The supporting force exerted by a fluid on an object immersed in it is called ______.
2 answers:
Answer:
buoyant force
Explanation:
The buoyant force is the pressure that is exerted on a immersed object by the surrounding fluid.
The buoyant force acts on the surface of the solid object even if the object is immersed in the fluid partially or completely. If the object is immersed in a fluid, the net force is given by the formula:
where Patm is the atmospheric pressure at the top of the object
pgh = pressure of the part in the fluid
F(bottom) is the upward force on the object
The net force is the same as the wight of the displaced object.
The principle is known as the Archimedes principle as the buoyant force is equals the weight of the fluid displaced by the object.
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1) First of all, let's calculate the potential difference between the initial point (infinite) and the final point (d=0.529x10-10 m) of the electron.
This is given by:
Where E is the electric field generated by the proton, which is
where
is the Coulomb constant and 
is the proton charge.
Replacing the electric field formula inside the integral, we obtain
2) Then, we can calculate the work done by the electric field to move the electron (charge
) through this 
. The work is given by
This is given by:
Where E is the electric field generated by the proton, which is
where
Replacing the electric field formula inside the integral, we obtain
2) Then, we can calculate the work done by the electric field to move the electron (charge
Answer:
B) The car at point C has less kinetic energy than the car at point B.
Explanation:
We have two types of energy involved in this situation:
- Gravitational potential energy: this is the energy related to the heigth of the car, and it is given by , where m is the mass of the car, g is the gravitational acceleration, and h is the heigth of the car. The potential energy is higher when the car is located higher above the ground.
- Kinetic energy: this is the energy due to the motion of the car, and it is given by , where m is the mass of the car and v is its speed. The kinetic energy is higher when the speed of the car is higher.
- The law of conservation of energy states that the total mechanical energy of the car (sum of potential energy and kinetic energy: ) is constant). This implies that when the car is at a higher point, the kinetic energy is less (because U is larger, so K must be smaller), while when the car is at a lower point, the kinetic energy is larger.
- Based on what we have written so far, we can conclude that the correct statement is:
B) The car at point C has less kinetic energy than the car at point B.
Because the car at point C is located at a higher point than point B, so the car at point C has larger potential energy than at point B, which implies that car at point C has less kinetic energy than the car at point B.
Weight of the object is given as
so weight of the object will be maximum where gravity(g) will be maximum
so here out of all given four the gravity "g" will be maximum at the surface of SUN as we know that sun will be of maximum mass out of all four planets
as we know that
so correct answer will be
3. SUN