Question

In a knee extension exercise the knee is extended with a constant angular velocity. What can...

In a knee extension exercise the knee is extended with a constant angular velocity. What can be said about the relative acceleration of the ankle with respect to the knee?

1. The tangential acceleration is 0 but the centripetal acceleration is not 0.

2. The tangential acceleration is not 0 but the centripetal acceleration is 0.

3. Neither one is 0.

4. The magnitude of this acceleration vector is 0.

Science   Physics   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

Option 1 is correct answer ,since angular velocity of the leg is constant that means the tangential speed is constant given by

So rate of change of speed in tangential direction is zero so tangential acceleration is zero.

Now since tangential velocity is changing that causes raterate of change of velocity because of change of its direction but constant magnitude and this acceleration is equal to centripetal acceleration

Given by

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
An internal mechanism is used to maintain a constant angular rate Ω = 0.05 rad/s about...
An internal mechanism is used to maintain a constant angular rate Ω = 0.05 rad/s about the z-axis of the spacecraft as the telescopic booms are extended at a constant rate. The length l is varied from essentially zero to 3 m. The maximum acceleration to which the sensitive experiment modules P may be subjected is 0.011 m/s^2. Calculate the velocity of P when the boom in fully extended 1-Calculate the velocity of P when the boom in fully retracted...
A cylinder rotating about its axis with a constant angular acceleration of 1.6 rad/s^2 starts from...
A cylinder rotating about its axis with a constant angular acceleration of 1.6 rad/s^2 starts from rest at t=0. At the instant when it has turned through 0.40 radian, find the magnitude of the tangential velocity at point on the rim (radius=0.15 m)?
A 44.0-cm diameter disk rotates with a constant angular acceleration of 3.00 rad/s2. It starts from...
A 44.0-cm diameter disk rotates with a constant angular acceleration of 3.00 rad/s2. It starts from rest at t = 0, and a line drawn from the center of the disk to a point P on the rim of the disk makes an angle of 57.3° with the positive x-axis at this time. (a) At t = 2.48 s, find the angular speed of the wheel. rad/s (b) At t = 2.48 s, find the magnitude of the linear velocity...
Pls, show answer legible. 1. If a tire rolls with a constant velocity westward, in what...
Pls, show answer legible. 1. If a tire rolls with a constant velocity westward, in what direction is its angular velocity? Describe your method for finding this. 2. Can angular velocity have more than one component? Give an example to support your answer. 3. Is the direction of the angular velocity of the earth towards the North Pole, toward the South Pole, or neither of these? Explain.
At t = 0, a flywheel has an angular velocity of 4.3 rad/s, a constant angular...
At t = 0, a flywheel has an angular velocity of 4.3 rad/s, a constant angular acceleration of -0.26 rad/s2, and a reference line at ?0 = 0. (a) Through what maximum angle ?max will the reference line turn in the positive direction? (b) At what times t will the line be at ? = 1/2 ?max (consider both positive and negative values of t) (c) At what times t will the line be at ? = -10.7 rad (consider...
Question 3 Caculate the angular velocity for time point 4. Timpe Point Time (s) Displacement (rad)...
Question 3 Caculate the angular velocity for time point 4. Timpe Point Time (s) Displacement (rad) 1 0 0 2 2.7 0.44 3 5.6 1.69 4 8.48 4.51    Question 4 What is the tangential velocity if an object is rotating at 302 degrees/s and has a radius of rotation of 2.6 m (to one decimal place)?
A car travels around a horizontal circular driveway at a constant speed of 4 m/s. Which...
A car travels around a horizontal circular driveway at a constant speed of 4 m/s. Which one of the following statements is correct? 1.) The car's acceleration is zero. 2.)The car's velocity is constant but not zero. 3.)The car's acceleration is not zero. 4.)The car's position vector relative to a fixed origin is constant. 5.)The car's velocity is zero.
A flywheel with a radius of 0.500 m starts from rest and accelerates with a constant...
A flywheel with a radius of 0.500 m starts from rest and accelerates with a constant angular acceleration of 0.700 rad/s2 . 1.Compute the magnitude of the tangential acceleration of a point on its rim at the start. 2.Compute the magnitude of the radial acceleration of a point on its rim at the start. 3.Compute the magnitude of the tangential acceleration of a point on its rim after it has turned through 60.0 ?. 4.Compute the magnitude of the radial...
At t=0 a grinding wheel has an angular velocity of 21.0 rad/s . It has a...
At t=0 a grinding wheel has an angular velocity of 21.0 rad/s . It has a constant angular acceleration of 33.0 rad/s2 until a circuit breaker trips at time t = 1.70 s . From then on, it turns through an angle 440 rad as it coasts to a stop at constant angular acceleration. 1.Through what total angle did the wheel turn between t=0 and the time it stopped? 2.At what time did it stop? 3.What was its acceleration as...
In this example we see how a system can have constant angular momentum without having a...
In this example we see how a system can have constant angular momentum without having a constant angular velocity! A physics professor stands at the center of a turntable, holding his arms extended horizontally, with a 5.0 kg dumbbell in each hand (Figure 1). He is set rotating about a vertical axis, making one revolution in 2.0 s. His moment of inertia (without the dumbbells) is 3.4 kg⋅m2 when his arms are outstretched, and drops to 1.8 kg⋅m2 when his...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT