A spring with a spring constant of 0.70 N/m is stretched 1.5 m. What was the net force?
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- The 100-kg uniform rectangular plate is supported by an ideal pivot at O and a spring which must be compressed prior to being slipped into place at point A. If the modulus of the spring is k = 2,000 N/m, what must be its undeformed length L in mm?A certain spring stretches 6 cm when a load of 30 N is suspended from it. How much will the spring stretch if 50 N is suspended from it (and it doesn’t reach its elastic limit)?A spider of mass 6.3 10-4 kg hangs from a 70.9 cm long thread whose diameter is 2.0 10-3 mm. Young's modulus of thread is 3 109 N/m2. By how much does the thread stretch (in m)?
- Calculate the force a guitar tuning peg applies to stretch a steel guitar string 1.00 mm, if the wire is originally 0.850 mm in diameter and 1.2 m long? (Y = 2.10 x 1011 N/m2)If a force of 33.6 N is applied to a spring, with a spring constant of 138.2 N/m, how far will it stretch ( in meters)?Calculate the force (in N) a piano tuner applies to stretch a steel piano wire 8.10 mm, if the wire is originally 0.850 mm in diameter and 1.35 m long.
- The 90-kg uniform rectangular plate is supported by an ideal pivot at O and a spring which must be compressed prior to being slipped into place at point A. If the modulus of the spring is k = 2,200 N/m, what must be its undeformed length L in mm?A surgeon is using material from a donated heart to repair a patient's damaged aorta and needs to know the elastic characteristics of this aortal material. Tests performed on a 16.0 em strip of the donated aorta reveal that it stretches 3.75 cm when a 1.50 N pull is exerted on it. (a) What is the force constant of this strip of aortal material? (b) If the maximum distance it will be able to stretch when it replaces the aorta in the damaged heart is 1.14 cm, what is the greatest force it will be able to exert there?Many caterpillars construct cocoons from silk, one of the strongest naturally occurring materials known. Each thread is typically 2.0 µm in diameter, and the silk has a Young's modulus of 4.0 x 10° N/m2. Assuming that there is no appreciable space between the parallel strands, how many strands N would be needed to N = strands make a rope 8.6 m long that would stretch only 1.02 cm when supporting a pair of 85-kg mountain climbers? Again assuming that there is no appreciable space between the parallel strands, what would be the diameter d of the rope? d = cm
- A basket of negligible weight hangs from a vertical spring scale of force constant 1500 N/m. (a) If you suddenly put a 3.0 kg adobe brick in the basket, find the maximum distance that the spring will stretch. (b) If, instead, you release the brick from 1.0 m above the basket, by how much will the spring stretch at its maximum elongation?A spider of mass 6.3 10-4 kg hangs from a 70.9 cm long thread whose diameter is 2.0 10-3 mm. Young's modulus of thread is 3 109 N/m2. By how much does the thread stretch (in m)?A spring of unstreched length 25 cm is pulled in a horizontal direction with 150 N force. Since we apply a force in a horizontal direction, the spring is stretched to 28 cm. Now we suspend the spring from a hook in a vertical direction and attached a 15 kg mass at the bottom. How long my spring will stretch?