Sunday

April 20, 2014

April 20, 2014

Number of results: 2,240

**physics**

How long will it take a 1920 W motor to lift a 285 kg piano to a sixth-story window 16.0 m above?
*Monday, October 12, 2009 at 7:34pm by jerry*

**physics**

motor A lift a steel bar 5000N upward at a constant 2m/s. motor B lift 4000N steel bar upward at a constant 3m/s. which motor is supplying more power?
*Tuesday, February 26, 2013 at 8:12am by Anonymous*

**physics**

A 187 W motor will lift a load at the rate (speed) of 6.58 cm/s. How great a load can the motor lift at this rate?
*Tuesday, April 26, 2011 at 9:27pm by Merlin*

**Physics**

An electric motor is rated to have a maximum power output of 0.72 hp. If this motor is being used to lift a crate of mass 188 kg, how fast (i.e., at what speed) can it lift the crate? Hint: Assume the only other force on the crate is the force of gravity.
*Monday, May 28, 2012 at 11:53pm by Alex*

**physics**

How long will it take a motor 1500 watt motor to lift a 500kg elevator 30 meters? Give your answer in minutes.
*Sunday, February 26, 2012 at 4:12pm by Darcie*

**Physics**

A 900W motor is used to lift 275.51kg of bricks a distance of 30, to the roof of the building. a. If the motor ran for 90s how much work did it do? b. What is the potential energy of the bricks? I know how the calculate work, but I'm really confused about how to calculate it ...
*Thursday, January 6, 2011 at 3:41pm by Jacie*

**college physics**

What distance will a 10 hp motor lift a 2000 lb elevator in 30 s? What was the average velocity of this elevator during the lift?
*Friday, November 11, 2011 at 10:00pm by Jessica*

**Physics**

(a).A 220-kg sleigh is pulled by one horse at constant velocity for 0.90 km on a snowy, horizontal surface, the coefficient of kinetic friction between the sleigh runners and snow is 0.27. What power must the horse deliver to the sleigh for the trip to take 9 minutes? (b) ...
*Saturday, October 24, 2009 at 9:16pm by Sandhu*

**Physics**

Your sofa won't fit through the door of your new sixth-floor apartment, so you use a 1.19 motor to lift the 88.6 sofa 18.3 from the street. How much time does the lift take?
*Wednesday, December 5, 2012 at 2:27pm by Amanda*

**physics ---- really dnt get this at all**

A small electric motor is used to lift a 0.50-kilogram mass at constant speed. If the mass is lifted a vertical distance of 1.5 meters in 5.0 seconds, the average power developed by the motor is
*Sunday, May 8, 2011 at 3:54pm by ashley --- HELP PLEASEE!!!*

**Pysics**

A small motor runs a lift that raises aload of bricks weighing 836N to a height of 10.7m in 23.2s. assuming that the bricks are lifted with constant speed, what is the minimum power the motor must produce?
*Monday, March 15, 2010 at 5:30pm by Cody*

**Physics**

A construction crew pulls up an 87.5-kg load using a rope thrown over a pulley and pulled by an electric motor. They lift the load 15.1 m and it arrives with a speed of 15.6 m/s having started from rest. Assume that acceleration was not constant. a. How much work (J) was done ...
*Tuesday, July 31, 2012 at 2:11pm by Anonymous*

**Physics**

A construction crew pulls up an 87.5-kg load using a rope thrown over a pulley and pulled by an electric motor. They lift the load 15.1 m and it arrives with a speed of 15.6 m/s having started from rest. Assume that acceleration was not constant. a. How much work (J) was done ...
*Tuesday, July 31, 2012 at 2:12pm by Anonymous*

**algebra**

The power (P) required to run a motor is equal to the voltage (E) applied to that motor times the current (I) supplied to the motor. If the motor data says the motor uses 180 watts of power and the voltage applied to the motor is 120 volts, how much current will the motor ...
*Monday, June 11, 2012 at 3:42pm by laquel*

**Physics**

container factory uses a 450 W motor to operate a conveyor belt that lifts containers from one floor to another. To lift 250 1-kg containers a vertical distance of 2.4 m, the motor runs for 45 s. What is the efficiency of the motorized conveyor system?
*Wednesday, July 18, 2012 at 7:12pm by Rob*

