A 5.0-kg mass sits on the floor of an elevator that has a downward acceleration of 1.0 m/s2. On top of the 5.0-kg mass is an object of unknown mass. The force of the elevator on the 5.0-kg mass is 80 N up. Determine the unknown mass.
A. 3.3 kg
B. 2.4 kg
C. 1.6 kg
D. 4.1 kg
E. 5.0 kg
Answer: D
You might also like to view...
The time derivative of a vector is a:
A. Either a scalar or a vector. B. Tensor. C. Scalar. D. Vector.
According to the consensus among those scientists who have studied the question, what is the scientific status of creationism today?
A) Although there is a lot of evidence against it, creationism is plausible on the basis of the principles of many scientific fields. B) Although it disagrees with the principles of many scientific fields, there is a lot of real scientific evidence for creationism. C) It disagrees with the principles of many scientific fields, and there is a lot of scientific evidence against it. D) Creationism is plausible on the basis of the principles of many scientific fields, and here is also real scientific evidence for it, which is why most scientists believe that creationism has real validity. E) Although creationism is plausible on the basis of the principles of many scientific fields, and although there is also real scientific evidence for it, most scientists still will not accept creationism because it seems too unconventional or "kooky."
Why might the Cassini-Huygens probe to Titan be considered disappointing to exobiologists?
What will be an ideal response?
Explain the following statement: "In any natural process, some energy becomes unavailable to do useful work."
What will be an ideal response?