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A 45.0 kg girl is standing on a 152 kg plank. The plank, originally at rest, isfree to slide on a frozen lake, which is a flat, frictionlesssurface. The girl begins to walk along the plank at a constantvelocity of 1.43 m/s relative to theplank.
(a) What is her velocity relative to thesurface of ice?
m/s
(b) What is the velocity of the plank relative to the surface ofice?
Flywheels are large, massive wheels used to store energy. They can be spun up slowly, How much energy is stored in the flywheel
q1. a series r-l-c circuit of r 200 ohms l 0.900 h and c 2.00 uf carries an rms current of 0.250 a with the
question1two plates detached by a distance 16.8 mm are charged to a potential dissimilarity of 7.25 volts. a constant
A two-slit interference experiment is set up, and the fringes are displayed on a screen. How does the fringe pattern change
The distance from the center of the oxygen atom to the center of a hydrogen atom is 0.96 A, Find the center-to-center distance between the hydrogen atoms
An electron in the hydrogen atom is in an excited state given by (n=4, l=3, ml=2, ms=1/2). List the possible final states the system could be in after the emission of photon. Include in the list the energies of the photon.
A 950-kg satellite orbits the Earth at a constant altitude of 105-km. What is the change in the system's kinetic energy
A thin film of plastic (n = 1.43) coats a piece of glass (n = 1.6). What is the minimum thickness of the film for which 500 nm light does not reflect off of it
Explain why the electron density of hydrogen is very nearly 6x10^26 electrons/kg. Explain why the electron density of all other low atomic number materials is nearly 3 x 10^26 electrons/kg. speculate why the electron density of materials might differ..
Two cars have collided at right angles at an intersection: Car A was eastbound; car B was northbound. The marks on the pavement show that the vehicles both moved together in the same direction immediately after the collision. That direction was at..
A small statue is recovered in an archaeological dig. Its weight is measured to be 2.1 lb and its volume 0.06 ft3, What is the statue's weight density
What is the horizontal distance x (in metres) to the base of the wall supporting the mirror of the nearest point of the floor that can be seen reflected in mirror.
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