Elements Of Electromagnetics
7th Edition
ISBN: 9780190698614
Author: Sadiku, Matthew N. O.
Publisher: Oxford University Press
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Transcribed Image Text:Machines-3. x
36qycDtil2k1AXMqTaZ4VgBpxj6cEROXWIQ/edit
Lhe amount o VWOIK UDameu nO a maCHne is diways iess tan LTIE WOIK put . TIS IS DEcause Some of
the work is lost due to friction. The efficiency of a machine can be calculated using the formula:
Percent Efficiency
Work output (Waur X
Work input (W)
100
1. A man expends 100J of work moving a box up an inclined plane. The amount of work produced is 80J.
What is the efficiency?
2. A box weighing 100 Newtons is pushed up an inclined plane that is 4 meters long, It takes a force of 75
Newtons to push it to the top, which has a height of 3 meters. What is the efficiency?
3. Using a lever, a person applies 60 Newtons of force and moves the lever 1 meter. This moves a 200
Newton rock at the other end of the rock .2 meters. What is the efficiency?
4. A person in a wheelchair exerts a force of 25 Newtons to go up a ramp that is 10 meters long. The
weight of the person and the wheelchair is 60 Newtons and the height of the ramp is 3 meters. What is
the efficiency?
5. A boy pushes a lever down 2 meters with a force of 75 Newtons. The box at the other end weighs 50
Newtons and moves up 2.5 meters. What is the efficiency?
6. A pulley system operates with 40% efficiency. If the work put in is 50J, how much useful work is
produced?
Compound (or Complex) Machines
Compound machines are a collection of simple machines working together. Compound machines are the
most common type of machine and do more complex work than individual simple machines. They
perform more work and therefore offer a greater advantage than simple machines alone. Compound
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- a) A fan is installed in a residential building to provide proper ventilation. This fan is connected to a duct with 11.6 cm diameter and provides the average air velocity of 5 m/s. By regulation, the minimum fresh air requirement is specified to be 0.35 air changes per hour (ACH) which means 35% of the entire air contained in a room should be replaced by fresh outdoor air every hour. Determine: House 0.35 ACH 200 m² Figure Q2a i. The flow capacity of the fan in litres/min ii. What the height of the residential building should be.arrow_forwardA free hanging system of 5 kg weight, and 6 kg weight, tied together with a 4 kg rope is pulled upwards with a force of 300 N. A) what is the acceleration of the system? B) what is the tension of the system? C) what is the tension from the middle of the rope ?arrow_forwardA canister of sevoflurane, an inhaled anesthetic, is warmed to room temperature over the course of 30 minutes. As the gas warms, it pushes on a movable piston with a force of 623 mN, increasing the volume of the gas by 16 cm^3. How much work was done by the gas? A. 0.03 CJ B. 0.27 CJ C. 2.7 CJ D. 270 CJarrow_forward
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