Efficiency
if
the power supplied to the motor
efficiency
finally
the potency is equal to
where:
energy is equal to the potential energy
time
mass expression
evaluating numerically
A 100-watt motor (60% efficient) is available to raise a load 5 meters into the air....
A 5-horsepower, 75% efficient motor is used to raise a container 10 meters on the planet Mars, where gravitational acceleration is 3.711 meters per second squared. If the container is full of bromine (Br2), which has a specific gravity of 3.12 and has a total volume of 15 liters, how long does it take the motor to accomplish the task in units of seconds?
5. A load of 4 slugs is attached to a rope that runs over a pulley at the top of a building 100 ft. high. If a man is able to raise this load to the top of the building in 1 min, find the average power (in watt) required. 6, A 4,000 # car is at an incline that makes an angle of 15° with the horizontal. It is moving upward at constant speed 60 mph against a frictional...
5. The standard SI units of mass, time and length respactivey are b) kilograms, seconds, meters a) grams, seconds, meters c) meters, seconds, kilograms mJ4)stu,scomds,fet 6. A square piece of aluminium with as mass of 5.4g has a length of 2 cm and a thickness of 5 mm. What is the density of the piece of aluminium in V OFF 7. A ball is thrown into the air with a velocity of Sm/s from long does it take the ball...
5. The standard SI units of mass, time and length respactivey are a)grams, seconds, meters c) meters, seconds, kilograms b) kilograns, seconds, meters d) shugs, seconds, feet 6. A square piece of aluminium with as mass of 5.4 g has a length of 2 cm and a thickness of 5 mm. What is the density of the piece of aluminiun in 7. A ball is thrown into the air with a velocity of Sm/s from on top of a 36...
5. A 208-V four-pole 60-Hz Y-connected wound-rotor induction motor is rated at 30 hp. Its equivalent circuit components are R=0.100 Ry=0.070. X - 10.00 R = 250 X; -0.2100 X=0.21002 Praw=500 W P =0.5% of input at full load For a slip of 0.05, find (a) The line current (b) The induced voltage in the rotor (c) The stator power factor (d) The rotor power factor (e) The rotor frequency (f) The stator copper losses (g) The core loss (h)...
PART I: Multiple Choice Write all answers to the following questions. No partial credit available. Consumption utility is composed of price and convenience. True or False? A firm reduces inefficiencies by making trade-offs. True or False? A firm can increase its profitability by: A. increasing costs and reducing price. B. moving away from the efficient frontier. C. increasing inefficiencies. D. reducing inefficiencies. Operations comes from the Latin word "opus," which means: A. activity. B. helping people. C. improvement. D. work....
answer the following multiple choice questions
5. The most common phase serving . residence would be single phase bwo or double phase three phase multiple phases none of the answers provided RV9,1110 11. A KVA code letter indicates the innush current per hp. size of the short circult protectors size of the overcurrent protectors size of the thermal overloads none of the answers provided 6. RPM is the approximate speed under full-Hoad conditions when voltage is at rated value when...
1. A car, travelling at 30m/s slows to 10m/s in 5 seconds. What was the acceleration? A). -6 m/s B) 4m/s C).-2 m/s D). -9.8m/s 2. A ball thrown straight up takes 3 seconds to reach its maximum height. The height is most nearly B). 45m C). 60m D), 90 m A). 30m 3. A driver of a car wishes to pass a truck on the highway. Her car can accelerate at a constant 5m/s'. How long does it take...
10:23 AM Mon Jun 22 100% Review 1.pdf Review 1.pdf 1 of 5 Review 1 1. Draw a Venn diagram for a universe "People" with subsets "Hair Styles" and "Dreadlocks". For extra practice, think of where each of these people would go: Bob Marley, Lloyd Christmas, and Mr. Clean. 2. Draw a Venn diagram for a universe "People" with subsets "Men" and "Dreadlocks". Why is this Venn Diagram different than Problem I? 3. The three main Venn diagrams you studied...
4. Columns is a video game available on the Sega Gen- esis system. In the flashing version of the game, the player attempts to capture a flashing block in the bottom row of the screen as quickly as possible. The game may be played at levels 2 through 9. The level denotes the number of complete rows of blocks on the screen at the beginning of the game. For example at level 2 the player must break through the second...