A boy holds a 40-N weight at arm’s length for 10 s. His arm is 1.5...
A boy holds a 40-N weight at arm’s length for 10 s. His arm is 1.5 m above the ground. What is the work done by the force of the boy on the weight while he is holding it?
Homework Answers
We know Work(W) = F . d ( F=force applied & d = displacement of the object)
Since the boy is just holding the object I.e. displacement d=0 work done will be 0.
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A boy holds a 40-N weight at arm’s length for 10 s. His arm is
1.5...
11. A boy holds a 40-N weight at arm's length for 10 s. His arm is...
11. A boy holds a 40-N weight at arm's length for 10 s. His arm is 1.5 m above the ground. The work done by the force of the boy on the weight while he is holding it is a. 0 b. 6J c. 40 J d. 60 J e. 90 J
An athlete at the gym holds a 2.5 kg steel ball in his hand. His arm is 60 cm long and has a mass of 3.6 kg. Assume the center of mass of the arm is at the geometrical center of the arm.
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refer to picture. A boy pulls his younger sister on a toboggan by a rope that...
refer to picture.
A boy pulls his younger sister on a toboggan by a rope that makes an angle of 37.0° with the horizontal, as shown. The boy maintains a tension of 25.0 N in the rope and walks, on level ground, at a constant speed of 1.10 m/s. The combined mass of the girl and the toboggan is 30.0 kg. Determine a. the normal force exerted on the toboggan by the ground. the coefficient of kinetic friction between the...
A cook holds a 1.38 kg carton of milk at arm’s length. 4 26 cm 8...
A cook holds a 1.38 kg carton of milk at arm’s length. 4 26 cm 8 cm FB 65.6◦ W What force FB must be exerted by the bi- ceps muscle? The acceleration of gravity is 9.8 m/s2 . (Ignore the weight of the forearm.) Answer in units of N.
QUESTION 2 Find the force generated by the deltoid if: His arm length (d) is: 0.96...
QUESTION 2 Find the force generated by the deltoid if: His arm length (d) is: 0.96 m The COG of the arm is 29% away from the proximal end His arm weighs 7.8 N The weight weighs 125 N The angle of the arm from vertical (@): 90 degrees The deltoid insertion is 0.18 m from proximal end The line of pull for the deltoid is: 20 degrees Round to the nearest whole #. Leave no space between answer and...
Cole is attempting to lift 150 N. The moment arm of this weight about his elbow...
Cole is attempting to lift 150 N. The moment arm of this weight about his elbow joint is 25 cm. The force generated by the elbow flexor muscles is 2000 N. The moment arm of the elbow flexor muscles is 2 cm. Is Cole able to lift the weight with this amount of force in his flexor muscles?
2. A person is holding a weight (100 N) in their hand. The weight is a...
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a boy pulls a wagon with an 80 n directed 25 degrees above the horizontal a...
a boy pulls a wagon with an 80 n directed 25 degrees above the horizontal a distance of 30 m. a) how much work does the boy do. b) how much work does he do if the force is directed parallel to the ground.
A man holds a 182-N ball in his hand, with the forearm horizontal (see the figure)....
A man holds a 182-N ball in his hand, with the forearm horizontal (see the figure). He can support the ball in this position because of the flexor muscle force M, which is applied perpendicular to the forearm. The forearm weighs 19.3 N and has a center of gravity as indicated. Find (a) the magnitude of and the (b) magnitude and (c) direction (as a positive angle counterclockwise from horizontal) of the force applied by the upper arm bone to...
A man holds a 194-N ball in his hand, with the forearm horizontal (see the figure)....
A man holds a 194-N ball in his hand, with the forearm horizontal (see the figure). He can support the ball in this position because of the flexor muscle force M, which is applied perpendicular to the forearm. The forearm weighs 18.5 N and has a center of gravity as indicated. Find (a) the magnitude of M and the (b) magnitude and (c) direction (as a positive angle counterclockwise from horizontal) of the force applied by the upper arm bone...
11. A boy holds a 40-N weight at arm's length for 10 s. His arm is 1.5 m above the ground. The work done by the force of the boy on the weight while he is holding it is a. 0 b. 6J c. 40 J d. 60 J e. 90 J
refer to picture.
A boy pulls his younger sister on a toboggan by a rope that makes an angle of 37.0° with the horizontal, as shown. The boy maintains a tension of 25.0 N in the rope and walks, on level ground, at a constant speed of 1.10 m/s. The combined mass of the girl and the toboggan is 30.0 kg. Determine a. the normal force exerted on the toboggan by the ground. the coefficient of kinetic friction between the...
QUESTION 2 Find the force generated by the deltoid if: His arm length (d) is: 0.96 m The COG of the arm is 29% away from the proximal end His arm weighs 7.8 N The weight weighs 125 N The angle of the arm from vertical (@): 90 degrees The deltoid insertion is 0.18 m from proximal end The line of pull for the deltoid is: 20 degrees Round to the nearest whole #. Leave no space between answer and...
A man holds a 182-N ball in his hand, with the forearm horizontal (see the figure). He can support the ball in this position because of the flexor muscle force M, which is applied perpendicular to the forearm. The forearm weighs 19.3 N and has a center of gravity as indicated. Find (a) the magnitude of and the (b) magnitude and (c) direction (as a positive angle counterclockwise from horizontal) of the force applied by the upper arm bone to...
A man holds a 194-N ball in his hand, with the forearm horizontal (see the figure). He can support the ball in this position because of the flexor muscle force M, which is applied perpendicular to the forearm. The forearm weighs 18.5 N and has a center of gravity as indicated. Find (a) the magnitude of M and the (b) magnitude and (c) direction (as a positive angle counterclockwise from horizontal) of the force applied by the upper arm bone...
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