________ is a measure of the internal energy that has been absorbed or transferred from one body to another, often due to a diff
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a)
b) 1.96 N
c) 1.96 N
Explanation:
a)
To find the acceleration of the box, we apply Newton's second law of motion:
where
is the net force on the box
m is the mass of the box
a is its acceleration
Here we have to consider the horizontal direction, which is the one in which the box is moving. The net force is given by:
which is the difference between the forward force and the resistive force. Then we have
m = 0.200 kg (mass of the box)
Therefore, the acceleration of the box is:
b)
The gravitational force (also called weight) is the force with which an object is pulled by the Earth towards the Earth's centre.
It is given by
where
m is the mass of the object
g is the acceleration due to gravity
In this problem, we have:
m = 0.200 kg is the mass of the box
is the acceleration due to gravity
Therefore, the gravitational force on the box is:
c)
The normal force is the force with which a surface pushes back on an object.
For an object lying on a flat surface, there are two forces acting along the vertical direction:
- The gravitational force, , which pushes the object downward
- The normal force, N, which pushes the object upward
As the object is at rest, the vertical acceleration of the object is zero, therefore according to Newton's second law of motion, the net force must be zero:
Which means that the normal force is equal to the gravitational force:
And so, for the box in this problem, the normal force is
A. a large amount of energy released into its surrounding
During the respiration, glucose molecules are converted to other molecules in a series of steps. They finally end up as as carbon-dioxide and water.
The overall reaction is
<span>C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + 2805 kJ
</span>
The reaction is exothermic reaction because <span>C=O and O-H bonds in the products are so much more stable than the bonds in the reactants.
</span>
Bond energy is the average needed to break a bond.
Some bond energies are:
C-C = 347 kJ/mol
C-H = 413kJ/mol;
C-O = 358 kJ/mol;
O-H = 467 kJ/mol;
O=O = 495 kJ/mol;
<span>C=O = 799 kJ/mol</span>
During the respiration, glucose molecules are converted to other molecules in a series of steps. They finally end up as as carbon-dioxide and water.
The overall reaction is
<span>C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + 2805 kJ
</span>
The reaction is exothermic reaction because <span>C=O and O-H bonds in the products are so much more stable than the bonds in the reactants.
</span>
Bond energy is the average needed to break a bond.
Some bond energies are:
C-C = 347 kJ/mol
C-H = 413kJ/mol;
C-O = 358 kJ/mol;
O-H = 467 kJ/mol;
O=O = 495 kJ/mol;
<span>C=O = 799 kJ/mol</span>