5) A weight lifter lifts a mass of 50 kg barbell from the floor to a...
5) A weight lifter lifts a mass of 50 kg barbell from the floor to a height of 0.5 meter.
5a) Calculate the work done by the weight lifter on the barbell
5b) Calculate the work done by the gravitational force.
Homework Answers
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5) A weight lifter lifts a mass of 50 kg barbell from the floor
to a...
Brad tries out a weight-loss plan that involves repeatedly lifting a 42.9-kg barbell from the floor...
Brad tries out a weight-loss plan that involves repeatedly lifting a 42.9-kg barbell from the floor over his head to a height of 2.00 m. If he is able to complete three such lifts per minute, how long will it take for him to lose 0.50 kg of fat? “Burning” 1 g of fat supplies 37.1 kJ to the body; of this, 10.0% can be used by the muscles to lift the barbell. (Ignore the fat “burned” while he lowers...
(non calculus based physics) Question 1 An Olympic weight lifter lifts an 1800 N set of...
(non calculus based physics) Question 1 An Olympic weight lifter lifts an 1800 N set of weights from the ground to a vertical distance of 2.20 m above his head. Assuming he moves the weights at constant speed, how much work does the weight lifter do? Question 2 A 4.5 kg trunk, initially at rest, takes 2.0 s to slide 2.8 m down a rough 25° slope. Calculate: the work performed by the force of gravity. the amount of mechanical...
A weight lifter lifts a set of weights a vertical distance of 1.74 m. If a...
A weight lifter lifts a set of weights a vertical distance of 1.74 m. If a constant net force of 398 N is exerted on the weights, how much net work is done on the weights? Answer in units of J. The force required to stretch a Hooke's-law spring varies fr6m 0 N to 74.9 N as we stretch the spring by moving one end 14.5 cm from its unstressed position. Find the force constant of the spring. Answer in...
A weight lifter lifts a 310 N set of weights from ground level to a position...
A weight lifter lifts a 310 N set of weights from ground level to a position over his head, a vertical distance of 1.65 m. How much work does the weight lifter do, assuming he moves the weights at constant speed?
A weight lifter performs a squat with 400 kg (less than the world record). At a...
A weight lifter performs a squat with 400 kg (less than the world record). At a point where the knees are bent 90 degrees what is the force on the quadriceps? The weight lifter has an upper body mass of 100 kg. Assume the weight and upper body center of mass are both 0.5 m from the knee joint and the quads moment arm is 5 cm.
A weight lifter performs a squat with 400 kg (less than the world record). At a...
A weight lifter performs a squat with 400 kg (less than the world record). At a point where the knees are bent 90 degrees what is the force on the quadriceps? The weight lifter has an upper body mass of 100 kg. Assume the weight and upper body center of mass are both 0.5 m from the knee joint and the quads moment arm is 5 cm.
An athlete whose mass is 94.5 kg is performing weight-lifting exercises. Starting from the rest position,...
An athlete whose mass is 94.5 kg is performing weight-lifting exercises. Starting from the rest position, he lifts, with constant acceleration, a barbell that weighs 530 N . He lifts the barbell a distance of 0.70 m in a time of 1.1 s . Use Newton's laws to find the total force that his feet exert on the ground as he lifts the barbell. Express your answer using two significant figures.
A woman lifts a 3.6-kg barbell in each hand with her arm in a horizontal position...
A woman lifts a 3.6-kg barbell in each hand with her arm in a
horizontal position at the side of her body and holds it there for
3 s (see the figure below).
What force does the deltoid muscle in her shoulder exert on the
humerus bone while holding the barbell? The deltoid attaches 13 cm
from the shoulder joint and makes a 13? angle with the humerus. The
barbell in her hand is 0.55 m from the shoulder joint,...
A weight lifter pushes dumbbells of total mass 20 kg upward with a force of just...
A weight lifter pushes dumbbells of total mass 20 kg upward with a force of just a little more than the weight of the dumbbells a distance of 1.2 meters. He then lets the dumbbells drop back down without doing any work on them. If he wants to use (actually:convert) 50 kCal of energy in this workout, how many repetitions does he have to do? (There are 4.2 Joules in a calorie and 1000 calories in a kCal)
In exercising, a weight lifter loses 0.174 kg of water through evaporation, the heat required to...
In exercising, a weight lifter loses 0.174 kg of water through evaporation, the heat required to evaporate the water coming from the weight lifter's body. The work done in lifting weights is 1.40E+5 J. Assuming that the latent heat of vaporization of perspiration is 2.40E+6 J/kg, find the change in the internal energy of the weight lifter.
A weight lifter lifts a set of weights a vertical distance of 1.74 m. If a constant net force of 398 N is exerted on the weights, how much net work is done on the weights? Answer in units of J. The force required to stretch a Hooke's-law spring varies fr6m 0 N to 74.9 N as we stretch the spring by moving one end 14.5 cm from its unstressed position. Find the force constant of the spring. Answer in...
A weight lifter performs a squat with 400 kg (less than the world record). At a point where the knees are bent 90 degrees what is the force on the quadriceps? The weight lifter has an upper body mass of 100 kg. Assume the weight and upper body center of mass are both 0.5 m from the knee joint and the quads moment arm is 5 cm.
A weight lifter performs a squat with 400 kg (less than the world record). At a point where the knees are bent 90 degrees what is the force on the quadriceps? The weight lifter has an upper body mass of 100 kg. Assume the weight and upper body center of mass are both 0.5 m from the knee joint and the quads moment arm is 5 cm.
A woman lifts a 3.6-kg barbell in each hand with her arm in a
horizontal position at the side of her body and holds it there for
3 s (see the figure below).
What force does the deltoid muscle in her shoulder exert on the
humerus bone while holding the barbell? The deltoid attaches 13 cm
from the shoulder joint and makes a 13? angle with the humerus. The
barbell in her hand is 0.55 m from the shoulder joint,...
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