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A person wears a hearing aid that uniformly increases the intensity level of all audible frequencies of sound by 34.2 dB. The hearing aid picks up sound having a frequency of 250 Hz at an intensity of 3.60 10-11 W/m2. What is the intensity delivered to the eardrum?
A 1300 kg truck drives around a flat 230 m -diameter circular race course at 27 m/s. What is the magnitude of the net force on the car
Suppose the flux through a loop changes uniformly from 12 Wb to 18 Wb in 6.50 s. What is the magnitude of the emf induced in the loop
A Spring of negligible mass has force constant K= 1700 N/m. How far must the spring be compressed
A coil of wire that is 3.0cm in diameter has 1500 turns is in a magnetic field that goes from0 T to 0.5 T in 5 ms. The axis of the coil is parallel to thefield. What is the emf of the coil?
What should the charge (sign and magnitude) of a particle of mass 1.44 be for it to remain stationary when placed in a downward-directed electric field of magnitude 630 ? Use 9.81 for the magnitude of the acceleration due to gravity.
The drawing shows two boxes resting on frictionless ramps. Onebox is relatively light and sits on a steep ramp. The other box isheavier and rests on a ramp that is less steep. The boxes arereleased from rest at A and allowed to slide down the ramp..
An air puck of mass m1 = 0.21 kg is tied to a string and allowed to revolve in a circle of radius R = 0.8 m on a frictionless horizontal table. What is the horizontal force acting on the puck
What is the angular separation of two spectral lines of wavelengths 446 nm and 398 nm formed in order m=2 with a 360 line/mm grating
How many joules of kinetic energy does a 750-{rm kg} automobile travelling at the typical highway speed of 65 {rm{ mi/h}} have.
An asteroid (m = 4 x 1010 kg) falls to Earth from very far away. Assume the original (very far away) velocity of the asteroid to be negligible. How fast is the asteroid when it crosses Mars' orbit
question a jetliner has a mass of 1.1 x 105 kg and flies at a speed of 120 ms. a find the value of its momentum. b if
A long cylindrical conductor of radius R = 3cm carries a uniformly distributed current, I, through its cross section, perpendicular to the plane of the paper. The magnetic field, B, at a distance r = 8 cm from the axis is 35 uT in a clockwise sens..
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