Describe phenomenologically the origin of the contraction force that exists in a stretched rubber band. What...
Describe phenomenologically the origin of the contraction force that exists in a stretched rubber band. What is the trend of the contraction force with temperature, why ?
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Describe phenomenologically the origin of the contraction force
that exists in a stretched rubber band. What...
1. When you a place a rubber loose rubber band in contact with your lip, you...
1. When you a place a rubber loose rubber band in contact with your lip, you notice a slight increase in temperature when the rubber band is stretched. a) Is work being done by the rubber band or is work being done on the rubber? b) Since there is not any heat added or removed from the rubber band what type of thermodynamic process can you say this is? c) Using the first law of thermodynamics and your answers to...
Consider a stretched rubber band where experimental observations show that the tension f is proportional to...
Consider a stretched rubber band where experimental observations show that the tension f is proportional to temperature T if length L is held constant. Show that 1) The internal energy U is only a function of temperature. 2) adiabatic stretching of the band results in an increase in temperature. 3) the band will contract if warmed while kept under constant tension.
If an unstretched rubber band has a length of 4 inches, and it is stretched to...
If an unstretched rubber band has a length of 4 inches, and it is stretched to a length of 4.12 inches, what is the strain in %? 3% 0 1.0% o 0.5% o 4%
Consider the following observation: A rubber band is stretched under tension (at least 0.5 cm wide)...
Consider the following observation: A rubber band is stretched under tension (at least 0.5 cm wide) and then touched to the Upper lip and found to be warm. Then the rubber band is relaxed and stretched a second time and held under tension for several seconds. The rubber band is relaxed and touched to the upper lip and found to have a cooling effect. Analyze these two observation using delta G = Delta H - T delta S for the...
Problem 3 (30 points) 3.1 A rubber band, 5cm long, is stretched uniaxially to 10cm at 25C and is ...
Problem 3 (30 points) 3.1 A rubber band, 5cm long, is stretched uniaxially to 10cm at 25C and is held in this state. The stress at this length is found to increase by 1.2-10 Pa when the temperature is raised to 30°C. Assuming ideal behavior calculate (a) the concentration of elastically active strands; (b) Young's moduļus (E) at 2% ofelongation of the rubber at 25°C (E-o(at 2% of elongation)/0.02) (10 points) 3.2 Stress-strain measurements on lightly vulcanized naturally rubber sample...
4. A rubber band of dimensions 10 mm x 2 mmx 200 mm is stretched 5...
4. A rubber band of dimensions 10 mm x 2 mmx 200 mm is stretched 5 times its original length at 20�C. Calculate the heat gained or lost. The number of chains per unit m^3 is 1.9 x 10^26.Where w is the work per unit volume. Delta U = delta W + delta Q (U = internal energy of system, W = total work performed on the system. Q = heat added to the system). Hint: you need to assume...
1. A force of 2 N will stretch a rubber band 0.02 m. How far will...
1. A force of 2 N will stretch a rubber band 0.02 m. How far will a 4 N force stretch the band (assume Hooke's Law applies)? How much work does it take to stretch the band this far?
Conservation of Energy 1 Slingshot /Catapult An ordinary rubber band, similar to the ones we used in lab, has a spr...
Conservation of Energy 1 Slingshot /Catapult An ordinary rubber band, similar to the ones we used in lab, has a spring constant of 90 N/m The rubber band is used to launch a small stone. Suppose the rubber band is extended 10 cm beyond its rest position when the stone is launched, and assume that the mass of the stone is 5 g (a) Find the force needed to stretch the rubber band to 10 cm (b) Assuming that all...
Work is being done to stretch the packing tape. The force of the rubber band is...
Work is being done to stretch the packing tape. The force of the rubber band is modeled with an expression F (x) = - Fo [(L + x)/L − L2 /(L + x)2], where Fo = 9.2 N, the elastic length of the elastic band L = 0.95 m and the x is the change in the length of the elastic band. Determine how much work is done on the elastic band when stretching the distance d = 0.55 m
Describe the origin of the cardiac contraction signal and the pathway it follows through the heart.
Describe the origin of the cardiac contraction signal and the pathway it follows through the heart.
If an unstretched rubber band has a length of 4 inches, and it is stretched to a length of 4.12 inches, what is the strain in %? 3% 0 1.0% o 0.5% o 4%
Consider the following observation: A rubber band is stretched under tension (at least 0.5 cm wide) and then touched to the Upper lip and found to be warm. Then the rubber band is relaxed and stretched a second time and held under tension for several seconds. The rubber band is relaxed and touched to the upper lip and found to have a cooling effect. Analyze these two observation using delta G = Delta H - T delta S for the...
Problem 3 (30 points) 3.1 A rubber band, 5cm long, is stretched uniaxially to 10cm at 25C and is held in this state. The stress at this length is found to increase by 1.2-10 Pa when the temperature is raised to 30°C. Assuming ideal behavior calculate (a) the concentration of elastically active strands; (b) Young's moduļus (E) at 2% ofelongation of the rubber at 25°C (E-o(at 2% of elongation)/0.02) (10 points) 3.2 Stress-strain measurements on lightly vulcanized naturally rubber sample...
4. A rubber band of dimensions 10 mm x 2 mmx 200 mm is stretched 5 times its original length at 20�C. Calculate the heat gained or lost. The number of chains per unit m^3 is 1.9 x 10^26.Where w is the work per unit volume. Delta U = delta W + delta Q (U = internal energy of system, W = total work performed on the system. Q = heat added to the system). Hint: you need to assume...
1. A force of 2 N will stretch a rubber band 0.02 m. How far will a 4 N force stretch the band (assume Hooke's Law applies)? How much work does it take to stretch the band this far?
Conservation of Energy 1 Slingshot /Catapult An ordinary rubber band, similar to the ones we used in lab, has a spring constant of 90 N/m The rubber band is used to launch a small stone. Suppose the rubber band is extended 10 cm beyond its rest position when the stone is launched, and assume that the mass of the stone is 5 g (a) Find the force needed to stretch the rubber band to 10 cm (b) Assuming that all...
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