An object is moving in a circular path with a radius of 5.00 m. If the object moves through an angle of 270 degrees, then the tangential distance traveled by the object is
A. 4.71 m.
B. 15.2 m.
C. 23.6 m.
D. 40.2 m.
C. 23.6 m.
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Every equation in physics reminds us of a lesson: we can never change only one thing. When we change the composition of the atmosphere we likely also change
A) its transparency. B) its reflectivity. C) its average temperature. D) Earth's climate. E) all of the above
During various stages of evolution, low mass stars (like the Sun) differ significantly from high mass stars. How do they differ in terms of observational properties while Main Sequence stars?
What will be an ideal response?
The text states that luminous matter in the Milky Way seems to be much like the tip of an iceberg. This refers to the idea that ________
A) black holes are much more interesting than ordinary stars that give off light B) luminous matter emits white light, much like the light reflected from icebergs C) the luminous matter of the Milky Way is essentially floating on the surface of a great sea of dark matter D) dark matter represents much more mass and extends much further from the galactic center than the visible stars of the Milky Way
Two experiments are performed. In (A), an 18.0 N force pushes horizontally on a 2.00 kg block that then pushes on a 4.00 kg block. In (B), an 18.0 N force pushes on a 4.00 kg block that then pushes on a 2.00 kg block. Which statement is correct?
a. The acceleration is 3.00 m/s2 in both (A) and (B). b. The acceleration is 4.50 m/s2 in both (A) and (B). c. The acceleration is 6.00 m/s2 in both (A) and (B). d. The acceleration is 9.00 m/s2 in both (A) and (B). e. The 2.00 kg block has a 9.00 m/s2 acceleration. The 4.00 kg block has a 4.50 m/s2 acceleration.