(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 kgCG0.85 m1.42 mWFreaction(b) How much work (in J) does she do if her center of mass rises 0.260 m?(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

Given data: Mass of the person (m) = 68 kg.Distance 1 (d1) = 0.85 m.Distance 2 (d2) = 1.42 m. To…

(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 0.85 m 1.42 m F₁ Freaction (b) How much work (in J) does she do if her center of mass rises 0.260 m? (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

(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 0.85 m 1.42 m F₁ Freaction (b) How much work (in J) does she do if her center of mass rises 0.260 m? (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

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

See similar textbooks

Related questions

Q: Mass of your nephew: 24.9 kg Initial Velocity: 2.6 m/s Displacement: 3.5 m Kinetic coefficient of…

A: Solution

Q: A 140-lb man carries a 5-lb can of paint up a helical staircase that encircles a silo with radius 20…

A: Total weight is , w=140+5=145 lb Radius ,R=20 ft Height or displacement, d=80 ft We have to find…

Q: The compound bow in the previous problem requires 152 J of work to draw the string back tox = 0.540…

Q: A box of mass m moves a distance d across a horizontal floor, its speed increases due to a…

A: Total work done is only due to forces that are parallel to displacement and as displacement or…

Q: Two identical, thin boards are hinged together at an end as shown below. The length of each board is…

A: Torque is the rotational equivalent of linear force that causes an object to rotate about an axis.…

Q: Suppose you use an ideal pulley of the type shown in the figure below and find it necessary to exert…

Q: Can you please solve this problem and show all of the steps

A: Hey, since there are multiple subparts question posted, we will answer first three questions. If you…

Q: A gardener pushes a 12 kg lawnmower whose handle is tilted up 37∘ above horizontal. The lawnmower's…

A: Mass of object is Angle is Coefficient of rolling friction is Speed is Note:Find:Power.

Q: A solid cone with height 9 m and base with radius 2.7 m is built using a lightweight material whose…

Q: M = -3î + 6j – 5k and N = -21 + 3j + k The cross product of MxN equals Choose the best answer. A -9i…

A: Given: M→=-3i^+6j^-5k^N→=-2i^+3j^+k^

Q: The block has a mass of 143 kg and rests on a surface for which the coefficients of static and…

Q: A 1.80 kg ball is held at rest up one side of a half-pipe. It is 1.90 m off the ground when it is…

Q: A person opens a door by applying a 13-N force perpendicular to it at a distance 0.90 m from the…

Q: Two blocks, A and B (with mass 45 kg and 125 kg, respectively), are connected by a string, as shown…

A: Required : Change in Kinetic energy of the block A

Q: need help with number 20

A: Given For student-A Force applied by student B = 30 N Height upto which box is lifted = 0.40 m Time…

Q: Find the scalar and cross product of two vectors using component method.

A: The scalar product is given by A→ . B→ = A B cosθA→ . B→ = 6×4×cos30° = 20.785

Q: A force of 3N is applied to an object at an angle of -1 radians to the x-axis. The object slides in…

A: The work done by a force on moving a body by a distance is given by W = F.s = F×s×cosθ, where F =…

Q: A spring and block are in the arrangement of the figure. When the block is pulled out to x = +5.0…

A: Force applied when block moved to x = 5 cm is Fapp = 360 N Distance the block moved x = 5 cm = 5 x…

Q: A block of mass 1.5 kg is at rest on a frictionless floor. A constant force F is subjected to the…

Q: Using the definition of the scalar product, find the angle between the following vectors.

Q: Suppose a 100 foot cable that weighs 500 lbs is suspended from the top of a 300 foot tall building,…

Q: In this problem, the friction is equal to zero. Vector A along the positive X axis = 14.0…

A: The given vectors are:

Q: A point mass of 1.2 kg at the end of a cord is rotated on a frictionless horizontal surface in a…

A: Given that: r= 0.2 m w= 3.8 rad/s m= 1.2 kg We know that I= mr2 where I is the moment of inertia…

Q: solve number 5 with full works and steps

A: Q5) Answer:- Given:- mass of the block (m)=1.95 kg Above the ground (h) = 2.2 m so, hf =2.20 m hi…

Q: You have Two boxes of mass 5.00 kg and 3.00 kg that are attached via a pulley, as seen in the…

Q: What is the Net Work ? Wnet = Fnetd cos θ Cart Mass, mc . 284 kg Angle, theta 49 degrees…

A: Work done is defined as the energy required to move an object from one place to another by applying…

Q: What is the Net Work ? Wnet = Fnetd cos θ Cart Mass, mc . 284 kg Angle, theta 49 degrees Distance,…

Q: , how much work is done by the man against gravity in climbing to the top?

