A rock is thrown downward from an unknown height above the ground with an initial speed of 10 m/s. It strikes the ground 3.0 s later. Determine the initial height of the rock above the ground
a. 44 m
b. 14 m
c. 74 m
d. 30 m
e. 60 m
c
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The International Space Station is orbiting at an altitude of about 370 km above the earth's surface. The mass of the earth is 5.976 × 1024 kg and the radius of the earth is 6.378 × 106 m
(a) Assuming a circular orbit, what is the period of the International Space Station's orbit? (b) Assuming a circular orbit, what is the speed of the International Space Station in its orbit?
One method of strengthening the ceramic Si3N4 is by producing a(n) _________microstructure.
Fill in the blank(s) with the appropriate word(s).
Jennifer is inside her windowless space station laboratory and finds herself increasingly pulled to the floor. What experiment can she perform inside the lab to decide if she is feeling the effect of an acceleration or an effect of gravity?
What will be an ideal response?
Which have the longest wavelengths when traveling in a vacuum?
A) radio waves B) light C) X-rays D) all the same