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When you look down into a swimming pool or lake, are youlikely to underestimate or overestimate its depth? Explain. How does the apparent depth vary with the viewing angle? (Use raydiagrams)
A computer disk is 8.0 in diameter. A reference dot on the edge of the disk is initially located at the disk accelerates steadily for 0.50, reaching 2000.
An ac generator supplies a peak (not rms) voltage of 120.0 V at 60.0 Hz. It is connected in series with a 50.0-Ω resistor, What is the rms voltage of the generator
A 45kg pole-vaulter running at 12 m/s vaults over the bar. Her speed when she is above the bar is 1.90m/s. Avoid air resistance and determine her height as she crosses the bar.
If the trough is being filled with water at the rate of 0.3 m3/min explain how fast is the water level rising when the water is 10 cm deep?
A 54.0 g sample of a conducting material is all that is available. The resistivity of the material is measured to be 11 10-8 ·m, What must be the diameter of the wire
in a 10ft^2 room wiyh no window and no doors . The air in the room is 79% N(sub2) and 21% O(sub2). What is the weight of the air
What is an acceleration of the car
parallel plates that have an opposite charge have a distance of 5.33 mm between them, and a 600V potential difference. What is the magnitude of the electric field strength
A 4.90-kg ball, moving to the right at a velocity of +2.14 m/s on a frictionless table, Find the magnitude and direction of the final velocity of the two balls if the collision is completely inelastic
A 16.8-kg sled is being pulled across a horizontal surface at a constant velocity. The pulling force has a magnitude of 73.0 N and is directed at an angle of 22 ° above the horizontal. Determine the coefficient of kinetic friction.
Net average force using the concepts of Newton’s second law.
A heat pump extracts 7.0*10^6 J heat per hour from a well at 280K and delivers its output heat into a house at 320K. what minimum work must be supplied to the heat pump per hour
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