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3 years ago

A ball of mass of 0.5kg is dropped from a height of 2m.

Physics

1 answer:

erastovalidia [21]3 years ago

3 0

Answer:

6.3m/s

Explanation:

Given parameters:

Mass of the ball = 0.5kg

Height = 2m

Unknown:

Velocity when the ball hits the ground = ?

Solution:

Since the potential energy is transformed into kinetic energy;

P.E = K.E

mgh = $\frac{1}{2}$ m v²

cancelling m;

gh = $\frac{1}{2}$ v²

v² = 2gh

v = √2gh

Insert the parameters and solve;

v = √2gh = √ 2 x 9.8 x 2 = 6.3m/s

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2 years ago

A 0.12 g honeybee acquires a charge of +24pC while flying. The earth's electric field near the surface is typically 100 N/C, dow

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Answer:

150000000

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Explanation:

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$F_e=Eq\\\Rightarrow F_e=100\times 24\times 10^{-12}\\\Rightarrow F_e=2.4\times 10^{-9}\ N$

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The ratio is $\dfrac{F_e}{F_g}=0.00000203873598369$

Balancing the forces we get

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Answer:

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Energy of a photon is given by

$E=h\nu\\\Rightarrow E=h\dfrac{c}{\lambda}$

Let $\lambda_1$ = 700 nm

$\lambda_2=350\\\Rightarrow \lambda_2=\dfrac{\lambda_1}{2}$

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$E_1=\dfrac{hc}{\lambda_1}$

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Dividing the equations

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