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The sound level from a siren emitting sound with a frequency of 2300 Hz is 70.0 dB at a distance of 40.0 m from the siren. Assume that the intensity of that sound obeys the inverse square law. Calculate how far from the siren a person, with a threshold of hearing of 25.0 dB at that frequency, can be located to barely be able to hear the sound from that siren.
David is driving a steady 21.0 when he passes Tina, who is sitting in her car at rest. What is her speed as she passes him
Atoms of lithium are able to absorb photons of frequency 2.01 x 1014 Hz. This corresponds to a transition state from the ground state (at -5.37 ev) to an excited state. Zero energy corresponds to the state in which one electron is completely rem..
a 10-m-by-14-m house is built on a 12-cm-thick slab of concrete. what is the rate of heat loss through the slab if the
An unstable elementary particle comes in two varieties, one with positive and one with negative electric charge, What is the difference (R+)-(R-) between the two rates, with its error
a car is traveling with an initial velocity of 14 ms accelerates at a constant rate of 3 ms2 for 5 seconds. what is its
A square with sides of length L has a point charge at each of its four corners. Find the magnitude and sign of the charges Q such that each of the +1.00 µC charges experiences zero net force
A 0.20 kilogram hockey puck is sliding on a frictionless ice surface with a velocity of 14 m/s toward the east just before making contact with a hockey stick. Determine what change in momentum
1. calculate the dc voltage applied to the 10 ? load resistor in the circuit shown below assume the diode threshold
In a house the temperature at the surface of a window is 23°C. The temperature outside at the window surface is 6°C. Heat is lost during the window via conduction, and the heat lost per second has a certain value.
a 10.0-kg uniform ladder that is 2.50 m long is placed against a smooth vertical wall and reaches to a height of 2.10 m
Starting from rest, a car travels 1 350 meters in 1.00 minute. It accelerated at 1.0 m/s2 until it reached its cruising speed. What was its cruising speed
A car with a mass of 1000 kg is driving over a hill at a constant speed of 60 m/s. What is the weight (in N) of the car at the top of the hill
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