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On a workday, the average decibel level of a busy street is79dB with 100 cars passing a given point every minute. If thenumber of cars is reduced to 20 every minute on a weekend, what is the decibel level of the street?
A wheel 55-cm in diameter accelerates uniformly from 240 rpm to 395 rpm in 5.0 s. How far will a point on the edge of the wheel have travelled in this time.
A beam of light is sent directly down onto a glass plate (n = 1.5) and a plastic plate (n = 1.2) that form a thin wedge of air (see the drawing). An observer looking down through the glass plate sees the fringe pattern shown in the lower part of the ..
The polarizing angle for light in air incident on a glass plate is 57.2. What is the index of refraction of the glass
Using a grating with a spacing of 0.00046 cm, a line (which looks like red light) appears 27 cm from the central line on a screen. The screen is 1.9 m from the grating. What is the wavelength of the light?
A cubic box of volume3.6multiplied by10-2m3is filled with air at atmospheric pressure at 20°C. What is the net force on each side of the box
The function = -38 cos(20t) (with in degrees) describes the oscillation ofa certain torsion pendulum (Figure 13-4). Assume the counterclockwise direction to be positive. Find the maximum angle to which the torsionpendulum swings;
The horizontal and vertical components of the initial velocity of a football are 20m/s and 30m/s respectively. To what maximum height doe the football rise
A jet airplane is in level flight. The mass of the airplane is m = 8830 kg. find the magnitude of the lift force acting on the plane
A father racing his son has 1/2 the kinetic energy of the son, who has 1/3 the mass of the father, What are the original speeds of (b) the son
You have a small electromagnet that consumes 300 W from a residential circuit delivering 120 V at 60.0 Hz. find the internal resistance of the electromagnet
A spherical balloon is made from a material whose mass is 2.57 kg. The thickness of the material is negligible compared to the 1.22-m radius of the balloon. Find the absolute pressure of the helium gas
A small plastic ball of mass m = 1.50 g is suspended by a string of length L = 24.5 cm in a uniform electric field, what is the net charge on the ball
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