A motor hoist lifts a 100-kg object 15m in 4.0s. How much power was supplied by...
A motor hoist lifts a 100-kg object 15m in 4.0s. How much power was supplied by the hoist?
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A motor hoist lifts a 100-kg object 15m in 4.0s. How much power
was supplied by...
(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...
Find the useful power output of an elevator motor that lifts a 2500-kg load a height...
Find the useful power output of an elevator motor that lifts a 2500-kg load a height of 35 m in 17 s, if it also increases the speed from rest to 4.25 m/s. Note that the total mass of the counterbalanced system is 10,000 kg--so that only 2500 kg is raised in height, but the full 10000 kg is accelerated.
Example 14.8 The motor M of the hoist operates with an efficiency of E 0.85. Determine...
Example 14.8 The motor M of the hoist operates with an efficiency of E 0.85. Determine the power that must be supplied to the motor to lift the 375-N crate C at the instant point P on the cable has an acceleration of 1.2m/s2, and a velocity of 0.6 m/s Datum Datum P M
A service elevator lifts 300 kg of cargo up to 10 stories (40m). The electric motor...
A service elevator lifts 300 kg of cargo up to 10 stories (40m). The electric motor that supplies the mechanical energy for the lift uses 3000 kilojoules of electrical energy when performing this task within 20 seconds. How much potential energy does the elevator's cargo have at the end of this short ride (J)? How much work (change in mechanical energy) does this elevator system output by doing this task (J)? What is the energy % efficiency of the system?...
A 240-V electric motor is 90% efficient, meaning that 90% of the energy supplied to it...
A 240-V electric motor is 90% efficient, meaning that 90% of the energy supplied to it ends up as mechanical work. (a) If the motor lifts a 200-N weight at 3.1 m/s, how much current does it draw? (b) Let's check your answer in part (a). We expect that the less efficient the motor operates, the larger the current that must be drawn to supply the required power. Does the expression for the current drawn you have derived in part...
T(N) 1800 T = 2007 A 1 (8) 3 Given: The motor lifts the 20-kg crate...
T(N) 1800 T = 2007 A 1 (8) 3 Given: The motor lifts the 20-kg crate with a variable force, T, as defined by the figure below. Find: a) The speed of the crate when t = 2 seconds, starting from rest. Show your work. Include appropriate diagrams. m/s b) The power output of the motor at t - 2 seconds. Show your work. w c) If the efficiency of the motor is € = 0.6, which of t) a...
T(N) 1800 T = 2007 A 1 (8) 3 Given: The motor lifts the 20-kg crate...
T(N) 1800 T = 2007 A 1 (8) 3 Given: The motor lifts the 20-kg crate with a variable force, T, as defined by the figure below. Find: a) The speed of the crate when t = 2 seconds, starting from rest. Show your work. Include appropriate diagrams. m/s b) The power output of the motor at t - 2 seconds. Show your work. w c) If the efficiency of the motor is € = 0.6, which of t) a...
Airflow lifts a 3.6 kg bird 50 m up. a) How much work was done by...
Airflow lifts a 3.6 kg bird 50 m up. a) How much work was done by the flow? b) How much did its gravitational potential energy increase? A bird flies at a speed of 2.3 m/s if it has 14 J of kinetic energy. What is its mass?
First Law of Thermodynamics * - An electric motor powered by a battery lifts 5.00 kg...
First Law of Thermodynamics * - An electric motor powered by a battery lifts 5.00 kg through a vertical distance of 0.400 m. Find the decrease in internal energy of the battery. (Enter a positive value for the decrease in energy.) Submit Answer Next page
(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...
Example 14.8 The motor M of the hoist operates with an efficiency of E 0.85. Determine the power that must be supplied to the motor to lift the 375-N crate C at the instant point P on the cable has an acceleration of 1.2m/s2, and a velocity of 0.6 m/s Datum Datum P M
A 240-V electric motor is 90% efficient, meaning that 90% of the energy supplied to it ends up as mechanical work. (a) If the motor lifts a 200-N weight at 3.1 m/s, how much current does it draw? (b) Let's check your answer in part (a). We expect that the less efficient the motor operates, the larger the current that must be drawn to supply the required power. Does the expression for the current drawn you have derived in part...
T(N) 1800 T = 2007 A 1 (8) 3 Given: The motor lifts the 20-kg crate with a variable force, T, as defined by the figure below. Find: a) The speed of the crate when t = 2 seconds, starting from rest. Show your work. Include appropriate diagrams. m/s b) The power output of the motor at t - 2 seconds. Show your work. w c) If the efficiency of the motor is € = 0.6, which of t) a...
T(N) 1800 T = 2007 A 1 (8) 3 Given: The motor lifts the 20-kg crate with a variable force, T, as defined by the figure below. Find: a) The speed of the crate when t = 2 seconds, starting from rest. Show your work. Include appropriate diagrams. m/s b) The power output of the motor at t - 2 seconds. Show your work. w c) If the efficiency of the motor is € = 0.6, which of t) a...
First Law of Thermodynamics * - An electric motor powered by a battery lifts 5.00 kg through a vertical distance of 0.400 m. Find the decrease in internal energy of the battery. (Enter a positive value for the decrease in energy.) Submit Answer Next page
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