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Homework 12

# Homework 12 - homework 12 ALIBHAI ZAHID Latest unpenalized...

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homework 12 – ALIBHAI, ZAHID 1 Latest unpenalized work: Apr 16 2007 Mon- day 04:00 (after this date you can not make a perfect score). Work cutoff: Apr 18 2007, 4:00 am. Question 1 part 1 of 1 10 points A block of mass 4 kg is hung from a spring, causing it to stretch 8 cm at equilibrium, as shown below. The 4 kg block is then replaced by a 6 kg block, and the new block is released from the position shown below, at which point the spring is unstretched. The acceleration of gravity is 9 . 8 m / s 2 . 8 cm y max 4 kg equilbrium 6 kg How far will the 6 kg block fall before its direction is reversed? Hint: For the new block case, the total distance of fall is twice the amplitude of the oscillation. Answer in units of cm. Question 2 part 1 of 1 10 points Quantum concepts are critical in explaining all of the following EXCEPT 1. Compton scattering. 2. Bohr’s theory of the hydrogen atom. 3. Rutherfold’s scattering experiments. 4. the blackbody spectrum. 5. the photoelectric effect. Question 3 part 1 of 2 10 points A 1 . 24 kg block at rest on a tabletop is at- tached to a horizontal spring having constant 16 . 1 N / m. The spring is initially unstretched. A constant 27 . 7 N horizontal force is applied to the object causing the spring to stretch. The acceleration of gravity is 9 . 8 m / s 2 . 27 . 7 N 1 . 24 kg 16 . 1 N / m Find the speed of the block after it has moved 0 . 26 m from equilibrium if the surface between block and tabletop is frictionless. Answer in units of m / s. Question 4 part 2 of 2 10 points Find the speed of the block after it has moved 0 . 26 m from equilibrium if the coef- ficient of kinetic friction between block and tabletop is 0 . 114. Answer in units of m / s. Question 5 part 1 of 2 10 points A(n) 5 . 2 g bullet moving with an initial speed of 472 m / s is fired into and passes through a 0 . 87 kg block. The block, initially at rest on a frictionless horizontal surface, is connected to a spring with a spring constant of 726 N / m. The block moves 4 . 17 cm to the right after impact.

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homework 12 – ALIBHAI, ZAHID 2 726 N / m 0 . 87 kg 5 . 2 g 472 m / s Find the speed at which the bullet emerges from the block. Answer in units of m / s. Question 6 part 2 of 2 10 points How much mechanical energy was lost in the collision? Answer in units of J. Question 7 part 1 of 1 10 points A uniform plank of mass m is pivoted at one end. A spring of force constant k is attached to the center of the plank, as shown in the figure. The height of the pivot has been adjusted so that the plank will be in equilibrium when it is horizontally oriented.
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