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Author Question: A 0.30-kg block of wood is suspended on a spring. In equilibrium the wood stretches the spring 2.0 ... (Read 252 times)

awywial

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on: Jul 29, 2018
A 0.30-kg block of wood is suspended on a spring. In equilibrium the wood stretches the spring 2.0 cm downward.
 
  The wood is then pulled an additional distance of 1.0 cm down and released from rest.
  (a) How long does it take the wood to make 3 complete cycles of vibration?
  (b) How much total mechanical energy does this system contain if we choose the total potential energy (elastic and gravitational) to be zero at the equilibrium position of the hanging block?

Question 2

A beaker of negligible heat capacity contains 456 g of ice at -25.0C. A lab technician begins to supply thermal energy through the process of heating to the container at the rate of 1000 J/min.
 
  How long after starting will the ice begin to melt, assuming all of the ice has the same temperature? The specific heat of ice is 2090 J/kg  K and the latent heat of fusion of water is 33.5  104 J/kg.


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joanwhite

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Reply #1 on: Jul 29, 2018
Answer to Question 1

(a) 0.84 s (b) 7.4 mJ

Answer to Question 2

23.8 min


awywial

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Reply 2 on: Jul 29, 2018
Gracias!

Jsherida

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Reply 3 on: Yesterday
Wow, this really help

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