**Physics**

container factory uses a 450 W motor to operate a conveyor belt that lifts containers from one floor to another. To lift 250 1-kg containers a vertical distance of 2.4 m, the motor runs for 45 s. What is the efficiency of the motorized conveyor system?
*Wednesday, July 18, 2012 at 8:56pm by Rob*

**Science**

container factory uses a 450 W motor to operate a conveyor belt that lifts containers from one floor to another. To lift 250 1-kg containers a vertical distance of 2.4 m, the motor runs for 45 s. What is the efficiency of the motorized conveyor system?
*Wednesday, July 18, 2012 at 9:38pm by Jack Hill*

**Physics**

1. A 2.5kg rock is dropped from a 350m cliff. It hits the ground with a speed of 60 m/s. What percent of its mechanical energy was lost to air resistance? -the answer is 48% 2. A motor uses 5500J to lift a 35kg object a vertical distance of 12m. What is the efficiency of the ...
*Sunday, June 17, 2012 at 3:34am by lenny*

**Physics**

A construction crew pulls up an 87.5 kg load using a rope thrown over a pulley and pulled by an electric motor. They lift the load 15.5 m and it arrives with a speed of 15.6 m.s having started from rest. Assume that acceleration was not constant. How much work was done by the ...
*Friday, June 3, 2011 at 3:14pm by Casey*

**Physics**

A diagram represents a simplified sketch of an electric DC motor.which contains a magnet, commutator, carbon brushes, coil and a pivot. when the electric motor is connected to a 12V DC supply, it draws a current of 1,2A. The motor is now used to lift an object of mass 1,6kg ...
*Monday, October 11, 2010 at 5:24pm by READ ME PLEAZZ*

**physics**

A chair lift takes skiers to the top of a mountain that is 320 m high. The average mass of skiers complete with equipment is 85 kg . The chair lift can deliver three skiers to the top of the mountain every 36 s Determine the power required to carry out this task If friction ...
*Monday, April 30, 2012 at 6:33pm by Melissa*

**physics**

a mechanic uses a chain and bloc pulley to lift a 875-kg engine 4.0 m to the top of the garage. the downward force on the chain over the 4.0 m distance is 5.0 x 10^4 N. a)calculate the work done in raseing the motor b)how much useful work was done c)what is the inefficiency of...
*Saturday, January 12, 2013 at 3:24pm by tyler*

**science**

A 750w motor might also be rated as a 0.5horsepower motor 1 horsepower motor 2 horsepower motor 10 horsepower motor
*Monday, March 31, 2014 at 10:43pm by snow*

**physics**

A certain elevator car has mass 2200 kg and is lifted by cables driven by an electric motor. The efficiency of the lift system (motor, pulleys, cable, etc.) is 67.0%. As the elevator car moves at constant speed of 3.0 m/s it encounters 220N of friction coming from its tracks. ...
*Sunday, December 1, 2013 at 7:46pm by Bob*

**word problem**

Let x =the number of people who paid at the door 4(480-x)+5x=2100 Distribute 1920-4x+5x=2100 add like terms 1920-9x=2100 -1920-9x=2100-1920 -9x=180 Divide by nine x=-20 pe0ple at the door
*Saturday, October 21, 2006 at 11:06am by Katniss E.*

**word problem**

Let x =the number of people who paid at the door 4(480-x)+5x=2100 Distribute 1920-4x+5x=2100 add like terms 1920-9x=2100 -1920-9x=2100-1920 -9x=180 Divide by nine x=-20 pe0ple at the door
*Saturday, October 21, 2006 at 11:06am by Katniss E.*

**physics**

a40w motor conectedto a 9v battery can lift an object 40m in 10s
*Thursday, March 21, 2013 at 12:38am by jorge*

**physics-newton's laws**

change km/hr to m/s Look at a vector diagram. mg is down, lift is perpendicular to the tilt angle. You need to realize the vertical part of lift is equal to mg (so mg=Lift*sin40 That give you lift. Now, the portion of Lift keeping the plane accelerating inward is lift*cos40. ...
*Tuesday, October 12, 2010 at 8:07pm by bobpursley*

