3 years ago

How was Bohr's atomic model different from those of previous scientists?

1 answer:

4 0

Answer:Bohr placed the electrons in distinct energy levels. Rutherford described the atom as consisting of a tiny positive mass surrounded by a cloud of negative electrons. Bohr thought that electrons orbited the nucleus in quantised orbits.

Explanation: also rutherfords was just a hypothesis while Bhor took the time to make his an experiment

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You exert 500 N of force down on the earth as you jump into the air. How much force does the earth exert back on you?

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The same 500N, is the Newton’s Third Law.

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3 years ago

If a conductor wire gets heated. What happens with its resistance?

yawa3891 [41]

If a conductor wire is heated, its resistance decreases and conductivity increases.

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3 years ago

_____ of rough surfaces reduces friction

Radda [10]

Answer:

Hey shaikaadil700 !

Lubricating  of rough surfaces reduces friction.

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2 years ago

A circuit is made of a battery, a light bulb, and a 2 resistor. The battery has a voltage of 3 volts. When connected, the ammete

Monica [59]

Answer:

3ohms

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From Ohm's Law

V = IR

V is that voltage = 3volts

I = current = 1amp

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Putting those values into the above formula.

3volts = 1amp×R

Making R the subject

R = 3/1

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The resistance of the light bulb is 3ohms.

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3 years ago

A 20 ft ladder leans against a wall. The bottom of the ladder is 3 ft from the wall at time t=0 and slides away from the wall at

stellarik [79]

Answer: 0.516 ft/s

Explanation:

Given

Length of ladder L=20 ft

The speed at which the ladder moving away is v=2 ft/s

after 1 sec, the ladder is 5 ft away from the wall

So, the other end of the ladder is at

$\Rightarrow y=\sqrt{20^2-5^2}=19.36\ ft$

Also, at any instant t

$\Rightarrow l^2=x^2+y^2$

differentiate w.r.t.

$\Rightarrow 0=2xv+2yv_y\\\\\Rightarrow v_y=-\dfrac{x}{y}\times v\\\\\Rightarrow v_y=-\dfrac{5}{19.36}\times 2=0.516\ ft/s$

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3 years ago