an athlete lifts a 290N set of weights from ground level to a position over her head, a vertical distance of 1.70m. How much work does the athletes do? Assume the weights are moved at a constant speed.
an athlete lifts a 290N set of weights from ground level to a position over her...
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 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...
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.
Olympic weightlifter Zoe Smith lifts a 58 kg barbell over her head, 2.1 meters above the ground in 0.6 sec. How much power must she generate to lift the barbell from the ground? a) 0 W b) 58 W c) 120 W d) 720 W e) 1990 W
A 55 kg athlete leaps into the air from a crouching position. Her center of mass rises 60 cm as her feet leave the ground and then it continues another 80 cm to the top of the leap. What is the average power she develops, assuming the force on the ground is constant? The answer key says that the answer is 1.42 kW but I cannot figure out how to solve it.
(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...
2. A woman lifts a single shopping bag weighing 100 N from the ground to a height of (a) 15 cm. She then walks 2.0 km on level ground carrying the bag at a constant height. Determine how much work has she done on the bag, in units of Calories where 1 Calorie 4.2 kJ. 13 marks] With reference to an equation for Conservation of Momentum, explain with the aid of a sketch why a heavier car is widely perceived...
A large cannon is fired from ground level over level ground at an angle of 55 above the horizontal. This initial speed is 384 m/s. Neglecting air resistance, how far will the projectile travel in the horizontal direction before striking the ground?
A golf ball is hit from ground level and flies through the air over level ground. If it is moving at an initial angle of 52 degrees from the horizontal and the x component of the initial velocity is vz.i 30 m/s, r,l how far does it travel before hitting the ground?
A projectile is fired from the ground level with an initial velocity that has a vertical component of 20 m/s and a horizontal component of 30 m/s. Find the range R. In the figure below, a constant external force P=160 N is applied to a 20.0 kg box, which is on a rough horizontal surface. While the force pushes the box a distance of 8.00 m, the speed changes from 0.500 m/s to 2.60 m/s. Find the work done by...