The objective lens of a telescope has a focal length of 1.90 m. When viewed through this telescope, the Moon appears 5.25 times larger than normal. How far apart are the objective lens and the eyepiece when this instrument is focused on the Moon?
What will be an ideal response?
2.26 m
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The ionization energy of the hydrogen atom is 13.6 eV. What is the energy of the n = 5 state?
a. –0.544 eV c. 0.544 eV b. 0.378 eV d. –0.378 eV
A stone thrown horizontally from a cliff with an initial speed of 10 m/s hits the bottom of the cliff in 4.3 s. What is the height of the cliff?
A. 22 m B. 43 m C. 69 m D. 91 m
Determine the net force (Fnet) on an object that experiences the following four forces:
40 N downward gravity 30 N upward normal force 20 N rightward app. force 20 N leftward friction force A. 0 N B. 10 N C. 50 N D. 100 N
An object of mass 4 kg is thrown vertically upwards from ground level with an initial speed of 20 m/s. Ignore friction and use g = 10 m/s2. What is the kinetic energy of the object as it reaches its maximum height?
A) 800 J B) 400 J C) 200 J D) 0 J E) 80 J