An object in motion tends to remain in motion
A) because of a force within the object.
B) only when an external force acts on it.
C) without the need of a force.
D) due to its nature.
Answer: C
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The observed slowing down of time predicted by Einstein's Special Theory of Relativity for an object traveling close to the speed of light is referred to as
A) time dilation B) time expansion C) a time warp D) time contraction
The instability strip is above the main sequence on the H-R diagram
Indicate whether the statement is true or false
Why might sodium carbonate (washing soda, Na2CO3) be added to hard water to aid in cleaning?
A) The hard ions in the water are more attracted to the carbonate ions -2 charge. B) The hard ions are dissolved by the added sodium ions. C) The soap gets softer due to the added ions. D) The ions solubilize the soap due to ion-ion intermolecular attraction, which improves the cleaning ability. E) none of the above
A horizontal disk with a radius of 10 cm rotates about a vertical axis through its center. The disk starts from rest at t = 0 and has a constant angular acceleration of 2.1 rad/s2 . At what value of t will the radial and tangential components of the linear acceleration of a point on the rim of the disk be equal in magnitude?
a. 0.55 s b. 0.63 s c. 0.69 s d. 0.59 s e. 0.47 s