(II) A 14.0-kg bucket is lowered vertically by a rope in which there is 163 N of tension at a given instant. What is the acceleration of the bucket? Is it up or down? 13.Choose up to be the positive direction. Write Newton's second law for the vertical direction, and solve for the acceleration. ∑ F = F T − m g = m a a = F T − m g m = 163 N − ( 14.0 kg ) ( 9.80 m/s 2 ) 14.0 kg = 1.8 m/s 2 Since the acceleration is positive, the bucket has an upward acceleration.
(II) A 14.0-kg bucket is lowered vertically by a rope in which there is 163 N of tension at a given instant. What is the acceleration of the bucket? Is it up or down? 13.Choose up to be the positive direction. Write Newton's second law for the vertical direction, and solve for the acceleration. ∑ F = F T − m g = m a a = F T − m g m = 163 N − ( 14.0 kg ) ( 9.80 m/s 2 ) 14.0 kg = 1.8 m/s 2 Since the acceleration is positive, the bucket has an upward acceleration.
(II) A 14.0-kg bucket is lowered vertically by a rope in which there is 163 N of tension at a given instant. What is the acceleration of the bucket? Is it up or down?
13.Choose up to be the positive direction. Write Newton's second law for the vertical direction, and solve for the acceleration.
∑
F
=
F
T
−
m
g
=
m
a
a
=
F
T
−
m
g
m
=
163
N
−
(
14.0
kg
)
(
9.80
m/s
2
)
14.0
kg
=
1.8
m/s
2
Since the acceleration is positive, the bucket has an upward acceleration.
Please help me on questions A - F
(a) An elevator of mass m moving upward has two forces acting on it: the upward force of tension in the cable and the downward force due to gravity. When the elevator is accelerating upward, which is greater, T or w?
1. T 2. w 3. Both forces are equal.
(b) When the elevator is moving at a constant velocity upward, which is greater, T or w?
1. T 2. w 3.Both forces are equal.
(c) When the elevator is moving upward, but the acceleration is downward, which is greater, T or w?
1. T 2. w 3.Both forces are equal.
(d) Let the elevator have a mass of 1,225 kg and an upward acceleration of 2.3 m/s2. Find T. _____________________ NIs your answer consistent with the answer to part (a)?
Yes / No
(e) The elevator of part (d) now moves with constant upward velocity of 10 m/s. Find T. _____________________ NIs your answer consistent with your answer to part (b)?
Yes / No
(f) Having initially moved…
Please see all questions!
(a) An elevator of mass m moving upward has two forces acting on it: the upward force of tension in the cable and the downward force due to gravity. When the elevator is accelerating upward, which is greater, T or w?
1. T 2. W 3. Both forces are equal.
(b) When the elevator is moving at a constant velocity upward, which is greater, T or w?
1. T 2. W 3. Both forces are equal.
(c) When the elevator is moving upward, but the acceleration is downward, which is greater, T or w?
1. T 2. W 3. Both forces are equal.
(d) Let the elevator have a mass of 1,275 kg and an upward acceleration of 2.5 m/s2. Find T.Is your answer consistent with the answer to part (a)?
Yes / No
(e) The elevator of part (d) now moves with constant upward velocity of 10 m/s. Find T.Is your answer consistent with your answer to part (b)?
Yes / No
(f) Having initially moved upward with a constant velocity, the elevator begins to accelerate downward at 1.10 m/s2. Find T. Is your answer…
37. A worker applies a constant horizontal force with magnitude 20 N to a box with mass 40 kg resting on a level floor with negligible friction. What is the acceleration of the box?
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