The part of the microscope that will be used first to adjust the focus when starting with the lowest power lens is the coarse focus.
When starting with the lowest power lens, the coarse focus is typically used first to adjust the focus on the specimen. Here's a step-by-step explanation:
Ocular Lens: The ocular lens, or eyepiece, is the lens at the top of the microscope that you look through. It does not directly adjust the focus but contributes to the overall magnification of the image.
Coarse Focus: The coarse focus knob is typically located on the microscope's arm or body and is used to make large adjustments to the focus. It moves the stage up or down to bring the specimen closer or farther away from the objective lens.
Low Power Lens: When starting with the lowest power lens, such as the 4x or 10x objective, use the coarse focus knob to bring the specimen into approximate focus. Turn the knob in the appropriate direction until the image becomes clearer.
Fine Focus: Once the specimen is roughly in focus using the coarse focus, the fine focus knob can be used for fine adjustments. The fine focus knob is usually smaller and more precise than the coarse focus knob. It allows for finer focus adjustments to achieve a clear and detailed image of the specimen.
In summary, when starting with the lowest power lens, the coarse focus is the part of the microscope that will be used first to adjust the focus. It provides initial adjustments to bring the specimen into approximate focus before fine-tuning with the fine focus knob.
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bungee jumpers leap off high cliffs to enjoy the speed gravity gives them. what is the speed of a jumper 10 seconds after jumping
Answer:
98 m/s.
Explanation:
In this problem, we need to find the speed of a jumper 10 seconds after jumping. Initially, the bungee jumper was at rest. Let v is the speed after 10 s. Using first equation of motion.
v = u +at
Here, u = 0 and a = g
v = gt
v = (9.8 m/s)(10 s)
v = 98 m/s
So, the speed of a jumper 10 seconds after jumping is 98 m/s.
Answer:
-98
Explanation:
negative because -9.8(10)
What are tiny sacs at the end of the bronchioles filled with air called?
Answer:
Alveoli
The bronchioles end in tiny air sacs called alveoli, where oxygen is transferred from the inhaled air to the blood.
Hope this helps :)
You pull a sled with a package on it across a snow-covered flat lawn. If you
apply a force of 46.8 N to the sled, it accelerates at 0.75 m/s2. What is the
combined mass of the package and the sled? (Assume there is no friction.)
A. 62.40 kg
B. 52.50 kg
C. 96.75 kg
D. 35.10 kg
Answer:
m = 62.4 kg
Explanation:
The force applied to the sled, F = 46.8 N
Acceleration of the sled, a = 0.75 m/s²
We need to find the combined mass of the package and the sled. Let it is m. Using definition of force as follows :
F = ma
[tex]m=\dfrac{F}{a}\\\\m=\dfrac{46.8}{0.75}\\\\m=62.4\ kg[/tex]
So, the mass of the package and the sled is 62.4 kg.
Answer:A
Explanation:
Please answer these questions ASAP 100 POINTS
How are the metals divided from the nonmetals?
Where are the metals found on the periodic table?
Where are the non-metals found on the periodic table?
Where are the metalloids found on the periodic table?
What determines how the atoms are organized on the periodic table of elements?
What does being in a certain group tell us about elements?
Why is the periodic table of elements periodic?
How many liquids at room temperature are on the periodic table?
How many gases at room temperature are on the periodic table?
What is the name of group 1?
What is the name of group 2?
What is the name of group 3-12?
What is the name of group 13?
What is the name of group 14?
What is the name of group 15?
What is the name of group 16?
What is the name of group 17?
What is the name of group 18?
Which group of metals is the most reactive?
Which group of nonmetal is the most reactive?
Which group is nonreactive?
Where is the Actinide series found? (Period and group)
Where is the Lanthanide series found? (Period and group)
Answer:
Explanation:
1.The metalloids separate the metals and nonmetals on a periodic table. Also, many periodic tables have a stair-step line on the table identifying the element groups. The line begins at boron (B) and extends down to polonium (Po). Elements to the left of the line are considered metals.
2.left
Metals are located on the left of the periodic table, and nonmetals are located on the upper right. They are separated by a diagonal band of semimetals.
3.Nonmetals are located on the far right side of the periodic table, except hydrogen, which is located in the top left corner. The 17 nonmetal elements are: hydrogen, helium, carbon, nitrogen, oxygen, fluorine, neon, phosphorus, sulfur, chlorine, argon, selenium, bromine, krypton, iodine, xenon, and radon.
