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A person wears a hearing aid that uniformly increases the sound level of all audible frequencies of sound by 27.6 dB. The hearing aid picks up sound having a frequency of 250 Hz at an intensity of 3.30 10-11 W/m2. What is the intensity delivered to the eardrum?
a proton has a speed 4.5*10^5 m/s at a point where electrical potential is 900V. it moves through a point where the electric potential is 500V. find the kenetic energy of proton at first point
What is the pressure change in water going from a 3.2- cm-diameter pipe to a 1.8- cm-diameter pipe if the velocity in the smaller pipe is 8.0 m/s
A 1200 kg frictionless roller coaster starts from rest at a height of 22 m. What is its kinetic energy when it goes over a hill that is 13 m high
A 73.1-kN car is traveling at 70.9 mph when the driver decides to exit the freeway by going up a ramp. What is the magnitude of the average drag force exerted on the car
question1suppose you clarify two thin slits by monochromatic coherent light in air and find out that they create their
A 60.0 kg crate is slid up an inclined ramp 2m long onto a platform 1.6 m above the floor level. A 452 N force, parallel to the ramp, is needed to slide the crate up the ramp at a constant speed. How much work is done in sliding the crate up the r..
The nucleus of the hydrogen atom has a radius of about 1.1 Ã- 10-15 m. find the volume of the nucleus
A certain red giant star has a luminosity of 100,000 times that of the Sun and is located 600 light-years from Earth. calculate the rate of interstellar extinction in the direction of the star
A satellite of mass 200 kg is orbiting around the Earth with constant speed, in a circular orbit. The centripetal acceleration is am = 0:6 m/s2 . We need to make a correction to its orbit so we fi re its boosts. The fi rst boost creates an instant fo..
The Acapulco cliff diving competition, which was made famous in the 1970's on ABC's Wide World of Sports, involves a vertical drop of 37 m to the water below. How long will it take him to hit the water
Light of wavelength 800nm is incident on a metallic surface. if the stopping potential for the photo-electrons ejected from the metal is 0.35 volts, find the work function for the metal and the longest wavelength incident light that will eject photo-..
A high intensity desk lamp is rated at 45W but requires only 12V. It contains a transformer that converts 120V household voltage. What is the current in the secondary coil
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