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Lightning As a crude model for lightning, consider the ground to be one plate of a parallel-plate capacitor and a cloud at an altitude of 680m to be the other plate. Assume the surface area of the cloud to be the same as the area of a square that is 0.40km on a side. (Dielectric strength of air is 3.0*10^6 V/m) A)What is the capacitance of this capacitor? B) How much charge can the cloud hold before the dielectric strength of the air is exceeded and a spark (lightning) results?
Two ocean liners, each with a mass of 38,000 metric tons, are moving on parallel courses, 92 m apart. What is the magnitude of the acceleration of one of the liners toward the other due to their mutual gravitational attraction? Treat the ships as par..
A baseball is hit with a speed of 30ms-1 at an angle of 40degrees. It land`s on the flat roof of a nearby building with a height of 14 m. If the ball was hit when it was 1.40 m above the ground, what horizontal distance does it travel before it la..
What type of car was involved in the hit and run
A laser with wavelength d/8 is shining light on a double slit with slit separation 0.3 {rm mm}. This results in an interference pattern on the screen a distance L away from the slits. We wish to shine a second laser, with a different wavelength, t..
A string is 80.0 cm long and has a mass per unit length of 5.51 × 10-4 kg/m. The tension in the string is 200 N. In the fundamental mode, at what frequency does the string vibrate? Answer A) 376 Hz B) 450 Hz C) 598 Hz D) 702 Hz E) 964 Hz
A horizontal pipe contains water at a pressure of 150 {rm kPa} flowing with a speed of 1.30 {rm m/s}. The pipe narrows to one-half its original diameter. What is the speed of the water.
A father (m = 70 kg) and son (m = 45 kg) are standing facing each other on a frozen pond. The son pushes on the father and finds himself moving backward at 3 m/s after they have separated. How fast will the father be moving.
The automobile afterwards undergoes a uniform acceleration of -4 m/s2 because of a red light and comes to rest. It remains at rest for 54.6s and next accelerates back to a speed of 25.6m/s at a rate of 2.85m/s2.
The K-shell ionization energy of copper is 8979 eV. The L-shell ionization energy is 951 eV. Determine the wavelength of the Kα emission line of copper. What should be the minimum voltage be on an x-ray tube with a copper target in order to see the K..
A race car has a mass of 718 kg. It starts from rest and travels 45.0 m in 3.0 s. The car is uniformly accelerated throughout the entire time. What net force is exerted on it.
What will be the vertical position of the boat. In the frame of reference of the truck, at what angle to the vertical does the boy throw can.
A motorist suddenly notices a stalled car and slams on the brakes, negatively accelerating at 6.2 . Unfortunately this isn't enough, and a collision ensues.
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