The elevator moves at constant speed. Constant speed, so a = O and net scale = mg = (75.0 m/s2) = 735 N It slows at 2.00 m/s2 while moving upward. Slowing while moving upward, so a = —2.00 m/s2 net scale = ma + mg = m(a + g) = (75.0 + 9.80 m/s2) = 585 N net scale = ma + mg 75 k )( kg)(a) m/s2) 7 Physics: Principles and Problems Solutions Manual

12. A 1500-kg elevator moves upward with constant speed through a vertical distance of 25 m. How much work was done by the tension in the cable? A) 990 J B) 8100 J C) 140 000 J D) 370 000 J E) 430 000 J 13. A 12-kg crate is pushed up an incline from point A to point B as shown in the figure.

Integrated Concepts An elevator filled with passengers has a mass of 1700 kg. (a) The elevator accelerates upward from rest at a rate of $1.20 \textrm{ m/s}^2$ for 1.50 s. Calculate the tension in the cable supporting the elevator. (b) The elevator continues upward at constant velocity for 8.50 s. What is the tension in the cable during this time?

Suppose the elevator accelerates upward at 3.0 m/s2. a) If the scale reads 1,024N, what is the man’s mass? b) If the elevator has a mass of 1000 kg, and if the scale has a mass of 10 kg, find the tension in the elevator’s cable (you know, the one that is pulling the elevator upward) Answers 0) Answers in class.

(2 pts) A box is pushed and slides at a constant speed on a rough horizontal surface. The FBD is shown below. P is the push force, F the friction force, W the weight, and N the normal force. Which forces are 3rd law partner forces? 10.2 kg 26.3 kg 38.7 kg 100 kg 10 sin(8) lb 10 cos(8) lb 10 lb

The existence of escape velocity is a consequence of conservation of energy and an energy field of finite depth. For an object with a given total energy, which is moving subject to conservative forces (such as a static gravity field) it is only possible for the object to reach combinations of locations and speeds which have that total energy; and places which have a higher potential energy ...

15. A 0.50-kg object moves in a horizontal circular track with a radius of 2.5m. An external force of 3.0N, always tangent to the track, causes the object to speed up as it goes around. The work done by the external force as the mass makes one revolution is: A. 24J B. 47J C. 59J D. 94J E. 120J ans: B 16.

32. A person of mass 40 kg stands on a bathroom scale. What is the normal force (the reading on the scale)? 33. How would the reading on the scale in Problem 32 change if the person was standing in an elevator on the scale and a) the elevator was moving up with a con-stant speed? b) the elevator was accelerating upwards and moving upwards? a constant speed by a rope pulling horizontally on it. Friction is not negligible. I A skydiver has his parachute open and is floating downward through the air at a constant speed. 23. I I Two children fight over a 200 g stuffed bear. The—254boy pulls to the right with a 15 N force and the 20-kg—šxl pulls to the left with a 17 N force.

3. An elevator is moving upward with constant acceleration. The dashed curve shows the position y of the ceiling of the elevator as a function of time t. At the instant indicated by the dot, a bolt breaks loose and drops from the ceiling. Which curve best represents the position of the bolt as a function of time? t y A B C E D (1) B (2) A (3) C ...

32. A person of mass 40 kg stands on a bathroom scale. What is the normal force (the reading on the scale)? 33. How would the reading on the scale in Problem 32 change if the person was standing in an elevator on the scale and a) the elevator was moving up with a con-stant speed? b) the elevator was accelerating upwards and moving upwards?

...a) the elevator accelerates upward from rest at a rate of 1.2m/s2 for 1.5s. Calculate tension. I got the answer correct for this, by doing mg+ ma= 1700*9.8 + 1700*1.2= 18700N b) The elevator continue upwards at constant velocity for 8.50s. What is the tension in the cable during this time? This is where I'm stuck. How is time related to tension?

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You are standing on a bathroom scale in an elevator in a tall building. Your mass is 72-kg. The elevator starts from rest and travels upward with a speed that varies with time according to: When t = 4.0s , what is the reading on the bathroom scale (a.k.a. Force Normal)? 4.6 m/s/s = + = - = ® = + = N (72)(9.8) (72)(4.6) N N net F F mg ma F ma ...

A car with a mass of 1500 kg is being towed by a rope held at a 20° angle to the horizontal. A friction force of 320 N opposes the car’s motion. What is the tension in the rope if the car goes from rest to 12 m/s in 10 s?

If the elevator stops accelerating and travels at a constant speed upward, the tension returns to the value it held while the elevator was stationary. The fish has a mass bigger than 0. This is why it wants to stay where it is. But the elevator moves and they are both connected by the rope.

