Suppose we discover a new comet on an orbit that brings it closer to the Sun than Mercury every 125 years. What can we conclude?
A) It has a coma and tail during most of each orbit.
B) It came from the Kuiper belt.
C) It has been on its current orbit for only a very short time compared to the age of our solar system.
D) It came from the Oort cloud.
C
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Modern nuclear bomb tests have created an extra high level of 14C in our atmosphere. Suppose that future archaeologists date samples from our era, but do not know about this testing
Will their dates be too young, too old, or still correct? If correct they are correct, why? A) too young B) too old C) correct, because 14C from bomb tests is different from that produced naturally D) correct, because modern biological materials do not gather 14C from bomb tests
When resistors with different resistances are connected in series, which of the following must be the same for each resistor? Choose all correct answers
1.potential difference 2.current 3.power delivered 4.charge entering 5.none of these answers
Two objects, one of mass m and the other of mass 2m, are dropped from the top of a building. When they hit the ground
A) both of them will have the same kinetic energy. B) the heavier one will have twice the kinetic energy of the lighter one. C) the heavier one will have four times the kinetic energy of the lighter one. D) the heavier one will have times the kinetic energy of the lighter one.
An object is placed 10 cm from a convex lens of focal length 20 cm. What is the lateral magnification of the object?
A) 2.0 B) 2.5 C) 0.50 D) 1.0 E) 1.5