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During World War II, tritium (3H) was a component of fluorescent watch dials and hands. Assume you have such a watch that was made in January 1944. If 17% or more of the original tritium was needed to read the dial in dark places, until what year could you read the time at night? (For 3H, half life= 12.3 yr.)
A school bus takes 0.89 h to reach the school from your house. If an average velocity of the bus is 21.1 km/h to the east, what is the displacement.
A uniform disk with a mass of 885 g and radius 17.0 cm is rotating on frictionless bearings with an rotational speed of 18.0 Hz when Jill drops a 145-g clod of clay on a point 8.40 cm from the center of the disk, where it sticks. What is the new rota..
A ring shaped space station with a radius of 1 km is spinning, sothat the speed of the rim is 50 m/s. What is his apparent weight
If the magnitude of the drift velocity of free electrons in a copper wire is 7.12 10-4 m/s, what is the electric field in the conductor
Small research nuclear reactors, like those mostly used in universities, are often submerged in concrete structures that look like swimming pools. The water serves as a moderator of the neutrons. They often have a blue glow in the swimming pool a..
The turns ratio N1/N2 is 2.60, and the rms source voltage is delta Vs = 88.0 V. If a voltmeter across the load resistance measures an rms voltage of 24.0 V, what is the source resistance RS?
What is the wavelength of sound if it has a wavespeed of 1.36 m/s and a frequency that is 6.69 Hz? (The unit of measure for the wavelength is a meter, which is written m.)
Old naval ships fired 14 cannon balls from a 240 cannon. It was very important to stop the recoil of the cannon, since otherwise heavy cannon would go careening across the deck of the ship.
While snorkeling you hear a dolphin's sound as it approaches at 5.00 m/s. what is the actual frequency being emitted
A galvanometer has an internal resistance of 100 ? and deflects full-scale at a current of 2.00 mA. how should this resistor be connected to the galvanometer
A object with mass m=1.0kg is rotating around a axis, with a constant angular speed omega=6.28rad/s. The radius of the circular motion is 2.0m. What is the tangential speed
A positive point charge q = +2.36 nC is located at x = 1.20 m and a negative charge of -2q = -4.72 nC is located at the origin as in the following figure. Sketch the electric potential versus x for points along the x-axis in the range -1.50 m
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