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Q1. The frequency of an opera singer is 450 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observer who is running down the road towards the opera singer with a speed 25.0 m/s?
Q2. Three uniform thin rods, each of length L = 22 cm, form an inverted U. The vertical rods each have mass of 14 g; the horizontal rod has mass of 48 g. Where is the center of mass of the assembly (x, y)?
An electron moves in the positive x-direction a distance of 2.38 m in 2.95 x10-8 s, bounces off a moving proton, and then moves in the opposite direction a distance of 1.63m in 3.53x 10-8 s.
Using the electric field described in the alpha-cannon simulation, suppose that an alpha particle is fired upward and forward from a height y = 0 m at a speed v = 28.0 m/s.
A charged sphere of radius 10 cm has a total charge of 5 C. Calculate the potential at the surface of the sphere
A spaceship of proper length 308 m takes 0.76 µs to pass an Earth observer. Determine the speed of this spaceship as measured
3.00×104 of 300 C steam at a pressure of 20.0 is cooled until it condenses. What is the volume of the liquid water
cancer patient is undergoing radiation therapy in which protons with an energy of 1.2 MeV are incident on a 0.10-kg tumor. How many protons are absorbed by the tumor
A screen is placed 1.20m behind a single slit. The central maximum in the resulting diffraction pattern on the screen is 1.40cm wide-that is, find the distance between the two second-order minima
As a small aircraft approaches a landing strip, it is flying along horizontally at constant (low) altitude, What is the weight of the plane? Air density = 1.29 kg m-3
Suppose that the air bubble is always in thermal equilibrium with the surrounding water.
A 60 gram iron at 60o C is dropped into 200 gram of water at 20o C, What is the final equalibrium temperature of the system
A weather balloon contains 12.0 m3 of hydrogen gas when the balloon is released from a location at which the temperature is 22.0°C, what is the new volume of the balloon
When the incoming proton was at a distance of more than 1.4 x 10-15 m from the nucleus, there was a force of repulsion between this proton and the nucleus.
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