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Q. An opera singer in a convertible sings a note at 419 Hz while cruising down the highway at 81.0 km/hr. What is the frequency (in Hz) heard by a person standing beside the road in front of the car? Assume that the speed of sound is 343 m/s
Q. Two masses, m1 and m2, are lying on a plane without friction and are connected by a striong. A force F is applied to the mass m1 so that the whole system accelerates along a straight line. What is the tension of the string T between the masses m1 and m2? What is the acceleration of the system?
A trough is 5 feet long and 1 foot high. The vertical cross-section of the trough parallel to an end is shaped like the graph of y=x10 from x=1 to x=1. The trough is full of water. Find out the amount of work in foot-pounds required to empty the t..
At a construction site, a 63.0 bucket of concrete hangs from a light (but strong) cable that passes over a light friction-free pulley and is connected to an 83.0 box on the horizontal roof. The cable pulls horizontally on the box, and a 45.0 bag of g..
A 15.0 m uniform ladder weighing 500 N rests against a frictionless wall. The ladder makes a 60.0 angle with the horizontal. Find out the horizontal and vertical forces the ground exerts on the base of the ladder when an 800 N fire-fighter is 4.00m f..
Find the energy, in joules, of one quantum of energy for an atomic oscillator in a block of aluminium.
What is the instantaneous power, at a time of 0.00700 seconds, dissipated by a 200 ohm resistor in a resonant AC circuit powered by a generator with a 21.0 V highest potential difference operating at 5000 rad/s .
How much horizontal force should a sprinter of mass 57.0 exert on the starting blocks to produce this acceleration.
What is magnitude of the net force on the student
The ball is 21.9 m from the goal post. The ball is kicked with an initial velocity of 19.8 m/s at an angle θ above ground. Between what two angles, θ1 and θ2, will the ball clear the 2.74m high crossbar.
A female gymnast weighs 620 N. If she is hanging stationary from a high bar, how many forces are acting on her.
A 21g particle is moving to the left at 29 m/s. How much work must be done on the particle to cause it to move to the right at 41 m/s.
Two joggers run at a constant velocity of 7.5 m/s toward the east. At time t=0, one is 15m east of the origin and te other is 15m west.
What is the speed of each ball as it strikes the ground? How far apart are the balls 0.700 s after they are thrown.
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