PH 105 Midterm: PH105 Exam2A-with-key

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turquoisegnu128

31 Jan 2019

School

University of Alabama

Department

Course

PH 105

Professor

All

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Choose the one alternative that best completes the statement or answers the question: a 1. 0-kg block and a 2. 0-kg block are pressed together on a horizontal frictionless surface with a. If the collision is perfectly elastic, what is the nal speed of the. 2. 3 -kg object: 4. 3 m/s, 0. 48 m/s, 3. 8 m/s, 7. 1 m/s, 6. 6 m/s, a 620 -g object traveling at 2. 1 m/s collides head-on with a 320 -g object traveling in the. The masses of the blocks, and the velocities. The collision is: completely inelastic, partially inelastic, perfectly elastic, characterized by an increase in kinetic energy, not possible because momentum is not conserved. Version a: a series of weights connected by very light cords are given an upward acceleration of 4. 00 m/s 2 by a pull p, as shown in the gure. A, b , and c are the tensions in the connecting cords.

Related Questions

A light spring of force constant 3.85N/m is compressed by 8.00 cmand held between a .250 kg block on the left and a .500 kg block onthe right. Both blocks are at rest on a horizontal surface. Theblocks are released simultaneously so that the spring tends to pushthem apart. What is the maximum velocity each block attains if thecoefficient of kinetic friction between each block and the surfaceis:

A) 0
B) .100
C) .463

Assume that the coefficient of static friction is larger than thatfor kinetic friction

Hint:

In the part where there is friction you know that ;

-fk.d= (Uf+Kf)- (Ui+Ki)

d= 0.08-x ; (0.08 being the compressed distance)

You have to get the frictions for the two blocks, you already knowthe force of the spring.
For the heavier block the force of the spring will be smaller thanthe friction fk, so the heavier block will stand still, and thefrictional force exerted by the floor change the momentum of thetwo blocks system. The light block will gain speed as long as thespring force is larger than the friction force, that is until thespring compresses and the magnitude of the spring force:
Fs= kx =fk (lighter spring)

A light spring with force constant 3.95 N/m is compressed by 7.68cm as it is held between a 0.263 kg block on the left and a 0.526kg block on the right, both resting on a horizontal surface. Thespring exerts a force on each block, tending to push them apart.The blocks are simultaneously released from rest. Find theacceleration with which each block starts to move, given that thecoefficient of kinetic friction between each block and the surfaceis the following values. (Let the coordinate system be positive tothe right and negative to the left. Be sure to include the sign toindicate the direction of the acceleration.)

(a) Î¼ = 0

acceleration of heavier block:
acceleration of lighter block:

(b) Î¼ = 0.010

acceleration of heavier block:
acceleration of lighter block:

(c) Î¼ = 0.138

acceleration of heavier block:
acceleration of lighter block:

I would really like to see how this is set up more than anything. Iwould assumed finding the spring potential energy (I got 0.01165J)and setting the two equal to it somehow added together? Help wouldbe much appreciated!!

PH 105 Midterm: PH105 Exam2A-with-key

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