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A point source of light is submerged 2.0 m below the surface of a lake and emits rays in all directions. On the surface of the lake, directly above the source, the area illuminated is a circle. What is the maximum radius that this circle could have?
400 L of water is at 4 oC. If it took a heat 600 seconds to heat this up to 6 oC, what is the power rating of the heater
An electric dipole of dipole moment 4.5 x 10-9 C·m is in a 250 N/C electric field, what is the potential energy
A 5kg steel ball is dropped onto a copper plate from a heightof 10m. If the ball leaves a dent 3.2mm deep, what is the average force exerted by the plate on the ball during impact
A horizontal force of 20.0 N is needed to hold the object at rest when it is pulled 0.200 m from its equilibrium position (the origin of the x axis).The object is now released from rest by an initial position of xi =0.200 m, and it subsequently under..
A college campus features a large fountain surrounded by the circular pool. Two students start at the northernmost point of pool and walk slowly around it in opposite directions.
The focal length of a magnifying glass is 4.5 cm. To magnify an object do you place it at 3.0 cm or at 5.0from the glass? If the near-point is 30 cm, find the magnification for the image at infinity
A series RCL circuit driven at angular frequency w = 780 rad/s has a capacitive reactance XC = 920 ohms, What is the average power consumption of the circuit
A gardener pushes a box of tools across a driveway by applying a 22.5- N force that pushes downward at an angle of 23.1 o, How much work is done if the box moves 2.55 m in the horizontal direction
How many transitions involving the hydrogen energy levels (solid lines) shown in the diagram correspond to photons of visible light? How many transitions involving the hydrogen energy levels shown correspond to photons of infrared light?
question a group of swimmers is resting in the sun on an off-shore raft. they estimate that 3.44 m separate a trough
Two blocks are connected by a string. The smooth inclined surface makes the angle of 35 degrees with the horizontal, and the block on the incline has a mass of 5.7 kg.
An athlete has a large lung capacity, 7.0 L. Assuming air to be an ideal gas, how many molecules of air are in the athlete's lungs
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