You push an object, initially at rest, across a frictionless floor with a constant force for a time interval, ?t, which results in a final speed of v for the object. You repeat the experiment, but with a force that is half as large. What time interval is now required to reach the same final speed?
1. 4?t
2. ?t
3. ?t/2
4. 2?t
4
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Star A and star B both have an apparent magnitude of 4.0, but star A has an absolute magnitude of 1.0 and star B has an absolute magnitude of 7.0. Which statement below is correct?
A) Star A appears brighter than star B, but actually star B and star A are the same brightness. B) Star B appears brighter than star A, but actually star B and star A are the same brightness. C) Star A and star B appear to have the same brightness, but actually star B is brighter than star A. D) Star A and star B appear to have the same brightness, but actually star A is brighter than star B. E) It is impossible to determine how bright these stars are or appear to be relative to one another, given the information above.
What is the fundamental reason that Mars, unlike Earth, has become virtually geologically dead?
A) its small size compared to Earth B) its large size compared to Earth C) its farther distance than Earth to the Sun D) its closer distance than Earth to the Sun E) its rapid rotation compared to Earth F) its slow rotation compared to Earth
Propped cantilever beam AB has moment M1 applied at joint B. Framework ABC has moment M2 applied at C. Both structures have con-stant flexural rigidity EI. If the ratio of the applied moments M1/M2 5 3/2, the ratio of the reactive moments MA1/MA2 at clamped support A is approximately:
(A) 1
(B) 3/2
(C) 2
(D) 5/2
About how old is Earth?
a. 6000 years b. 1 million years c. 1 billion years d. 5 billion years e. 14 billion years