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A streetlight contains two identical bulbs 3.3 m above the ground. If the community wants to save electrical energy with removing one bulb, how far from the ground must the streetlight be positioned to have the same illumination on the ground under the lamp?
A cubic meter of some material has a mass of 5200 kg. Find the buoyant force on the block and the tension in the cable
The Sun radiates energy at a rate of regarding 4 x 10^26 W (a) At what rate is the Sun's mass decreasing? (b) Estimate how long the Sun could last if it radiated persistently at this rate. Mass of the sun is 1.99 x 10^30 kg.
A 3.4 kg bucket of water is raised from a well by a rope. If the upward acceleration of the bucket is 2.2 m/s2, find the force exerted by the rope on the bucket
On his honeymoon, James Joule attempted to explore the relationships among various forms of energy by measuring the rise of temperature of water which had fallen down a waterfall on Mount Blanc. What maximum temperature rise would one expect for a wa..
A beanbag is thrown horizontally from a dorm room window a height h above the ground. find the direction of the beanbag's velocity just before impact
On a cold day, 25000 J of heat leaks out of a house. The inside temperature is 22 °C, What is the increase in the entropy of the universe that this heat loss produces
A cyclist starts from rest and coasts down a 4.0?hill. The mass of the cyclist plus bicycle is 85 kg. Ignore air resistance and friction. How fast is the cyclist going
one hundred meters of 2.0mm diameter wire has a resistance of 0.532 ohm. What is the resistivity of the material from which the wire is made
If a mass is hung from a spring (whose spring constant is 2 pounds per foot) stretches the spring 0.4 meters (m), What is the force on the spring in Newtons (N)?,
two positive point charges each 16 uc lie along the x-axis at x -0.12m and x 0.12m.a. find the electric field at the
An asteroid of mass 1.00 x 10^9 kg comes from deep space and fallstoward Earth. Assume the asteroid started the fall from rest very far from Earth, and find the change in potential energy when it reaches a point 4.00 x10(8) m from Earth (that's jus..
a battery of emf 10 v and internal resistance 3nbspomega is connected to a resistor. if the current in the circuit is
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