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Two submarines are underwater and approaching each other head-on. Sub A has a speed of 18 m/s and sub B has a speed of 14 m/s. Sub A sends out a 1040-Hz sonar wave that travels at a speed of 1522 m/s.
(a) What is the frequency detected by sub B (to the nearest Hz)?
(b) Part of the sonar wave is reflected from B and returns to A. What frequency does A detect for this reflected wave (to the nearest Hz)?
A rocket moves upward, starting from rest with an acceleration of 29.9 m/s2 for 3.31 s. It runs out of fuel at the end of the 3.31 s but does not stop. Evaluate how high does it rise above the ground?
A person exerts a force of 48 N on the endof a door 86 cm wide. What is the magnitude of the torque if the force is exerted perpendicular to the door?
THe index of refraction of gold is n= .31 + i2.88 at 560nm, and n=12.2 + i54.7 at 9.92um. Find the normal incidence absorptivity and reflectivity at both wavelengths. Please show each step by step.
A test tube contains 2.56 10-4 m3 of liquid carbon tetrachloride at a temperature of 75.5° C. Find the volume of carbon tetrachloride in the test tube at -11.7° C
question a current of 5 amp exists in a 10ohm resistance for 4 minutes. how many coulombs and how many electrons pass
A 120 kg hiker puts on a pair of snowshoes that have an effective combined surface area of 0.80 square meters. How much pressure does he exert on the snow
A uniform solid sphere of mass 1.5 kg and diameter 30.0 cm starts from rest and rolls without slipping down a 35° incline that is 7.0 m long. Determine the angular speed of the sphere about its center at the bottom of the incline
A helicopter is ascending vertically with a speed of 9 m/s. At a height of 200 m above the Earth, a package is dropped from a window. How much time does it take for the package to reach ground.
A 650 kg elevator starts from rest. It moves upward for 4.50 s with constant acceleration until it reaches its cruising speed, 1.75 m/s. What is the average power of the elevator motor during this period
A stone is dropped into a river from a bridge 41.9 m above the water. What is the initial speed of the second stone
Light of wavelength 572 nm illuminates a single 0.72 mm wide slit. What is the width of the central maximum
A 0.03 kg (lead) bullethits a steel plate and melts and splatters on impact. Assuming that the bullet recieves 80% of the collision energy, at what minimium speed must it travel to melt on impact? How is this soved without knowing what the bullet is ..
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