3 years ago

The first scientest that proposed that all things are made up of atoms

Physics

1 answer:

just olya [345]3 years ago

5 0

John Dalton I believe.

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If an object moving at 5 m/s accelerates for 30 seconds at a rate of 2

klasskru [66]

Answer:

V=u + at

V= final velocity

U= Initial velocity

a= acceleration

t= time taken

V= 5 + 30*2

V=5+60

V=65m/s

Explanation:

4 0

3 years ago

We cannot consider something to be work unless

Alla [95]

We cannot consider something to be work unless force applied causes movement of an object in the same direction as the applied force.

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4 years ago

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An electron in a one-dimensional box of width L = .75 nm decays from the n = 3 state to the ground state by emitting two photons

Vlad1618 [11]

Answer: 232 nm

Explanation: As it is well known the energy for the one dimentional box is given by:

$E=\frac{h^2}{8mx L^2} *n^2$

where h is the Planck constant, m the electron mass and L the width of the box. n is the energy level

For n=3 we a energy equal :9.62 * 10^-19 J= 6.01 eV

For n=1 the energy is: 1.069 *10^-19 J=0.66 eV

The energy difference Is 5.35 eV so by using this relationship

λ=1240/Energy = 232 nm

7 0

3 years ago

The current in a resistor is 3.0 A, and its power is 60 W. What is the voltage?

kkurt [141]

Answer:

I font now but I think its 2.0 + 78 w -60

8 0

2 years ago

Which of these would have the highest temperature? A. ice B. water C. water vapor

fiasKO [112]

Answer:

Water vapor

Explanation:

because water vapor is gas and gas particles move faster than solid particles (which stick together) and water particles ( with a somewhat normal movement) and the faster the particle, the hotter the substance is. With that being said C is the correct answer.

6 0

3 years ago