4.The metalloids; boron (B), silicon (Si), germanium (Ge), arsenic (As), antimony (Sb), tellurium (Te), polonium (Po) and astatine (At) are the elements found along the step like line between metals and non-metals of the periodic table.
5.Elements are placed in order on the periodic table based on their atomic number, how many protons they have. In a neutral atom, the number of electrons will equal the number of protons, so we can easily determine electron number from atomic number.
6.Each column is called a group. The elements in each group have the same number of electrons in the outer orbital. Those outer electrons are also called valence electrons. ... As you keep counting the columns, you'll know how many electrons are in the outer shell.
7.The periodic table (also known as the periodic table of elements) is organized so scientists can quickly discern the properties of individual elements such as their mass, electron number, electron configuration and their unique chemical properties.
8.two liquid
The two liquid elements at room temperature are mercury (symbol Hg and atomic number 80) and bromine (symbol Br and atomic number 35). Mercury is the only metal that is a liquid at room temperature.
9. 11 gases
There are 118 elements on the periodic table, with 11 of those elements being gases at room temperature. Group 18 (the elements in blue) are noble gases
10.The Group 1 elements in the periodic table are known as the alkali metals. They include lithium, sodium and potassium, which all react vigorously with water to produce an alkaline solution.
11.alkaline earth metals
.
12.transition metals
13.boron group
14.Carbon group element
15.Nitrogen group element
16.chalcogen
17.Halogen
18.Noble Gases
19.element fluorine
20.element fluorine
21.Noble gases are nonreactive
22.The Actinide series contains elements with atomic numbers 89 to 103 and is the sixth group in the periodic table. The series is the row below the Lanthanide series, which is located underneath the main body of the periodic table
23.Group 3
A period 6 element is one of the chemical elements in the sixth row (or period) of the periodic table of the elements, including the lanthanides.
A car travels north at 30.0 m/s for 10.0 min. It then travels south at 40.0 m/s for 20.0 min. What are the total distance that car travels and its displacement?
Answer:
A car travels north at 30.0 m/s for 10.0 min. It then travels south at 40.0 m/s for 20.0 min. What are the total distance the car travels and its displacement?
Let DS & DP denote net distance & net displacement of the car.
Hence from above data we get following relations,
DS = 10*60*30 + 20*60*40
or DS = 18000 + 48000
or DS = 66000 (m) = 66 (km) [Ans]
DP = + 10*60*30 (NORTH) - 20*60*40 (SOUTH) [assuming NORTH as +ve]
or DP = + 18000 (NORTH) - 48000 (SOUTH)
or DP = - 30000 (SOUTH) = - 30 (km) (SOUTH)
Genetic variations in a population are caused by random what?
Answer:
mutation
Explanation:
Genetic variations in a population are caused by random mutations.
Genetic variations refer to the differences in DNA sequences between individuals in a population. These variations are the result of random mutations that occur in the DNA of organisms over time. Mutations are changes in the genetic code, and they can happen spontaneously during the process of DNA replication or due to external factors such as radiation, chemicals, or environmental influences.
When cells replicate, they sometimes make errors in copying their DNA, leading to new genetic information. These mutations can be neutral, harmful, or occasionally beneficial. Harmful mutations may lead to genetic disorders, whereas beneficial mutations can provide certain individuals with advantages in adapting to their environment.
Over generations, genetic variations accumulate in a population. Natural selection then plays a crucial role in determining which variations are advantageous and which are not. If a particular genetic variation offers a survival or reproductive advantage, it is more likely to be passed on to future generations, leading to evolutionary changes in the population.
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hi :) why is the second last (about radiation through vacuum) false?
Answer:
Explanation:
This would be false because thermal energy transfer through radiation can also travel through matter as well as the vacuum.
(sorry i'm not to good at explaining things)
Which of the following caused tension amount the pilgrims shortly after the mayflower’s settlement at the Plymouth colony?
They could not unite and agree on a way to govern the colony.
Some colonist wanted to go back and return to England
The kind did not give permission for the colonists to stay in the newfound territory.
The winter weather caused roughly half of the initial 100 settlers to die upon arriving in America
Answer:
the weather cast half of them to die
Atmospheric pressure is greater at the base of a mountain than at
its peak. A hiker drinks from a water bottle at the top of a mountain. The
bottle is capped tightly. At the base of the mountain, the water bottle has
collapsed slightly. What happened to the gas inside the bottle? Assume
constant temperature.
