Answer:
In the gold foil experiment, Rutherford fired alpha particles (which are nuclei of helium) at a thing gold foil, and then he observed the angular distribution of the scattered alpha particles beyond the foil.
He made the following observations:
- Most of the alpha particles passed through the foil mostly undeflected
- Some of the alpha particles were instead deflected at very large angles
- A few of the alpha particles were even reflected back to the original direction
According to these observations, he made the following conclusions:
- The vast majority of the space in an atom is empty, as most of the the alpha particles pass undeflected
- The atoms have a central nucleus containing a large positive charge, to explain the large deflections of some alpha particles
- The nucleus of the atom is very tiny and contains most of the mass of the atom, to explain the alpha particles reflected back
This experiment therefore contribute to improve the model of the atom: the previous model was the Thomson model (plum-pudding model), but the experiment proved that this was not the right model, and the experiment lead to a new model, in which the atom is believed to consists of a tiny, positive nucleus surrounded by negatively charged electrons orbiting around the nucleus at a very large distance from it.
<span>Magnifying glasses typically use a value of 0.25 meters, or 250 millimeters, distance. This means that that B is the correct answer and the image will be formed approximately 250 millimeters in front of the lens.</span>
As accurately described by Einstein's theory of relativity, gravity is not necessarily a force, but a consequence of the curvature of space time that is caused by the uneven distribution of mass. But this could also be approximated by Newton's Law of Universal Motion. Gravity is a force acting upon two objects with masses at a certain amount of distance. So, the greater the mass, and the closer the objects are, the greater is the force of gravity. So, if you compare the gravity on Mars compared to Earth at a given distance, compare their masses. The mass of Earth is 5.972 × 10^24 kg while that of Mars is <span>6.39 × 10^23 kg. So, the gravity on Earth is much greater because Earth is heavier.
For the second question, let's base on Newton's Second Law of Motion which states: the force exerted on or by the object, is equal to its mass times acceleration. In equation, F = ma. So, if you want to increase acceleration, the force should be greater, while the mass should be lighter.</span>
Answer:
In a molecule, atoms are bonded together by single, double, or triple bonds. An atom has a nucleus surrounded by electrons.
Explanation:
Answer:
nail will stop after traveling 1000 m
Explanation:
We have given mass m = 50 gram = 0.05 kg
Frictional force which is used to stop the mass F = 62.5 kN
Initial velocity is given u = 50 m/sec
From newton's law force is equal to F = ma, here m is mass and a is acceleration
So 
As finally nail stops so final velocity v = 0 m/sec
From third equation of motion 
So 
s = 1000 m
So nail will stop after traveling 1000 m
