If the net force on an object is zero,
a. there must be no forces acting on the object
b. the object must be at rest
c. the object's acceleration must be zero
d. there can be no friction acting on the object
C
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Jupiter is a failed star
Indicate whether the statement is true or false
A particle in a 453 m-long linear particle accelerator is moving at 0.875c. How long does the particle accelerator appear to the particle?
A) 219 m B) 589 m C) 104 m D) 936 m
The figure below shows the orbit of a comet about the sun. If the area swept out by the line from the sun to the comet is equal when traveling from A to B and when traveling from D to E, what can we say about the time it takes
A. the time to travel from A to B is greater than the time from D to E.
B. the time to travel from A to B is the same as the time from D to E.
C. the time to travel from A to B is less than the time from D to E.
According to Kepler’s First Law, all planets have orbits about the Sun that are
A. circles B. squares C. parabolas D. ellipses