Physics, 05.05.2020 04:15 dillonmichaeld8069
One day when the speed of sound in air is 343 m/s, a fire truck traveling at vs = 34 m/s has a siren which produces a frequency of fs = 449 Hz. Randomized Variables vS = 34 m/s f = 449 Hz show answer No Attempt 50% Part (a) What frequency (in Hertz) does the driver of the truck hear? fd = | sin() cos() tan() cotan() asin() acos() atan() acotan() sinh() cosh() tanh() cotanh() Degrees Radians Ο ( ) 7 8 9 HOME E β^ ^β 4 5 6 β / * 1 2 3 β + - 0 . END β() BACKSPACE DEL CLEAR Grade Summary Deductions 0% Potential 100% Submissions Attempts remaining: 3 (4% per attempt) detailed view Hints: 4% deduction per hint. Hints remaining: 1 Feedback: 5% deduction per feedback. No Attempt No Attempt 50% Part (b) What frequency (in Hertz) does an observer hear when the truck is moving away?
Answers: 3
Physics, 22.06.2019 13:00
At a certain instant after jumping from the airplane a, a skydiver b is in the position shown and has reached a terminal (constant) speed vb = 52 m/s. the airplane has the same constant speed va = 52 m/s, and after a period of level flight is just beginning to follow the circular path shown of radius Οa = 2330 m. (a) determine the velocity and acceleration of the airplane relative to the skydiver. (b) determine the time rate of change of the speed vr of the airplane and the radius of curvature Οr of its path, both as observed by the nonrotating skydiver.
Answers: 3
Physics, 22.06.2019 17:40
Emmy kicks a soccer ball up at an angle of 45Β° over a level field. she watches the ball's trajectory and notices that it lands, two seconds after being kicked, about 20 m away to the north. assume that air resistance is negligible, and plot the horizontal and vertical components of the ball's velocity as a function of time. consider only the time that the ball is in the air, after being kicked but before landing. take "north" and "up" as the positive β and βdirections, respectively, and use β10 m/s2 for the downward acceleration due to gravity.
Answers: 2
Physics, 22.06.2019 19:30
A47.2 g block of copper whose temperature is 480 k is placed in an insulating box with a 91.8 g block of lead whose temperature is 200 k. (a) what is the equilibrium temperature of the two-block system? (b) what is the change in the internal energy of the two-block system between the initial state and the equilibrium state? (c) what is the change in the entropy of the two-block system? the heat capacities of copper and lead are 386 j/kgΒ·k and 128 j/kgΒ·k, respectively.
Answers: 1
One day when the speed of sound in air is 343 m/s, a fire truck traveling at vs = 34 m/s has a siren...
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