A student uses a plumb bob to verify that the doorjamb in a car is vertical. As the car pulls away from a stop, the student observes that the string now makes an angle ? with the doorjamb. Why does this happen?
What will be an ideal response?
The car and the plumb bob are both accelerating. The force exerted by the string on the plumb bob must have a forward component, and the string pulls along its own length, so it cannot be vertical.
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Sunspots
a. are cooler than their surroundings. b. are regions where material is rising from below the photosphere. c. are the result of convection. d. produce spicules. e. are generally found near the poles of the sun during sunspot maximum.
Photoelectric Effect Using Stopping Potential: When a photoelectric surface is illuminated with light of wavelength 437 nm, the stopping potential is measured to be 1.67 V. (1 eV = 1.60 × 10-19 J, e = 1.60 × 10-19 C, melectron = 9.11 × 10-31 kg, h = 6.626 × 10-34 J ? s)(a) What is the work function of the metal, in eV?(b) What is the maximum speed of the ejected electrons?
What will be an ideal response?
Thin Films: A soap bubble film that is 106 nm thick and has an index of refraction of 1.42 results in constructive interference in the reflected light if this film is illuminated by a beam of light with a wavelength of 601 nm. What are the next three thicknesses of this film that will also result in constructive interference?
A. 212 nm, 318 nm, 424 nm B. 53.0 nm, 35.3 nm, 26.5 nm C. 212 nm, 424 nm, 636 nm D. 67.0 nm, 42.4 nm, 22.3 nm E. 318 nm, 530 nm, 742 nm
Which unit best represents a field of view?
a. seconds b. square centimeters c. Celsius d. km