What power is expended by a weight lifter when lifting a 66 kg barbell a vertical...
A weight lifter is bench-pressing a barbell whose weight is 710 N. He raises the barbell a vertical distance of 0.65 m, and then lowers it back to its original position next to his chest. Assume the weight is raised and lowered at a constant velocity, and that “up” is the positive direction. Determine the work done on the barbell (a) While the barbell is being raised (b) While the barbell is being lowered
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.
Part A The power expended for a barbell raised 2.0 m in 2 s is O 8W O 1 W O4W O not enough information Submit Request Answer Provide Feedback
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.
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...
Select the equation that will correctly show that nearly 900 W of power is expended when a 600-N barbell is lifted 2.1 m above the floor in 1.4 s. P= w/t = fd/t P=W/t = 2fd/3t P=W/t = fd/t^2 P=W/t = 2fd/t
Which required more work: lifting uniformly a 50.0 kg crate a vertical distance of 2.0 meters or lifting a 25.0 kg crate a vertical distance of 4.5 meters with a 1.0 m/s^2 acceleration?
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 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...