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A rock is suspended from a scale reads 20.0 N. A beaker of water is raised up so the rock is totally submerged in the water. The scale now reads 12.5 N. What is the density of the rock?
If the initial speed of the block is increased to infinity, it turns out that the time taken for the block to come to a rest approaches a finite value whereas the distance traveled approaches infinity, Find the maximum time taken for the block to c..
You put your morning coffee in a copper mug. Assuming the coffee is boiling hot (100 *C), what is the temperature of the cup of coffee
An atom (not a hydrogen atom) absorbs a photon whose associated wavelength is 281 nm, How much net energy (in terms of eV) is absorbed by the atom
A highway curve with a radius of 400 m is banked properly for a car traveling 80 km/h. how much sideways force must the tires exert against the road if the car does not skid
If the ropes supporting the rings are attached to ceiling directly above, what is the tension in each rope.
He slides so that his speed is zero just as he reaches the base. Explain how much mechanical energy is lost due to friction acting on the runner? How far does he slide?
A jet engine emits sound uniformly in all directions, radiating an acoustic power of 2.17 × 102 kW. Find the intensity of the sound
An iron tower in is 340 meters tall on a cold day (=-8l4 degrees Celsius). What is the hight of the tower on a hot day whe the tempeture is 32.4 degrees Celsius
A pipe comes diagonally down the south wall of a building, making an angle of 45? with the horizontal. Coming into a corner, the pipe turns and continues diagonally down a west-facing wall, still making an angle of 45? with the horizontal. What..
The pressure exerted by a phonograph needle on a record is surprisingly large. what pressure is exerted on the record in N/m2
A block of ice slides 500 m down along a frictionless slope (slopes 20 degrees below horizontal). what is blocks speed at end of slop
An electron has an initial velocity of +2.00 x 104 m/s. It enters a region of space where it experiences an acceleration of +1.50 x 104 m/s2 over a distance of 1.00 centimeter. What size force is exerted on the electron
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