What is the angular speed in rad/s of the minute hand of a clock?
What will be an ideal response?
0.105 rad/s
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A positively charged particle has a velocity in the negative z direction at point P. The magnetic force on the particle at this point is in the negative y direction. Which one of the following statements about the magnetic field at point P can be determined from this data?
A. Bx is positive. B. Bz is positive. C. By is negative. D. By is positive. E. Bx is negative.
The __________ occurs when electrons are emitted when light strikes the surface of a metal
Fill in the blank(s) with correct word
Photography Optics: A 35-mm digital camera using a standard 50.0 mm lens is focused on a 1.80 m tall person who is standing 3.25 m from the lens. You now refocus the camera on a 15.0 cm tall flower that is 75.0 cm from the lens.(a) In refocusing, by how much did you move the lens? Did you move it toward the film or away from it?(b) What is the height of the flower's image on the CCD sensor?
What will be an ideal response?
Sunspots are dark because
a. regions of the photosphere are obscured by material in the chromosphere. b. shock waves move through the photosphere. c. the Sun rotates differentially. d. they are cooler regions than the photosphere. e. they radiate their energy into space faster than the rest of the photosphere.