A: If the acted force is F and for the force displacement is dr then We know work ,…

Q: 9.0 kg 1.0 m 1.2 kg 2.0 m 2.5 kg

Q: Calculate the work W against gravity required to build a right circular cone of height 3 m and base…

A: Disclaimer: “Since you have asked multiple question, we will solve the first question for you. If…

Q: ladder is raised to a vertical position Compute the work done by the force lifting the ladder. The…

A: Weight of ladder, Length of ladder, The ladder is raised to…

Q: In an amusement park, a car with a mass of 481 kg rolls in a track as shown below. Note that the…

A: Hi = 50 m HA = 20 m HB = 40 m Hc = 0 m m = 481 kg Speed at A = 21 m/s

Q: In the figure the pulley has negligible mass, and both it and the inclined plane are frictionless.…

Q: A ladder, 10 meters long, is lying on the ground with a total mass of 80 kg. How much work is…

Q: 8. A person spins a grindstone with a radius of 0.16 m along its edge, making the grindstone spin…

A: (8) The given data are: r=0.16 mW=402 J Here, r denotes the radius and W denotes the workdone.

Concept explainers

Torque

Torque is the rotational equivalent of linear force in physics and mechanics. Based on the course of study, it is also known as the moment of force, rotational force, or turning effect.

Question

(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
0.85 m
1.42 m
W
F
reaction
(b) How much work (in J) does she do if her center of mass rises 0.260 m?
(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

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

This is a popular solution!

SEE SOLUTION Check out a sample Q&A here

Step 1

Step 2

Step 3

Step 4

Step 5

Trending now

This is a popular solution!

Step by step

Solved in 5 steps

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.

Similar questions

i need help with the first one
When generating maximum power from his club, Captain Caveman holds his club at a very specific angle. The bottom of his club (closest to his hands) has coordinates of (1.25, 2.5) and the top of his club has coordinates of (2.3, 3.7), measured in feet. What is the absolute angle of his club relative to the right horizontal?
Computation. The figure shows two blocks, released from rest, connected by a light string passing without slipping over a pulley with moment of inertia 0.032 kg-m² and radius 0.1 m. The coefficient of kinetic friction between the block and the table is 0.38. Using energy methods, find the blocks' speed after they have moved 0.22 m if M = 5.2 kg and m = 7.3 kg. V= M 11 m/s m Record your numerical answer below, assuming three significant figures. Remember to include a as necessary. 31 6:37 P
A gardener pushes a 11 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 1.4 m/s? Assume his push is parallel to the handle.
rrrA solid spherical jewel rolls smoothly from rest down a ramp. The jewel descends a vertical height of 1.2m to reach the bottom of the ramp. The previous question asked "What is the jewel's speed at the bottom of the ramp?" Hint: This problem has nothing to do with elasticity as we did not formally cover that topic. All elastic energy terms are zero. List all terms that had a value of zero
Question Four forces (measured in Newtons) act on a crate. The forces are given by the vectors: F₁ = 2121-136ĵ+ 241k N, F₂ = 108î+ 144) + 189k N. F3 = -400 + 180) + 240k N, and F₂ = -270k N Given: The magnitude of the resultant force = 449.2 N. The work done by the force F is 770.3J. The moment of the force F₂ = (-108î - 180k) N/m a) What is the angle (in degrees to 2 decimal places) between the force vectors F₂ and F3? b) What is the force vector, F, that acts in the opposite direction to the force F₂ and has magnitude of 203 Newtons?
Needs Complete typed solution with 100 % accuracy.
#6
Needs Complete typed solution with 100 % accuracy.
1) In the formula given for the calculation of work, the variable F represents: A) The angular coordinate of the vector d when it is written in polar coordinates B) The scalar magnitude of the force doing work C) The angular coordinate of the vector F when it is written in polar coordinates D) The scalar magnitude of the displacement through which the system moves while the force isapplied E) The direction of the force acting on the system F) The angular difference between the vectors F and d G) The diameter of the system H) The weight, or force due to gravity, on the system I) The work done by the force F 2) In the formula given for the calculation of work, the variable d represents: A) The angular coordinate of the vector d when it is written in polar coordinates B) The scalar magnitude of the force doing work C) The angular coordinate of the vector F when it is written in polar coordinates D) The scalar magnitude of the displacement through which the system moves while the force…
Energy conservation with conservative forces: A very small 100-g object is attached to one end of a massless 10-cm rod that is pivoted without friction about the opposite end. The rod is held vertical, with the object at the top, and released, allowing the rod to swing. What is the speed of the object at the instant that the rod is horizontal? 1.8 m/s 1.4 m/s 0.71 m/s 2.8 m/s 4.0 m/s fbb
A tired squirrel (mass 1 kg) does push-ups by applying a force to elevate its center-of-mass by 5 cm. Determine the number of push-ups which a tired squirrel must do in order to do a mere 1.0 Joule of work.