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A moving car feels the force of air on its front, and that tends to slow the car down. To keep going at the same velocity, the engine must make up the lost energy. We’ll show that much of the gasoline used by the car is to overcome the force of this air resistance. That is an important fact to know.

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The scale reading is changing, but remember: the SCALE DOES NOT MEASURE YOUR WEIGHT. The scale is only measuring the external contact force that is being applied to your body. Now consider Otis L. Evaderz who is conducting one of his famous elevator experiments. He stands on a bathroom scale and rides an elevator up and down. : A downward-moving skydiver is falling with a constant speed. air Grav : A football is moving upward and rightward towards the peak of its trajectory. Ignore air resistance. F6mv Situation : The cabin of a small freight elevator is secured to a motor by a cable and is moving upward while slowing down. Academia.edu is a platform for academics to share research papers. For a mass m= kg, the elevator must support its weight = mg = Newtons to hold it up at rest. If the acceleration is a= m/s² then a net force= Newtons is required to accelerate the mass. This requires a support force of F= Newtons. Note that the support force is equal to the weight only if the acceleration is zero, and that if the acceleration ...

V. A student whose normal weight is 500 newtons stands on a scale in an elevator and records the scale reading as a function of time. The data are shown in the graph above. At time t = 0, the elevator is at displacement x = 0 with velocity v = 0. The equilibrium glide flight is defined as flight in which the flight path angle, the angle between the local horizontal and the local velocity vector, remains constant. Equilibrium glide flight provides the maximum downrange capability. It lasts until the drag acceleration reaches 33 feet per second squared. 24) A 60.0-kg person rides in elevator while standing on a scale. The elevator is traveling downward but slowing down at a rate of 2.00 m/s2. The reading on the scale is closest to A) 589 N. B) 708 N. C) 469 N. D) 120 N. E) 349 N. 25) A 6.0 kg box slides down an inclined plane that makes an angle of 39° with the horizontal. If The definition, (used, especially before a noun, with a specifying or particularizing effect, as opposed to the indefinite or generalizing force of the indefinite articlea or an): the book you gave me; Come into the house. This book is for BS and BSc students.Its size is 2.5 Mb. You can check also many others book on my blog ( www.xpertshout.com) Dec 20, 2019 · Not moving upward with a constant velocity or speed, but accelerated upward with a constant acceleration, as when an elevator ascends or a rocket carries the space shuttle aloft. One will see exactly the same thing that one saw in the lab at rest in the Earth’s gravitational field. What will the scale be reading when the elevator is accelerating upward at 4.00 m/s2? a. 480 N. b. 676 N. c. 284 N. d. 196 N. 41. A person on a scale rides in an elevator. If the mass of the person is 60.0 kg and the. elevator accelerates downward with an acceleration of 4.90 m/s2, what is the reading on. the scale? a. 147 N. b. 294 N. c. 588 N ... Starting up Constant v down Constant v up Slowing down Slowing up At rest At rest Analysis. 1. Identify the times in the elevator ride when the scale reading is normal. Describe the motion(s) at those times. In particular, is your velocity changing during those times--are you accelerating? 2. Identify the times in the elevator ride when the ...

As the elevator accelerating in upward direction, the tension acting on the body which hangs by a spring scale from the ceiling will be greater than the weight of the body. This tension will show in the reading of the spring scale and that will be greatest. This condition is equivalent to the elevator is descending with decreasing speed. scale is an additional 815 kg. Starting from rest, the elevator accelerates upward. During the acceleration, there is a tension of 9410 N in the hoisting cable. What is the reading on the scale during the acceleration? 40. A person exerts a horizontal force of 267 N in attempt- ing to push a freezer across a room, but the freezer does not move.

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Measure the acceleration of the ball in the frame of the moving elevator as well as in the stationary frame. ... elevator is going at about a constant speed of 3.68 m/s (8.2 mph). ... shoot it up ... 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. The combined system of you + elevator has two forces, a combined force of gravity and the tension in the cable. Consider the normal force acting on you from the elevator: N = mg if the elevator is at rest or moving at constant velocity N = mg + ma if the elevator has an upward acceleration N = mg - ma if the elevator has a downward acceleration A 60 kg person standing on a scale in an elevator. What is the reading of the scale in Newton’s if the elevator is: a) moving up at constant velocity of 20 m/s, b) Accelerating up 9.8 m/s 2, d) accelerating down 9.8 m/s 2? (Acceleration due to gravity is 9.8 m/s 2) Figure 3 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 [latex]\boldsymbol{1.20\textbf{ m/s}^2}[/latex], and (b) if the elevator moves upward at a constant speed of 1 m/s. Figure 3. The elevator undergoes an unknown constant acceleration a for a given time t1. Then the elevator moves at a constant velocity for a time t2 = 4t1 . Finally the elevator brakes with a deceleration of the same magnitude as the initial acceleration for a time t3 =t1 until stopping at the sixth floor. Assume the gravitational constant is given as g ...

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