(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.  ________ N (b) How much work (in J) does she do if her center of mass rises 0.280 m? _______ J (c) What is her useful power output (in W) if she does 21 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

Q: A piano mover rolls a 200 kg piano at constant speed up a ramp 2m long at an angle of 30 degrees…

A: Given:  mass of the piano (m) = 200 kg; Ramp = 2m; Angle θ = 30o ;

Q: A single force acts on a 1.4 kg particle-like object in such a way that the position of the object…

A: Speed is given by,

Q: A spring has a natural length of 2m. It requires 384 j of work to stretch the spring to 10m.…

A: Work done: The definition of the work required for the displacement (x) of the particle from point a…

Q: A 65.0-kg file cabinet of is sliding down a rough ramp for a distance of 5.00 m as shown. The…

A: Given data:  Mass (m) = 65.0 kg Distance (d) = 5.00 m Frictional force (f) = 75.0 N g = 10.0 m/s2…

Q: A 1622 kg car has a speed of 11 m/s when it hits a tree. The tree doesn’t move and the car comes to…

A: The kinetic energy of the car before the collision is given as, The kinetic energy of the car after…

Q: (a) How long (in s) will it take an 865 kg car with a useful power output of 38.0 hp (1 hp = 746 W)…

A: Work energy theorem formula: W=change in kinetic energy     =∆K      =Kf-Ki      =12mvf2-12mvi2…

Q: An object of mass ? = 64 g slides on a frictionless table, constrained by a cord to a circular path…

A: Given data The mass is m=64 g=64×10-3 kg The radius is r=85 cm The speed is v=40 cm/s The diagram of…

Q: How much work is done on the lawn mower by the person if he exerts a constant force of 93.2 N at an…

A: The force exerted by the person is: The angle at which the force is applied below the horizontal is:…

Q: Calculate the work done by an applied force of 71.0 N on a crate for the following. (Include the…

A: applied force = 71 N a) horizontal component of the force = 71 N distance moved = 5.7 m work done =…

Q: A 57.7 kg teenager climbs stair to exercise as shown, Ay = 12.0 m. It is completed in 25.0 s. What…

A: Answer:-  Given Mass (m) = 57.7 kg  Height (∆y) = 12.0 m  Time (t) = 25 .0 s  Acceleration due to…

Q: A 2.00 kg box is placed on a 20.0 m high point on a hill and released from rest. When the box…

A:

Q: B) 3.20 m 9.00 m

A:

Q: an athlete lifts a barbell that weighs 400 N from the ground to a height of 2.20 m at a constant…

A: Given data:  Weight (mg) = 400 N Height (h) = 2.20 m Time (t) = 1.60 s Required: The output power in…

Q: physics student with a mass m of 50.0 kg is doing push-ups, as shown in the figure below. In…

A:

Q: Lifting a 5000 N piano up to window 20 M off the ground would not be fun. It would be easier if you…

A: Work done by an object when the force F is applied to a body of mass m, which inturn displaces it to…

Q: A lift to raise a crate to height of 10.0 m is used. [1hp= 746 W] Explain how much work in N m is…

A: The work done by a system is obtained by taking the scaler product of the force and…

Q: A box is pushed horizontally though a displacement of 5.0 metres by a force of 55 Newtons.…

A: Given: The applied force is 55 N. The displacement of the object is 5 m. The work done by non…

Q: A 52.8 kg teenager climbs stair to exercise as shown, Ay = 12.0 m. It is completed in 25.0 s. What…

A:

Q: If the average book has a mass of 1.60 kg with a height of 18.8 cm, and an average shelf holds 31…

A:

Q: A bowstring behaves like a spring with a spring constant of 420 N/m. It is initially pulled back 30…

A:

Q: A man pulled a 19.0 kg object 15.0 cm vertically with his teeth. (a) How much work (in J) was done…

A: A a. Given Mass of the object pulled by the man is m=-19kg Object is lifted +15 cm =15×10-2m…

Q: Calculate the work done (in J) by an 80.0 kg man who pushes a crate 4.20 m up along a ramp that…

A:

Q: The force required to compress a non-standard spring as a function of displacement is given by the…

A: Given  F(x) = -A sin(bx) + kx where  A = 25 N  b = 11 rad/m  k = 68 N/m  Work done from x = 0 to x1…

Q: A force F parallel to the x-axis is given by the graph. (16 Determine the work, W, done by the force…

A: Given:

Q: Work= force times distance: W=Fd  Part A: Calculate the work done in ligting a 460-N barbell 1.8m…

A: a)The work done is,

Q: 1. Pete lifts a 500 Newton barbell to a height of 1.2 meters. (a) How much force must Pete apply to…

A: Given: Weight of barbell W=500 N Height hoti which barbell is to be lift h=1.2 m To determine (a)…

Q: For exercise, an athlete lifts a barbell that weighs 400 N from the ground to a height of 2.20 m at…

A: