All organisms need energy to function. Which cell organelle provides this energy
1 answer:
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First of all, an alpha particle consists of two protons and two neutrons (similar to a Helium atom). When an atom emits an alpha particle, its nucleus loses two protons and two neutrons. And its total mass decreases by 4 atomic mass units.(As mass of a proton or a neutron is 1 amu)
There are two kinds of beta emissions (or particles) positron or electron.
When an atom emits a
(positron) particle, actually one if its protons releases the particle. Since a positron's charge is positive, when the atom releases a positron it loses its positive charge and turns into a neutron.
When an atom emits a
(electron) particle, one of its neutrons releases a (electron). And since an electron's charge is negative (-) the neutron loses its negative charge (since neutron's electrical charge is neutral) and turns into a proton.
This is simply explained ^
There are some other details but this should be enough :)
There are two kinds of beta emissions (or particles) positron or electron.
When an atom emits a
When an atom emits a
This is simply explained ^
There are some other details but this should be enough :)
Answer:
The kinetic coefficient of friction between the box and the floor is 1.020.
Explanation:
Let suppose that box is on horizontal ground. According to the Newton's Laws, an object has a net acceleration of zero when either is at rest or moves at constant velocity. Friction is a reaction to the external force that moves the box. Hence, the equation of equilibrium for the 20-Kg box is:
(Eq. 1)
Where:
- External force, measured in newtons.
- Friction force, measured in newtons.
If we know that , then the magnitude of the kinetic friction force is:
In addition, friction force is represented by the following formula:
(Eq. 2)
Where:
- Kinetic coefficient of friction, dimensionless.
- Mass, measured in kilograms.
- Gravitational acceleration, measured in meters per square second.
Now we clear the kinetic coefficient of friction:
If we know that ,
and
, then the kinetic coefficient of friction is:
The kinetic coefficient of friction between the box and the floor is 1.020.