What is the Trapezium?
A. Four massive stars at the heart of the Orion Nebula
B. Three massive stars on the outskirts of the Orion Nebula
C. A few hot stars whose ultraviolet light is affecting the formation of other stars
D. Both A and C
E. Both B and C
Answer: D. Both A and C
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Ideal Gas Law: How many moles are there in 2.00 kg of copper? The atomic weight of copper is 63.5 g/mol and its density is 8.90 g/cm3.
A. 15.3 B. 31.5 C. 51.3 D. 53.1
Two children, each of mass 20.0 kg, ride on the perimeter of a small merry-go-round that is rotating at the rate of 1.0 revolution every 4.0 s. The merry-go-round is a disk of mass 30. kg and radius 3.0 m
The children now both move halfway in toward the center to positions 1.5 m from the axis of rotation. Calculate the kinetic energy before and after, and the final rate of rotation. Explain any changes in energy.
In common physics terminology, a particle with a negative potential energy is in a(n) potential ______________
Fill in the blank(s) with correct word
Four identical springs each have the same spring constant k. If these four springs are attached end to end forming a spring four times the length of one of the original springs, what will be the spring constant of the combination?
a. k c. 4k b. k/4 d. 1.41k