**physics**

A crane lifts a concrete hopper of mass 370 kg from the ground to the top of a 38 m building that is under construction. The hopper moves with a constant speed during the lift. The power rating of the crane motor is 8.2 kiloWatts. How long does it take for the crane to lift ...
*Sunday, February 20, 2011 at 10:48pm by anonymous*

**Physics**

A mechanic uses a chain and block to lift a 875-kg engine 4.00 m to the top of the garage. The downward force in the chain over the 4.00 m distance is 5.00 x 10^4 N. A) Calculate the work done in raising the motor B) How much useful work was done? C) What is the efficiency of ...
*Thursday, January 16, 2014 at 4:18pm by Holly*

**Electricity**

A motor running at its rated power provides 2.6 lb-ft torque at its rated speed of 2020 rpm. The motor draws 5.6-A from a 230-V supply at a phase angle of 37 degrees. Determine the following: The horsepower delivered by the motor, The efficiency of the motor.
*Thursday, January 24, 2008 at 2:50pm by Nick*

**physics**

A small motor runs a lift that raises a load of bricks weighing 916 to a height of 12.7 in 28.2 .
*Monday, November 21, 2011 at 11:49pm by Anonymous*

**algebra**

Move 1920 to right side (making it negative 1920), combine the S terms (but you have made an error [the 1920-S should be 1920-8S)], and calculate S, then G. You have worked the problem as if G is the NUMBER of $8 tickets sold and S is the NUMBER of $5 tickets sold. That way G...
*Wednesday, December 26, 2007 at 8:57pm by DrBob222*

**physics**

How long will it take a 230 W motor to lift a 335 kg piano to a sixth-story window 19.0 m above?
*Sunday, February 28, 2010 at 2:07pm by peyli*

**Physics**

How long will it take a 1080 W motor to lift a 330kg piano to a sixth-story window 16.0m above?
*Monday, February 21, 2011 at 6:52pm by John*

**Physics**

How long will it take a 1080 W motor to lift a 330kg piano to a sixth-story window 16.0m above?
*Monday, February 21, 2011 at 6:50pm by John*

**Physics**

How long will it take a 1080 W motor to lift a 330kg piano to a sixth-story window 16.0m above?
*Monday, February 21, 2011 at 6:51pm by John*

**physics**

How long will it take a 1280 W motor to lift a 345 kg piano to a sixth-story window 19.0 m above?
*Monday, February 28, 2011 at 10:55pm by Kathleen*

**Physics**

How long will it take a 1830 W motor to lift a 285 kg piano to a sixth-story window 16.0 m above?
*Thursday, November 10, 2011 at 10:27pm by Kristy*

**physics**

How long will it take a 1030 W motor to lift a 330 kg piano to a sixth-story window 13.0 m above?
*Sunday, December 18, 2011 at 10:13am by ayyya*

**physics**

How long will it take a 1630 W motor to lift a 285 kg piano to a sixth-story window 16.0 m above?
*Tuesday, April 10, 2012 at 1:26pm by Amelia*

**More Algebra **

Eve and Jason have an exercise routine that they do together three days a week. Together, they can lift 225 pounds. a) If Eve can lift 113 pounds,how many pounds can Jason lift? b). If Eve can lift 87 pounds, how many pounds can Jason lift? c) What expression can be used to ...
*Sunday, October 2, 2011 at 5:22pm by Jab*

**Managerial Accounting**

a ski company plan to add five new chai500 a day for the lift. the lifts cost 2 million and to install the lift cost another 1.3 mil.The lift will allow 300 additional skiers on the slopes but only 40 days a year will be needed. The company will sell 300 lift tickets on those ...
*Sunday, August 23, 2009 at 8:37pm by Anita*

**physics**

You don't need the power rating of the motor to calculate the work required to lift one. It is W = M g H H = 38 m g = 9.8 m/s^2 M = 370 kg The answer will be in joules
*Sunday, February 20, 2011 at 8:16pm by drwls*

