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A commuter train blows its 200-Hz horn as it approaches a crossing. The speed of sound is 335 m/s.
(a) An observer waiting at the crossing receives a frequency of 208 Hz. What is the speed of the train?
(b) What frequency does the observer receive as the train moves away?
A 75 kg skydiver can be modeled as a rectangular box withdimensions of 20cm x 40 cm x 180 cm. What is the terminal speed if he falls feet first
A 2.54 kg particle moving along the x-axis experiences the force shown, where Fmax=6.85 N, Fmin=-6.85 N, d1=1.27 m, d2=2.54 m, d3=3.81 m, and d4=5.08 m. At x=0.00 m the particle's velocity is 3.93 m/s. What is its velocity at x=2.54 m?
A candle is placed 16.0 cm in front of a convex mirror. When the convex mirror is replaced with a plane mirror, the image moves 7.5 cm farther away from the mirror. Find out the focal length of the convex mirror.
Must show all work!!! A block of mass m =.5kg is pushed against a wall with a force p = 4n orientated at an angle of 50 degrees. find the coefficient of static friction between the block and the wall
Neutron stars are so named because they are composed of neutrons and have a density the same as that of a nucleus. find the radius of a neutron star
If you drop an aspirin and it takes 0.18 sec to hit the table, how high above the table was the aspirin when it released?
Frames S and S' are moving relative to each other along the x and x' axes. They set their clocks to t = t' = 0 when their origins coincide, Compute the spacetime interval ?s between the events
Two blocks with mass m1=2kg and m2=3kg hang on either side of a pulley. Block m is on an incline at 30 degrees, Find the maximum extension of the spring.
A 75-kg person sits on a 3.7-kg chair. Each leg of the chair makes contact with the floor in a circle that is 1.5 cm in diameter. Find out the pressure exerted on the floor by each leg of the chair; assume the weight is evenly distributed.
I once observed a woman on an airplane at night with a camera. As we flew low over Washington DC she was impressed with the view of the city lights in the dark. She stood back in the aisle and tried to take the picture by the window using her flash. ..
A uniform disk with mass m = 9.27 kg and radius R = 1.42 m lies in the x-y plane and centered at the origin. What is the magnitude of the torque on the disk about the z axis due to F1
It takes a minimum distance of 48.96 m to stop a car moving at 12.0 m/s by applying the brakes (without locking the wheels). Assume that the same frictional forces apply and find the minimum stopping distance when the car is moving at 26.0 m/s.
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