Diffraction occurs because
1.light must slow down to turn sharp corners, causing a phase difference; because of that phase difference, interference occurs.
2.light spreads out after passing an edge, such as the edges of a slit, causing interference.
3.the light from two monochromatic sources in phase with each other interfere.
4.edges, such as those on a penny, cause the light to behave as if there were twice as many sources, and those virtual sources interfere with each other.
2
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A water rocket built from a two-liter bottle half-filled with water pressurized with compressed air can develop a thrust of 300 N
At what rate would water have to come out of the rocket to develop that thrust? The jet of water emerging from the bottle has a diameter of 2.20 cm and the density of water is 1000 kg/m3. A) 2.70 kg/s B) 5.30 kg/s C) 10.7 kg/s D) 32.1 kg/s E) 21.4 kg/s
A protostar of 20 solar masses should form a star that will stay on the main sequence twenty times longer than our Sun
Indicate whether the statement is true or false
The kinetic friction force that a horizontal surface exerts on a 60.0-kg object is 50.0 N. If the initial speed of the object is 25.0 m/s, what distance will it slide before coming to a stop?
A) 15.0 m B) 30.0 m C) 375 m D) 750 m
Starting outside the region with the magnetic field, a single square coil of wire enters, moves across, and then leaves the region with a uniform magnetic field 
perpendicular to the page so that the graph shown below represents the induced emf. The loop moves at constant velocity
. As seen from above, a counterclockwise emf is regarded as positive. In which direction did the loop move over the plane of the page?
a.
The loop moved from bottom to top.
b.
The loop moved from top to bottom.
c.
The loop moved from left to right.
d.
The loop moved from right to left.
e.
All of these directions of motion will produce the graph of emf vs t.