Give an example in which thermal energy might be converted to gravitational energy
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A hot air balloon rises: as we heat the gas in a balloon, the internal pressure increases and the balloon expands. Therefore the density of the air inside decreases and when the average density of the entire balloon (balloon material plus basket plus air inside) becomes less than the density of air outside, the balloon rises, gaining gravitational energy.
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If a dense 20.0-kg object is falling in air at half its terminal velocity, what is the drag force on the object at this moment?
a. 24.5 N b. 49.0 N c. 69.3 N d. 98.0 N e. 139 N
Let's say that the magnitude of a particle's displacement is 2 m. Which of the following values could represent the distance traveled?
(i) 0 m (ii) 1 m (iii) 2 m (iv) 3 m
1.(iii) and (iv) 2.(ii), (iii), and (iv) 3.(i) and (ii) 4.all of themAccording to the Zeeman effect, the splitting of a sunspot's spectral lines is due to:
A) their rapid rotation. B) temperature variations. C) their magnetic fields. D) their radial velocity. E) a Doppler shift.
The index of refraction for a certain material is 1.399 for red light and 1.432 for blue light. Find the angle separating the two refracted colors if the: (a) angle of incidence is 30°. (b) angle of incidence is 60°
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