At the top of the mountain, when he tightens the cap onto the bottole, there is some water and some air inside the bottle. Then he brings the bottle down to the base of the mountain.
The pressure on the outside of the bottle is greater than it was when he put the cap on. If anything could get out of the bottlde, it would. But it can't . . . the cap is on too tight. So all the water and all the air has to stay inside, and anything that can get squished into a smaller space has to get squished into a smaller space.
The water is pretty much unsquishable.
Biut the air in there can be COMPRESSED. The air gets squished into a smaller space, and the bottle wrinkles in slightly.
Describe two uses for a member of each representative group.
what is similar between scientific theory and scientific law
Answer:
Explanation:
In general, a scientific law is the description of an observed phenomenon. It doesn't explain why the phenomenon exists or what causes it. The explanation of a phenomenon is called a scientific theory.
When the wavelength decreases, the frequency:
A. INCREASES
B. DECREASES
C. REMAINS THE SAME
D. STOPS
12.
Which of the following does NOT describes alpha decay?
a. changes the elemental identity of the atom c. absorbs binding energy to produce more stable
nucleus
b. emits a high energy helium nucleus d. mostly occurs in proton heavy nuclei below the zone of
stability
The higher the object is and the heavier it is, the less gravitational potential energy it stores.
A. True
B. False
Which of the following could describe the velocity of a bicyclist? *
10 m/s2
10 m/s north
10 m/s2 north
10 m/s
Answer:
The answer is 10 m/s north
If you dropped a ball while standing on the surface of Uranus, at what rate would it accelerate toward the ground?
Uranus is a ball of ice and gas, so you can’t really say that it has a surface. If you tried to land a spacecraft on Uranus, it would just sink down through the upper atmosphere of hydrogen and helium, and into the liquid icy center. So it would sink into the planet.
And so would you if your standing on Uranus ·ω·
A student drops a rock from a bridge to the
water 13.1 m below.
With what speed does the rock strike
the water? The acceleration of gravity is
9.8 m/s
2
.
Answer in units of m/s.
Which answer best explains why the contents of a warm can of carbonated drink might rush out of the can faster than the contents of a cold can when the cans are first opened? A The warm drink is under higher pressure than the cold drink, B The temperature of the gas in the warm drink increases when the can is opened. The volume of the drink decreases slightly when the temperature increases D The warm drink has more gas dissolved in it than the cold drink,
Answer:
its A
Explanation:
Answer:
Explanation: I had this test
A dog pushes a ball 0.25 kg with a net force of 4 N. What is the acceleration?
O 3.75 m/s2
O 4.25 m/s2
O 16 m/s2
1 m/s2
why did she leave me
She left you.. for another pokemon.
O_o - SikeBrehh 9
Answer:
cuz charmander is better lol
Explanation:
As a projectile falls, what happens to the components of velocity?
Question 25 options:
vertical velocity decreases in magnitude, horizontal velocity decreases
vertical velocity decreases in magnitude, horizontal velocity decreases
vertical velocity increases in magnitude, horizontal velocity stays the same
vertical velocity increases in magnitude, horizontal velocity increases
Answer:
Option (c).
Explanation:
An object when when projected at an angle, will have some horizontal velocity and vertical velocity such that,
[tex]v_x=v\cos\theta\ \text{and}\ v_y=v\sin\theta[/tex]
[tex]\theta[/tex] is the angle of projection
The horizontal component of the projectile remains the same because there is no horizontal motion. Vertical component changes at every point.
As a projectile falls, vertical velocity increases in magnitude, horizontal velocity stays the same .
As a projectile falls, The vertical velocity increases in magnitude and horizontal velocity stays the same as the components of velocity.
What is vertical velocity?acceleration caused by gravity always affects velocity in the vertical direction, it is a unique sort of velocity. This acceleration, which has a magnitude of around 10 meters/second/second, or 10 meters/second squared, directed downward, toward the center of the earth, affects any object that is hurled up, thrown down, or dropped in a vertical direction.
The thingswhich goess up must come down is a proverb that perfectly captures vertical velocity. Objects will fall back to the earth at a pace of around 10 meters per second every second due to the earth's gravity.
Therefore, As a projectile falls, The vertical velocity increases in magnitude, and horizontal velocity stays the same as the components of velocity.
