Answer;
Hypothesis
Explanation;
A hypothesis is a tentative explanation that accounts for a set of facts and can be tested by further investigation. Scientific hypotheses must be posed in a form that allows them to be tested.
- It represents a possible explanation for an observation, phenomenon, or scientific problem that can be tested by further investigation. Once you do the experiment and find out if it supports the hypothesis, it becomes part of scientific theory. An example of a hypothesis; Hypothesis: Bacterial growth may be affected by temperature.
Answer:
1. Wf= 627.9 J
2. Wg= 416.32J
3. Work done by normal force = 0 always
4. Wk = 192.3J
5. Wt = 19.28 J
Explanation:
The question have no questions specific so here some possible questions:
1) Calculate the work done on the suitcase by the force F
2) Calculate the work done on the suitcase by the gravitational force.
3) Calculate the work done on the suitcase by the normal force.
4) Calculate the work done on the suitcase by the friction force.
5) Calculate the total work done on the suitcase.
1)
work = F * d
Wf= 161N * 3.90m
Wf= 627.9 J
2)
work = mgh
Wg= 20kg*9.8m/s² * 3.9m*sin33º
Wg= 416.32J
3)
Work done by normal force = 0 always
4)
friction work = µmgdcosΘ
Wk = 0.30*20kg* 9.8m/s²*3.90m*cos33º
Wk = 192.3J
5)
total work = (627.9- 416.32- 192.3) J
Wt = 19.28 J
Answer:
A, B and C
Explanation:
The A, B and C look most probable. Heat energy flared to atmosphere might not be recovered. It could end up heating up the atmosphere.
Other than temperature, the property that also has an effect on the rates of chemical reactions is the concentration of the reactants. The correct answer is B
The rate of chemical reaction means how chemical react with respect to time or as a function of time. The rate of chemical reaction tells us the speed or how fast chemicals react.
There are many factors that can affect the rate of chemical reaction. Temperature is one of them. Increase in temperature will increase the rate at which chemical react.
The color of reactants, solubility of reactants and volume of reactants have nothing to do with the rate of chemical reaction.
Other than temperature, the property that also has an effect on the rates of chemical reactions is the concentration of the reactants.
Other factors affecting the rate of chemical reaction are:
- the physical state of the reactants
- surface area
- temperature
- and the presence of a catalyst
Therefore, the correct answer is option B
Learn more about chemical reaction here: brainly.com/question/11231920?source=archive
Wavelength= speed / frequency
so.....3× 10^8 / 7.26×10^14
= .413× 10^(-6)
in scientific notation= 4.13×10^(-7)
in nanometer = 413 nm
