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A vehicle is clocked for 2.5 seconds, and it is found that it accelerates at -3.89 m/s squared. Its also found that the vehicle was moving at 15.0 m/s [S] at the end of the timing. How fast was the vehicle moving when the timer began? (How can I do this with acceleration equals velocity over time formula OR acceleration equals final velocity minus initial velocity over time?)
The angle of incidence of a light beam in air onto a reflecting surface is continuously variable. What is the index of refraction of the reflecting material
A typical sound level for a buzzing mosquito is35dB, and that of a vacuum cleaner is approximately 69dB. Approximately how many buzzing mosquitoes will produce a sound intensity equal to that of a vacuum cleaner?
A model rocket rises with constant acceleration to the height of 3.7, at which point its speed is 25. what was the magnitude of the rocket's acceleration.
A stamp collector is viewing a stamp with a magnifying glassheld next to her eye. Her near point is 25 cm from her eye. What is the refractive power of a magnifyingglass that has an angular magnification of 6.9 when the image ofthe stamp is located ..
A box that is 4.1m x 2.6m x 5m is filled with 915 balloons. Each balloon is filled with 0.00026808257310633 cm3 of helium. What is the mean free path of a balloon
Explain what is meant by resonance, or driving the system at resonance. Give an example of a system that has only one natural frequency and a system that has an infinite number of natural frequencies.
A pressure of 10 Pa is applied through a piston uniformly on the surface of water in a cylinder. How much of this pressure if it is 80 cm deep?
a fence post is 46.0m from where you are standing in a direction 39.0 degree north of east. a second fence post is due
You are a secret agent and find that you have been pushed out of an airplane without a parachute. Fortunately, you are wearing a large overcoat, what is your new terminal velocity with the coat
The number of radioactive nuclei in a particular sample reduces over a period of 10 d to one-sixteenth the original number. What is the half-life of these nuclei?
A roller coaster at an amusement part starts out an a level track 50.0 m long and then goes up a 25.0 m incline at an angle of 30 degrees to the horizontal. what is its displacement from the starting point
A sphere of radius R is made of insulating material, and has a total charge Q, but the charge density inside varies as p(r) = Q/(4piRr2). What is the magnitude of the electric field at any point r
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