Two people carry a heavy electric motor by placing it on a light board 2.00 in long. One person lifts ai one end with a force of 400 N, and the oilier lifts the opposite end with a force of 600 N. (a) What is the weight of the motor, and where along the board is its center of gravity located? (b) Suppose the board is not light but weighs 200 N, with its center of gravity at its center, and the two people each exert the same forces as before. What is the weight of the motor in this case, and where is its center of gravity located?
Two people carry a heavy electric motor by placing it on a light board 2.00 in long. One person lifts ai one end with a force of 400 N, and the oilier lifts the opposite end with a force of 600 N. (a) What is the weight of the motor, and where along the board is its center of gravity located? (b) Suppose the board is not light but weighs 200 N, with its center of gravity at its center, and the two people each exert the same forces as before. What is the weight of the motor in this case, and where is its center of gravity located?
Two people carry a heavy electric motor by placing it on a light board 2.00 in long. One person lifts ai one end with a force of 400 N, and the oilier lifts the opposite end with a force of 600 N. (a) What is the weight of the motor, and where along the board is its center of gravity located? (b) Suppose the board is not light but weighs 200 N, with its center of gravity at its center, and the two people each exert the same forces as before. What is the weight of the motor in this case, and where is its center of gravity located?
Two people carry a heavy electric motor by placing it on a light board 2.10 mm long. One person lifts at one end with a force of 450 NN, and the other lifts the opposite end with a force of 570 NN.
What is the weight of the motor?
Express your answer in newtons.
Where along the board is its center of gravity located?
Express your answer in meters.
Suppose the board is not light but weighs 190 NN, with its center of gravity at its center, and the two people each exert the same forces as before. What is the weight of the motor in this case?
Express your answer in newtons.
Where is its center of gravity located?
Express your answer in meters.
The femur of a human leg (mass 10 kg, length 0.9 m) is in
traction, as shown in the figure. The center of gravity of the
leg is one-third of the distance from the pelvis to the
bottom of the foot. Two objects, with masses m, and m2,
m.
m.
are hung at the ends of the leg using pulleys to provide
upward support. A third object of 8 kg is hung to provide
tension along the leg. The body provides tension as well.
Write a mathematical relationship relating m1 to m2 in
terms of m, and numerical coefficients.
8 kg
m1 =
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The femur of a human leg (mass 10 kg, length 0.9 m) is in
traction, as shown in the figure. The center of gravity of the
leg is one-third of the distance from the pelvis to the
bottom of the foot. Two objects, with masses mj and m2,
m,
are hung at the ends of the leg using pulleys to provide
upward support. A third object of 8 kg is hung to provide
tension along the leg. The body provides tension as well.
body
Write a mathematical relationship relating mi to m2 in
terms of m2 and numerical coefficients.
8 kg
mj =
m- m2
Incorrect
Is the expression for m1 valid for more than one pair of
values of mj and m2?
yes
no
Incorrect
Suppose the tension force due to mj is now applied at the
leg's center of mass.
Write a new expression relating m, to m2 in terms of m2,
numerical coefficients, and given values. If you use a given
value in your equation, enter it as a number without units.
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