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At a distance of 65 centimeter, a mosquito can barely be heard at a sound level of 4.9 dB.
A. Evaluate what is the intensity of this sound?
B. If the same mosquito were flying at a distance of 2.1 centimeter from your ear, find what would be the intensity of its sound?
C. Determine how loud would the mosquito sound at 2.1 cm from your ear (dB)?
An amusement park ride called the Rotor consists of a room in theshape of a vertical cylinder (1.98 m inradius) which, once the riders are inside, begins to rotate,forcing them to the wall.
An airplane wing is designed so that the speed of the air across the top of the wing is 220 m/s when thespeed of the air below the wing is 205m/s. The density of the air is 1.29 kg/m3. What is the lifting force on a wing of area 30.0m2?
A proton with an initial velocity of (1.0x + 2.0y + 3.0z) x 10^5 m/s enters a megnetic field of 0.50z T. Find the magnitude of the force on the proton. The mass of the proton is 1.67 x 10^-27 kg.
A sphere with radius 2 cm is placed at a location near a point charge. The sphere has a charge of -9*10^(-10) C spread uniformly over its surface.The electric field due to the point charge has a magnitude of 470 N/C at the center of the sphere. Wh..
On April 13, 2029 (Friday the 13th!), the asteroid 99942 mi Apophis will pass within 18600 mi of the earth-about 1/13 the distance to the moon! It has a density of 2600 kg/m^3, how much kinetic energy would it deliver
A uniform board is leaning against a smooth vertical wall. The board is at an angle above the horizontal ground. The coefficient of static friction between the ground and the lower end of the board is 0.666. Find the smallest value for the angle ?, s..
An Olympic skier moving at 20m/s down a 30o slope encounters a region of wet snow and slides 145 m before coming to a stop. What is the coefficient of friction between skis and snow if the combined mass of the skier and skis is 55 Kgm.
A 2.00 kg disc has a 500.mm diameter. It is rotating at 200. rpm about its central longitudinal axis (like the bicycle wheel we saw in class)
Unpolarized light passes through 5 parallel ideal polarizing filters. What is the ratio of the initial intensity to the final intensity of the light
a segment of wire carries a current of 25 a along the x axis from x -2.0 m to x 0 and then along the z axis from z0 to
An industrial laser is used to burn a hole through a piece of metal. The average intensity of the light is = 1.72 × 109 W/m2. What is the rms value of (a) the electric field and (b) the magnetic field in the electromagnetic wave emitted by the laser.
A 1.8 m long solenoid is 15 cm in diameterand consists of 2010 turns of wire. The current in the solenoid is increasing at the rate of 1.0 kA/s.
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