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A fire engine moving to the right at 40 m/s sound its horn (frequency = 500 Hz) at the two vehicles shown in the figure. The car is moving to the right at 30 m/s, while the van is at rest. (a) What frequency is heard by the passenger in the car? (b) What is the frequency as heard by the passengers in the van? (c) When the fire engine is 200 m from the car and 250 m from the van, the passengers in the car hear the sound intensity level of 90 dB. At that moment, what intensity level is heard by the passenger in the van?
If an object of 50 grams of unknown material at 100 degrees C is mixed with 100 grams of water at 0 degrees C, the final temperature is 40 degrees C
You have just landed on a planet. You take out a block of mass 245g , release it from rest from a height of 14.01m, What is the acceleration of gravity on this planet
A perfect cube with sides of 9.0cm is placed so that one corner is at the origin and its faces are parallel to the coordinate planes, find the total charge located within the cube
Two speakers emit sound waves with frequency of 418 Hz. They are driven by the same oscillator so that they are in phase with each other. How far apart are the antinodes in that standing wave
Point charges of +1nc, +3nc and -3nc are located at each of three corners of an equilateral triangle with side length of 30cm. Find the net electrostatic fornce exerted on the +1nc charge.
A grindstone of radius 4 m is initially spinning with an angular speed of 8 rad/s. The angular speed is then increased to 10 rad/s over the next 4 seconds. Imagine that the angular acceleration is constant.
An auto goes from 0 to 30 m/s in 5 s, at a uniform rate of acceleration. The radius of the auto's tires is .33 m. How many revolutions per second are the tires making
A 1200kg automobile travels at 90km/h. What is its kinetic energy? What net work would be required to bring it to a stop
A body of mass 200 g is acted upon by a force of 20 n. Find the acceleration of the body. If the body above is having a volume of 1000 cm3 estimate its density in kg/m2.
Three particles, each with a mass of 0.25 kg, are located at ( -4.0 m, 0), (2.0 m, 0), and (0, 3.0 m) and are acted on by forcesF1 = (-3.0 N)y, F2 = (5.0 N)y andF3 = (4.0 N)x, and respectively. Find the acceleration(magnitude and direction) of the..
An x ray with a wavelength of 0.100 collides with an electron that is initially at rest. What is the final kinetic energy of the electron
q1. points a and b have electric potentials of 293 v and 149 v respectively. when an electron released from rest at
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