When you lift an object by moving only your forearm, the main lifting muscle in your arm is the biceps. Suppose the mass of a forearm with hand is 1.80 kg. If the biceps is connected to the forearm a distance of 2.50 cm from the elbow, what is the magnitude of the torque exerted by the biceps to hold a 44.5 N (about 10 lbs) ball at the end of the forearm at distance of 35.0 cm from the elbow, with the forearm parallel to the floor, in N-m? Use g = 10.0 m/s². Your answer needs to have 3 significant figures, including the negative sign in your answer if needed. Do not include the positive sign if the answer is positive. No unit is needed in your answer, it is already given in the question statement. driceps -Biceps -drall

When you lift an object by moving only your forearm, the main lifting muscle in your arm is the biceps. Suppose the mass of a forearm with hand is 1.80 kg. If the biceps is connected to the forearm a distance of 2.50 cm from the elbow, what is the magnitude of the torque exerted by the biceps to hold a 44.5 N (about 10 lbs) ball at the end of the forearm at distance of 35.0 cm from the elbow, with the forearm parallel to the floor, in N-m? Use g = 10.0 m/s². Your answer needs to have 3 significant figures, including the negative sign in your answer if needed. Do not include the positive sign if the answer is positive. No unit is needed in your answer, it is already given in the question statement. driceps -Biceps -drall

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: A heavy concrete panel is being lifted into position in a building by means of a crane (see figure…

Q: Calculate the torque given r= (6î + 5j)m, and F = (2î – 3j)N

Q: hen you lift an object by moving only your forearm, the main lifting muscle in your arm is the…

Q: This girl is babysitting two 30-Kg kids at a neighborhood park. She places one on each end of a…

A: The formula to calculate torque is given by; τ=F× rτ=F r sinθWhere;F= forcer=distance between axis…

Q: An automobile traveling 100 km/h has tires of 72.0 cm diameter. (a) What is the angular speed of the…

Q: The torque acting is 3000 Nm with an angular acceleration of 2 rad/s?. The moment of inertia of body…

Q: In unit-vector notation, what is the torque about the origin on a particle located at coordinates…

Q: When you lift an object by moving only your forearm, the main lifting muscle in your arm is the…

Q: The tune-up specifications of a car call for the spark plugs to be tightened to a torque of 40 N⋅m.…

Q: In unit-vector notation, what is the torque about the origin on a particle located at coordinates…

Q: A car tune-up manual calls for tightening the spark plugs to a torque of 35.0 N m. To achieve this…

A: Torque is equal to vector product of force and the distance from the point where the torque acts to…

Q: A large grinding wheel in the shape of a solid cylinder of radius 0.330 m is free to rotate on a…

Q: An automobile traveling 110 km/h has tires of 74.0 cm diameter. (a) What is the angular speed of the…

Q: During a knee extension exercise there are two forces that are producing torque at the knee joint.…

Q: A couterclockwise torque of +1.10 N•m is applied to a bicycle wheel of radius 26 cm and mass 0.72…

A: Torque = 1.1 Nm Radius of ring = 26 cm = 0.26 m mass = 0.72 Kg Moment of inertia of a ring = M R 2…

Q: A centrifuge rotor rotating at 1.03×104 rpm is shut off and is eventually brought uniformly to rest…

Q: A merry-go-round accelerates from rest to 0.63 rad/s in 39 s Assuming the merry-go-round is a…

A: Given, Initial angular speed, Final angular speed, Time, Mass of merry-go-round, Radius of…

Q: A merry-go-round accelerates from rest to 0.63 rad/srad/s in 39 ss. Assuming the merry-go-round is a…

A: Given: Initial angular velocity = 0 rad/s. Final angular velocity (v) = 0.63 rad/s. Time taken to…

Q: You have two identical-looking metal spheres of the same size and the same mass. One is solid; the…

Q: To develop muscle tone, a woman lifts a 2.50 kg weight held in her hand. She uses her biceps muscle…

A: Given Data :- The mass of weight lifted by the women is M = 2.50 kg. The angle of flex is θ = 60o.…

Q: You are holding a 20 kg dumbbell straight out at arm's length. Assuming your arm is 0.80 m long,…

