If the angular diameter of an object is 15 arc seconds and it is 1.4 billion kilometers away, how big is its physical size? Show how you arrived at your answer
What will be an ideal response?
Use the equation above Example 3 in More Precisely 1-2 to complete the calculation. 15" = 15/60/60 degrees = 1/240 degree (about 0.0042 degrees). Then the diameter = distance × angular size / 57.3 degrees = 1.4 × 109 km × 1/240 / 57.3 ? 100,000 km.
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A 1.2-kg mass is projected up a rough circular track (radius = 0.80 m) as shown. The speed of the mass at point A is 8.4 m/s, and at point B, it is 5.6 m/s. What is the change in mechanical energy between A and B caused by the force of friction?
a.
?2.7 J
b.
?8.8 J
c.
?4.7 J
d.
?6.7 J
e.
?19 J
The separation between Africa and the Arabian peninsula is a(n) ____________________ valley
Fill in the blank(s) with correct word
Earthquake P-waves
A) travel in straight lines through Earth's core. B) cannot move through Earth's core. C) are transverse vibrations similar to sound waves. D) are longitudinal vibrations similar to sound waves.