rate of 3000 rpm.8. A ski lift has a one-way length of 1 km and a vertical rise of 200 m. The chairs are spaced 20m apart, and each chair can seat three people. The lift is operating at a steady speed of 10km/h. Neglecting friction and air drag and assuming that the average mass of each loadedchair is 250 kg, determines the power required to operate this ski lift. Also estimate thepower required to accelerate this ski lift in 5 s to its operating speed when it is first turnedon.

Answered: 8. A ski lift has a one-way length of 1…

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

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Ex.8. A crate of mass 10.0 kg is pulled up a rough incline with an initial speed of 1.50 m/s. The pulling force is 10ON parallel to the incline, which makes an angle of 20.0° with the horizontal. The coefficient of kinetic friction is 0.400, and the crate is pulled 5.00m. (a) How much work is done by gravity? (b) How much energy is lost due to friction? (c) Hemuch work is don the change in wietic energy of the crate? (e) What is the speed of the crate after being pulled 5.00m? 5.00 m = 110° 70° 20° 20° F (a) (b)
A body of mass 10 kg is initially stationary on a 45 degree inclined plane , coefficient of friction is 0.5. The body slides down the plate and attains a velocity of 20 m/s. Find out distance travel by the body along the plane.
A carton is given a push across a horizontal surface. The carton has a mass m, the push gives it an initial speed of 2.30 m/s, and the coefficient of kinetic friction between the carton and the surface is 0.145. (a) Use energy considerations to find the distance (in m) the carton moves before it stops. (b) What If? Determine the stopping distance (in m) for the carton if its initial speed is doubled to 4.60 m/s. m
.A flywheel rim which weighs 822 pounds has a mean diameter of 44 inches. The speed is to be maintained between 90 and 130 rpm. Calculate capacity of the flywheel in ft-lbf. Assume density of rim material as 7250 kg/m3. (Hint: Be careful of units and divide the answer by g=32.2 ft/s2 to obtain ft-lbf)
A man pulls up box of mass 70kg using an inclined plane of effective length 5m onto a platform 2.5m high at uniform speed. If the frictional force between the box and the plan is 100N draw the diagram of all the forces acting on the box when in motion and calculate the (a) minimum effort applied in pulling up the box (b) velocity ratio of the plane (c) machanical advantage of the plane
A bus of mass 800 kg is travelling witha speed of 8 m/s. What will be the momentum of the bus.
A chair lift is to be installed from the surface down to a depth of 150 m. The inclination is 17 degrees to the horizontal. An operating velocity is to be used, and the system will be required to transport 300 persons per hour. Assuming the worst-case scenario, namely that no persons travel down while the system has a full load traveling up, determine: 1. the spacing of thr chairs 2. the traveling time per person 3. the output power of the motor required to drive the system Perfomance criteria: A force criteria: A force of 2 kN per 100 m of the length of the loaded part of the system is required to overcome friction. Mass per person: 70 kg Overall mechanical efficiency: 85%
A car delivers 160 hp to a winch used to raise a load of 1260 kg . Determine the maximum speed of lift.
A 3-bladed wind turbine with 250 kW generator has diameter of 50 m and tower height of 60 m. It is designed to have Cp of 0.25 at wind speed of 12 m/s when regulation starts. The cut-in and furling Speeds for the machine are 5 m/s and 20 m/s respectively. Mechanical and electrical efficiencies are 90 % and 95 %. By assuming the density of air as 1.225 kg/m3. Calculatea. What is power developed by the rotor at 12 m/s when regulation starts? b. If the tip-speed ratio at this wind speed is 4.2, then what is the rpm of the rotor? c. Calculate the actual torque developed. d. Calculate the maximum possible annual power output.
A 5 lbm object is moving at a speed of 10 fps^2 at an elevation of 30 ft above the sea level ground. Calculate the weight of the object and its potential and kinetic energies.
Consider an automobile with a mass of 5500 lbm braking to a stop from a speed of 55 miles/h.(a) How much energy (Btu) is dissipated as heat by the friction of the braking process?(b) Suppose that throughout the United States, 300,000,000 such braking processes occur in the course of a given day. Calculate the average rate (megawatts) at which energy is being dissipated by the resulting friction.(c) Find a source of information on the average per-capita consumption of electricity (kW) in the United States, France, and India. Roughly how many people in each country would have their electricity needs met if the braking energy calculated in Part (b) could be recovered and used to provide electricity? Show your calculations and identify your information source.
A 10 kg block is moving on a horizontal table. The coefficient of kinetic friction between them is 0.3. What is the frictional force acting upon the block?

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