Answer:
acceleration = 1.79 m/s^2
Tension = 6817 N
Explanation:
First let's find Elizabeth's weight:
Her weight is greater than the normal force (N = 450 N), so the elevator is going downwards.
The acceleration of Elizabeth is given by:
Where P is the weight of Elisabeth, N is her normal force, m is her mass and a is the acceleration. Then, we have that:
The tension in the cable is given by:
In this case, we use the total mass, so we have:
Niels Bohr created the Atomic theory by combining Rutherford's description of the nucleus and Planck's theory about quanta.
<h3>What is Bohr's atomic theory?</h3>
This was proposed by Neil Bohr and talks about how electrons move in fixed orbitals and not anywhere in between and was able to explain that each orbit has a fixed energy.
He explained the various activities and processes which were happening inside an atom thereby deducing a picture of atomic structure such as the presence of the subatomic particles in the nucleus and how they are involved in a chemical reaction.
The structure was that of a planetary model in which the negatively charged electrons orbit a small, positively charged nucleus which is similar to the planets.
This is therefore the different processes and ways in which Bohr created his atomic theory.
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Answer:
Messenger RNA (mRNA), molecule in cells that carries codes from the DNA in the nucleus to the sites of protein synthesis in the cytoplasm (the ribosomes). The molecule that would eventually become known as mRNA was first described in 1956 by scientists Elliot Volkin and Lazarus Astrachan.
Explanation:
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Answer:
Line emission.
Explanation:
According to Isaac Newton, he postulated that light consists of little (tiny) particles which typically travels in a straight line and from his experimental investigation he observed that white light comprises of a mixture of colors.
Sir Newton observed that, when light shines on a piece of metal, the metal releases electrons because the energy of the tiny light particles are greater than the binding energy of the electrons residing in the metal. This theory is known as the particle model of light.
A line emission would appear in a spectrum when specific wavelength is being emitted by the source of light.
When a high voltage is applied to a low-pressure gas causing it to glow, it will generate line emission.
For example, if a sample of hydrogen gas at low-pressure undergoes or experiences a high voltage electrical discharge, the isolated hydrogen gas would generate a red light (line emission).
Answer:
18.5 m/s
Explanation:
On a horizontal curve, the frictional force provides the centripetal force that keeps the car in circular motion:
where
is the coefficient of static friction between the tires and the road
m is the mass of the car
g is the gravitational acceleration
v is the speed of the car
r is the radius of the curve
Re-arranging the equation,
And by substituting the data of the problem, we find the speed at which the car begins to skid:
