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How was the zodiac used as a primitive calendar? Which century year will next be a leap year? What effect does the precession of the Earth's axis have with respect to the pole star, or North Star?
A baseball is being caught; its speed goes from 90 to 0km/hr in about 0.005 kilogram. Calculate what is the size of the force acting on it
A rotating fan completes 1200 revolutions every minute. Consider a point on the tip of a blade, at a radius of .20 m.
A flat sheet of ice (n = 1.309) has a thickness of 1.6cm. It is on top of a flat sheet of crystalline quartz (n = 1.544) that has a thickness of 0.86cm. Light strikes the ice perpendicularly and travels through it and then through the quartz. In t..
If a pendulum is oscillating at an angle Φo=60 degree, compute by what percent the period deviates from its small angle limit
A 302 kg car moving at 15.7 m/s hits from behind another car moving at 10.6 m/s in the same direction. what is the velocity of the first car after the collision
A uniform meter stick is freely pivoted about the 0.20-m mark. If it is allowed to swing in a vertical plane with a small amplitude and friction, what is the frequency of its oscillations
A bullet with mass 5.04 g is fired horizontally into a 2.125-kg block attached to a horizontal spring. Find the initial speed of the bullet-block system
An alpha particle is moving at a speed of 5x105 m/s in a direction perpendicular to a uniform magnetic field of strength 9x10-2 T. The charge on an alpha particle is 3.8x10-19 C and its mass is 5.9x10-27 kg.
The concepts for finding the change in length of a rod.
How much work is done by a 86.5 kg man running up a flight of stairs 20.0m long in 4.25 seconds, how much power does the man exert while running
You drive the 4400km from coast to coast of the United States at 65 mi/h (105 km/h) stopping an average of 25min for rest and refueling after every 3.0h of driving, What is your average velocity for the entire trip
A 64kg human sprinter can accelerate from rest to 10 m/s in 3.0s . During the same time interval, a 28kg greyhound can go from rest to 20 m/s. What is the average power output of the human
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