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If an ice cube melts at 0oC but water also freezes at 0oC, what is the difference between melting and freezing in terms of (a) the energy involved in the phase changes and (b) particles of the substances during the phase changes?
In a science museum, a 100kg brass pendulum bob swings at the end of a 16.9m -long wire. At exactly 12:00 noon, how many oscillations will the pendulum have completed
Find the semimajor axis of the ellipse. (Hint: Draw a picture showing Sun and the orbits of Earth, Mars, and the spacecraft. Treat the orbits of Earth and Mars as circles.)
An RC circuit consisting of a 150 μF capacitor and a 1 MΩ resistor is connected to a 100-V battery for a long time, and then the battery is shorted. After 30 s, a second identical resistor is placed in parallel with the original. What is the volta..
What is the magnitude of the force (in N) the second child must exert to keep the door from moving? Assume friction is negligible.
two blocks connected by a light cord over a pulley. This apparatus is known as an Atwood's machine. what is the speed of the lighter block
Light of two wavelengths, ? = 520 nm and ?' = 550 nm falls normally on a diffraction grating having 3500 lines/cm. Determine the distance between the two spectrum lines in the first order. Repeat for the second order
A 7.42-g bullet is moving horizontally with a velocity of +362 m/s, where the sign + indicates that it is moving to the right, find the velocity of the second block after the bullet imbeds itself
Two wires have the same length and the same resistance. One is made from aluminum and the other from copper. Obtain the ratio of the cross-sectional areas
an open vertical tube has water in it. a tuning fork vibrates over its mouth. as the water level is lowered in the tube
A car of mass m = 1410 kilogram is pushed off a cliff of height h = 23 meter. obtain the kinetic energy of the car the instant after it left the cliff
X-rays with an initial wavelength of 0.0575 nm scatter at an angle of 76.1° from the loosely bound electrons of a target material. What is the wavelength of the scattered radiation
on a frozen pond a 10kg sled is given a kick that imparts to it an intial speed of v0 2.0ms. the coefficient of the
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