Which of the following scientists won a noble prize of pioneering work in the study of the evolution of stars?
2 answers:
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Answer:
0.71 J
Explanation:
320 g = 0.32 kg
According to law of energy conservation, the energy loss to external environment (air, ground) can be credited to the change in mechanical energy of the ball.
As the ball was dropped at H = 2 m above the ground then later reaches its maximum height at h = 1.2m, tts instant speed at those 2 points must be 0. So the kinetic energy at those points are 0 as well. The change in mechanical energy is the change in potential energy.
Let g = 9.81 m/s2
Since 1.8J of 2.51 J is due to work by air resistance, the rest of the energy (2.51 - 1.8 = 0.71 J) is would go to heating in the ground and ball when it bounces.
Answer:
Explanation:
We are given that
Mass of charged tine spheres=m=1 g=
1 kg=1000g
The distance between charged tine spheres=r=2 cm=
1 m=100 cm
Acceleration =
Let q be the charge on each sphere.
The electric force between two charged particle
Using the formula
The force between two charged tiny spheres=
According to Newton's second law , the net force
Hence, the magnitude of charge on each tiny sphere=