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a) A sound wave with an intensity level of 80.1 dB is incident on aneardrum of area 0.600*10-4 m2. Calculate theenergy is absorbed by the eardrum in 4.00 minutesin μJ.b) The sound level 25.0m from a loudspeaker is 69.0 dB. Calculate the rate at which soundenergy is produced by the loudspeaker, assuming it to be anisotropic source. Answer in W.
The radius of the moon is about 0.273 times the earth radius, its mass is about 0.0123 times the mass of the earth. Calculate your weight on the moon
A cannonball is fired out of a cannon at [50] m/s at [45] degrees above horizontal, on level ground. How far will the cannonball travel horizontally
We have some air in a cylinder like that in the figure. Assume that air is an ideal diatomic gas. The diameter of the cylinder is 5.4 cm. Find the amount of hear that was put into air
Two flat 4.0 cm × 4.0 cm electrodes carrying equal but opposite charges are spaced 2.0 mm apart with their midpoints opposite each other. What is the magnitude of the charge on each electrode
A proton is initially at rest at a point where the potential is 459 V. Sometime later the proton is at a point where the potential is 218 V. If no force other than an electrostatic force acts on the proton, what is its final kinetic energy.
In a certain electron beam, there are 4.5 x 106 electrons per cubic centimetre. The kinetic energy of the electrons is 12.0 keV, Find the beam current
A ball is thrown at an angle of 30.9 degrees above the horizontal at a speed pf 8.77 m/s. What is the vertical component of the ball's velocity
A person with a near-point distance of 29 cm is able to get a usable magnification of 12 with a particular magnifying glass. What is the friend's near-point distance
A bat flying at 5.25 m/s is chasing an insect in the same direction. The bat emits a 39.90-kHz chirp and receives back an echo at 40.50 kHz. What is the speed of the insect
What is an acceleration of two falling sky divers (mass 120.0 kg including parachute) while the upward force of air resistance is equal to one-fourth of their weight.
But rather caused by a star collapsing upon itself causing not a huge bang as once thought, other than rather a wimper, later emitting Hawking Radiation.
A parachutist descending at the speed of 25 m/s loses a shoe at an altitude of 50 m. (Assume the positive direction is upward.)
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