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The intensity due to a number of different sources is the sum of the individual intensities.
a. When all of the Octomom's octuplets cry simultaneously, how many decibels greater is the sound level than when one baby cries?
b. To increase the sound level by the same number of decibels, how many additional babies would be required?
A 12-V battery causes a current of 0.80A through a resistor, How many joules of energy does the battery lose in a minute
A 75kg skater starts his skate at 4m above ground, the horizontal distance to the bottom of the track is 6m. Calculate the speed of the skater at the bottom of the track
a block of mass m=0.2kg , in simple harmonic motion, has an amplitude of 3.5cm and a maximum speed of 70 cm/s. What is the angular frequency for the oscillation in rad/s?
The small piston of a hydraulic lift has a cross-sectional area of 3 cm2, and its large piston has a cross-sectional area of 200 cm2. What force should be applied to the small piston for the lift to raise a load of 15kN
The ?0 particle has a mass of 497.7 MeV/c2. It decays into a ?? and ?+, each having mass 139.6 MeV/c2. Determine the kinetic energy of the other pion after the decay
A laser beam is incident on two slits with a separation of 0.190 mm, and a screen is placed 5.30 m from the slits. what is the wavelength of the laser light
Draw a free body diagram for the block, carefully labeling all forces acting on the block. What is the mass density of the liquid? What will each scale read if block A is pulled up our of the liquid.
A Radio transmitter's RLC oscillator circuit initially stores all its energy in the capacitor then begins to oscillate. What average power (in watts) would a correctly tuned and phase-matched AC power supply need to generate in order to prevent this..
Two tiny conducting spheres are identical and carry charges of -21.4C and +51.0C. They are separated by a distance of 3.30 cm. (a) What is the magnitude of the force that each sphere experiences?
A small block with mass .2kg is released from rest at the top of a frictionless incline. how far down the incline does it travel in 2s
A small, 300g cart is moving at 1.90m/s on an air track when it collides with a larger, 5.00kg cart at rest. What is the speed of the large cart after the collision
An alpha particle (a helium nucleus, containing 2 protons and 2 neutrons) starts out with kinetic energy of 9.9 MeV (9.9x106 eV), What is the final kinetic energy of the gold nucleus
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