Goal posts at the ends of football fields are padded as a safety measure for players who might run into them. How does thick pad
2 answers:
Explanation :
Goal posts at the ends of football fields are padded as a safety measure for players who might run into them.
This is due to thick padding around the goal post reduce injuries to players. In a physics point of view, this would decrease the force.
According to Newton's second law, F = m a
or
The thick padding increases the time of interaction of the player and the post. As a result, the force will decrease.
Hence, the chances of injury can be reduced.
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Answer:
a)
b)
c)
Explanation:
We use the definition of a electric field produced by a point charge:
<u>a)Electric Field due to the alpha particle:</u>
<u>b)Electric Field due to electron:</u>
<u>c)Electric Force on the alpha particle, on the electron:</u>
The alpha particle and electron feel the same force but with opposite direction:
Answer:
The energies corresponding to each of the allowed orbitals are called energy levels.
Explanation:
A scientist known as Niels Bohr put forward that electrons in an atom covers some permitted orbitals with a specific energy. In other words, the energy of an electron in an atom is not continuous, but 'quantized.' The energies corresponding to each of the allowed orbitals are called energy levels.
data which is expressed in form of following way
here in above expression
= true value
= uncertainty in the value
now the relative uncertainty is given as
now by above formula we can say
a) 2.70 ± 0.05cm
here
True value = 2.70
uncertainty = 0.05
Relative uncertainty = = 0.0185
b) 12.02 ± 0.08cm
here
True value = 12.02
uncertainty = 0.08
Relative uncertainty = = 0.00665