How far from a covnex lens of focal length 30 cm must an object be placed so the image will be virtual and 3.0 times as large as the object?
What will be an ideal response?
20 cm
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The description large somewhat dirty snowball model fits the physical structure of ____________________
Fill in the blank(s) with correct word
The Eiffel tower in Paris is made primarily of iron, whose coefficient of linear expansion is about 10 x 10-6/°C. On a cold day when the temperature is –10°C the Eiffel tower is 300 meters tall. Its height on a hot day when the temperature is 40°C is __________
Fill in the blank(s) with correct word
Some of the oldest continental crust on Earth lies in
A) Hawaii. B) California. C) the Great Plains. D) the deep South. E) Northeastern Canada.
A rocket coasts in an elliptical orbit about Earth. To attain escape velocity using the least amount of fuel in a brief firing time, should it fire off at the apogee, or at the perigee? (Hint: Let Fd = ? KE guide your thinking.)
A) perigee, where it is closest and fastest B) apogee, where it is farthest and slowest C) same at either location D) same at any location