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A signal rocket explodes at a height of 200m above a ship on the surface of a smooth lake. The explosion sends out sound waves in all directions.Since the speed of sound in water (1500m/s) is larger than the speed of sound in air (340m/s), a sound wave can suffer total reflection at a water surface if it strikes at a sufficiently large angle of incidence. At what minimum distance from the ship will a sound wave from the explosion suffer total reflection?
A cyclist starts from rest and pedals such that the wheels of his bike have a constant angular acceleration. What is the angular acceleration of the wheels
a bird lands on a bare copper wire carrying a current of 33 a. the wire is 8 gauge which means that its cross-sectional
a bat locates insects by emitting ultrasonic chirps and then listening for echoes from the bugs. suppose a bat chirp
A solenoid of length 5.6 cm and diameter 0.88 cm is wound with 167 turns per cm. The current is decreasing at a rate of 37.4 A/s. What is the induced emf in the entire solenoid
A speeder is pulling directly away and increasing his distance from a police car that is moving at 23 m/s with respect to the ground. Find the speeder's speed with respect to the ground
An oscillating block-spring system has a mechanical energy of 2.27 J, an amplitude of 8.07 cm, and a maximum speed of 1.43 m/s. Find (a) the spring constant, (b) the mass (in kg) of the block and (c) the frequency (in Hz) of oscillation.
A jetliner can fly 5.32 hours on a full load of fuel. Without any wind it flies at the speed of 220 m/s. The plane is to make a round-trip by heading due west for a certain distance, turning around, and then heading due east for the return trip.
the 500N weight is supported by two cables, the cable forces being F1 and F2. knowing that the resultant of F1 and F2 is a force of magnitude 500N acting in Y-direction, determine F1 and F2.
A girl pulls a box of mass m = 6 kg across a floor with a constant horizontal force F = 22 N. Initially the block is at rest. For the first d1 = 7 m, What is work done on the box by friction in moving the box over the distance d1 + d2
Manufacturers of wire (and other objects of small dimensions) sometimes use a laser to continually monitor the thickness of the product. The wire intercepts the laser beam, producing a diffraction pattern like that of a single slit of the same wid..
When a 5.0 µF capacitor is connected to a generator whose rms output is 28 V, the current in the circuit is observed to be 0.30 A. What is the frequency of the source
A river flows due south with a speed of 4.00m/s . A man steers a motorboat across the river; his velocity relative to the water is 3.80m/s due east. What is the direction of his velocity relative to the earth
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