A: Given data The mass of the dumbbell is m=20 kg The length of the arm is L=0.80 m The torque…

Q: Assume it to be approximately an annular ring with an inner radius ofR, = 0.280 m and an outer…

Q: A car tune-up manual calls for tightening the spark plugs to a torque of 31.0 N⋅m. To achieve this…

Q: The torque acting is 2000 Nm with an angular acceleration of 2 rad/s?. The moment of inertia of body…

Q: Calculate the torque for a force of (3i + 4j) N that acts on a moment arm of (5i + 2j) m

A: Torque due to force τ=rxF

Q: A torque of 35.3 Nm is applied to an initially motionless wheel which rotates around a fixed axis.…

Q: When opening a door, you push on it perpendicularly with a force of 55 N at a distance of 0.75 m…

Q: 200 g uniform rod of length 5.0 m is pivoted about one end. What would be the angular acceleration…

Q: A discus thrower moves the discus in 2.40 complete revolutions about his body in 1.43 s (starting…

Q: When you lift an object by moving only your forearm, the main lifting muscle in your arm is the…

Q: )ka acts on a pebble with position vector 7 = (1.92 m) - (5.98 m , relative to the origin. Force F =…

Q: A flywheel, in the form of uniform disk, is 5.0 m in diameter and weighs 640 N. What will be its…

Q: A constant torque is applied to a rigid body whose moment of inertia is 4.40 kg-m2 around the axis…

Q: Three forces are acting on a bar of length 3.5 m. ?1has a magnitude of 11 N and acts on the end of…

A: Total length of bar=3.5 m F1=11 N l1=3.5 m θ=21∘ F2=21 N l2=1.75 m F3=? l3=0.15 m

Q: A carpenter is driving a nail straight into the northern wall of the house, with an average force of…

A: using the equation, τ=rF

Q: A force F=(-5j+3k)N is applied to an object that is a distance r=(2j+6k)m from a pivot point. (a)…

A: Torque is defined as the cross product between distance and force. Mathematically, τ⇀=r⇀×F⇀ a)…

Q: You stepped on the edge of a bicycle wheel (radius 0.622 m) to make it slow down. If you pressed…

A: Radius of wheel, r = 0.622 m Force applied, F = 10 N Co efficient of friction = 0.462

Q: An automobile engine can produce 200 N · m of torque. Calculate the angular acceleration produced if…

A: There are two wheels in the rear. So, the moment if inertia of the wheels (disk) is Moment of…

Q: A gymnast on the uneven parallel bars is at rest, tipped at a 45° angle from the vertical. The…

A: Given data: Angle from the vertical. θ=450 Distance from hands to feet, R=1.8 m Centre of gravity is…

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

When you lift an object by moving only your forearm, the main lifting muscle in your arm is the biceps. Suppose the mass of a forearm with hand is 1.80 kg. If the biceps is
connected to the forearm a distance of 2.50 cm from the elbow, what is the magnitude of the torque exerted by the biceps to hold a 44.5 N (about 10 lbs) ball at the end of the
forearm at distance of 35.0 cm from the elbow, with the forearm parallel to the floor, in N-m? Use g = 10.0 m/s².
Your answer needs to have 3 significant figures, including the negative sign in your answer if needed. Do not include the positive sign if the answer is positive. No unit is
needed in your answer, it is already given in the question statement.
driceps
Biceps
dall
>

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: Mass of forearm and weight of ball is given

VIEW

Step 2: Determining force exerted by biceps

VIEW

Step 3: Determining torque by the biceps

VIEW

Solution

VIEW

Trending now

This is a popular solution!