It moves upward for3 s with constant acceleration until it reaches its cruising speed, 1.75 m/s. (a) What is the average power of the elevator motor during this period? (b) How does this compare with its power during an upward cruise with constant speed?

Q13.9. The system shown in Fig. 13.17 is mounted in an elevator. What happens to the period of the motion (does it increase, decrease, or remain thesame) if elevator (a) accelerates upward at 5.0 m/s2; (b) moves upward at a steady 5.0 m/s; (c) accelerates downward at 5.0 m/s2? Justify your answers. Q13.1O.

An object with a mass 10 kg moves at a constant velocity of 10 m/sec. A constant force then acts for 4 second on the object and gives it a speed of 2 m/sec in opposite direction. The acceleration produced in it, is [CPMT 1971]

In 1979, space elevators were introduced to a broader audience with the simultaneous publication of Arthur C. Clarke's novel, The Fountains of Paradise, in which engineers construct a space elevator on top of a mountain peak in the fictional island country of "Taprobane" (loosely based on Sri Lanka, albeit moved south to the Equator), and Charles Sheffield's first novel, The Web Between the ...

What Does the Bathroom Scale Read in an Elevator? shows a 75.0-kg man (weight of about 165 lb.) standing on a bathroom scale in an elevator. Calculate the scale reading: (a) if the elevator accelerates upward at a rate of . and (b) if the elevator moves upward at a constant speed of 1 m/s.

Jul 14, 2015 · The fastest cable-type elevators, in the Taipei 101 tower, move at 60 km/hr. A full synchronous orbit elevator, with a counterweight well above 35,800 km altitude, might be 60,000 km long. Therefore the elevator ride would take 1000 hours (41 days 16 hours), which is clearly too long for practical use.

18. A 90-kg man stands in an elevator that is moving up at a constant speed of 5.0 m/s. The force exerted by him on the floor is about: A) zero B) 90 N C) 880 N D) 450 N E) 49 N 19. A 90-kg man stands in an elevator that has a downward acceleration of 1.4 m/s2. The force exerted by him on the ... Elevator Power. [ 7 Answers ] A 550 kg elevator starts from rest. It moves upward for 5.00 s with constant acceleration until it reaches its cruising speed, 1.75 m/s. (a) What is the average power of the elevator motor during this period? W (b) How does this power compare with the motor power when the elevator moves at its...

6. An electric motor develops 89 kW of power as it lifts a loaded elevator 15.5 m in 42 s. How much force does the motor exert? 7. A machine does 4500 J of work in 60 s. If the motor is supplied with 120 W of electric power to run, how efficient is it? 8. A comet with a mass of 7.85 x 1011 kg strikes the Earth at a speed of 25.0 km/s. a.

I want to calculate the motor rating for an electric-bicycle having a laden weight of 150 kg and maximum speed of 25 km/h. The vehicle has to be accelerate from 0 to 25 km/h in 9 to 10 seconds.

It discusses how to calculate the apparent weight of a person when the elevator is at rest, moving upward with constant speed, downward with constant velocity, accelerating upward or downward.

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Jun 24, 2011 · A 601-kg elevator starts from rest and moves upward for 4.50 s with constant acceleration until it reaches its cruising speed, 1.79 m/s. (a) What is the average power of the elevator motor during this period? W (b) How does this amount of power compare with its power during an upright trip with constant speed?

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*8 (p.174 Ex.57) An elevator cable breaks when a 755-kg elevator is 22.5m above the top of a huge spring (k = 8.00 x 10 4 N/m) at the bottom of the shaft. Calculate ( a ) the work done by gravity on the elevator before it hits the spring; ( b ) the speed of the elevator just before striking the spring; ( c ) the amount the spring compresses ... An elevator is moving upwards at a constant velocity of 5 m/s. what is the net acceleration the elevator. An elevator moving down passes its neighbor, an elevator moving up. Their speed relative to one another. You are conducting an experiment inside an elevator that can move in a...

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Jun 21, 2011 · In this case, when the elevator is standing still, the cable tension is given by: A = 9.8 m/s^2 (acceleration due to gravity being counteracted by the cable) T = 2010*9.8 = 19698 kg*m/s^2 = 19698 newtons. When accelerating upward: A = 9.8 m/s^2 + 1.2m/s^2 = 11m/s^2. T = 2010 * 11 = 22110 kg*m/s^2 = 22110 newtons ANSWER

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An elevator, fully loaded with passengers, has a mass of 4000 kg. What power must be delivered by the motor (tension in the cable) so that the elevator moves up at constant speed of 2.0 m/s? A) 78.4 kW B) 18.4 kW C) 71.3 W D) 80.0 kW E) 98.2 kW Ans: Power 4000 9.8 2 78.4 kW u u Tv mgv Q10. A student lifted his bag to a height h. The work done ... Knowing that when the elevator moves downward with an acceleration of 1.2 A constant force P is applied to a piston and rod of total mass m to make them move in a cylinder filled with oil. Determine the maximum theoretical speed that a 1350 kg automobile starting from rest can reach after traveling...kg? 5.1.2 What is the maximum speed that goods elevators can make in m/min? (4) 5.2 The loaded cage of a goods elevator has a mass of 1,45 ton. The rope passes over a drum with a mass of 0,25 ton, a radius of gyration of 400 mm and a diameter of 900 mm. The cage and balance mass of 0,65 ton move in guides.

