In which situation is it better to have low friction?

Choose the correct answer.


a skydiver uses a parachute

a student walks down a hallway

a ladder leans against the wall

a hockey puck slides toward the goal

Answers

Answer 1
A student walks down a hall I’m pretty sure
Answer 2

Answer: D- a hockey puck slides toward the goal

Explanation:

It needs to be able to slide easily and thats the correct answer on the test


Related Questions

Volcanic belts form along
a.
islands in the Pacific Ocean.
b.
North American mountain ranges.
c.
the boundaries of Earth’s plates.
d.
the coast of Antarctica.


Please select the best answer from the choices provided

Answers

C. The boundaries of earths tectonic plates

Pioneer species like Lichens and Mosses inhabit an area after a major disturbance, such as a volcanic eruption. Over time, other species are found in the disturbed areas, and the number of pioneer species decreases. Why does the number of pioneer species get less?

Answers

Answer:

The number of pioneer species get less as the area has more soil to support complex plants and the competition decreases the role of pioneer species.

Explanation:

Pioneer species like Lichens and Mosses inhabit an area after a major disturbance, such as a volcanic eruption. However, with time the number of pioneer species decreases.

The number of pioneer species get less as the area has more soil to support complex plants and the competition decreases the role of pioneer species.

Why are biopharmaceuticals in high demand?

Answers

Answer:

the market is largely driven by the growing population, increasing burden of chronic disease, and rising inclination toward targeted therapy.

Explanation:

also, the huge demand of biopharmaceutical is facilitated by an accelerating focus in research and related investment.

Neturally an atom is neutral in charge why​

Answers

Answer

Explanation:

an atom is usually define as a perfect balance of electrons and protons

Rubbing alcohol or isopropanol can be described by the chemical formula C3H7OH. One milliliter of isopropanol has a mass of 0.76 g, so its density is 0.76 g/mL. Isopropanol is often used as a cleaner or a disinfectant and evaporates when placed on warm objects. However, caution must be taken when using isopropanol, because it is also highly flammable. Which of the following is a chemical property of isopropanol?
A. One mL of isopropanol has a mass of 0.76 g.
B. Isopropanol has a density of 0.76 g/mL.
C. Isopropanol evaporates when placed on a warm object.
D. Isopropanol is flammable.

Answers

A chemical property of isopropanol : D. Isopropanol is flammable.

Further explanation

There are changes that occur in the mater: physical changes and chemical changes

Classification uses the principle of the initial and final state of the substance.

Physical changes do not form new substances, so the properties of the particles remain the same.(size,volume,shape)

Example : boiling and freezing, just change its phase form from liquid to gas or from liquid to solid

 

Chemical changes/reaction form new substances(products) that are different from the initial substances(reactants)

Example : toxic, corroded

So :

the physical properties of isopropanol :

mass, density, evaporation

the chemical properties of isopropanol :

highly flammable

Answer:

D. Isopropanol is flammable.

Explanation:

Mass, volume, temperature, phase of matter, color, texture, density, and hardness are all examples of physical properties. However, flammability is an example of a chemical property.

Chemical properties describe an object's potential to change its chemical composition. These properties depend on the types of atoms found in the object and the arrangement of those atoms (and their subatomic particles).

Whas the the ionic radius of strontium

Answers

Answer: 255 pm

Explanation: Hope this helps!

What occurs to the particles in a fluid during convection ?

Answers

Answer: what are options

Explanation:

ANSWER ASAP PLEASE!!

What determines how many of each ion is required for an ionic compounds?

please do not look up on google!!!!

Answers

Each ion has a single charge, one positive and one negative, so we need only one ion of each to balance the overall charge. When writing the ionic formula, we follow two additional conventions: (1) write the formula for the cation first and the formula for the anion next, but (2) do not write the charges on the ions.

Which refers to a method that relies on sound waves and is used by different animal species for navigation,
communication, and finding food?
echolocation
analog signaling
infrared detection
o digital location
HELP FAST ILL MARK BRAINLEST

Answers

Answer:

A

Explanation:

got it on edge

An echolocation refers to a method that relies on sound waves and is used by different animal species for navigation, communication, and finding food. Therefore, option A is correct.

