What contributions were made by J. J. Thomson? the measurement of the electron's charge the discovry the electron and measurinf

of its charge-to-mass ratio the revealation that the mass of an atom is concentrated in a small region called a nucleus

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2. Turn off the Parallel line and turn on the Line through focal point. Move the light bulb around. What do you notice about the

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Answer:

The convergence of light rays redirects them toward the focal point, resulting in a magnifying effect.

Explanation:

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An astronaut stands by the rim of a crater on the Moon, where the acceleration of gravity is 1.62 m/s2 and there is no air. To d

Keith_Richards [3271]

Answer:

12.1 seconds

Explanation:

t = time duration

u = initial speed

v = final speed = 0

s = distance = 120 m

a = lunar gravity acceleration = 1.67 m/s²

Motion equation

$v^2-u^2=2as\\\Rightarrow -u^2=2as-v^2\\\Rightarrow -u^2=2\times -1.67\times 120-0^2\\\Rightarrow u=\sqrt{2\times 1.67\times 120}\\\Rightarrow u=20.02\ m/s$

$v=u+at\\\Rightarrow t=\frac{v-u}{a}\\\Rightarrow t=\frac{0-20.2}{-1.67}\\\Rightarrow t=12.1\ s$

The rock takes 12.1 seconds to reach the bottom of the crater.

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