What happens when a ray of light is directed at a mirror, a glass block and a prism?
Refrigerator
Counter
CO
The kitten's gravitational potential energy on top of the refrigerator is greater, but what is the kitten's gravitational
potential energy on top of the counter? Assume gravity as 10, if needed.
Answer:
E = 27 J
Explanation:
It is given that,
Mass of a kitten is 1.5 kg
Initially, it was at a height of 1.8 m refrigerator and finally jumps to a 0.9 m height counter.
We need to find the kitten's gravitational potential energy on top of the counter. Potential energy is possessed due to the position of an object. It can be given by :
g is acceleration due to gravity
So, the kitten's gravitational potential energy on top of the counter is 27 J.
30 kg
6,750 N
6,750 kg
Answer:
Explanation:
Explanation:
Three resistors of resistances 2ohm,3ohm, and 6ohm respectively.
Let R1=2Ω
⇒R2=3Ω
⇒R2=6Ω
● A total resistance of 4Ω from three resistors of given resistances. Firstly, connect the two resistors of 3Ω and 6Ω in parallel to get a total resistance of 2Ω which is less than the lowest individual resistance.
●When R 2 and R 3 are connected in parallel with
R1 in series we get
⇒1/R=1/R2+1/R3
⇒1/R=1/3+1/6
⇒1/R=1/2
⇒R=2Ω
●Hence, the total resistance of the circuit is 4Ω.
B) Kepler based his laws of planetary motions off of Newton’s law of gravity.
C) Hardy and Weinberg independently came up with a population equation.
D) Darwin and his grandfather both worked on the ideas of survivability.
Answer: The correct answer is B.
Explanation:
"Cumulative" means that something builds on itself. Like one law is formulated from using the result of the other.
Newton's law of gravity had come after that Kepler's laws was formulated.
The law of gravity is more fundamental than Kepler's laws.
Newton formulated his famous law of gravitation between the earth and the moon and also between the Sun and the planet.
After that Kepler's laws came. He gave the law of orbit in which he said that the planet revolves the Sun in an eliiptical orbit. And the other two laws were also given by him. In this way Kepler's law was formulated by using the law of gravity.
Therefore, Kepler based his laws of planetary motions off of Newton’s law of gravity is the best example to show how scientific knowledge is cumulative.
A Scientific law is a statement that summarizes a pattern found in nature.
Further Explanation:
A fact is a natural observation which remains the same for several repeated testing under the same circumstances. But a fact cannot be considered a law because it could be proven wrong at some point.
A scientific law is also a fact with a wider scope of being true as compared to a fact. An observation is categorised as a scientific law only when it is true in each and every condition and has a larger scope of being true.
A scientific theory is an explanation of a natural phenomenon based on the scientific law by several testing and observations. A scientific theory is not always true and it can change for a phenomenon based on the new evidences found.
A hypothesis is a mere prediction of a situation without any testing and observation. It is simply an idea behind any observation and it is yet to be tested whether it holds true for the condition or not.
Therefore, a scientific law is the one that explains the patterns and observed phenomenon in nature and holds true in every situation.
Learn More:
Answer Details:
Grade: High School
Chapter: Scientific laws and theories
Subject: Physics
Keywords: Statement that summarizes, pattern found in nature, scientific law, scientific theory, fact, hypothesis, wider scope, always true.
A. scientific law is a statement that summarizes a pattern found in nature. It is describes an observed phenomenon and has predictive power: it can describe what will happen given a set of initial conditions. Often, a scientific law may be expressed as a mathematical equation.
B. A fact is an observation that is found to be true by repeated testing. Unlike a scientific law, however, a fact has a level of uncertainty. It is only held true until they are proven false. They are also more specific and localized observations compared to scientific laws which are more general and broad in scope.
C. A scientific theory is an explanation for an observed phenomenon. It attempts to explain in detail why and how an observed phenomenon described by a scientific law happens. It is a hypothesis that has been confirmed through time by repeated testing and validation of the scientific community. However, a theory is not set in stone. When new evidence is found that refutes an existing theory, the theory may be changed or abandoned.
D. A hypothesis is a tentative prediction and explanation about the relationship between two variables – the dependent and independent variables. It is a basic idea and has not been tested yet but will soon be subjected to testing to check whether it holds merit based on the data. Hypotheses may be proven valid or not through testing and experimentation.
Keywords: scientific law, theory, fact, hypothesis