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A dolphin located in sea water at a temperature of 25°C emits a sound directed toward the bottom of the ocean 100 meter below. Find how much time passes before it hears an echo?
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When she tightens the string slightly, she hears 6 beats/s. What is the frequency of string now.
In the Bohr model of the hydrogen atom, an electron moves in a circular path around a proton. The speed of the electron is approximately 2.51 106 m/s. Find the centripetal acceleration of the electron
a projectile is fired with an initial speed of 64.8m/s at an angle of 44.3 degrees above th horizontal on a long flat firing range. determine the direction of the projectile
what is the net workdone on the weights.A child slides down a hill on a toboggan with an acceleration of 1.8 m/s2. If she starts at rest, how far has she traveled after following lengths of time.
A ray of light is incident on the surface of a block of clear ice at an angle of 44.0° with the normal. Find the angle between the reflected and refracted light
Find the frequency in terahertz of visible light with a wavelength of 485 nm in vacuum. What is the wavelength in centimeters of electromagnetic microwave radiation whose frequency is 7.61 GHz?
An object is launched vertically from near the surface of the Earth at at velocity of 100.0 m/s, What is its acceleration at its maximum height
A grating has 1000 lines/mm. How wide must the grating be to resolve the mode structure of a 632.8 nm laser if the frequency difference between the modes is 450 MHz?
A starship lands on a planet of mass 6*10^23 kg. An astronaut throws a rock of mass 9.5 kg up from the ground at 17 m/s. what is the gravitational acceleration on the rock
A 800kg car pushes a 1800kg truck that has a dead battery. When the driver steps on the accelerator, What is the magnitude of the force of the car on the truck
If 3.00 multiplied by 10-3 kg of gold is deposited on the negative electrode of an electrolytic cell in a period of2.75 h, what is the current in the cellduring that period? Assume the gold ions carry one elementary unitof positive charge.
A sewing machine needle moves with a rapid vibratory motion, rather like SHM, as it sews a seam. What is the maximum needle speed
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