**Salisbury University**

How long will it take a 480 N motor to lift a 335 kg piano to a sixth-story window 15.0 m above?
*Wednesday, April 6, 2011 at 6:18pm by Cara*

**physics**

how long will it take a 1750-watts motor to a lift a 285-kg piano to a sixth storey window 1.6 meters above
*Friday, October 5, 2012 at 12:12pm by kyla*

**Geomatic Sequence**

ar^6 - ar^4=1920 64a-16a=1920 48a=1920 a = 40 sum(11) = 40(2^11 - 1)/(2-1) = 81880
*Monday, October 1, 2012 at 10:20am by Reiny*

**physics**

The electrical motor runs on a D.C source of emf E and internal resistance r. Show that power output of the motor is max where current drawn by the motor is E/2r.
*Tuesday, March 16, 2010 at 12:32pm by Edwin*

**science**

How long would it take a 20.0 hp motor to lift a 1,000.0 kg crate from the bottom of a freight's hole deck(40.0m)?
*Wednesday, October 10, 2007 at 12:42pm by Sarah*

**Physical Science**

How long would it take a 20.0 hp motor to lift a 1,000.0 kg crate from the bottom of a freighter's hold to the deck (40.0 m)?
*Wednesday, October 10, 2007 at 12:01am by ROSemary*

**physical science**

How long would it take a 20.0 hp motor to lift a 1,000.0 kg crate from the bottom of a freighter's hold to the deck (40.0 m)?
*Thursday, June 23, 2011 at 2:19pm by t*

**Physics**

The upward lift is constant, it depends only on the size of the balloon. netforce= mass*acceleration Lift-mg=m*a lift-g(m-deltam)=(m-deltam)*newacc 1)solve for lift in the original equation, knowing m, a, and g. 2) solve for deltamass in the second equation knowing lift, g, m...
*Wednesday, November 28, 2007 at 3:21pm by bobpursley*

**Physics**

The resistance of the wire in the windings of an electric starter motor for an automobile is 0.0190 Ohms. the motor is connected to a 12 V battery. What current will flow through the motor when it is stalled?
*Sunday, February 20, 2011 at 4:15pm by Kara*

**math**

1920/12 = 160 1920/8 = 240 Can you do anything with that?
*Wednesday, January 25, 2012 at 8:28am by Reiny*

**Geomatic Sequence**

that's geometric sequence T7 = T5*r^2 = T5+1920 r = 2, so 4*T5 = T5 + 1920 3T5 = 1920 T5 = 640 640 = 2^4 * 40 So, a=40 and the sequence is 40 80 160 320 640 1280 2560 5120 10240 20480 40960 ... Note that 2560 = 640 + 1920
*Monday, October 1, 2012 at 10:20am by Steve*

**Physics**

Please Help!!!: How many seconds will it take a 12hp motor to lift a 1500lb elevator at a distance of 9ft? what was the average velocity of the elevator?
*Sunday, October 17, 2010 at 11:33am by Aikawa*

**Physics**

An electric motor has 72 turns of wire wrapped on a rectangular coil, of dimensions 3cm by 4cm. Assume that the motor uses 14A of current and that a uniform 0.5T magnetic field exists within the motor. 1)What is the maximum torque delivered by the motor? Answer in units of Nm...
*Saturday, April 7, 2007 at 8:27pm by Belle*

**AP U.S. History 1920's immigration**

who were the immigrants in the 1920's
*Wednesday, February 21, 2007 at 11:12pm by kristina*

**physics**

A small motor draws a current of 1.76 A from a 110 V line. The output power of the motor is 0.20 hp. (a) At a rate of $0.060/kWh, what is the cost, in cents, of operating the motor for 4.0 h? (b) What is the efficiency of the motor? for (a) i am doing IV*hours*price and its ...
*Monday, March 14, 2011 at 7:02pm by julie*

**A & P**

Trace the anatomical pathway of the neural signal that must be sent from the primary motor area of the brain to the appropriate muscles of the arm and shoulder in order to lift a glass of water to drink.
*Wednesday, March 23, 2011 at 5:07pm by Anonymous*

