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3 years ago

How high up is a 3 kg object that has 300 joules of energy

Physics

2 answers:

BaLLatris [955]3 years ago

6 0

You use the Work Formula
W=F*d
or W=mgh
So W = 300 J
m= 3kg
g = 9.8
an d you have to find h
so 300 = 3*9.8*h
h=10.2m

kvasek [131]3 years ago

5 0

Answer:

Height, h = 10.20 meters

Explanation:

It is given that,

Mass of the object, m = 3 kg

Energy of object, E = 300 J

Let it will moved to a height of h. The energy possessed by it is called gravitational potential energy. It is given by :

$E=mgh$

$h=\dfrac{E}{mg}$

$h=\dfrac{300\ J}{3\ kg\times 9.8\ m/s^2}$

h = 10.20 meters

So, the object will move to height of 10.20 meters. Hence, this is the required solution.

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An electron and a proton each have a thermal kinetic energy of 3kBT/2. Calculate the de Broglie wavelength of each particle at a

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Answer:

Given:

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$\lambda_{e} = \frac{h}{p_{e}}$

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$v_{e}$ = velocity of an electron

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Using eqn (2) in (1):

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$\lambda_{p} = \frac{h}{p_{p}}$

$\lambda_{p} = \frac{h}{m_{p}{v_{p}}$ (3)

where

$m_{p} = 1.6726\times 10_{- 27} kg$ = mass of proton

$v_{p}$ = velocity of an proton

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Kinetic energy of a proton = thermal kinetic energy

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$v_{p} = 6.674\times 10^{3} m/s$ (4)

Using eqn (4) in (3):

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3 years ago

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san4es73 [151]

Answer:

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