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In the stratospheric level of the atmosphere there is a high level of ozone, O3. This ozone absorbs much of the ultraviolet light from the sun and thus protects life in the surface of the Earth from harmful high level of ultraviolet radiation. Explain why one chlorofluorocarbon (CFC) molecule in the ozone layer is capable of breaking down hundreds and even thousands of ozone molecules?
Illustrate what are some pros and cons of the kitchen-sink reporting model? Illustrate what are some pros and cons of the minimalist reporting model? Explain and give examples for both.
Big yellow fishing swimming at 2.0m/s swallows little green fish at rest. What fraction of big yellow fish's initial kinetic energy was lost is this collision
How do you find the period of a binary star system?
A submarine is stranded on the bottom of the ocean with its hatch 27.0 m below the surface. Calculate the force (in N) needed to open the hatch from the inside.
Two people push a stalled car at its front doors, each applying a 260 N force at 25 degree to the forward direction. How much work does each person do pushing car 5.5 m.
A guitar string, 2.50 meters long has a mass of 0.458 grams. If a tension of 276N is put on the string, what will the speed of sound in the string be? When the guitar is strung, it is 0.576 m from the bridge to the last fret ( from node to node).
When the Sun is straight overhead, a hawk dives toward the ground with the constant velocity of 4.50 m/s at 52° below the horizontal. Compute the speed of her shadow on the level ground.
A space vehicle is traveling at 5900 km/h relative to the Earth when the exhausted rocket motor is disengaged and sent backward with a speed of 99 km/h relative to the command module. The mass of the motor is four times the mass of the module. What i..
A particle having an electric charge q = 3.20 x 10-19 C is injected into a magnetic field B = 0.44 T with a speed of 1.61 x 107 meter per second. Determine how great an electric field would be required to exert an electrostatic force with the same m..
A cylindrical copper cable carries a current of 1290 A. There is a potential difference of 1.60 10-2 V, What is the radius of the cable
A transformer connected to a 240 volt a.c mains is used to light a 12V/36W lamp.a) what current does the lamp need to light normally?
What is the magnitude of the Coulomb force between a charge of +0.60 C which is separated by 3.0 m from a second charge of -0.20 C and isolated.
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