A motor with an efficiency of 85% runs a crane with an efficiency of 42%. The...
A motor with an efficiency of 85% runs a crane with an efficiency of 42%. The power supplied to the motor is 5.5 kW. At what constant speed does the crane lift a 417 kg crate?
HINT: First find the total efficiency, then the total amount of useful power.
Homework Answers
Add Answer to:
A motor with
an efficiency of 85% runs a crane with an efficiency of 42%. The...
(a) Find the useful power output (in W) of an elevator motor that lifts a 2800...
(a) Find the useful power output (in W) of an elevator motor that lifts a 2800 kg load a height of 35.0 m in 12.0 s, if it also increases the speed from rest to 4.00 m/s. Note that the total mass of the counterbalanced system is 10,000 kg-so that only 2800 kg is raised in height, but the full 10,000 kg is accelerated. (b) What does it cost (in cents), if electricity is $0.0900 per kw-h? cents Additional Materials...
Learning Goal: To use the principle of work and energy to determine characteristics of a mass...
Learning Goal:
To use the principle of work and energy to determine
characteristics of a mass being pulled up an incline and determine
the power that must be supplied to the system when the efficiency
of the input system is considered.
As shown, a 62 kg crate is pulled up a θ = 65 ∘incline by a
pulley and motor system. Initially at rest, the crate is pulled s =
2.9 m up along the incline. Undergoing constant acceleration, the...
A motor which is used to rotate a pump consumes 20 kW energy. Its efficiency is...
A motor which is used to rotate a pump consumes 20 kW energy. Its efficiency is 85%. a. What is the power delivered to the pump by the motor? b. The pump whose pipe diameter is 10 cm delivers the water at a mass flow rate 3 kg/s. What is the velocity of water? Assume density of water is 1000 kg/m3.
A crane is being used to lift a container onto a cargo ship. You need to...
A crane is being used to lift a container onto a cargo ship. You need to program the crane so that it lifts the container with a constant positive acceleration, a, during the first half of the lift and with a constant negative acceleration of the same magnitude, -a, during the second half of the lift. You want to do this so that the maximum speed of the container during the lift is 8.1 m/s. The containers are initially at...
1. A 15 hp, 4 pole, 208 V, 60 Hz, Y-connected, three-phase squirrel cage induction motor has the ...
1. A 15 hp, 4 pole, 208 V, 60 Hz, Y-connected, three-phase squirrel cage induction motor has the following parameters in Ω/phase referred to the stator: R,-0.220, Xi = 0.430, X,-15.0, R2 0.130 and X2-0.430. Mechanical and core losses amount to 300 W and 200 W respectively for rated voltage. (a) The motor is fed with a 60 Hz, 208 V voltage. It runs with a slip of 4.5 %. Find the speed, shaft torque and power, efficiency and power...
A crane is being used to lift a container onto a cargo ship. You need to...
A crane is being used to lift a container onto a cargo ship. You need to program the crane so that it lifts the container with a constant positive acceleration, a, during the first half of the lift and with a constant negative acceleration of the same magnitude, -a, during the second half of the lift. You want to do this so that the maximum speed of the container during the lift is 7.85 m/s. The containers are initially at...
A crane is being used to lift a container onto a cargo ship. You need to...
A crane is being used to lift a container onto a cargo ship. You need to program the crane so that it lifts the container with a constant positive acceleration, a, during the first half of the lift and with a constant negative acceleration of the same magnitude, -a, during the second half of the lift. You want to do this so that the maximum speed of the container during the lift is 7.90 m/s. The containers are initially at...
Assuming 95.0% efficiency for the conversion of electrical power by the motor, what current must the...
Assuming 95.0% efficiency for the conversion of electrical power by the motor, what current must the 12.0-V batteries of a 692-kg electric car be able to supply to climb a 359-m high hill in 2.00 min at a constant 11.3 m/s speed while exerting 569 N of force to overcome air resistance and friction
14. The following details are known about a 200 hp, 500 V, 435 rpm de shunt motor: full-load current is 330 A, insulation class is H, weight is 3400 kg, external diameter of the frame is 915 mm a...
14. The following details are known about a 200 hp, 500 V, 435 rpm de shunt motor: full-load current is 330 A, insulation class is H, weight is 3400 kg, external diameter of the frame is 915 mm and length of the frame is 1260 mm. If the motor is running at full-load, calculate: a. the total losses and efficiency. b, the approximate shunt field exciting current if the shunt field causes 15% of the total losses. the value of...
