You didn’t show the cylinder containing water, so I created one that you can use as a model (see image).
The water level was originally at 37 mL.
Then you added the ball, and it displaced its volume of water.
The new volume reading is 52 mL, so
Volume of ball = volume of displaced water = 52 mL – 37 mL = 15 mL.
Lowering a 21g ball with a volume of 15 cm³ into water in a cylinder raises the water level due to the displaced water volume, illustrating Archimedes' principle.
When a ball is lowered into a cylinder of water, it displaces water equal to its own volume, based on Archimedes' principle. The principle states that the buoyant force acting on an object in a fluid is equal to the weight of the fluid displaced by the object.
In this scenario, a ball with a mass of 21g and a volume of 15 cm³ is immersed in the water-filled cylinder. Initially, the water level in the cylinder is at a certain height. As the ball is lowered into the water, it displaces an amount of water equal to its own volume, causing the water level in the cylinder to rise.
The sketch on the right would depict the ball submerged in the water, and the new water level higher than the initial level. The increased water level is a result of the volume of water displaced by the submerged ball.
This phenomenon is essential in understanding buoyancy and the principle behind why objects float or sink in fluids. The upward force exerted by the water (buoyant force) counteracts the weight of the submerged object, leading to changes in water levels.
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Answer:
See below.
Explanation:
The mass of octane in the sample of gasoline is 0.02851 * 482.6 = 13.759 g of octane.
The balanced equation is:
2C8H18(l) + 25O2(g) ----> 16CO2(g) + 18H2O(g)
From the equation, using atomic masses:
228.29 g of octane forms 704 g of CO2 and 324.3 g of H2O
So the mass of CO2 formed from the combustion of 13.759 g of octane = (704 * 13.759) / 228.29
= 42.43 g of CO2.
Amount of water = 324.3 * 13.759) / 228.29
= 19.55 g of H2O.
B) the hypothesis is tested extensively and competing hypothesis are eliminated
C) there are no other competing hypothesis
D) the hypothesis can be tested at least once
2) A preliminary untested explanation that tries to explain how or why things happen in the manner observed is a scientific ________.
A) law
B) theory
C) fact
D) hypothesis
1) The answer is: B) the hypothesis is tested extensively and competing hypothesis are eliminated.
Theory is a tested, unifying explanation for a set of verified facts.
Theory is a system of explanations that ties together a lot of facts.
Steps of the scientific method:
1) ask a question about something that is observed.
2) do background research.
3) construct a hypothesis, an attempt to answer questions with an explanation that can be tested.
4) test of hypothesis.
5) analyze collected data and draw a conclusion.
2) The answer is: D) hypothesis.
Hypothesis is a suggested explanation for an observable phenomenon.
Experimenters may test and reject several hypotheses before solving the problem.
A working hypothesis is provisionally accepted as a basis for further research.
A law in science is a generalized rule to explain a body of observations in the form of a verbal or mathematical statement.
mushrooms and bacteria
B.
diatoms and water molds
C.
mushrooms and yeast
D.
protist and virus
and
Many organisms in Kingdom Fungi grow best in warm, moist conditions. Which of the following is also a characteristic common to organisms in Kingdom Fungi?
A.
reproduce through spores
B.
single celled
C.
survive without oxygen
D.
make nutrients through photosynthesis
B. have luster
C. have low melting points ###
D. are malleable
is my answer right?
B. zinc, gold, aluminium, oxygen.
C. nitrogen, copper, mercury, water.
D. Chlorine, argon, sodium, limestone.
A list that contains only element is option B which include zinc, gold, aluminum, and oxygen.
A chemical element may be defined as a type of simple substance that significantly cannot be broken down or fragmented into smaller parts or changed into another substance.
The basic part of an element is an atom, which contains subatomic particles like protons, neutrons, and electrons. All atoms of an element have the same number of protons. In list A, the air is not an element, in list C, water is not an element, in list D, limestone is not an element. While list B includes all elements like zinc, gold, aluminum, and oxygen.
Therefore, a list that contains only elements is option B which includes zinc, gold, aluminum, and oxygen.
To learn more about Chemical elements, refer to the link:
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