One difference between a microscope and a telescope is that the image formed by the objective is
A. real for the microscope but virtual for the telescope.
B. virtual for the microscope but real for the telescope.
C. real for both, but the image is enlarged for the microscope and reduced for the telescope.
D. real for both, but the image is reduced for the microscope and enlarged for the telescope.
Answer: C
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Current estimates place the age of the universe at about ________
A) 14 billion years B) 4 1/2 billion years C) 10 million years D) 10 billion years
Two charged particles near each other are released. As they move, the force on each particle increases. Therefore, the particles have
A) the same sign. B) the opposite sign. C) not enough information
The space time diagram in figure R2.12 shows the world lines of various objects. Which object has the largest speed at time t = 1 s?
A. A
B. B
C. C
D. D
E. E
Springs: A force of 30 N stretches a very light ideal spring 0.73 m from equilibrium. What is the force constant (spring constant) of the spring?
A. 41 N/m B. 22 N/m C. 34 N/m D. 46 N/m