Step by step

Solved in 4 steps with 2 images

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

The Achilles tendon inserts on the calcaneus (the heel bone) at a distance of 8 cm from the axis of the ankle joint. If the force generated by the muscles attached to the Achilles tendon is 3000 N, and the moment arm of this force about the ankle joint is 5 cm, what torque is created by these muscles about the ankle joint? Hopefully it’s enough torque to move out of the way so the arrow doesn’t shoot through the tendon.
At the presentation ceremony, a championship bowler is presented a 1.58-kg trophy which he holds at arm's length, a distance of 0.655 m from his shoulder joint. (a) Determine the torque (in N · m) the trophy exerts about the shoulder joint when his arm is horizontal. (Enter the magnitude only.) (b) Determine the torque (in N · m) the trophy exerts about the shoulder joint when his arm is at an angle of 32.0° below the horizontal. (Enter the magnitude only.) N · m
A circular-shaped object of mass 9 kg has an inner radius of 7cm and an outer radius of 20 cm. Three forces (acting perpendicular to the axis of rotation) of magnitude 12 N,27 N, and 16 N act on the object as shown. The force of magnitude 27 N acts 29 0 below the horizontal. Find the magnitude of the net torque on the wheel about the center of the object. (HINT: DRAW THE r FROM THE CENTER OF THE WHEEL TO WHERE THE FORCE ACTS. THIS QUESTION IS TRYING TO TRICK YOU.) 12 N 29° 27 N 16 N Your answer
A simple pendulum consists of a small object of mass 3.5 kg hanging at the end of a 2.0-m-long light string that is connected to a pivot point. (a) Calculate the magnitude of the torque (due to the force of gravity) about this pivot point when the string makes a 7.0° angle with the vertical. (b) Does the torque increase or decrease as the angle increase?
(a) When opening a door, you push on it perpendicularly with a force of 44.0 N at a distance of 0.780 m from the hinges. What torque (in N-m) are you exerting relative to the hinges? (Enter the magnitude.) N-m (b) Does it matter if you push at the same height as the hinges? O Yes O No
Force F = (-7.0 N)î + (5.0 N) ĵ acts on a particle with position vector7 = (4.0 m)î + (5.0 m) ĵ. (a) What is the torque on the particle about the origin, in unit-vector notation? = N: m (b) What is the angle between the directions of r and Torque is the cross product of a position vector (extending from a chosen point, here the origin, to the particle) and a force vector. Did you take the cross product in unit-vector notation? Do you remember how find the angle between two vectors by taking a dot product in both unit-vector notation and also in magnitude-angle notation? (You can similarly use a cross product to do this.) Do you remember how to find the magnitude of a vector from its components?
The engine of an airplane drives a propeller with 2.25 m in length and a mass of 90 kg. If the engine delivers a torque of 100 N⋅m, determine the time it takes the propeller to reach 300 rev/min on start-up.
An electric motor rotating a workshop grinding wheel at 1.08 x 10 rev/min is switched off. Assume the wheel has a constant negative angular acceleration of magnitude 2.06 rad/s? (a) How long does it take the grinding wheel to stop? Note that the time required for the wheel to stop is the same as the time for the wheel to start from rest and reach the given angular speed with the same magnitude angular acceleration, s (b) Through how many radians has the wheel turned during the time interval found in part (a)? It might be helpful to translate this problems into linear variables (a car traveling with an initial speed and then slowing down with a constant negative acceleration), rad Need Help? Road Master
A compact disk (CD) accelerates from rest to 14.8 rad/s in 34 s. Assuming the CD is a uniform disk of radius 5.0 cm and mass 31 g, calculate the net torque required to accelerate it.
Real-world application. Equipment: a barbell (above 10 lbs) or a heavy book, a meter stick or Upper another length measuring instrument. Lift the Biceps barbell by doing a bicep curl. Watch the change of arm Barbell the shape of your bicep. What is the role of the bicep in lifting the barbell? Where is it attached to the arm? Consider the axis of rotation to be in the 4.0 cm elbow joint. How far away is the barbell from the axis of rotation? How far is the bicep from the 40 cm axis of rotation? Estimate the force that the biceps muscle exerts on the forearm holding the barbell. What assumptions did you make in working the problem?
A man in a gym is holding an 8.0-kg kettlebell at arm's length, a distance of 0.55 m from his shoulder joint. What is the torque about his shoulder joint due to the gravitational force on the kettlebell if his arm is held at 30° below the horizontal?
Parker is performing a squat with a barbell. Body mass is 87 kg and barbell mass is 58 kg. When they are balanced so that the point of application of the ground reaction force is in the middle of their foot, moment arm for the ground reaction force to the hip joint is 0.088 m. When they shift their weight closer to their toes that moment arm length increases to 0.127 m. How much does that weight shift increase the torque required by the hip? Give your answer as an increase in Nm and to one decimal point.