While moving into his new apartment, Miguel decides to tie a rope to one of his moving boxes (m = 62 kg) and drag it across the floor with constant speed instead of carrying it. The rope is parallel to the ground as he pulls, and the coefficient of friction between the box and the floor is μ = 0.40. If he drags the box at a constant speed of 1.5 m/s, then what is his power output? If the floor were frictionless, then what power output would be needed to keep the box moving at 1.5 m/s? Try to answer this one conceptually (no calculations) by making use of Newton's first law. Suppose that Miguel pulls the rope so that it makes a slight angle below the horizontal, with the box still maintaining the same speed of 1.5 m/s as before. Will this require an increase or a decrease in his power output? (Hint: what effect does angling the rope downward have on the friction force the box experiences?)

While moving into his new apartment, Miguel decides to tie a rope to one of his moving boxes (m = 62 kg) and drag it across the floor with constant speed instead of carrying it. The rope is parallel to the ground as he pulls, and the coefficient of friction between the box and the floor is μ = 0.40. If he drags the box at a constant speed of 1.5 m/s, then what is his power output? If the floor were frictionless, then what power output would be needed to keep the box moving at 1.5 m/s? Try to answer this one conceptually (no calculations) by making use of Newton's first law. Suppose that Miguel pulls the rope so that it makes a slight angle below the horizontal, with the box still maintaining the same speed of 1.5 m/s as before. Will this require an increase or a decrease in his power output? (Hint: what effect does angling the rope downward have on the friction force the box experiences?)

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Similar questions

A block of mass 10 kg rests on a horizontal floor. The acceleration due to gravity is 9.81 m/s2. The coefficient of static friction between the floor and the block is 0.2. A horizontal force of 10 N is applied on the block as shown in the figure. The magnitude of force of friction (in N) on the block is 10 N 10 kg
An electric motor that is 98% efficient runs off of a 100 W power supply. What is the maximum speed the motor could lift a 10 kg mass straight up? What is the maximum speed the motor could move the 10 kg mass across a frictionless surface? (This second question can only be answered in terms of the force that the motor applies to the mass. So, I should have added something like: Assume the electric motor is attached to the mass by a cable that has a maximum force tension of 3 kN.)
A 25-kg block shown in the figure rests on a rough surface having a coefficient of kinetic friction of µk = 0.25. A variable force F = (50 +s2) N, where s is in m, acts on the block that will result to spring compression. Determine the power developed (in kW and hp) by the force the instant the block has moved s = 1 m. Assume that the spring is originally unstretched (s = 0) and the block is at rest
During the packaging process, a can of soda of mass m = 0.4 kg moves down a surface inclined 20° relative to the horizontal, as shown in the figure below. The difference between the initial height of the can and the final height of the can is dz = 2 m. The can is acted upor by a constant force R parallel to the incline and by the force of gravity. The magnitude of the constant force R is 0.05 N. Ignoring friction between the can and the inclined surface, determine the can's change in kinetic energy, in J, and whether it is increasing or decreasing. Let g= 9.8 m/s². Initial location m R = 0.05 N Final location dz 20°
A 100-lb block is pushed at constant speed for a distance of 20 ft along a level floor by a force that makes an angle of 35° with the horizontal, as shown in Fig. The coefficient of friction between the block and the floor is 0.35. Determine The work done on the block by gravity. F 35°
A horizontal force of 300 lbs pushes a 200lb block up an incline whose slope is 3 vertical to horizontal. If the coefficient of friction is 0.2 determine the time required to increase the velocity of the block from 10 to 50 feet per second.
A 85-kg man starts climbing a ladder that leans against a wall as shown in Figure Q1. If the ladder is 5 m long and weighs 10 kg. Determine how far up the ladder the man can climb (in m) before the ladder starts to slip if the coefficient of friction is 0.25 at the top vertical surface and 0.4 at the bottom horizontal surface.
An inclined plane at an angle of 15o is used to lift a 250 kg sofa through a vertical height of 5 meters. If the coefficient of kinetic friction is 0.12, what is the Mechanical Advantage, Ideal Mechanical Advantage, and efficiency of the plane?
This is from Chapter 10 of Sustainable Energy second edition by Richard Dunlap Two locations have the same average wind velocity. Location A has a constant wind velocity of 10 m/s, while Location B has a wind velocity of 5 m/s for 12 hours per day and a wind velocity of 15 m/s for 12 hours per day. Compare the total energy produced per day for identical wind turbines at the two locations. The energy is given by the formula E = 0.5*(air density)*(efficiency)*velocity^3*(Turbine area)*time. Keep the answer in terms of (efficiency)*(Area). **Also is v average velocity or regular, non-average velocity?***