Answer:
#See solution for details
Explanation:
a. Action: Earth pulls on the Moon, reaction: Moon pulls on Earth;
b. Action: foot applies force to ball, reaction: ball applies force to foot;
c. Action: rocket pushes on gas, reaction: gas pushes back on rocket;
d. Action: car tires push backward on road, reaction: road pushes forward on tires;
e. Action: jumper pushes down on ground, reaction: ground pushes up on jumper;
f. Action: gun pushes forward on bullet, reaction: bullet pushes backward on gun
Many devices have been invented to accurately measure temperature. It all started with the establishment of a temperature scale. This scale transformed the measurement of temperature into meaningful numbers.
In the early years of the eighteenth century, Gabriel Fahrenheit (1686-1736) created the Fahrenheit scale. He set the freezing point of water at 32 degrees and the boiling point at 212 degrees. These two points formed the anchors for his scale.
Later in that century, around 1743, Anders Celsius (1701-1744) invented the Celsius scale. Using the same anchor points, he determined the freezing temperature for water to be 0 degree and the boiling temperature 100 degrees. The Celsius scale is known as a Universal System Unit. It is used throughout science and in most countries.
There is a limit to how cold something can be. The Kelvin scale is designed to go to zero at this minimum temperature. The relationships between the different temperature scales are:
oK = 273.15 + oC oC = (5/9)*(oF-32) oF = (9/5)*oC+32
oF oC oK
Water boils 212 100 373
Room Temperature 72 23 296
Water Freezes 32 0 273
Absolute Zero -460 -273 0
At a temperature of Absolute Zero there is no motion and no heat. Absolute zero is where all atomic and molecular motion stops and is the lowest temperature possible. Absolute Zero occurs at 0 degrees Kelvin or -273.15 degrees Celsius or at -460 degrees Fahrenheit. All objects emit thermal energy or heat unless they have a temperature of absolute zero.
If we want to understand what temperature means on the molecular level, we should remember that temperature is the average energy of the molecules that composes a substance. The atoms and molecules in a substance do not always travel at the same speed. This means that there is a range of energy (the energy of motion) among the molecules. In a gas, for example, the molecules are traveling in random directions at a variety of speeds - some are fast and some are slow. Sometimes these molecules collide with each other. When this happens the higher speed molecule transfers some of its energy to the slower molecule causing the slower molecule to speed up and the faster molecule to slow down. If more energy is put into the system, the average speed of the molecules will increase and more thermal energy or heat will be produced. So, higher temperatures mean a substance has higher average molecular motion. We do not feel or detect a bunch of different temperatures for each molecule which has a different speed. What we measure as the temperature is always related to the average speed of the molecules in a system
Period = (1) / (frequency)
Period = (1) / (200 per second) = 0.005 second = 5 milliseconds
Answer:
a) Directamente proporcional
Explanation:
El peso se puede definir como la fuerza que actúa sobre un cuerpo o un objeto como resultado de la gravedad.
Matemáticamente, el peso de un objeto viene dado por la fórmula;
Donde;
m es la masa del objeto.
g es la aceleración debida a la gravedad.
De la expresión matemática, podemos deducir que el valor del peso de un objeto es directamente proporcional a la masa del objeto.
Por lo tanto, un aumento en la masa de un objeto provocaría un aumento en el peso del objeto y viceversa.
Answer:
T = 184 seconds
Explanation:
First in order to solve this, we need to know which is the expression to calculate the period. This is an exercise of angular velocity, so:
T = 2π/w
Where w: angular speed (in rad/s)
So, let's calculate first the innitial angular speed:
w = 2π/T
Converting days to seconds:
25.4 days * 24 h/day * 3600 s/h = 2,194,560 s
Then the angular speed:
w = 2π / 2,194,560 = 2.863x10^-6 rad/s
Now, the innitial angular momentum is:
I = (2/5)Mr² replacing data:
I = 2/5* (6.96x10^8)² * M = 1.94x10^17m² * M
so the initial angular momentum would be:
L = Iω = 2.863x10^-6 * 1.94x10^17 M
L = 5.55x10^11 m²/s * M = final angular momentum
Now the final I = 2/5Mr²
Final I = 2/5 * (6.37x10^6)² * M = 1.62x10^13m² * M
Then 5.55x10^11m²/s * M = 1.62x10^13m² * M * ω → M cancels
ω = 3.42x10^-2 rad/s
Then the new period
T = 2π/ω = 2*3.14 / 3.42x10^-2
T = 184 seconds
