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If an unstretched rubber band has a length of 4 inches, and it is stretched to...
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...
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.
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...
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 ?
A ball of mass m is connected to one end of a rubber band and swung...
A ball of mass m is connected to one end of a rubber band and swung in a circle. The rubber band has spring constant k, and its unstretched length is r0. If it is swung at an angular velocity ω, to what length will it stretch the rubber band? Please use energy if you can !! I started to try it using spring potential = rotational kinetic and used I = mr^2 for moment of inertia. but if i...
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...
A spring has an unstretched length of 11 cm . It exerts a restoring force F...
A spring has an unstretched length of 11 cm . It exerts a restoring force F when stretched to a length of 12 cm. For what total stretched length of the spring is its restoring force 3F? At what compressed length is the restoring force 2F?
A spring has an unstretched length of 9 cm. It exerts a restoring force F when...
A spring has an unstretched length of 9 cm. It exerts a restoring force F when stretched to a length of 11 cm. Part 1 For what total stretched length of the spring is its restoring force 3F? (In 2 sig figs and cm) Part 2 At what compressed length is the restoring force 2F? (In 2 sig figs and cm)
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...
12. The tension in a stretched rubber cord, of mass 12 grams and length 2 meters,...
12. The tension in a stretched rubber cord, of mass 12 grams and length 2 meters, is 54 mN. What is the speed of a transverse wave ? a) 2.1 m/s b) 3.0 m/s c) 4.5 m/s d) 9.0 ms
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...
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...
12. The tension in a stretched rubber cord, of mass 12 grams and length 2 meters, is 54 mN. What is the speed of a transverse wave ? a) 2.1 m/s b) 3.0 m/s c) 4.5 m/s d) 9.0 ms
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