The energy carried by the incident light is
where h is the Planck constant and f is the frequency of the light. The threshold frequency is the frequency that corresponds to the minimum energy needed to eject the electrons from the metal, so if we substitute the threshold frequency in the formula, we get the minimum energy the light must have to eject the electrons:
Answer:
A satellite goes into orbit by getting a ride with a rocket or the Space Shuttle. Gravitational pull and the velocity of the satellite help it remain in orbit.
Explanation:
Answer:
y ≠ 0
Explanation:
The plot is asymptotic to the x and y axes in the first and third quadrants
The ball rolls off the table with speed <em>v</em> from a height of 0.35 m, so that it covers a horizontal distance <em>x</em> with height <em>y</em> at time <em>t</em> of
<em>x</em> = <em>v t</em>
<em>y</em> = 0.35 m - 1/2 <em>g t</em> ²
where <em>g</em> = 9.80 m/s² is the magnitude of the acceleration due to gravity.
Solve for <em>t</em> when <em>y</em> = 0, i.e. the time it takes for the ball to reach the ground:
0 = 0.35 m - 1/2 <em>g</em> <em>t</em> ²
<em>t</em> ² = (0.70 m) / <em>g</em>
<em>t</em> ≈ 0.267 s
Now solve for <em>v</em> given that the ball falls 3 m away from the table:
3 m = <em>v</em> (0.27 s)
<em>v</em> = (3 m) / (0.27 s)
<em>v</em> ≈ 11.2 m/s