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A car moving at 25m/s approaches a stationary whistle that emits a 350Hz sound. The speed of sound in the air is 343m/s
A) what is the frequency of sound heard by the driver of the car?
B) what is the frequency of sound heard by the driver of the car after passing the whistle and moving away from it?
C) what is the frequency of sound heard by the driver of the car if the whistle is also moving toward the car at 12m/s?
D) what is the frequency of sound heard by the driver of the car if the whistle is now moving in the same direction as the car with a speed of 12m/s?
a block having mass m= 10kg rests on a horizontal surface. Us+.4 and Uk=.2. what is the friction force if an external horizontal force of 32N is exerted on the block
A child launches an air powered toy rocket up into the air giving it an initial velocity of 6m/s at an angle of 80degree above the horizontal. How long after the rocket is launched does it take for the rocket to hit the ground
A 2.0cm X 2.0cm parallel-plate capacitor has a 2.0mm spacing. The electric field strength inside the capacitor is 1.5×10^5 V/m. how much is the charge on each plate
Blocks with masses of 2 , 4 , and 6 are lined up in a row on the frictionless table. All three are pushed forward by a 56 force applied to the 2 block. How much force does the 4 block exert on the 6 block.
A rotating wheel requires 5.00 s to rotate 26.0 revolutions. Its angular velocity at the end of the 5.00-s interval is 99.0 rad/s. What is the constant angular acceleration (in rad/s) of the wheel
Provide your answer in m/s in scientific notation to three significant digits (i.e. 1.15*10^2)
A satellite is in a circular orbit about the earth (ME = 5.98 × 1024 kg). The period of the satellite is 1.20 × 104 s. Illustrate what is the speed at which the satellite travels?
Two vehicles are approaching an intersection. One is a 2400 kg pickup traveling at 18.0 m/s from east to west (the - x direction), What is the direction of the net momentum
Consider a capacitor created when two identical conducting plates are placed parallel and close to each in other in vacuum, what is the magnitude of the electrostatic force between the charged plates, Is the force attractive or repulsive
A 250 g block is dropped onto a relaxed vertical spring that has a spring constant of k = 3.5 N/cm, What is the speed of the block just before it hits the spring
A 73kg human sprinter can accelerate from rest to 12m/s in 3.2s . During the same interval, a 31kggreyhound can accelerate from rest to 19m/s. Compute the average power output for each
A capacitor has circular plates of radius 10 cm separated by 1 mm. If the capacitor is connected to a 12 volt battery, What will be the charge on the capacitor
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