(a) Calculate the force (in N) the woman in the figure below exerts to do a push-up at constant speed, taking all data to be known to three digits. (You may need to use torque methods from a later chapter.)m = 62 kgCGwFreaction0.87 m1.45 mN(b) How much work (in J) does she do if her center of mass rises 0.180 m?(c) What is her useful power output (in Ww) if she does 27 push-ups in 1 min? (Should work done lowering her body be included? See the discussion of useful work in Work, Energy, and Power in Humans.)

Given data: The mass is m=62 kg The rise distance of the center of mass is d=0.180 m The number of…

(a) Calculate the force (in N) the woman in the figure below exerts to do a push-up at constant speed, taking all data to be known to three digits. (You may need to use torque methods from a later chapter. m = 62 kg CG w Freaction 0.87 m 1.45 m (b) How much work (in J) does she do if her center of mass rises 0.180 m? (c) What is her useful power output (in W) if she does 27 push-ups in 1 min? (Should work done lowering her body be included? See the discussion of useful work in Work, Energy, and Power in Humans.) w

(a) Calculate the force (in N) the woman in the figure below exerts to do a push-up at constant speed, taking all data to be known to three digits. (You may need to use torque methods from a later chapter. m = 62 kg CG w Freaction 0.87 m 1.45 m (b) How much work (in J) does she do if her center of mass rises 0.180 m? (c) What is her useful power output (in W) if she does 27 push-ups in 1 min? (Should work done lowering her body be included? See the discussion of useful work in Work, Energy, and Power in Humans.) w

University Physics Volume 1

18th Edition

ISBN:9781938168277

Author:William Moebs, Samuel J. Ling, Jeff Sanny

Publisher:William Moebs, Samuel J. Ling, Jeff Sanny

Chapter7: Work And Kinetic Energy

Section: Chapter Questions

Problem 43P: A particle moves along a curved path y(x)=(10m){1+cos[0.1m1]x} , from x=0 to x=10m , subject to a...

See similar textbooks

Similar questions

A particle moves along a curved path y(x)=(10m){1+cos[0.1m1]x} , from x=0 to x=10m , subject to a tangential force of variable magnitude F(x)=(10N)sin[(0.1m-1)x] . How much work does the force do? (Hint: Consult a table of integrals or use a numerical integration program.)
Show that when A+B=C then A2+B2+2ABcos , where is the angle between vectors A and B .
If the dot product of two vectors vanishes, what can you say about their directions?
The mass of a hoop of radius 1.0 m is 6.0 kg. It rolls across a horizontal surface with a speed of 10.0 m/s. (a) How much work is required to stop the hoop? (b) If the hoop starts up a surface at 30 to the horizontal with a speed of 10.0 m/s, how far along the incline will it travel before stopping and rolling back down?
A 3.00-kg object has a velocity (6.00i1.00j)m/s. (a) What is its kinetic energy at this moment? (b) What is the net work done on the object if its velocity changes to (8.00i+4.00j)m/s. (Note: From the definition of the dot product, v2=vv.)
(a) Calculate the force (in N) the woman in the figure below exerts to do a push-up at constant speed, taking all data to be known to three digits. (You may need to use torque methods from a later chapter.) m = 68 kg CG Fre reaction 0.85 m 1.41 m N (b) How much work (in J) does she do if her center of mass rises 0.220 m? (c) What is her useful power output (in W) if she does 15 push-ups in 1 min? (Should work done lowering her body be included? See the discussion of useful work in Work, Energy, and Power in Humans.) W
(a) Calculate the force (in N) the woman in the figure below exerts to do a push-up at constant speed, taking all data to be known to three digits. (You may need to use torque methods from a later chapter.) N 0.88 m m = 56 kg CG W 1.46 m W Freaction (b) How much work (in J) does she do if her center of mass rises 0.180 m? (c) What is her useful power output (in W) if she does 24 push-ups in 1 min? (Should work done lowering her body be included? See the discussion of useful work in Work, Energy, and Power in Humans.)
(a) Calculate the force (in N) the woman in the figure below exerts to do a push-up at constant speed, taking all data to be known to three digits. (You may need to use torque methods from a later chapter.) m = 47 kg CG Fe reaction 0.85 m 1.42 m N (b) How much work (in J) does she do if her center of mass rises 0.220 m? (c) What is her useful power output (in W) if she does 24 push-ups in 1 min? (Should work done lowering her body be included? See the discussion of useful work in Work, Energy, and Power in Humans.)
A 170-lb man carries a 20-lb can of paint up a helical staircase that encircles a silo with radius 30 ft. If the silo is 120 ft high and the man makes exactly four complete revolutions, how much work is done by the man against gravity in climbing to the top? Answer in ft-lbs.
The puck in the figure below has a mass of 0.120 kg. The distance of the puck from the center of rotation is originally 43.5 cm, and the puck is sliding with a speed of 80.0 cm/s. The string is pulled downward 14.0 cm through the hole in the frictionless table. Determine the work done on the puck. (Suggestion: Consider the change of kinetic energy.) 0 R STUDIOC ve're on a mission to change the world a time. We embrace color with both arms sion into every detail to make each day opier - and a whole lot more stylish. NED WITH IN CHARLOTTE, NC
A gardener pushes a 12 kg lawnmower whose handle is tilted up 37∘ above horizontal. The lawnmower's coefficient of rolling friction is 0.20. How much power does the gardener have to supply to push the lawnmower at a constant speed of 1.0 m/s ? Assume his push is parallel to the handle. Needs Complete typed solution with 100 % accuracy.
Q12. The two tugboats each exert a constant force F = 20 N on the ship as shown in FigureQ12 These forces are always directed perpendicular to the ship's centerline. If the ship has amass m and a radius of gyration about its center of mass G of kG, determine the work done ofthe ship after it turns 80°. The ship is originally at rest. Where d = 6 m.