Physics for Scientists and Engineers, Vol. 1
6th Edition
ISBN: 9781429201322
Author: Paul A. Tipler, Gene Mosca
Publisher: Macmillan Higher Education
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Chapter 7, Problem 88P
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The rated power of motor.
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Compute the minimum power necessary to operate aski lift that carries skiers along a 45.0 slope. The liftcarries 100 skiers of average weight 700 N at any onetime, at a constant speed of 5.00 m/s.
A 13.8 kg crate is pulled up a rough inclinewith an initial speed of 1.5 m/s. The pullingforce is 123.0 N parallel to the incline, whichmakes an angle of 13.6◦ with the horizontal.
The coefficient of kinetic friction is 0.33 andthe crate is pulled a distance of 7.8 m.The acceleration of gravity is 9.81 m/s^2a) Find the work done by Earth’s gravityon the crate.Answer in units of J.b) Find the work done by the force of frictionon the crate.Answer in units of J.c) Find the work done by the puller on thecrate.Answer in units of J.d) Find the change in kinetic energy of thecrate.Answer in units of J.
e) Find the speed of the crate after it is pulled7.8 m.Answer in units of m/s.
(a) The Eskimo a 50.0-kg sled over level ground with a force of 1.80 102 N exerted horizontally, moving it a distance of 6.30 m over new terrain. If the net work done on the sled is 1.90 102 J find the coefficient of kinetic friction.(b) Repeat the exercise with the same data, finding the coefficient of kinetic friction, but assume the applied force is upwards at a 35.0° angle with the horizontal.
Chapter 7 Solutions
Physics for Scientists and Engineers, Vol. 1
Ch. 7 - Prob. 1PCh. 7 - Prob. 2PCh. 7 - Prob. 3PCh. 7 - Prob. 4PCh. 7 - Prob. 5PCh. 7 - Prob. 6PCh. 7 - Prob. 7PCh. 7 - Prob. 8PCh. 7 - Prob. 9PCh. 7 - Prob. 10P
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- Calculate the power output needed for a 950-kg car to climb a 2.00 slope at a constant 30.0 m/s while encountering wind resistance and friction totaling 600 N.arrow_forwardSuppose that the sled plus passenger of the preceding problem is pushed 20 m across the snow at constant velocity by a force directed 30 below the horizontal. Calculate (a) the work of the applied force, (b) the work of fiction, and (c) the total work.arrow_forwardA certain automobile engine delivers 2.24 104 W (30.0 hp) to its wheels when moving at a constant speed of 27.0 m/s ( 60 mi/h). What is the resistive force acting on the automobile at that speed?arrow_forward
- A cyclist in a race must climb a 5 hill at a speed of 8 m/s. If the mass of the bike and the biker together is 80 kg, what must be the power output of the biker to achieve the goal?arrow_forwardIf the net work done by external forces on a particle is zero, which of the following statements about the particle must be true? (a) Its velocity is zero. (b) Its velocity is decreased. (c) Its velocity is unchanged. (d) Its speed is unchanged. (e) More information is needed.arrow_forwardA 537-kg trailer is hitched to a truck. Find the work done by the truck on the trailer in each of the following cases. Assume rolling friction is negligible. a. The trailer is pulled at constant speed along a level road for 2.30 km. b. The trailer is accelerated from rest to a speed of 88.8 km/h. c. The trailer is pulled at constant speed along a road inclined at 12.5 for 2.30 km.arrow_forward
- A cart is pulled a distance D on a flat, horizontal surface by a constant farce F that acts at an angle with the horizontal direction. The other forces on the object during this time are gravity (Fw) , normal forces (FN1) and (FN2) , and rolling frictions Fr1 and Fr2 , as shown below What is the work done by each force?arrow_forwardEngineers desire to model the magnitude of the elastic force of a bungee cord using the equation F(x)=a[x+9m9m( 9m x+9m)2] , where x is the stretch of the cord along its length and a is a constant. If it takes 22.0 kJ of work to stretch the cord by 16.7 m, determine the value of the constant a .arrow_forwardConsider a particle on which a force acts that depends on the position of the particle. This force is given by . Find the work done by this force when the particle moves from the origin to a point 5 meters to the right on the x-axis.arrow_forward
- As a young man, Tarzan climbed up a vine to reach his tree house. As he got older, he decided to build and use a staircase instead. Since the work of the gravitational force mg is path Independent, what did the King of the Apes gain in using stairs?arrow_forwardCite two examples in which a force is exerted on an object without doing any work on the object.arrow_forwardCheck Your Understanding Estimate the power expended by a weightlifter raising a 150-kg barbell 2 m in 3 s.arrow_forward
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