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In a classic model, the electron of a hydrogen atom circles the proton at a radius of 1.3225x 10-9 m when it is in the n=5 state. What is its electric potential energy?
q1. a uniform plank of length 4.6 m and weight 204 n rests parallel on two supports with 1.1 m of the plank hanging
A police radar has an effective range of 1.3 km, while a motorist's radar detector has a rangeof 1.8 km. The motorist is going160 km/h in a 60km/h zone when the radar detector beeps. At what rate must the motorist decelerate to avoid a speeding ticke..
three particles of charge q are at the corners of an equilateral triangle of side length a.a at what point if any in
A block is hung by a string from the inside roof of a car. Then the string makes an angle with the vertical. Find what the angle
A 20 gram sample of refuse derived fuel has a heat capacity of 13,000 cal/°C and a heat value of 2800 cal/g. What temperature rise is expected when the sample is combusted in a calorimeter
Old naval ships fired 13 kg cannon balls from a 210 kg cannon. It was very important to stop the recoil of the cannon, since otherwise the heavy cannon would go careening across the deck of the ship.
Can this acreage produce the combination 4000 bushels of corn and 500 pounds of beef? What does this combination suggest about the use of this acreage? (Use your graph to answer this question.)
A light bulb is connected to a 240 Vwall socket. The current in the bulb depends on the time taccording to the relation I = (2.121 A) sin[ (439.6Hz) t ]. What is the frequency of the alternating current
A 30-meter steel tape is correct at a temperature of 20.0(C). The distance between two points, What is the true distance between the points
Suppose that you measure the resistance of a resistor using a voltmeter, a current meter, and a battery. Suppose that the voltmeter reads 0.2 % high and the current meter reads 0.3 % low. What will be the percent error in your measurement of resis..
An observer at r = r1 in Schwarzchild geometry sends a light signal in the radial direction toward r = r2 where r2 > r1. Determine the instantaneous coordinate velocity dr/dt of the signal.
a golf ball rolls of a cliff with an inital speed of 13.0 m/s. theball falls a vertical distance of 18.8 m into a lake below. Ittakes 1.45 s. What is the speed of the ball just before it hits the water
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