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Earth's atmosphere is constantly bombarded by cosmic ray protons that originate somewhere in space. If the protons all passed through the atmosphere, each square meter of Earth's surface would intercept protons at the average rate of 1800 protons per second. What would be the electric current in amperes intercepted by a 51 x 107 km2 area on the planet?
Three sisters go skiing. Each has a mass of m = 50 kg. There are three different routes to the bottom. How fast is each sister going when she reaches the bottom
a sled is resting on packed snow. the coefficient of kinetic friction is now only 0.12. if a person weighing 650 N sits on the sled, what force is needed to pull the sled across the snow
question the current-density magnitude in a certain circular wire is j 2.60 times 1010 am4r2 where r is the radial
a good baseball pitcher can throw a baseball toward home plate at 83 mih with a spin of 1625 revmin. how many
A pilot claims to have seen a UFO moving initially at the speed of about 440 m/s in an easterly direction and then, in a tie interval of only 1.0s turning 45 degrees and moving souutheast at 440 m/s
A shopper walks from the door of the mall to her car 250m down the line of cars, and then turns 90 degrees to the right and walks an additional 60 meters. What is the magnitude of the displacement of her car from mall door.
Two rigid rods are oriented in parallel to each other and to the ground. Determine the current in the rods
a transverse traveling wave on a cord is represented bynbspdnbspnbsp0.56nbspsin6.4xnbspnbsp82t
A spacecraft with a proper length of 250 m passes by an observer on the Earth. According to this observer, it takes 0.780 µs for the spacecraft to pass a fixed point. Determine the speed of the spacecraft as measured by the Earth-based observer. c
A block of mass M = 0.8 kg hangs at the end of a massless spring. What is the new equilibrium extension of the spring
An electron of mass 9.1 * 10^-31 kg is moving in the xy-plane; its speed is 2.0 * 10^5 m/s, What are the components of the momentum of the electron
Then the driver sees a red light up ahead at next intersection, and starts slowing down at the constant rate. The car stops at the red light, 180 {rm m} from where it was at t = 0.
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