Answer:
See explanation below
Explanation:
Recall that Weight is a Force that results from the action of a gravitational field on our body mass. Therefore if one changes locations to places where the acceleration of gravity is different, our weight can change although the mass of our body stays the same.
For example, going to a high mountain, where the acceleration of gravity is a little smaller than at sea level, will produce such change. Also, going to another planet with different gravitational field, or going to the Moon (where the acceleration of gravity is about 1/6 of that on Earth which therefore will reduce our weight without reducing our mass)
Answer:
A. Force on parent is greater than the force on child
B. The net force acting on the bodies is zero for each.
C. the drag force on the parent is greater than the drag force on the child.
Explanation:
The child and the parent jump together form a certain height where the mass of the parent is greater than the mass of the child.
A
Before opening the parachute the drag force is negligible and so their velocity and acceleration are same simultaneously. The total force acting on the child is lesser than the total force of gravity on the child because the force of gravity is given as:
where:
m= mass
g= acceleration due to gravity
So when the mass is greater then the force of gravity is also greater on the body.
B
During the uniform velocity motion there is no acceleration in the body and hence we can say the there is no net force acting on the body.
The net force acting on the body is zero.
C
The force of drag acts due to parachute on each of the body when falling with uniform motion, this drag force is equal to the force of gravity acting on each of them individually.
So the drag force on the heavier body is greater than the drag force on the lighter body. During this condition the bodies fall with a uniform velocity called terminal velocity.
where:
density of the air
A= area normal to the direction of fall
v= terminal velocity
coefficient of drag
Answer:
There are atoms when the sample of cerium is 20 seconds old.
Explanation:
The decay of isotopes is modelled after the following exponential expression:
(1)
Where:
- Initial number of atoms, dimensionless.
- Current number of atoms, dimensionless.
- Time, measured in seconds.
- Half-time, measured in seconds.
Now we clear the half-time within (1):
If we know that , and , then the half-life of the isotope is:
And the decay equation for the sample is described by:
Lastly, if we get that , then the activity of the sample of cerium is:
There are atoms when the sample of cerium is 20 seconds old.
The answer that would best complete the given sentence above is cubic meter. The standard unit for measuring volume is the cubic meter (m^3). Volume is the quantity or the measurement of the amount of space that can be or is being occupied by matter. The metric unit for volume includes "liters" and "milliliters".
We don't really understand what "ball really is life" means, but
judging by the overall group of questions you posted today, one
can be pretty sure that this one is equally meaningless.
Soap bubbles and balloons are also spheres, but have no influence
on the nature of life.