Which of the following statements is true?
a. For an object at a concave mirror's center of curvature, the image is real and upright.
b. For an object in front of a convex mirror, the image is always virtual and upright
c. As an object approaches the focal point of a concave mirror, the image size shrinks to zero.
d. All of the above statements are true.
b. For an object in front of a convex mirror, the image is always virtual and upright
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A steel lift column in a service station is 4.0 m long and 0.20 m in diameter. Young's modulus for steel is 20 × 1010 N/m2. By how much does the column shrink when a 5000-kg truck is on it?
A) 4.7 × 10-7 m B) 8.0 × 10-7 m C) 3.2 × 10-6 m D) 7.8 × 10-6 m E) 3.1 × 10-5 m
The moment of inertia about the x axis of the parallelogram in Problem 5.3 is:
(A) bh3/3 (B) 2bh3/3 (C) bh3/4 (D) bh3/2
Around other suns, we have found Jupiters where Mercury should be
Indicate whether the statement is true or false
What is the "chicken-and-egg" type problem we face when trying to decide which came first–proteins or nucleic acids?
A) proteins and nucleic acids probably looked very different before the origin of life B) nucleic acids cannot replicate without proteins, and proteins cannot be made without nucleic acids C) early proteins and nucleic acids were very similar to each other D) proteins and nucleic acids are always present together at the same time