A 4.2-kg object, initially at rest, "explodes" into three objects of equal mass. Two of these are determined to have velocities of equal magnitudes (5.0 m/s) with directions that differ by 90°. How much kinetic energy was released in the explosion?
a. 70 J
b. 53 J
c. 60 J
d. 64 J
e. 35 J
A
You might also like to view...
An example of a convective cloud is the
A) nimbostratus. B) cumulus. C) cirrocumulus. D) altostratus.
If the Sun's core suddenly shrank a little bit, what would happen in the Sun?
A) The core would heat up, fusion rates would increase, the core would re-expand. B) The core would cool off and continue to shrink as its density increased. C) The density of the core would decrease, causing the core to cool off and expand. D) The core would heat up, causing it to radiate so much energy that it would shrink even more.
How did Ptolemy explain the retrograde motion of Venus?
What will be an ideal response?
If the objective lens of a compound microscope is replaced with a lens of double the focal length while the eyepiece also has its focal length halved, what will happen to the overall magnification of the microscope?
a. This will result in no change in the magnification. b. The magnification quadruples. c. The magnification doubles. d. The magnification decreases.