The epoxy flywheel is still under development by commercial interests
What will be an ideal response?
Many advances have been made in flywheel technology, but more are needed.
Commercial firms do recognize the promise and opportunity.
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Imagine for a minute that the Moon is held in its orbit about the Earth by electrical forces rather than by gravitation. What electrical charges ?Q on the Earth and +Q on the Moon are necessary to hold the Moon in a circular orbit with a period of 27.3 days? The Earth-Moon distance is 384 000 km and the mass of the Moon is 7.35 × 10^22 kg
The efficiency of a Carnot engine is 35.0%. What is the temperature of the cold reservoir if the temperature of the hot reservoir is 500 K?
A) 95.0 K B) 175 K C) 325 K D) 269 K E) 231 K
A hollow circular post ABC (see figure) supports a load P1 = 16 kN acting at the top. A second load P2 is uniformly distributed around the cap plate at B. The diameters and thicknesses of the upper and lower parts of the post are dAB = 30 mm, tAB = 12 mm, dBC = 60 mm, and tBC = 9 mm, respectively. The lower part of the post must have the same compressive stress as the upper part. The required magnitude of the load P2 is approximately:
(A) 18 kN
(B) 22 kN
(C) 28 kN
(D) 46 kN
A type B star is bluer than a type G star
Indicate whether the statement is true or false