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The figure below shows four isotropic point sources of sound that are uniformly spaced on an x axis. The sources emit sound at the same wavelength λ and same amplitudes, and they emit in phase. A point P is shown on the x axis. Suppose that as the sound waves travel to P, the decrease in their amplitude is negligible. What multiple of sm is the amplitude of the net wave at P if distance d in the figure is (a) 1λ,(b) 2λ, and (c)4λ?
A 1430-N uniform beam is attached to a vertical wall at one end and is supported by a cable at the other end. A 1960-N crate hangs from the far end of the beam. Using the data shown in the figure, find (a) the magnitude of the tension in the wire and..
The drawing shows a person (weight W = 598 N, L1 = 0.829 m, L2 = 0.409 m) doing push-ups. Find the normal force exerted by the floor on each hand
A person of mass 75 kg stands at the center of a rotating merry-go-round platform of radius 3.1 m and moment of inertia 1300 kg ·m2. Calculate the angular velocity when the person reaches the edge
A 200KeV electron (i.e., an electron having kinetic energy of 200KeV) collides with a 200KeV positron (a particle with opposite charge of electron but) moving in the opposite direction in a head-on collision.
The earth has a radius of approximately 6400 km. how fast would it have to travel
A small spherical cavity of radius r is made in a large electrics (a dielectric material) of constant polarization P. Neglecting the effects of outer boundaries of the electrets find the electric field at the center of the cavity.
A transformer operating from 79 V (rms supplies a 18.3 V lighting system for a garden. Find the equivalent resistance of the system
a 150g bullet is fired from a rifle with a barrel of length 65cm the bullet starts from rest at one end of the barrel, find the speed of the bullet as it leaves the rifle
a 400 kg mass is released at rest from a distance of two earth radii above the surface of the earth. find the speed of
A parachutist descending at a speed of 10.0 m/s loses a shoe at an altitude of 30.0 m. (Assume the positive direction is upward.). Explain when does the shoe reach the ground? What is the velocity of the shoe just before it hits the ground?
maddox takes off on his jet ski so they have a combined mass of 334.97kg. the skis have a thrust of 1087.97n and a
A generator has a square coil consisting of 600 turns. The coil rotates at 66 rad/s in a 0.32 T magnetic field. What is the length of one side of the coil
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