Answers: (1) a. weight, (2)b. Force changes by 2/9, (3)b. movement, (4)a. 40,000 Joules, (5)c. the soil will be 5°C.
<h2>Answer 1: a. weight</h2>
Mass and weight are very different concepts.
Mass is the amount of matter that exists in a body, which only depends on the quantity and type of particles within it. This means mass is an intrinsic property of each body and remains the same regardless of where the body is located.
On the other hand, weight is a measure of the gravitational force acting on an object and is directly proportional to the product of the mass of the body by the acceleration of gravity
:
Then, since the Earth and the Moon have different values of gravity, t<u>he weight of an object in each place will vary</u>, but its mass will not.
<h2>Answer 2: b. Force changes by 2/9</h2>
According to the law of universal gravitation, which is a classical physical law that describes the gravitational interaction between different bodies with mass:
(1)
Where:
is the module of the force exerted between both bodies
is the universal gravitation constant
and
are the masses of both bodies.
is the distance between both bodies
If we double the mass of one object (for example ) and triple the distance between both (for example
). The equation (1) will be rewritten as:
(2)
(3)
If we compare (1) and (2) we will be able to see the force changes by 2/9.
<h2>Answer 3: b. movement</h2>
The Work done by a Force
refers to the release of potential energy from a body that is <u>moved</u> by the application of that force to overcome a resistance along a path.
When the applied force is constant and <u>the direction of the force and the direction of the movement are parallel,</u> the equation to calculate it is:
Now, <u>when they are not parallel, both directions form an angle</u>, let's call it . In that case the expression to calculate the Work is:
Therefore, pushing on a rock accomplishes no work unless there is movement (independently of the fact that movement is parallel to the applied force or not).
<h2>Answer 4: a. 40,000 Joules</h2>The Kinetic Energy is given by:
(4)
Where is the mass of the body and
its velocity
For the first case (kinetic energy for a car at
):
(5)
Finding :
(6)
(7)
(8)
For the second case (unknown kinetic energy for a car with the same mass at
):
(9)
(10)
(11)
<h2>Answer 5: c. the soil will be 5°C</h2>
The formula to calculate the amount of calories is:
(12)
Where:
is the mass
is the specific heat of the element. For water is
and for soil is
is the variation in temperature (the amount we want to find for both elements)
This means we have to clear from (12)
:
(13)
For Water:
(14)
(15)
(16)
For Soil:
(17)
(18)
(19)
Hence the correct option is c.