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Example Case 2: A person of mass 72.2 kg is in an elevator. Determine what the scale they are standing on would read in each of the circumstances: a. The elevator is moving up at a constant speed. b. The elevator is moving down at a constant speed. c. The elevator is accelerating up at 3.20 m/s2. d. The elevator is accelerating downward at 3.20 ... Ans. 2TKE = ½mv = ½(2.40 kg)(43.38 m/s)2 = 2258.19 J d. How much work would be needed to lift this ball back up to the top of the building at a constant speed? Ans. 2258.19 J. Energy is conserved. The amount of kinetic energy is the same as the amount of work to reset the ball to its original height. Sep 22, 2012 · Zach, whose mass is 73 kg, is in an elevator descending at 12 m/s. The elevator takes 4.0 s to brake to a stop at the first floor. What is Zach's apparent weight before the elevator starts braking...

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Ans. 2TKE = ½mv = ½(2.40 kg)(43.38 m/s)2 = 2258.19 J d. How much work would be needed to lift this ball back up to the top of the building at a constant speed? Ans. 2258.19 J. Energy is conserved. The amount of kinetic energy is the same as the amount of work to reset the ball to its original height.

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kg? 5.1.2 What is the maximum speed that goods elevators can make in m/min? (4) 5.2 The loaded cage of a goods elevator has a mass of 1,45 ton. The rope passes over a drum with a mass of 0,25 ton, a radius of gyration of 400 mm and a diameter of 900 mm. The cage and balance mass of 0,65 ton move in guides. of length 1.2 km. The aircraft moves from . A. with initial speed 2 m s –1. It moves with constant acceleration and 20 s later it leaves the runway at . C . with speed 74 m s –1. Find (a) the acceleration of the aircraft, (2) (b) the distance . BC. (4) 2. Two small steel balls A and B have mass 0.6 kg and 0.2 kg respectively. They are moving

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18. An elevator, as illustrated, is being lifted up an elevator shaft by a steel cable. When the elevator is moving up the shaft at a constant velocity; (A) the upward force on the elevator by the cable is greater than the downward force of gravity. Oct 16, 2016 · (a) What upwards force does the courier apply to the package when carrying it horizontally at a constant velocity of 2m/s into the building? (b) The . Physics. A 500 kg elevator starts from rest. It moves upward for 4.00 s with constant acceleration until it reaches its cruising speed, 1.75 m/s. An elevator, as illustrated, is being lifted up an elevator shaft by a steel cable. When the elevator is moving up the shaft at a constant velocity; (A) the upward force on the elevator by the cable is greater than the downward force of gravity.

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Part C: The Elevator Moves Up With Constant Velocity. The elevator (and you) accelerated for 5 seconds, so it is moving upward with a velocity of 10 m/s. Since the elevator is moving with constant velocity, your acceleration is (5b) ____ m/s2.

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How Much Work Was Done By The Tension In The Elevator Cable? How much work was done by the tension in the elevator cable? Please show all work. Thank you!acceleration of 1 m/s2 to a 1 kg mass there are other units, e.g. pounds (lb) we could use, ... ★ elevator accelerating up 26 ... box moving at constant speed

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The elevator moves at constant speed. Constant speed, so a = O and net scale = mg = (75.0 m/s2) = 735 N It slows at 2.00 m/s2 while moving upward. Slowing while moving upward, so a = —2.00 m/s2 net scale = ma + mg = m(a + g) = (75.0 + 9.80 m/s2) = 585 N net scale = ma + mg 75 k )( kg)(a) m/s2) 7 Physics: Principles and Problems Solutions Manual

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A 1500-kg car moving at 25 m/s hits an initially uncompressed horizontal spring with spring constant of 2.0 × 106 N/m. What is the maximum compression of the spring? A 1500-kg car accelerates from 0 to 25 m/s in 7.0 s. What is the average power delivered by the engine?Solved: A 1500-kg Elevator Moves Upward With Constant Spee... | Chegg.com. Answer to A 1500-kg elevator moves upward with constant speed through a vertical distance of 25m. How much work was done by the te... Skip Navigation.