3 years ago

Trial.

Physics

1 answer:

olga nikolaevna [1]3 years ago

4 0

Answer:

Explanation:

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What tool should a scientist use to measure an object in milligrams

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The weight of an object is the same on two different planets. The mass of planet A is only sixty percent that of planet B. Find

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Answer:

0.775

Explanation:

The weight of an object on a planet is equal to the gravitational force exerted by the planet on the object:

$F=G\frac{Mm}{R^2}$

where

G is the gravitational constant

M is the mass of the planet

m is the mass of the object

R is the radius of the planet

For planet A, the weight of the object is

$F_A=G\frac{M_Am}{R_A^2}$

For planet B,

$F_B=G\frac{M_Bm}{R_B^2}$

We also know that the weight of the object on the two planets is the same, so

$F_A = F_B$

So we can write

$G\frac{M_Am}{R_A^2} = G\frac{M_Bm}{R_B^2}$

We also know that the mass of planet A is only sixty percent that of planet B, so

$M_A = 0.60 M_B$

Substituting,

$G\frac{0.60 M_Bm}{R_A^2} = G\frac{M_Bm}{R_B^2}$

Now we can elimanate G, MB and m from the equation, and we get

$\frac{0.60}{R_A^2}=\frac{1}{R_B^2}$

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The de Broglie wavelength of a 0.064-kg golf ball is 3.09 x 10^−34m. What is its speed? (h = 6.63 x 10^−34 J⋅s)

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Answer:

The speed is 33.5 m/s.

Explanation:

Given that,

Mass = 0.064 kg

Wavelength $\lambda= 3.09\times10^{-34}\ m$

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Using formula of he de Broglie wavelength

$\lambda=\dfrac{h}{mv}$

$v=\dfrac{h}{m\lambda}$

Where, h = Planck constant

m = mass

$\lambda$ = wavelength

Put the value into the formula

$v = \dfrac{6.63\times10^{-34}}{0.064\times 3.09\times10^{-34}}$

$v=33.5\ m/s$

Hence, The speed is 33.5 m/s.

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