**Physics - pulley**

A construction crew pulls up an 87.5-kg load using a rope thrown over a pulley and pulled by an electric motor. They lift the load 15.5 m and it arrives with a speed of 15.6 m/s having started from rest. Assume that acceleration was not constant. I have done the problem but am...
*Friday, June 3, 2011 at 12:08am by Casey*

**PHYSICS**

Using the motor principle explain why a motor is rotating in the direction indicated. I seriuosly have no idea, please help explain this theory to me. PHYSICS - drwls, Saturday, February 6, 2010 at 2:15pm To help you answer that question, I'd need a figure that shows what kind...
*Saturday, February 6, 2010 at 2:25pm by Sarah*

**physics**

I have to build a mini solar car for a school project and i have three solar cells that i bought. whenever i hook up the solar cells i get a reading between 1.5-1.8 volts, but when i hook it up to the motor it wont start it. According to the box the motor only requires 1.5v ...
*Sunday, May 6, 2007 at 2:44am by Matt*

**physics **

a 1.00 x 10 W electric motor is used to life a 955 kg object vertically 25.0 m at a constant velocity. How much time does it take to lift the object.
*Sunday, December 2, 2012 at 10:00am by Teresa*

**Physics**

(car lift on lift) -------------- ____---____ <- lift .........| | .........| | .........\ \__________________ ..........__________O_______....\ ....................................[....|....|.....] ................. ________________ ------------------^^^^^^^^^^^^^^^^ fluid...
*Wednesday, December 5, 2012 at 8:26am by Drake*

**science**

a) Power of the motor P = 3.8hp = (3.8hp)(746W/hp) = 2834.8W Motor is 90% efficient. Therefore Power absorbed by the motor is (2834.8W)/(0.9) =3150W But power P = V I then current in the motor I =(3150W)/(120V) = 26.25A (b) Energy delivered to the motor E = P*t = (3150W)(4h)(...
*Saturday, October 20, 2007 at 5:45pm by Anonymous*

**Physics**

Pic should be fixed below: (car lift on lift) -------------- ____---____ <- lift ...|...| ...|...| ...\...\__________________ ....__________O_______.....\ ..................[....|....|.....] ................. ________________ ------------------^^^^^^^^^^^^^^^^ fluid ...
*Wednesday, December 5, 2012 at 8:26am by Drake*

**Physics**

outside the sphere, E=kq/r^2 E=kQ/(r+2)^2=1920 E=kQ/4^2=3000 kq=16*3000 1920=16*3000/(r+2)^2 solve for r r = 4 sqrt (3000/1920)-2 check that math.
*Monday, February 4, 2013 at 12:37pm by bobpursley*

**Science**

A fixed, single pulley that is used to lift a block does which one of the following? A. doubles the force required to lift the block B. decreases the force required to lift the block C. makes the block easier to lift by changing the direction of the force needed to lift it D. ...
*Wednesday, April 10, 2013 at 10:15pm by Cassie*

**history/lit**

The 1920's is associated with the development of many new freedoms; it was a time of restrictions as well. Examine the 18th amendment and prohibition in the 1920's. What was the reasoning and who were the key supporters behind a 'dry' United States? ---Need help answering this...
*Monday, June 15, 2009 at 10:43pm by mysterychicken*

**algebra**

r = m (t) + b when year = 1920, t = 0 where t = year - 1920 45.9 = m (0) + b so b = 45.9 44.1 = m (1980-1920) + 45.9 44.1 = 60 m + 45.9 60 m = -1.8 m = -.03 so r =-.03 t + 45.9 when year = 2003 t = 2003 - 1920 = 83 r = -.03 (83) + 45.9 r = 43.41 that should get you started
*Sunday, December 20, 2009 at 5:18pm by Damon*

**Mechanics (Physics)**

A man of mass M kg and his son of mass m kg are standing in a lift. When the lift is accelerating upwards with magnitude 1ms-2 the magnitude of the normal contact force exerted on the man by the lift floor is 880N. When the lift is moving with constant speed the combined ...
*Wednesday, December 22, 2010 at 2:13pm by The Golden Girl *

