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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 certain piece of metal weighs 1.68 N in air and 0.82 N when submerged in water. What is the mass density of the metal (in g/cm3)
Differentiate this equation, q=qpcosωt to find the current in the LC circuit, and use q=CV to find the voltage. From these obtain the magnetic energy in the inductor and the electric energy in the capacitor, and sum to show that the total energy rema..
An Australian emu is running due north in a straight line at a speed of 13.0 m/s and slows down to a speed of 10.2 m/s in 3.80 s. find the magnitude and direction of the bird's acceleration
Two capacitors, one 17.5 ?F and the other 12.2 ?F are connected in series across a 15 V battery. What is the charge stored on the 12.2 ?F capacitor
A woman on a 10 speed bicycle travels at 9 m/s relative to ground as a she passes a little boy on a tricycle going in the opposite direction. If the boy is travelling at 1m/s relative to the ground, how fast does the boy appear to be moving relati..
A 5.00 g object moving to the right at 20 cm/s makes an elastic head on collision with a 10.0 g object that is initially at rest. Find (a) velocity of each object after the collision and (b) the fraction of the initial kinetic energy transferred to t..
(a) Determine the distance of the final image relative to the converging lens. (b) What is the height of the final image (including the proper algebraic sign)?
When you press one of the buttons on a small calculator, a 3.5 v battery provides a small constant current of 60μA for 300 ms. Calculate the electrical potential energy U produced by the battery
A flat coil of wire has an area A, N turns, and a resistance R. It is situated in a magnetic field, such that the normal to the coil is parallel to the magnetic field. The coil is then rotated through an angle of 90?, so that the normal becomes pe..
How is sound produced and how are standing waves set up in the instruments? Key words: incident, reflected, interference, wavelength, string/pipe length
A bug sits on the rim of a 30 cm-diameter disk. The disk accelerates uniformly from rest to an angular speed of 75.0 rev/min in 4.30 s?, What is the tangential acceleration of the bug
What is the average kinetic energy of helium atoms in a region of the solar corona where the temperature is 5.10 ? 105 K
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