A) The input current to a 220 V, short-shunt compound motor at no load is 6 A. The shunt- field c...
a) The input current to a 220 V, short-shunt compound motor at no load is 6 A. The shunt- field circuit resistance is 220 Ω; the armature resistance is 0.112, and the series-field resistance is 0.1 Ω, what is the stray power loss ? (b) Assume the input rating of the motor in Part (a) to be 66 A at 220 V with a no-load speed of 1000 rpm. If the stray power loss varies as the counter-electromotive force and...
(a) Find the useful power output (in W) of an elevator motor that lifts a 2800 kg load a height of 35.0 m in 12.0 s, if it also increases the speed from rest to 4.00 m/s. Note that the total mass of the counterbalanced system is 10,000 kg-so that only 2800 kg is raised in height, but the full 10,000 kg is accelerated. (b) What does it cost (in cents), if electricity is $0.0900 per kw-h? cents Additional Materials...
Learning Goal:
To use the principle of work and energy to determine
characteristics of a mass being pulled up an incline and determine
the power that must be supplied to the system when the efficiency
of the input system is considered.
As shown, a 62 kg crate is pulled up a θ = 65 ∘incline by a
pulley and motor system. Initially at rest, the crate is pulled s =
2.9 m up along the incline. Undergoing constant acceleration, the...
1. A 15 hp, 4 pole, 208 V, 60 Hz, Y-connected, three-phase squirrel cage induction motor has the following parameters in Ω/phase referred to the stator: R,-0.220, Xi = 0.430, X,-15.0, R2 0.130 and X2-0.430. Mechanical and core losses amount to 300 W and 200 W respectively for rated voltage. (a) The motor is fed with a 60 Hz, 208 V voltage. It runs with a slip of 4.5 %. Find the speed, shaft torque and power, efficiency and power...
A crane is being used to lift a container onto a cargo ship. You need to program the crane so that it lifts the container with a constant positive acceleration, a, during the first half of the lift and with a constant negative acceleration of the same magnitude, -a, during the second half of the lift. You want to do this so that the maximum speed of the container during the lift is 7.85 m/s. The containers are initially at...
14. The following details are known about a 200 hp, 500 V, 435 rpm de shunt motor: full-load current is 330 A, insulation class is H, weight is 3400 kg, external diameter of the frame is 915 mm and length of the frame is 1260 mm. If the motor is running at full-load, calculate: a. the total losses and efficiency. b, the approximate shunt field exciting current if the shunt field causes 15% of the total losses. the value of...
a) The input current to a 220 V, short-shunt compound motor at no load is 6 A. The shunt- field circuit resistance is 220 Ω; the armature resistance is 0.112, and the series-field resistance is 0.1 Ω, what is the stray power loss ? (b) Assume the input rating of the motor in Part (a) to be 66 A at 220 V with a no-load speed of 1000 rpm. If the stray power loss varies as the counter-electromotive force and...
Most questions answered within 3 hours.
-
1- What are 5 general characteristics of Botticelli’s
paintings?
2- Describe 5 important traits of Flemish...
asked 2 minutes ago -
A golfer claims that his average golf score at the course he
plays regularly is less...
asked 17 minutes ago -
On May 1, First Bank perfected a security interest in Debtor’s
inventory. On June 1, Bob...
asked 58 minutes ago -
A new kind of typhoid shot is being developed by a medical
research team. The old...
asked 2 hours ago -
Write a chemical equation for these reactions. (Use
the lowest possible whole number coefficients.) Include
states-of-matter...
asked 4 hours ago -
For each of the Z-scores below, determine two probabilities
(show four three decimal places): (1) the...
asked 5 hours ago -
Oxidative phosphorylation is achieved through chemiosmotic
coupling, which turns chemical energy into osmotic potential energy
that...
asked 7 hours ago -
Hollywood Shoes would like to maintain their cash account at a
minimum level of $64,000, but...
asked 7 hours ago -
Proteins CtrA-P, DnaA, and GcrA behave similarly to what
molecule in the Eukaryotic Cell Cycle?
asked 7 hours ago -
TRUE OR FALSE
In case of a competitive tender procedure, in the request for
quotation, the...
asked 7 hours ago -
I am a little behind please provide some explanation, will
provide thumbs up.
This question considers...
asked 7 hours ago -
Let say the utility function as U(X,Y) = lnX + Y. Show that the
marginal rate...
asked 8 hours ago