Temperature has a relatively unusual effect on rubber. Assume that the rubber band is governed mainly...

Temperature has a relatively unusual effect on rubber. Assume that the rubber band is governed mainly by entropic elasticity, what do you expect about a stretched rubber band when heated? Why?

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samet mamat answered 2 years ago

To study the effect of curing temperature on shear strength of a certain rubber compound, 80...

To study the effect of curing temperature on shear strength of a certain rubber compound, 80 specimens were cured at 150°C and 105 were cured at 130°C. The specimens cured at 150°C had an average shear strength of 620 psi, with a standard deviation of 20 psi. Those cured at 130°C had an average shear strength of 750 psi, with a standard deviation of 30 psi. Let μXμX represent the population mean strength for the specimens cured at 130°C and...

Consider an ideal massless rubber-band which has an upstretched ‘l’. A roll of 50 pennies of...

Consider an ideal massless rubber-band which has an upstretched ‘l’. A roll of 50 pennies of total mass mpis attached to the rubber band. The new stretched length of the rubber band with the pennies hanging down from the end of the rubber band is 1: Assume the rubber band satisfies Hookes’ law when it is stretched, what is the spring constant of the rubber band? A small nut with mass with the mass mnis then attached to the rubber...

A stretched-out polymer has lower entropy than a contracted one (think back to the rubber band...

A stretched-out polymer has lower entropy than a contracted one (think back to the rubber band problem). Applying mechanical forces to a polymer stretches it out, and it is also more likely to react by breaking bonds along the polymer chain (compared to the contracted case). a. Draw the reaction energy profile for the zero-force and mechanically biased cases. b. Use the Arrhenius expression to explain why the mechanochemical bond breaking is faster

Explain why temperature has an effect on reaction rate. Explain why concentration has an effect on...

Explain why temperature has an effect on reaction rate. Explain why concentration has an effect on reaction rate.

A physician wants to test if temperature has an effect on heart rate. In order to...

A physician wants to test if temperature has an effect on heart rate. In order to do this, she compares the heart rates in beats per minute of several random volunteers after a period of time in a room with a temperature of 50∘F and after a period of time in a room with a temperature of 75∘F. Suppose that data were collected for a random sample of 11volunteers, where each difference is calculated by subtracting the heart rate in...

which of the following statements about the chemical kinetics are true/ a) temperature has no effect...

which of the following statements about the chemical kinetics are true/ a) temperature has no effect on the rate of a reaction b) changes in reactant concentration do not affect the rate at which a reaction occurs c) the addition of a catalyst to a reaction will speed up the reaction but it will not ultimately result in a larger mass of product d) for the same reactants, the larger the surface area, the slower a reaction will occur why?

QUESTION 16. A researcher wants to test if temperature has an effect on eating behavior. Under...

QUESTION 16. A researcher wants to test if temperature has an effect on eating behavior. Under room temperature conditions, rats eat an average of μ = 10 grams of food each day. The researcher selects a random sample of rats and places them in a controlled habitat with the temperature maintained at 90°F (much hotter than room temperature). The daily food consumption for each of the rats in the sample is as follows: Food Consumption (in grams) 9.1 8.3 7.6...

Assume that a firm produces organic waste that has the effect of increasing the fertility of...

Assume that a firm produces organic waste that has the effect of increasing the fertility of neighbouring farmland and thus reducing the farmers’ costs. It is impractical, however, to sell the waste to the farmers. The following table shows the firm’s private marginal costs and these external benefits to farmers from the firm’s production. Output (units) Price (£) Marginal (private) costs (£) Marginal external benefit (£) Marginal social cost (£) 1 2 3 4 5 6 7 8 9 10 ...

Alloy element content has an effect on the ductile-to-brittle transition temperature of a steel. How does...

Alloy element content has an effect on the ductile-to-brittle transition temperature of a steel. How does increasing the Mn content of a steel affect the transition temperature?

Assume that liquid water has a temperature-independent capacity of 75 J mol-1K-1, and that for the...

Assume that liquid water has a temperature-independent capacity of 75 J mol-1K-1, and that for the transition below no heat is lost to the surroundings and the processes are reversible. a. Calculate the chnge in entropy when 1 mol of liquid water is cooled from 100C to 50 C. b. Calculate the change in entropy of the system when 1 mol of liquid water at 100C is brought into contact with 1 mol of liquid water at 0C.

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