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A firetruck is approaching at a speed of 25 m/s and an observer at rest hears a frequency of 780 Hz. What is the frequency that the firemen in the truck hear? (looks like '783 Hz')
You have invented a new game and are playing it with your friends. You have a projectile launcher that fires a brick (mass=2 kg) with a speed and angle that you can adjust. What is the work done by friction during the block's motion
Ball 1, with a mass of 150 g and traveling at 11 m/s, collides head on with ball 2, which has a mass of 300 g and is initially at rest. What are the final velocities of each ball if the collision is perfectly elastic
A dockworker applies a constant horizontal force of 89 Newton to a block of ice on a smooth horizontal floor. If the worker stops pushing after 4.60 second, determine how far does the block move in the next 5.70 second
Choose the origin to be at the location where the bullet begins to move. Then the force (in newtons) exerted by the expanding gas on the bullet is 14100 + 9700x - 25750x2, where x is in meters.
The plot shows a force vector, F, inclinedat an angle with respect to the x-axis. What is the x component of the vector F. What is the y component of the vectorF? What is the angle α?
Water runs into a fountain, filling all the pipes, at a steady rate of 0.785 m/s3. At what speed will it shoot out if the diameter of the hole is two times as large
Calculate the value of the output voltage, Vout, in the circuit in Figure 8-1 below. Take care this circuit has a dependent source in it.
A satellite has a mass of 7930 kg and is in a circular orbit9.88x106 m above the surface of a planet. The periodof the orbit is 16.1 hours. The radius of the planet is 3.16x106 m. What is the true weight of the satellite when itis at rest on the plan..
a radiator has an emassivity of .90 and its exposed area is 1.23 m^2. What is the heat flow rate from the radiator
A helicopter has 3 blades, each of them are 5.20m long and has a mass of 220kg.(each blade has a mass of 220kg, not the sum of the 3) The rotor is rotating at 385 rev/min. What is the rotational inertia of the rotor assembly about the axis of rot..
Two divers jump from a 5-m platform. One jumps upward at 1.90m/s , and the second steps off the platform as the first passes it on the way down. By how much does the first diver hit the water first (seconds)
The radioactive isotope TI-204 decays to Pb-204 by emitting an electron. The electron may have a kinetic energy of up to 0.763 MeV. Find the momentum of the electron
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