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A river has a steady speed of 0.500 m/s. A student swims upstream a distance of 1.00 km and swims back to the starting point. If the student can swim at a speed of 1.20 m/s in still water, how long does the trip take? Compare this with the time the trip would take if the water were still.
Suppose that on earth you can throw a ball vertically upward a distance of 1.02 m. how high could you throw a ball on Pluto
In a hydraulic lift, the maximum gauge pressure is 18.5 atm. what is the heaviest vehicle that can be lifted
De Broglie postulated that the relationship ? = h/p is valid for relativistic particles. What is the de Broglie wavelength for a (relativistic) electron
an otherwise empty room contains 6 x 1026 air molecules. how many times more probable is it that they are split exactly
Two slits are separated by .1 mm. Planar light incident on them produces a diffraction pattern on a board 1.35 m away, estimate the wavelength of light
how much force is needed to stretch a spring k 1000 nm by 8 cm? a simple pendulum has a period t. if we double the
The coils of a motor's rotor have resistance of 2.0 Ω. When the motor runs at full speed, powered by 115V linevoltage it draws a current of 9A. What is the back electromagnetic field (emf) in this motor under those conditions? If the motor is preve..
The area of a typical eardrum is about 5.0 × 10?5 m2. (a) Calculate the sound power (the energy per second) incident on an eardrum at the threshold of hearing. W (b) Calculate the sound power incident on an eardrum at the threshold of pain. W
For reference LWR: thermal efficiency is 33%, power 1150 MWe, 92% CF, uranium is $46/lb. U3O8, SWU is $114/kgSWU, conversion is $12/kgU, fabrication and transportation cost $295/kgU, losses in fabrication 0.12%
A 50-g block of an unknown material is at 530°C. It is dropped into a thermally insulated cup containing 0.07L of water at 20°C. If the temperature of the compound rises to 50°C, what is the specific heat of the unknown material?
The drawings show three charges that have the same magnitude butdifferent signs. In all cases the distance d between the charges isthe same. The magnitude of the charges is , and the distance between themis d = 3.8 mm. Determine the magnitude of t..
As now ball which is thrown horizontally from the top of abuilding that is 11.0 m high lands 24.0 m from the base of thebuilding. How fas was the snowball travelling when it was thrown
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