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Q. A strong lightning bolt transfers about 25 C to Earth. a) How many electrons are transferred. b)If each water molecule donates one electron, what mass lost an electron to the lightening? One mole of water has a mass of 18 g.
Q. A car is traveling 72.0 km/h when the driver applies the brakes. If if the car slows down uniformly with an acceleration of -4.5 m/s2, how far does the car travel before coming to rest?
What is the tangential acceleration of a bug on the rim of a 13.0-in.-diameter disk if the disk accelerates uniformly from rest to the angular speed of 76.0 rev/min in 3.50 s.
What is x and y coordinates of the shell
A golf ball strikes a hard, smooth floor at an angle of 30 ° and, as the drawing shows, rebounds at the same angle. The mass of the ball is 0.047 kg, its speed is 45 m/s just before and after striking the floor. What is the magnitude of the impuls..
A 2.10 sound wave travels through a pregnant woman's abdomen and is reflected from the fetal heart wall of her unborn baby. The heart wall is moving toward sound receiver as the heart beats. The reflected sound is then mixed with the transmitted soun..
An Indy car with a speed of 120km/h goes around a level, circular track with a radius of 1km. What is centripetal acceleration of the car.
How will their speeds to relate to each other when they land? Ignore air resistance. Clarify with graph. Draw a graph and explain why it happens.
A 115 granite cube slides down a 35 frictionless ramp. At the bottom, just as it exits onto a horizontal table, it collides with a 235 steel cube at rest.
White light containing wavelengths from 405 nm to 760 nm falls on a grating with 8000 lines/cm. How wide is the first-order spectrum on a screen 2.20m away.
A 30-06 caliber hunting rifle fires a bullet of mass 0.0122 kg with a velocity of 247 m/s to the right. The rifle has a mass of 3.2 kg. What is the recoil speed of the rifle as bullet leaves the rifle.
Compute the index of refraction of the gas
The heat of vaporization of ethyl alcohol is about 200 cal/g. If 2.8kg of it were allowed to vaporize in the refrigerator, how many grams of ice would be formed from 0 °C water.
A passenger train is travelling at 31 m/s when the engineer sees a freight train 351 m ahead of his train travelling in the same direction on the same track. The freight train is moving at a speed of 5.6 m/s.
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