A. The amount of work increases.
Imagine you are pushing a box on a flat surface. Now imagine pushing it up a steep hill. It gets harder and that's how I remember this.
Hope this helps.
B. picking up a box off the floor
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Below is the solution:
<span>centripetal accel = 1.5*g
ω²r = 1.5*9.8m/s²
ω² * 8m = 14.7 m/s²
ω = 1.36 rad/s * 1rev/2πrads * 60s/min = 12.9 rpm</span>
DO YOU HAVE THE ENGLISH TRANSLATION?
The speed of an electromagnetic wave is determined by the electrical properties of whatever 'medium' it happens to be traveling through.
