top of a 30.0 incline and slides a distance of 2.00 m down the incline in 1.50 s. Find (a) the magnitude of the acceleration of the block, (b) the coefficient of kinetic friction between block and plane, (c) the friction force acting on the block, and (d) the speed of the block after it has slid 2.00 m.
A cart is set rolling across a level table, at the same speed on every trial. If it runs into a patch of sand, the cart exerts on the sand an average horizontal force of 6 N and travels a distance of 6 cm through the sand as it comes to a stop. It instead the cart runs into a patch of gravel on which the can exerts an average horizontal force of 9 N, how far into the gravel will the cart roll before stopping? (a) 9 cm (b) 6 cm (c) 4 cm (d) 3 cm (e) none of those answers
In most situations we have encountered in this chapter, frictional forces tend to reduce the kinetic energy of an object. However, frictional forces can sometimes increase an objects kinetic energy. Describe a few situations in which friction causes an increase in kinetic energy.
A toy cannon uses a spring to project a 5.30-g soft rubber ball. The spring is originally compressed by 5.00 cm and has a force constant of 8.00 N/m. When the cannon is fired, the ball moves 15.0 cm through the horizontal barrel of the cannon, and the barrel exerts a constant friction force of 0.032 0 N on the ball. (a) With what speed does the projectile leave the barrel of the cannon? (b) At what point does the hall have maximum speed? (c) What is this maximum speed?
Two blocks, A and B (with mass 50.0 kg and 1.00 102 kg, respectively), are connected by a string, as shown in Figure P5.86. The pulley is frictionless and of negligible mass. The coefficient of kinetic friction between block A and the incline is k = 0.250. Determine the change in the kinetic energy of block A as it moves from to , a distance of 20.0 m up the incline (and block B drops downward a distance of 20.0 m) if the system starts from rest. Figure P5.86
(a) Calculate the force needed to bring a 950-kg car to rest from a speed of 90.0 km/h in a distance of 120 m (a fairly typical distance for a non-panic stop). (b) Suppose instead the car hits a concrete abutment at full speed and is brought to a stop in 2.00 m. Calculate the force exerted on the car and compare it with the force found in part (a).
43. A block of mass m slides from rest down an inclined plane of length s and height h. If F is the magnitude of the force of kinetic friction acting on the block as it slides, then the kinetic energy of the block when it reaches the bottom of the incline will be equal to mgh mgs - Fh mgh - Fs mgs - Fs
A hockey puck is given an initial speed of 4.8 m/s If the coefficient of kinetic friction between the puck and the ice is 0.05, how far does the puck slide before coming to rest? Solve this problem using conservation of energy.Express your answer with the appropriate units.
Part 1. A 3 kg package of tamales (see the figure below) slides along a floor with speed v1 = 5 m/s. It then runs into and compresses a spring, until the package momentarily stops. Its path to the initiallyrelaxed spring is frictionless, but as it compresses the spring, a kinetic frictional force from the floor, of magnitude 15 N, acts on the package. If k = 8 000 N/m, by what distance d is the spring compressed when the package stops? What makes up the system in this problem and state a reasonable assumption about this system? Consider the following for a rotational motion:r = 6 m, θ = 0.5t2, where t is in seconds and θ is in radians.Find the magnitudes of (a) tangential acceleration at t = 4 s, and (b) radial acceleration at t = 4 s.[1+1]
Sam, whose mass is 80 kgkg , takes off across level snow on his jet-powered skis. The skis have a thrust of 160 NN and a coefficient of kinetic friction on snow of 0.10.1. Unfortunately, the skis run out of fuel after only 15 ss . What is Sam's top speed? Express your answer to two significant figures and include the appropriate units. How far has Sam traveled when he finally coasts to a stop? Express your answer to two significant figures and include the appropriate units.
Question 5: a. (i) Give an example of an object that has three forces acting on it, and (1) accelerates, (2) moves atconstant (nonzero) velocity, and (3) remains at rest. (ii) In terms of work done distinguish betweenconservative and non-conservative force.b. The drawing shows a sulfur dioxide molecule, SO2. It consists of two oxygen atoms and a sulfuratom. A sulfur atom is twice as massive as an oxygen atom. Using this information and the dataprovided in the drawing, find the center of mass of the sulfur dioxide molecule. Express youranswers in nanometers (1 nm = 10_9 m).
A 48.46-kg skier with an initial speed of vi=42.03 m/s coasts up a H=11.46-m-high rise. The slope angle is theta=66.8. What is her final speed at the top? Assume the coefficient of friction between her skis and the snow is 0.042 (Hint: Find the distance traveled up the incline assuming a straight-line path as shown in the figure.) Use g = 10 m/s2.