Question

A small block on a frictionless, horizontal surface has a mass of 2.70×10−2 kg . It...

A small block on a frictionless, horizontal surface has a mass of 2.70×10−2 kg . It is attached to a massless cord passing through a hole in the surface (Figure 1). The block is originally revolving at a distance of 0.300 m from the hole with an angular speed of 2.33 rad/s . The cord is then pulled from below, shortening the radius of the circle in which the block revolves to 0.150 m. Model the block as a particle.

a)Is angular momentum of the block conserved?

b)What is the new angular speed?

c)Find the change in kinetic energy of the block.

Express your answer with the appropriate units.

d)How much work was done in pulling the cord?

Express your answer with the appropriate units

Science   Physics   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

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
A small block on a frictionless, horizontal surface has a mass of 2.50×10−2 kg . It...
A small block on a frictionless, horizontal surface has a mass of 2.50×10−2 kg . It is attached to a massless cord passing through a hole in the surface (Figure 1) . The block is originally revolving at a distance of 0.300 m from the hole with an angular speed of 2.33 rad/s . The cord is then pulled from below, shortening the radius of the circle in which the block revolves to 0.150 m. Model the block as a...
A small block on a frictionless, horizontal surface has a mass of 2.90×10−2 kg . It...
A small block on a frictionless, horizontal surface has a mass of 2.90×10−2 kg . It is attached to a massless cord passing through a hole in the surface (Figure 1). The block is originally revolving at a distance of 0.300 m from the hole with an angular speed of 2.53 rad/s . The cord is then pulled from below, shortening the radius of the circle in which the block revolves to 0.150 m. Model the block as a particle....
A small block on a frictionless, horizontal surface has a mass of 2.50×10−2 kg . It...
A small block on a frictionless, horizontal surface has a mass of 2.50×10−2 kg . It is attached to a massless cord passing through a hole in the surface (Figure 1) .The block is originally revolving at a distance of 0.300 mfrom the hole with an angular speed of 2.99 rad/s . The cord is then pulled from below, shortening the radius of the circle in which the block revolves to 0.150 m. Model the block as a particle. -Find...
A block of mass 1.970  kg is free to slide on a frictionless, horizontal surface. A cord...
A block of mass 1.970  kg is free to slide on a frictionless, horizontal surface. A cord attached to the block passes over a pulley whose diameter is 0.150  m , to a hanging book with mass 3.030  kg . The system is released from rest, and both the book and the block are observed to move a distance 1.19  m over a time interval of 0.780  s ; at the instant at which that distance is measured, the book is still moving downwards and...
A block rests on a frictionless horizontal surface and is attached to a spring. When set...
A block rests on a frictionless horizontal surface and is attached to a spring. When set into simple harmonic motion, the block oscillates back and forth with an angular frequency of 8.9 rad/s. The drawing shows the position of the block when the spring is unstrained. This position is labeled ''x = 0 m.'' The drawing also shows a small bottle located 0.080 m to the right of this position. The block is pulled to the right, stretching the spring...
A wooden block of mass Mresting on a frictionless horizontal surface is attached to a rigid...
A wooden block of mass Mresting on a frictionless horizontal surface is attached to a rigid rod of length land of negligible mass, as shown in the figure to the right.The rod is pivoted at the other end. A bullet of mass mtraveling parallel to the horizontal surface and normal to the rod with speed vhits the block and becomes embedded in it.(a)What is the linear momentum of the bullet-block system?(b)What is the angular momentum of the bullet-block system?(c)Is the...
1.A 1.10 kg block sliding on a horizontal frictionless surface is attached to a horizontal spring...
1.A 1.10 kg block sliding on a horizontal frictionless surface is attached to a horizontal spring with k = 490 N/m. Let x be the displacement of the block from the position at which the spring is unstretched. At t = 0 the block passes through x = 0 with a speed of 3.40 m/s in the positive x direction. What are the (a) frequency and (b) amplitude of the block's motion 2.A vertical spring stretches 13 cm when a...
1. Consider the diatomic nitrogen molecule N2, which is rotating in the xy plane about the...
1. Consider the diatomic nitrogen molecule N2, which is rotating in the xy plane about the z axis passing through its center, perpendicular to its length. The mass of each nitrogen atom is about m= 2.40×10-26 kg, and at room temperature, the separation between the two-nitrogen atom is d = 1.32×10-10 m. A typical speed of a molecule is 4.60×1012 rad/s. If the nitrogen molecule is rotating with this angular speed about the z axis, what is its rotational kinetic...
A block rests on a horizontal, frictionless surface. A string is attached to the block, and...
A block rests on a horizontal, frictionless surface. A string is attached to the block, and is pulled with a force of 48.0 N at an angle θ above the horizontal. After the block is pulled through a distance of 16.0 m its speed is v = 2.10 m/s, and 40.0 J of work has been done on it.What is the mass of the block? (Answer in kg)
A wheel (disk) of radius 0.2 m and mass 1 kg are mounted on a frictionless...
A wheel (disk) of radius 0.2 m and mass 1 kg are mounted on a frictionless horizontal axis. A massless cord is wrapped around the wheel and attached to a 2 kg object that slides on a frictionless surface inclined at an angle of 60 degrees with the horizontal. What is the acceleration of the block as well as the angular acceleration of the wheel about its axis of rotation? Answer: 6.93 m/s^2, 34.64 rad/s^2
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT