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A point source emits sound waves with a power output of 120 W. At what distance will the decibel reading be 140 dB, which is noise level of a loud indoor rock concert?
An object is placed to the left of the converging lens, and the final image produced by the two-lens combination lies 21.2 cm to the left of the diverging lens. How far is the object from the converging lens
Two blocks (A and B) are in contact on a horizontal frictionless surface. A 40N constant horizontal force is applied to A. The mass of A is 5.0kg and the mass of B is 20k
A beam of ultraviolet radiation, with frequency of 2.710×1015 Hz is directed on a clean metal surface. Calculate the maximum kinetic energy for an electron dislodged from the surface by the radiation
An arrow is shot at an angle of θ=45° above the horizontal.
A rifle with a barrel length of 59cm fires a 10g bullet with a horizontal speed of 440m/s. How long does it take the bullet to come to rest after entering the wood
A 3 liter aluminium cylinder at 5°C is filled to the brim with gasoline at the same temperature. If the aluminium and gasoline are warmed to 62°C, how much gasoline spills out.
A blacksmith heats a 1.9 kg iron horseshoe to 480 degree C, then plunges it into a bucket containing 10kg of water at 20 degree C. The specific heat of iron is 447 J/kgK. What is the final temperature.
A parallel plate capacitor has square plates with sides of length 10 cm. The distance between the plates is 4 mm. What is the amount of charge on each plate
An electron is initially at rest just outside a large copper surface that has a charge density of 1.04 10-6 C/m2. How far has the electron moved in 1.12 10-9 s if the field is uniform over this region
Asteroid 433 Eros is one of the largest near-Earth asteroids. For purposes of this problem,assume it is spherical. What is the mass of Eros
A square loop is rotating around it's vertical axis in a magnetic field of strength B = 0.06 T as shown in View , calculate the current flowing in the loop
This question has to do with the oil drop experiment and how much voltage must be applied to keep a drop suspended in air. how much voltage must be used to keep the oil drop suspended
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