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A stationary motion detector sends sound waves of 0.7 MHztoward a truck approaching at a speed of 55.0 m/s. The speed ofsound in the air is 343 m/s. What is the frequency of the waves reflected back to the detector?
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Quesiton: You stand at the top of a deep well. To determine the depth (D) of the well you drop a rock from the top of the well and listen for the splash as the water hits the water†TM s surface. The splash arrives t = ...
Question: A rifle with a barrel length of 57 cm fires a 11 g bullet with a horizontal speed of 370 m/s . The bullet strikes a block of wood and penetrates to a depth of 12 cm . 1- What resistive force (assumed to be cons ...
Question: The sun emits electromagnetic waves with a power of 4 x 1026W. a) Determine the intensity of electromagnetic waves from the sun just outside the atmospheres of Venus. b) Determine the intensity ofelectromagneti ...
Question: A student is working in an optics lab and has a light bulb which is 90 cm from a screen. She needs to make a real image of the bulb on the screen and she has a positive lens with a focal length of 12.5 cm. Find ...
question: A single loop of wire with an area of 9.03Ã-10-2 m^2 is in a uniform magnetic field that has an initial value of 3.66 T, is perpendicular to the plane of the loop, and is decreasing at a constant rate of 0.199 ...
A body moving with uniform acceleration has a velocity of 18.9 cm/s when its x coordinate is 1.88 cm. If its x coordinate 2.68 s later is -5.03 cm, what is the x-component of its acceleration? Answer in units of cm/s2.
Question: A roller coaster moves 200 ft horizontally, then rises 135 ft at an angle of 30.0° above the horizontal. Next, it travels 135 ft at an angle of 40.0° below the horizontal. Use graphical techniques to find the r ...
Question: An old-fashioned single-play vinyl record rotates on a turntable at 38.0rpm . What are (a) the angular velocity in rad/s and (b) the period of the motion? The response must be typed, single spaced, must be in t ...
Question: Six artificial satellites complete one circular orbit around a space station in the same amount of time. Each satellite has mass m and radius of orbit L. The satellites fire rockets that provide the force neede ...
Question: At t=0 a grinding wheel has an angular velocity of 30.0rad/s . It has a constant angular acceleration of 27.0rad/s^2 until a circuit breaker trips at time t = 1.60s . From then on, it turns through an angle 433 ...
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