between t 0 and the time the front of the box reaches the elevator. I(s) I(s) 26. 30 kg -0.20 Elevator Door 1.2 Beginning at time t 0, a student exerts a horizontal force on a box of mass 30 kg, causing it to move at 1.2 In's toward an elevator door located 16 m away, as shown above. The coefficient of kinetic friction 11k between the

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

A particle P of mass 0.4 kg moves under the action of a single constant force F newtons. The acceleration of P is (6i + 8j) m s-2 . Find (a) the angle between the acceleration and i, (b) the magnitude of F At time t seconds the velocity of P is v m s- (c) find the velocity of P when t = 5. 3.9 J (2) (3) Given that when t = 0, v = 9i — 10j, (3)

The upward force of the elevator floor on the person must be A) equal to 0 N C) equal to 750 N D) greater than 750 N 104. An 800-newton person is standing in an elevator. If the upward force of the elevator on the person is 600 Newtons, the person is ) accelerating downward B) accelerating upward D) moving downward at constant speed

The value of the net force acting on the elevator is _. RESPONSE: ANSWER

The forces are equal because it is moving at constant velocity. F T = -F g = -(-14,700N) = 14,700 N b. The elevator moves at constant speed downward Free-body diagram is to the right. The forces are equal because it is moving at constant velocity. F T = -F g = -(-14,700N) = 14,700 N c. 2The elevator accelerates upward at a constant rate of 1.2 m/s

(a) Calculate the work done on a 1500-kg elevator car by its cable to lift it 40.0 m at constant speed, assuming friction averages 100 N. (b) What is This is College Physics Answers with Shaun Dychko. The work done by the cable pulling the elevator upwards equals the force exerted by the cable...

Three seconds later, the elevator is still moving upward, but its speed has been reduced to 5.0 m/s. What is the average acceleration of the elevator A 72.2-kg person stands on a scale in an elevator. What is the apparent weight when the elevator is (a) accelerating upward with an acceleration of...

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.

Jan 04, 2012 · 32. As an object moves upward at a constant speed, its kinetic energy 1) decreases 2) increases 3) remains the same 33. The diagram below shows block A, having mass 2m and speed v, and block B having mass m and speed 2v. Compared to the kinetic energy of block A, the kinetic energy of block B is 1) the same 2) twice as great 3) one-half as great

1. The elevator E and its freight have a total mass of 400 kg. Hoisting is provided by the motor M and the 60-kg block C. If the motor has an efficiency of e = 0.6, determine the power that must be supplied to the motor when the elevator is hoisted upward at a constant speed of vE = m/s.

Constant speed is a constant slope on a position-time graph, a horizontal line on a velocity time graph or a zero value on an acceleration-time graph D 122. Average speed = total distance divided by total time = (7 cm)/(1 s) B 123. 42 2 d = ½ at (use any point) C 124.

An elevator is being lifted at a constant speed by a steel cable attached to an electric motor. Which statement is correct? B. The cable does positive work on the elevator, and the elevator does negative work on the cable. C. The cable does negative work on the elevator, and the elevator does positive work on the cable. D.

An elevator cab is moving upward at a constant speed of 4.00 m/s. The power of the motor driving the elevator cab is 150 kW. Find the mass of the elevator cab. A) 3.83×103 kg B) 3.75×104 kg C) 3.75×102 kg D) 1.75×102 kg E) 3.37×103 kg

An elevator cab is moving upward at a constant speed of 4.00 m/s. The power of the motor driving the elevator cab is 150 kW. Find the mass of the elevator cab. A) 3.83×103 kg B) 3.75×104 kg C) 3.75×102 kg D) 1.75×102 kg E) 3.37×103 kg

(c) The elevator moves upward with decreasing speed. elevator were traveling downwards at a constant speed of 2v, how long would it take for. A picture frame of mass 0.5 kg is held in place by a massless wire making an angle of 20o with respect to the horizontal.

...the elevator moves upward with constant acceleration b) When the elevator moves downward with The rope will not break when a mass of 25 kg is suspended from it but will break if the mass Answer: d Explanation: As the block slides down the inclined plane with a constant speed, the angle...

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

71) A 1500 kg elevator moves upward with constant speed through a vertical distance of 25 m. Approximately how much work was done by the tension in the cable? (A) 990 J (B) 8,100 J (C) 140,000 J (D) 375,000 J (E) 430,000 J 72) A student hangs a known weight w from a hanging spring such that it displaces the spring a distance X

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?

The ship is moving to the north at a speed of 0.33 m/s. 27. The graph in Figure 2-23 represents the motion of a bicycle. Determine the bicycle's average speed and average velocity, and describe its motion in words. A bike travels at a constant speed of 4.0 m/s. for 5.0 s. How far does it go? d ϭ vt.

Jan 23, 2013 · The CN Tower says its elevators travel up to 22 km/h, taking passengers to the top in 58 seconds. Although it doesn’t own a speed record, the CN Tower does have one world elevator record: It has ...

The elevator accelerates upward at a constant rate of 1.2 m/s 2 d. The elevator accelerates downward at a constant rate of 1.2 m/s 2 2. A crane accelerates a 175 kg load is upward.

a = 1.76 ms^-2 The resultant upwards force on the lift is linked to its acceleration through Newton's 2nd law: "Tension - weight= ma" In this case If the 480 kg elevator carries a load limit of 24 passengers (ave mass is 70kg per person) what is the max possible upward acceleration of the elevator without...

A 2.0-kg block slides on a frictionless 25° inclined plane. A force of 4.6 N acting parallel to the incline and up the incline is applied to the block. What is the acceleration of the block? 1) 1.8 m/s2 up the incline 2) 2.3 m/s2 up the incline 3) 6.6 m/s2 down the incline 4) 1.8 m/s2 down the incline 5) 2.3 m/s2 down the incline 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 ... 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 ...