To develop muscle tone, a woman lifts a 4.50 kg weight held in her hand. She...
To develop muscle tone, a woman lifts a 4.50 kg weight held in her hand. She uses her biceps muscle to flex the lower arm through an angle of 60.0°.
a) What is the angular acceleration (in rad/s2) if the weight is 24.0 cm from the elbow joint, her forearm has a moment of inertia of 0.250 kg · m2, and the net force she exerts is 500 N at an effective perpendicular lever arm of 2.20 cm? (Ignore gravity)
_______ rad/s2
b) How much work (in J) does she do?
_______ J
Homework Answers
Add Answer to:
To develop muscle tone, a woman lifts a 4.50 kg weight held in
her hand. She...
A 75.0 kg weight lifter is doing arm raises using a 7.50 kg weight in her...
A 75.0 kg weight lifter is doing arm raises using a 7.50 kg weight in her hand. Her arm pivots around the elbow joint, starting 40.0 below the horizontal. (See the figure (Figure 1).) Biometric measurements have shown that both forearms and the hands together account for 5.75% of a person's weight. Since the upper arm is held vertically, the biceps muscle always acts vertically and is attached to the bones of the forearm 5.50 cm from the elbow Part...
Constants A 71.0 kg weight lifter is doing arm raises using a 7.50 kg weight in...
Constants A 71.0 kg weight lifter is doing arm raises using a 7.50 kg weight in her hand. Her arm pivots around the elbow joint, starting 40.0 below the horizontal. (See the figure(Figure 1).) Biometric measurements have shown that both forearms and the hands together account for 6.40 % of a person's weight. Since the upper arm is held vertically, the biceps muscle always acts vertically and is attached to the bones of the forearm 5.50 cm from the elbow...
Part A A 75.0 kg weight lifter is doing arm raises using a 7.50 kg weight...
Part A A 75.0 kg weight lifter is doing arm raises using a 7.50 kg weight in her hand. Her arm pivots around the elbow joint, starting 40.0° below the horizontal (See the figure(Figure 1).) Biometric measurements have shown that both forearms and the hands together account for 5.75 % of a person's weight. Since the upper arm is held vertically, the biceps muscle always acts vertically and is attached to the bones of the forearm 5.50 cm from the...
A woman lifts a 3.6-kg barbell in each hand with her arm in a horizontal position...
A woman lifts a 3.6-kg barbell in each hand with her arm in a
horizontal position at the side of her body and holds it there for
3 s (see the figure below).
What force does the deltoid muscle in her shoulder exert on the
humerus bone while holding the barbell? The deltoid attaches 13 cm
from the shoulder joint and makes a 13? angle with the humerus. The
barbell in her hand is 0.55 m from the shoulder joint,...
3. Leighton is attempting a biceps curl with a 10 kg dumbbell. She is standing upright,...
3. Leighton is attempting a biceps curl with a 10 kg dumbbell. She is standing upright, and her forearm is horizontal. The moment arm of the dumbbell about Leighton's elbow joint is 28.5 cm a What torque is created by the dumbbell about the elbow joint? b. What torque is created by Leighton's elbow flexor muscles to hold the dumbbell in this position? Ignore the weight of her arm and hand. C. If the elbow flexor muscles contract with a...
A soccer player extends her lower leg in a kicking motion by exerting a force with...
A soccer player extends her lower
leg in a kicking motion by exerting a force with the muscle above
the knee in the front of her leg. Suppose she produces an angular
acceleration of 32 rad/s2 and her lower leg has a moment
of inertia of 0.75 kg⋅m2 .
What is the force, in
newtons, exerted by the muscle if its effective perpendicular lever
arm is 2.05 cm?
F =
A 75.0 kg weight lifter is doing arm raises using a 7.50 kg weight in her hand. Her arm pivots around the elbow joint, starting 40.0 below the horizontal. (See the figure (Figure 1).) Biometric measurements have shown that both forearms and the hands together account for 5.75% of a person's weight. Since the upper arm is held vertically, the biceps muscle always acts vertically and is attached to the bones of the forearm 5.50 cm from the elbow Part...
Constants A 71.0 kg weight lifter is doing arm raises using a 7.50 kg weight in her hand. Her arm pivots around the elbow joint, starting 40.0 below the horizontal. (See the figure(Figure 1).) Biometric measurements have shown that both forearms and the hands together account for 6.40 % of a person's weight. Since the upper arm is held vertically, the biceps muscle always acts vertically and is attached to the bones of the forearm 5.50 cm from the elbow...
Part A A 75.0 kg weight lifter is doing arm raises using a 7.50 kg weight in her hand. Her arm pivots around the elbow joint, starting 40.0° below the horizontal (See the figure(Figure 1).) Biometric measurements have shown that both forearms and the hands together account for 5.75 % of a person's weight. Since the upper arm is held vertically, the biceps muscle always acts vertically and is attached to the bones of the forearm 5.50 cm from the...
A woman lifts a 3.6-kg barbell in each hand with her arm in a
horizontal position at the side of her body and holds it there for
3 s (see the figure below).
What force does the deltoid muscle in her shoulder exert on the
humerus bone while holding the barbell? The deltoid attaches 13 cm
from the shoulder joint and makes a 13? angle with the humerus. The
barbell in her hand is 0.55 m from the shoulder joint,...
3. Leighton is attempting a biceps curl with a 10 kg dumbbell. She is standing upright, and her forearm is horizontal. The moment arm of the dumbbell about Leighton's elbow joint is 28.5 cm a What torque is created by the dumbbell about the elbow joint? b. What torque is created by Leighton's elbow flexor muscles to hold the dumbbell in this position? Ignore the weight of her arm and hand. C. If the elbow flexor muscles contract with a...
A soccer player extends her lower
leg in a kicking motion by exerting a force with the muscle above
the knee in the front of her leg. Suppose she produces an angular
acceleration of 32 rad/s2 and her lower leg has a moment
of inertia of 0.75 kg⋅m2 .
What is the force, in
newtons, exerted by the muscle if its effective perpendicular lever
arm is 2.05 cm?
F =
Most questions answered within 3 hours.
-
1. (15%) Describe the difference between a pull (Kanban), push
and CONWIP production systems.
asked 1 minute ago -
How does a linear regression allow you to better estimate
trends, costs, and other factors in...
asked 4 minutes ago -
QUESTION 5
The total area under the Z distribution curve is equal to:
a.
10
b....
asked 10 minutes ago -
Using Python
The variables x and y refer to numbers. Write a code segment
that prompts...
asked 24 minutes ago -
If
the coefficient of static friction between a box and the floor is
0.35 with what...
asked 26 minutes ago -
A die is designed to punch holes with a radius of 1.08 10-2 m in
a...
asked 31 minutes ago -
government can increase import through
a. export subsidies
b. tax breaks
c. increase import tax
d....
asked 31 minutes ago -
Draw the following in the proper skeletal structure or line
angle formula.
5,6,6-tribromo-3,8-dicyclopropyl-7-isopentyldodecane
asked 36 minutes ago -
Two blocks of masses m1 and m2 hang at the ends of a string that
passes...
asked 37 minutes ago -
Linear programming is an excellent technique yet is not applied
nearly enough in the “real world.”...
asked 46 minutes ago -
What three alkenes yield 3-methylpentane on catalytic
hydrogenation?
asked 46 minutes ago -
In JAVA Create a program with an array with the following
data:
50 12 31 76...
asked 48 minutes ago