Question

Notify Me Bookmark

A helicopter lifts a 61 kg astronaut 19 m vertically from the ocean by means of a cable. The acceleration of the astronaut is g/14. How much work is done on the astronaut by (a) the force from the helicopter and (b) the gravitational force on her? Just before she reaches the helicopter, what are her (c) kinetic energy and (d) speed? (a) Number Units (b) Number Units (c) Number Units (d) Number Units

A helicopter lifts a 61 kg astronaut 19 m vertically from the ocean by means of a cable. The acceleration of the astronaut is g/14. How much work is done on the astronaut by (a) the force from the helicopter and (b) the gravitational force on her? Just before she reaches the helicopter, what are her (c) kinetic energy and (d) speed? (a) Number Units (b) Number Units (c) Number Units (d) Number Units

Image text
A helicopter lifts a 61 kg astronaut 19 m vertically from the ocean by means of a cable. The acceleration of the astronaut is g / 14 . How much work is done on the astronaut by (a) the force from the helicopter and (b) the gravitational force on her? Just before she reaches the helicopter, what are her (c) kinetic energy and (d) speed? (a) Number i Units ◻ (b) Number i Units ◻ (c) Number i ◻ Units ◻ (d) Number i ◻ Units ◻

Detailed Answer

0 0

Please enter your email here. You will get email when this question is answered by our tutor.

Doubtrix Logo

Problem is not yet solved!

Click on Notify me to get email when question is answered.

Join Doubtrix with 7-days free trial

  • Icon Correct & Verified Answers
  • Icon No AI-Generated Answers
  • Icon Video Solution for Difficult Questions
  • Icon Work With Experts to Reach at Correct Answers
Notify me Login Sign Up

Similar/Related Questions

The figure shows a ball with mass m = 0.354 kg attached to the end of a thin rod with length L = 0.597 m and negligible mass. The other end of the rod is pivoted so that the ball can move in a vertical circle. The rod is held horizontally as shown and then given enough of a downward push to cause the ball to swing down and around and just reach the vertically upward position, with zero speed there. How much work is done on the ball by the gravitational force from the initial point to (a) the lowest point, (b) the highest point, and (c) the point on the right level with the initial point? If the gravitational potential energy of the ball-Earth system is taken to be zero at the initial point, what is it when the ball reaches (d) the lowest point, (e) the highest point, and (f) the point on the right level with the initial point? (a) Number Units (b) Number Units (c) Number Units (d) Number Units (e) Number Units (f) Number Units
Solution
0 0

A yo-yo has a rotational inertia of 766 g⋅cm2 and a mass of 116 g. Its axle radius is 2.94 mm, and its string is 143 cm long. The yo-yo rolls from rest down to the end of the string. (a) What is the magnitude of its linear acceleration? (b) How long does it take to reach the end of the string? As it reaches the end of the string, what are its (c) linear speed, (d) translational kinetic energy, (e) rotational kinetic energy, and (f) angular speed? (a) Number Units (b) Number Units (c) Number Units (d) Number Units (e) Number Units (f) Number Units
Solution
0 0

A 400 g block is dropped onto a relaxed vertical spring that has a spring constant of k = 4.6 N/cm (see the figure). The block becomes attached to the spring and compresses the spring 15 cm before momentarily stopping. While the spring is being compressed, what work is done on the block by (a) the gravitational force on it and (b) the spring force? (c) What is the speed of the block just before it hits the spring? (Assume that friction is negligible.) (d) If the speed at impact is doubled, what is the maximum compression of the spring? (a) Number Units (b) Number Units (c) Number Units (d) Number Units
Solution
0 0