The figure below shows a planet traveling in a counterclockwise direction on an elliptical path around a star located at one focus of the ellipse. When the planet is at point A,
a.
its speed is decreasing.
b.
its angular momentum is increasing.
c.
the gravitational force does no work on the planet.
d.
all of the above are correct.
e.
none of the above is correct.
e
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The binding energy of a molecule
A) is the negative of the activation energy. B) cannot be negative if a molecule is formed. C) must be negative if a molecule is formed. D) can be negative if a molecule is formed. E) must be positive if the molecule is formed.
If the source moves away from you, and at the same time you run away from the source, the frequency you hear is the same as f
Indicate whether the statement is true or false
The velocity needed to stay in a round orbit is called the__________
A) circular velocity B) linear velocity C) vertical velocity D) horizontal velocity
Three 5.0-kg masses are located at points in the xy plane, as shown. What is the magnitude of the resultant force (caused by the other two masses) on the mass at x = 0, y = 0.30 m?
A. 2.6 × 10?8 N B. 2.0 × 10?8 N C. 2.9 × 10?8 N D. 2.3 × 10?8 N E. 2.1 × 10?8 N