C. All the kinetic energy must be transformed into electric and heat energy since this is a closed system (the 2nd sentence tells us this). We don't know the fraction of heat to electric energy but all of the kinetic changes into these two types of energy.
Ight Ascension and Declination<span> are a system of coordinates used in astronomy to determine the location of</span>stars<span>, planets and other objects in the night sky. They are </span>similar<span> to the system of </span>longitude<span> and </span>latitude<span>used to locate places on </span>Earth<span>.</span>
Heat is like sound, both are a form of kinetic energy. Molecules vibrate faster when at higher temps. since molecules vibrate faster, sound waves travel quicker <span />
<span>You may have noticed that there
are plants which do not have green leaves. Some plants are green because of a type of
pigment called chlorophyll. Plant cells
contain chloroplast which constitutes the pigment chlorophyll. Chlorophyll
absorbs red light and deep-blue light, hence, the rest of the sunlight spectrum
which is being reflected causes the plant to look green. When light reflects off on leaves into your eyes, the leaves take
in every hue of the rainbow, except for the color green, thus reflected into
your eyes and makes the leaves appear
green.</span>
Answer:
- 5436 J
Explanation:
mass of car, m = 120 kg
radius of loop, r = 12 m
velocity at the bottom (A) = Va = 25 m/s
Velocity at the top(B) = Vb = 8 m/s
Vertical distance from A to B = diameter of loop, h = 2 x 12 = 24 m
by use of Work energy theorem
Work done by all the forces = change in kinetic energy of the body
Work done by the force + Work done by the friction = Kinetic energy at B - kinetic energy at A
- m x g x h + Work done by friction = 0.5 x 120 x (Vb^2 - Va^2)
- 120 x 9.8 x 24 + Work done by friction = 60 x (64 - 625)
- 28224 + Work done by friction = - 33660
Work done by friction = -33660 + 28224 = - 5436 J
