A concave mirror has a focal length of 20 cm. What is the position (in cm) of the object if the image is upright and is two times larger than the object?
a. 30
b. 20
c. 10
d. 40
e. 60
c
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Heat Engines: A heat engine with an efficiency of 30% performs 2500 J of work. How much heat is discharged to the lower temperature reservoir?
A. 5800 J B. 8300 J C. 750 J D. 1400 J E. 7100 J
If part of the full Moon passes through Earth's umbra, we will see a(n)
A) total lunar eclipse. B) penumbral lunar eclipse. C) partial lunar eclipse. D) partial solar eclipse. E) annular eclipse.
The spectral lines of a star indicate ionized helium is prominent, yet the star appears orange in color. Explain the problem with this and offer an explanation
What will be an ideal response?
Light with an average intensity of 683 W/m2 falls on a black surface and is completely absorbed. What is the radiation pressure that the light exerts on this surface if it strikes perpendicular to the surface?
(c = 3.00 × 108 m/s) A) 1140 nN/m2 B) 2280 nN/m2 C) 4550 nN/m2 D) 205,000 N/m2