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Question 2
1 pts
A study performed yielded results that indicated the more natural sunlight a person was
exposed to, the more likely they were to show increases in serotonin in their
bloodstreams. This correlation is an example of a
correlation
A car is travelling to the right with a speed of 42 m/s when the driver slams on the brakes. The car skids for 4.0 s
with constant acceleration before it comes to a stop.
What is the displacement of the car as it skids to a stop?
Answer:
84
Explanation:
use d= (vi+vf/2)t to solve goodluck <3
Someone help me pls I will give brainlist
Answer:
the answer is point no. a °C , c. K and d. °F
Answer:
C and F
Explanation:
Because that’s how weather people measure tempature
(Brainliest?)
A tennis ball is thrown straight up into the air with an initial velocity of 12.7 m/s. How high does the tennis ball travel?
Answer:
8.22m
Explanation:
As interpreted from this problem, the angle of launch is 90 degrees as it is thrown straight up. Given an angle launch of 90°, upward initial velocity of 12.7m/s, and initial height of 0m. A much simpler equation can be used to find the maximum height.
[tex]h_{max} = h_ {0} + \frac{{v_0}^{2} }{2g}[/tex]
this means that the max height is equal to the initial height plus the initial velocity squared divided by 2 times the acceleration of earth's gravity(≈9.8m/s^2 or 10m/s^2 depending on how you fix it).
when substituted into the equation, you should get.
(9.8m/s^2)
hmax = 0 + ((12.7)^2)/(2*9.8)
hmax = 161.29/19.6 ≈ 8.22
hmax = 8.22m
Someone Pls help me it will help. I will give brainlist.
Answer:
nm i believe pls crown
Explanation:
Formulating a Hypothesis
Write a hypothesis about the effect of the fan speed on
the acceleration of the cart. Use the "if then
because "format and be sure to answer the lesson
question: "How does an object's position and velocity
change as the object accelerates?"
Answer:
If the fan speed increases, then the acceleration increases because a greater fan speed supplies more energy to move the cart.
Explanation:
Astronomers observe a spectral analysis of a distant star where a particular element has a spectral line with a wavelength of 663 nm. In the laboratory, the same element has a spectral line with a wavelength of 645 nm.
a. How fast is the star moving, and in what direction is it moving?
b. The same element on Earth’s surface is observed from a space shuttle orbiting at 7800 m/s,
350 km above Earth. Is the same shift in the spectral line seen from the space shuttle? Why or why not?
Answer:
(a). The velocity of star is [tex]8.1\times10^{6}\ m/s[/tex] and the direction of star toward the earth.
(b). The shift is 0.0168 nm.
Explanation:
Given that,
Wavelength of spectral line = 663 nm
Wavelength of spectral line in lab = 645 nm
(a). We need to calculate the velocity
Using doppler's effect
[tex]\Delta \lambda=\dfrac{v}{c}\lambda[/tex]
Where, [tex]\Delta\lambda[/tex]= change in wavelength
v = velocity
c = speed of light
Put the value into the formula
[tex]663-645=\dfrac{v}{3\times10^{8}}\times663[/tex]
[tex]v=\dfrac{3\times10^{8}(663-645)}{663}[/tex]
[tex]v=8144796.38\ m/s[/tex]
[tex]v=8.1\times10^{6}\ m/s[/tex]
The direction of star toward the earth.
(b). Speed = 7800 m/s
We need to calculate the shift
Using formula of shift
[tex]\Delta \lambda=\lambda(\sqrt{\dfrac{1+\dfrac{v}{c}}{1-\dfrac{v}{c}}}-1)[/tex]
Put the value into the formula
[tex]\Delta \lambda=645\times(\sqrt{\dfrac{1+\dfrac{7800}{3\times10^{8}}}{1-\dfrac{7800}{3\times10^{8}}}}-1)[/tex]
[tex]\Delta\lambda=0.0168\ nm[/tex]
This shift is small compare to the the movement of Earth around the sun.
Hence, (a). The velocity of star is [tex]8.1\times10^{6}\ m/s[/tex] and the direction of star toward the earth.
(b). The shift is 0.0168 nm.
A spy in a speed boat is being chased down a
river by government officials in a faster craft.
Just as the officials’ boat pulls up next to the
spy’s boat, both boats reach the edge of a 5.4
m waterfall. The spy’s speed is 16 m/s and
the officials’ speed is 24 m/s.
How far apart will the two vessels be when
they land below the waterfall? The acceleration of gravity is 9.81 m/s
Answer in units of m.
what do you mean by momentum.Explain
