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Figure 12-58 shows an approximate plot of stress versus strain for a spider-web thread, out to the point of breaking at a strain of 2.00. The vertical axis scale is set by a = 0.12 GN/m2, b = 0.30 GN/m2, and c = 0.80 GN/m2. Assume that the thread has an initial length of 0.80 cm, an initial cross-sectional area of 8.0 x 10-12 m2, and (during stretching) a constant volume. Assume also that when the single thread snares a flying insect, the insect"s kinetic energy is transferred to the stretching of the thread.
(a) How much kinetic energy would put the thread on the verge of breaking? What is the kinetic energy of
(b) a fruit fly of mass 6.00 mg and speed 1.70 m/s and
(c) a bumble bee of mass 0.388 g and speed 0.420 m/s? Would
(d) the fruit fly and
(e) the bumble bee break the thread?
An airplane is flying with a velocity of 95 at an angle of 19 above the horizontal. When the plane is a distance 111 m directly above a dog that is standing on level ground, suitcase drops out of luggage compartment.
how long after the big bang did it take the universe to cool to the threshold temperature for the formation of muons?
A convex Lens of focal length 18 cm is used as the magnifying glass. At what distance from a tiny insect should you hold this lens to get a magnification of +3.00.
Radioactive phorsporous-32 has been used to study bone metabolism and for the treatment of blood diseases. What is the activity of a sample of 12.2x10^16 atoms if it has a half-life of 109 days?
512 g of an unknown metal at a temperature of 15 degrees celsius is dropped into a 100 g aluminum container holding 325
When a phonograph turntable is switched off, it comes to rest from its original 33 1/3 rev/min in 4.85 s. What is the magnitude of the angular deceleration, assuming that it is constant while the turntable comes to rest?
Some GRIN material is made in the form of a doughnut. The inside diameter (the diameter of the hole in the doughnut) is 34 cm, What should be the highest, and the lowest refractive index of the material
A pair of narrow, parallel slits separated by 0.280 mm is illuminated by the green component from a mercury vapor lamp (? = 546.1 nm). Calculate the distance between the first and second dark bands in the interference pattern
A potter's wheel -- a thick stone disk of radius 0.500 m and mass 120 kg -- is freely rotating at 50.0 rev/min. Find the effective coefficient of kinetic friction between the wheel and the rag
A uniform rectangular bookcase of height 1.63 m and width 1.03 m is to be pushed at a constant velocity across a level floor. The bookcase is pushed horizontally at its top edge, at the distance H above the floor.
An 18.9 kilogram block is dragged over a rough, horizontal surface by a constant force of 118 Newton acting at an angle of 31o above the horizontal. Calculate the work done by the 118 N force
Squid use jet propulsion for rapid escapes. A squid pulls water into its body and then rapidly ejects the water backward to propel itself forward. What is the magnitude of the force on the water being ejected
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