**math (am i correct)**

Record = m (year -1920) + b where year -1920 = t so R = m t + b 46.9 = m (0) + b so b = 46.9 in 1990, t = 1990 - 1920 = 70 so 45.5 = m (70) + 46.9 m = -.02 so R = -.02 t + 46.9 for 2003 for example t = 2003 - 1920 = 83 so R = -.02(83)+46.9 R = 45.24
*Sunday, June 14, 2009 at 6:33pm by Damon*

**science**

Sasha wants to find the resistance of the motor. She measured a 6 V drop across the motor that is in a series circut with a 200 ohms reseistor. The power source is supplying 9 V to the circut. How musch resistance is her motor putting into the circut?
*Monday, February 18, 2008 at 7:24pm by Clover*

**science**

Question: If you have an electric motor on a bench and hook it to the power the shaft turns. If you put the shaft in a vise the casing of the motor will turn. Now:...put this motor in free space no gravity and attach a battery for power..when the power is turned on will the ...
*Monday, July 25, 2011 at 9:43pm by Tiffany*

**science**

the ski lift chair at a ski report is 2560m long. on average, the ski lift rises 15.2 degree above the horizontal. how high is the top of the ski lift relative to the base?
*Tuesday, October 23, 2012 at 1:34pm by Anonymous*

**physics**

A freely running motor rests on a thick rubber pad to reduce vibration. The motor sinks h=10 cm into the pad. Estimate the rotational speed in RPM (revolutions per minute) at which the motor will exhibit the largest vertical vibration.
*Monday, April 29, 2013 at 4:34am by kjhgkjhgkjhg*

**physics**

A freely running motor rests on a thick rubber pad to reduce vibration. The motor sinks h=10 cm into the pad. Estimate the rotational speed in RPM (revolutions per minute) at which the motor will exhibit the largest vertical vibration.
*Monday, April 29, 2013 at 4:38am by kjhgkjhgkjhg*

**physics**

A 120-V motor has mechanical power output of 2.20 hp. It is 92.0% efficient in converting power that it takes in by electrical transmission into mechanical power. (a) Find the current in the motor (A) (b) Find the energy delivered to the motor by electrical transmission in 2....
*Thursday, September 5, 2013 at 2:38pm by priya*

**Physics**

A man whose mass is 80kg stands on a weighing machine inside a lift: when the lift starts accelerating upwards, the reading of the weighing machine was observed to be 96kg. Determine the upward acceleration of the lift?
*Tuesday, April 16, 2013 at 2:27am by Musa Abdullahi*

**science**

a 12V , 3A motor takes 120 minutes to do a certain job. a 120V, 8A motor takes 5 minutes to do the same job. Which motor uses the least energy and by how much?
*Saturday, October 20, 2007 at 5:45pm by Anonymous*

**physics**

A 120-V motor has mechanical power output of 3.20 hp. It is 81.0% efficient in converting power that it takes in by electrical transmission into mechanical power. (a) Find the current in the motor. Answer: 24.6A (b) Find the energy delivered to the motor by electrical ...
*Monday, May 2, 2011 at 2:41am by iva*

**Algebra 1**

In 1920 the record for a certain race was 45.1 sec. In 1960, it was 44.3 sec Let R(t)-the records in the race(t)=the numbeer of years since 1920. Thank you for your help.
*Thursday, January 27, 2011 at 4:31pm by Esther*

**Math**

17.Which roller coaster has the greatest lift height Top Thrill Dragster 18.What is the median lift height for the roller coasters lifted? Round to the nearest tenth. Not sure for this one 19.Arrange the given roller coasters from least to greatest lift height -20,-8,0,16,60,...
*Tuesday, April 30, 2013 at 6:33pm by Jerald*

**physics**

a man has only 4 simple pulleys to lift a heavy load of 6000N. in roder to lift the load easily, he combines the pulleys (3 moveable, 1 fixed). given that the frictional forces are 300N, what force must he apply in order to lift the load?
*Thursday, September 2, 2010 at 9:55am by ashlee*

**Math/Science**

The electric motor that hauls our boats out of the water is 80% efficient. the power out of the motor needed to haul the boat at .1 meter per second is 16 thousand Watts. How much power must go into the motor from the electric cable in the street?
*Sunday, February 24, 2008 at 7:28pm by Damon*

