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A monochromatic point source of light emits 5.5 W of electromagnetic power uniformly in all directions. Find the (magnitude of the) Poynting vector at a point situated at each of the following locations:(a) 0.45 m from the source(b) 0.51 m from the source(c) 1.00 m from the source
At t = 0 a grinding wheel has an angular velocity of 25.0 rad/s. It has a constant angular acceleration of 21.0 rad/s2 until a circuit breaker trips at t = 1.81 s. What was its acceleration as it slowed down
In very cold weather, a significant mechanism for heat loss by the human body is energy expended in warming the air taken into the lungs with each breath. How much heat is lost per hour if the respiration rate is 20 breaths per minute
A spring of k=8 N/m has a block of mass 15 kg attached to it on a frictionless table. how fast will it be moving at its equilibrium position
Draw labor market demand and supply graphs showing the change in labor demand and/or labor supply in the U.S. and in Mexico resulting from this program.
A 2.5kg cannonball is fired from the top of a cliff. The cannonball leaves the cannon at a height of h=75 m above the ground below. what is the speed of the cannonball just before it hits the ground
A firehose 15 m long is uncoiled by pulling the nozzle end horizontally along a frictionless surface at the steady speed of 2.9 m/s. How much work has been done on the hose by the applied force
A long solenoid, with its axis along the x axis, consists of 180 turns per meter of wire that carries a steady current of 15.0 A. A coil is formed by wrapping 30 turns of thin wire around a circular frame that has a radius of 7.00 cm. The coil is ..
An object is placed to the left of a convex lens and on the optical axis. find the magnification of the image formed by the lens
A 1.50mm -diameter glass bead is positively charged. The potential difference between a point 1.50mm from the bead, What is the charge on the bead
If there is a section of the hose where the diameter decreases to 1.93 cm, what is the speed of the water in this section
q1. a woman is riding a boat at the speed of v when she notices a seawall straight ahead. the farthest she can lean the
An airplane is flying with a velocity of 240 m/s at an angle of 30.0° with the horizontal. What is the angle
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