A photon whose energy is 8.00 × 10^-15 J is scattered off an electron at a 90° angle. What is the wavelength of the scattered wave?
a. 2.73 × 10^-11 m
b. 2.25 × 10^-11 m
c. 2.50 × 10^-11 m
d. 2.40 × 10^-12 m
e. 2.48 × 10^-11 m
A
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Thin Lenses: An object is placed 10 cm from a convex lens with a focal length of magnitude 20 cm. What is the magnification?
A. 0.50 B. -2.0 C. 1.5 D. 2.0 E. -2.5
The rear window in a car is approximately a rectangle, 2.1 m wide and 0.45 m high. The inside rearview mirror is 0.55 m from the driver's eyes, and 1.70 m from the rear window.
a) What is the minimum length for the rearview mirror if the driver is to be able to see the entire width and height of the rear window in the mirror without moving her head? b) What is the minimum height for the rearview mirror if the driver is to be able to see the entire width and height of the rear window in the mirror without moving her head?
Two blocks in contact with each other are pushed to the right across a rough horizontal surface by the two forces shown. If the coefficient of kinetic friction between each of the blocks and the surface is 0.30, determine the magnitude of the force exerted on the 2.0-kg block by the 3.0-kg block
a.
15 N
b.
25 N
c.
11 N
d.
22 N
e.
33 N
An incompressible fluid flows irrotationally through a tube of circular crosssection that has greater diameter at one end than the other. What conclusion can you reach about the speed of the fluid at the ends of the tube?
A) The flow must be at a slower speed at the end with a greater diameter. B) The speed of the flow must be the same at both ends. C) Pressures and tube heights must be known to relate the flow speeds at the two ends. D) The flow must be at a faster speed at the end with a greater diameter. E) No conclusions can be reached based on this information.