**Physics**

A 1000kg elevator carries a maximum load of 800kg. A constant frictional force of 5000N retards the elevator's motion upward. What minimum power, in kilowatts, must the motor deliver to lift the fully loaded elevator at a constant speed of 3m/s?
*Saturday, December 10, 2011 at 2:18pm by Anonymous*

**Physics**

A motor does 5,000 of work in 20 seconds what is the power of the motor
*Tuesday, December 14, 2010 at 9:28am by Anonymous*

**AP Physics**

A cord runs around two massless, frictionless pulleys; a canister with mass m=20 kg hangs from one pulley; and you exert a force F if you are to lift the cord. a) What must be the magnitude of F if you are to lift the canister at a constant speed? b) To lift the canister by 2 ...
*Monday, December 14, 2009 at 9:32pm by Mikaela*

**Physics**

A motor vessel tows a small dinghy by a rope which makes an angle of 20 degrees with the horizontal. If the tension in the rope is 15 kgf ;find a) the force which effectively pulls the dinghy forward. b)the force which lift its bows out of the water.
*Monday, January 10, 2011 at 3:31am by Asamoah*

**Science**

A boy exerts a force of 15N to push a motor bike which has flat tyre for a distance at 30m.calculate the mass of the motor bike. Calculate the density of the motor bike.calculate the work done by the boy.[take g=10m|sm2
*Monday, May 14, 2012 at 3:36am by Nicholas*

**Science**

A boy exerts a force of 15N to push a motor bike which has flat tyre for a distance at 30m.calculate the mass of the motor bike. Calculate the density of the motor bike.calculate the work done by the boy.[take g=10m|sm2
*Monday, May 14, 2012 at 3:38am by Nicholas*

**science**

At time t =0, the current to the dc motor is reversed, resulting in an angular displacement of the motor shaft given by è = (198 rad/s)t – (24 rad/s2)t2 – (2 rad/s3)t3 (15 marks) a. At what time is the angular velocity of the motor shaft zero? b. Calculate the angular ...
*Saturday, April 27, 2013 at 11:56pm by bruce*

**physics**

2. At time t =0, the current to the dc motor is reversed, resulting in an angular displacement of the motor shaft given by θ = (198 rad/s)t – (24 rad/s2)t2 – (2 rad/s3)t3 a. At what time is the angular velocity of the motor shaft zero? b. Calculate the angular ...
*Saturday, April 27, 2013 at 1:06am by bruce*

**IPC 8th grade**

a motor does 5,000 joules of work in 20 seconds. What is the power of the motor.
*Thursday, March 13, 2008 at 1:38am by Debbie*

**physics**

Motor A: P = 5000 * 2 = 10000 J/s. Motor B: P = 4000 * 3 = 12000 J/s.
*Tuesday, February 26, 2013 at 8:12am by Henry*

**physics**

A lift is used to carry boxes to the top floor of a hotel 20m high.A total weight of 100kg of boxes was caried up in 20second.If the useful output of the engine driving the lift mechanism is 1.2 kilowatt.calculate the efficiency of the engine of the lift mechanism.
*Wednesday, October 12, 2011 at 4:05pm by Blessig iliya*

**Physics**

A motor is rated to deliver 10.0kW. At what speed can this motor raise a mass of 2.75x10^4kg?
*Wednesday, September 5, 2012 at 3:04am by Anonymous*

**Physics**

A helicopter winches up an injured person from a boat. The person plus equipment has a mass of 104 kg. If the height of the lift is 84 m and it is carried out at a uniform rate over 70 s, what is the power expended by the helicopter's winch motor? Assume that the engine is 61...
*Sunday, March 25, 2012 at 11:06pm by Anonymous*

**Physics**

A helicopter winches up an injured person from a boat. The person plus equipment has a mass of 104 kg. If the height of the lift is 84 m and it is carried out at a uniform rate over 70 s, what is the power expended by the helicopter's winch motor? Assume that the engine is 61...
*Sunday, March 25, 2012 at 11:06pm by Anonymous*

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