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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In common physics terminology, a particle with a negative potential energy is in a(n) potential ______________
Fill in the blank(s) with correct word
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.
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