As an object of mass 60 kg approaches the bottom of a ramp, point A, its speed is 20 m/s. It goes up the frictionless plane and turns around at point B. What is the potential energy of this object at point B? Use g = 10 m/s2
A) 0 J
B) 6.0 × 103 J
C) 9 × 103 J
D) 12 × 103 J
E) 18 × 103 J
D
You might also like to view...
Contrast main sequence stars of type B and G
What will be an ideal response?
A fatal flaw with Ptolemy's model is its inability to predict the observed phases of
A) the Sun during an eclipse. B) Mars and Jupiter. C) the Moon in its monthly cycle. D) Jupiter and Saturn. E) Mercury and Venus.
During ?+ decay
A) a neutron is transformed to a proton. B) a proton is transformed to a neutron. C) a neutron is ejected from the nucleus. D) a proton is ejected from the nucleus. E) the number of nucleons decreases.
The half-life of cobalt-60 is 5.3 years, while that of strontium-90 is about 29 years. Suppose you have samples of both isotopes, and that they initially have the same activity (number of decays per second)
What must be true of the numbers of cobalt-60 and strontium-90 nuclei in these samples? A) There are more strontium-90 than cobalt-60 nuclei. B) There are equal numbers of cobalt-60 and strontium-90 nuclei. C) There are more cobalt-60 than strontium-90 nuclei. D) It is not possible to compare numbers of nuclei without knowing the masses of the samples.