A camera with changeable lenses produces an image of an object that is 3.0 mm wide on the film when the 50.0 mm lens is used. When the 135 mm lens is used, how wide is the image of the object on the film?
A. 3.0 mm
B. 85 mm
C. 4.5 mm
D. 0.37 mm
E. 8.1 mm
E. 8.1 mm
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Concrete cubes at 60ºF are heated in a kiln which is at 400ºF and with a convective heat transfer coefficient of 5 Btu/hr?ft2?0F. Using thermal conductivity of 0.79 Btu/hr?ft?ºF, specific heat of 0.21 Btu/lbmºF, and thermal diffusivity of 8.3 x 10^-6 ft^2/s, determine the center temperature and the corner temperatures after 3 hours.
What will be an ideal response?
A planetary nebula is visible due to ____
a. blackbody continuum radiation from the interstellar medium b. line emission from the interstellar medium c. scattering from dust grains ejected by a dying star d. blackbody continuum radiation from a hot gas ejected by a dying star e. line emission from ionized hydrogen gas ejected by a dying star
If you know the impulse that has acted on a body of mass m you can calculate
a. its initial velocity. b. its final velocity. c. its final momentum. d. the change in its velocity. e. its acceleration during the impulse.
Assume electrons are accelerated through a potential difference of 25 000 V inside a TV picture tube. What is the minimum wavelength that could be produced when the electrons strike the phosphor? (1 Å = 10-10 m)
a. 0.50 Å b. 1.0 Å c. 10 Å d. 100 Å e. 0.25 Å