A rope is used to pull a metal box 15 m across the floor in 34 seconds. The rope is held at an angle of 45 o with the floor and a force of 628 N is used. How much work does the force on the rope do? How much power is consumed? How efficiently is the force being applied to move the metal box? Unit 3: Engineering Design Get out last night’s Homework assignment
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A rope is used to pull a metal box 15 m across the floor in 34 seconds. The rope is held at an angle of 45 o with the floor and a force of 628 N is used.
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A rope is used to pull a metal box 15 m across the floor in 34 seconds. The rope is held at an angle of 45o with the floor and a force of 628 N is used. How much work does the force on the rope do? How much power is consumed? How efficiently is the force being applied to move the metal box?
Unit 3: Engineering Design
Get out last night’s Homework assignment
Topics Covered
1. Force, Energy, Work, Power, and Efficiency2. Topics in Mechanical Engineering3. Topics in Electrical Engineering4. Engineering Design Process5. Teams and Projects6. PROJECT: Mechanically Controlled Electromagnetic Crane
Unit 3: Engineering Design
1. A rope is used to pull a metal box 10 m across the floor in 30 seconds. The rope is held at an angle of 60o with the floor and a force of 600 N is used. How much work does the force on the rope do? How much power is consumed? How efficiently is the force being applied to move the metal box?
2A. How much work is required to lift a 50 N box to a height of 3 m?
2B. What is the gravitational potential energy of the box once it has been lifted?
2C. If the box is dropped from that height, how fast is it travelling when it hits the ground?
Unit 3 Quiz 1 – 12/01/10Use the Problem Solving Process to Solve and show all work:
1. Machines:1. Devices that use energy to transmit power, force, or motion2. Input and Output
2. Simple Machines:1. Devices that transform the direction or magnitude of a force
without consuming additional energy2. 6 simple machines:
2. Principle of the Lever:1. Static Equilibrium Demonstration
1. SF = 0 – Sum of Forces equals 02. SM = 0 – Sum of Moments equals 0
2. F x dF = L x dL
LEVERS
2nd Class
3rd Class
LEVERS
1. A 1380-kg car is sitting on a hill in neutral. The angle the hill makes with the horizontal is 30o. The distance from flat ground to the car is 200 m. What is the potential energy of the car? How efficient is the force of gravity being applied to the vehicle? What is the work done on the car by gravity? What is the kinetic energy of the car when it reaches the bottom of the hill? What is the velocity of the car when it reaches the bottom of the hill?
2. The manager of a theater knows that 900 tickets were sold for a certain performance. If orchestra tickets sold for $3 each and balcony tickets for $2 each, and if the total receipts were $2300, how may of each kind of ticket were sold?
3. The sum of the digits of a number is 9. If the digits are reversed, the number is increased by 45. What is the original number?
TEST TOMORROWTEST TOMORROWTopics:Topics:
1.1. Types of Communication TechnologyTypes of Communication Technology
2.2. Technical Drawing Types (distinguish between them)Technical Drawing Types (distinguish between them)
3.3. Draw Isometric drawing on Iso graph paperDraw Isometric drawing on Iso graph paper