What is an echolocation ?

Echolocation is a method used by bats, dolphins, and other animals to locate objects using reflected sound. This enables the animals to move around in complete darkness, allowing them to navigate, hunt, recognize friends and enemies, and avoid obstacles.

(1) To hunt for prey, bats make high-frequency sounds. (2) Sound waves are used by dolphins and other toothed whales to locate prey and navigate their surroundings. (3) Nocturnal oil birds use echolocation to navigate their surroundings, particularly in low-light conditions.

Echolocation is used to help with orientation, obstacle avoidance, food acquisition, and social interactions.

Thus, option A is correct.

To learn more about an echolocation, follow the link;

https://brainly.com/question/7828418

#SPJ6

If the density of a substance is 2.18 g/mL, how would you find the density given that the mass is 0.987 kg and the volume is 4.52 x 102 mL?

Answers

Answer:

Explanation:

Convert mass in gms .. 987 gms

Density = mass/ volume

= 987/4.52 x102

= 2.18 g/mL

32 N of Force. 37 N force. How strong is the net force and in which direction?

Answers

5 units to the left.

Explanation:
They are working against each other. That means you subtract.

32 - 37 = -5

You are moving 5 units to the left because 37 is negative which means it is moving left. The key word is left. In physics, you would get the same answer if you did it this way.

37 - 32 = 5

The 5 moves in the same direction as the 37

How does the valence electron configuration (entire last energy level configuration) relate to the group number on the Periodic Table? Use the shorthand notation in your discussion.

Answers

Answer:

The valence electron configuration determines the group to which an element belongs to.

Explanation:

The valence electron configuration of an atom of an element refers to the number of electrons in that atoms outermost shell.

The valence electron configuration is related to the group number of an element in that the number of electrons in the valence shell of an atom of an element determines the group to which an element belongs to. For example, all elements having one valence electron belong to group IA of the periodic table. Similarly, all elements having seven valence electrons belong to group VIIA of the periodic table.

This is because, since the reactivity of an element is related to its ability to either gain or lose a certain number of electrons in its valence shell, elements having same number of valence electrons have similar chemical properties.

If a wave of red light has a wavelength of 6.7 x 10-7 m, will the frequency of the red wave be high or low?

Answers

Answer:

Its high

Explanation:

Becuase if u times it what do u get

Calculate the heat that must be supplied to
a 532 , stainless steel vessel containing 375 g
of water to raise its temperature from 35 C
to the boiling point of water 100°C. Cs. =0.51 J/g. degrees C
Answer in units of J.

Answers

Q must be supplied = 119523.3~J

Further explanation  

The law of conservation of energy can be applied to heat changes, i.e. the heat received/absorbed is the same as the heat released  

Q in = Q out  

Heat can be calculated using the formula:  

Q = mc∆T  

Q = heat, J  

m = mass, g  

c = specific heat, joules / g ° C  

∆T = temperature difference, ° C / K  

So from the question :

Q to the system(Q supplied) = Q water + Q steel vessel(Q gained)

[tex]\tt Q~supplied=m.c\Delta T(water)+m.c\Delta T(vessel)\\\\Q~supplied=375\times 4.18\times (100-35)+532\times 0.51(100-35)\\\\Q~supplied=101887.5+17635.8=119523.3~J[/tex]

What kinds of paintings did Winslow Homer make​

Answers

145 artworks
He was best known for drawing,
Wood engravings
Oil painting
Water color painting.
Mostly self-taught, Homer is known for the visceral force of the waves in his oil paintings, but his watercolors are an antidote to any visual heaviness and weight. As his early paintings reveal, watercolor is where he shined as an artist with a graceful, innovative hand.

Have a great day :)

choose the letter that best describes the behavior of a substance during a phase change:

/A/ neither absorbs or releases energy

/B/ always absorbs energy

/C/ always releases energy

/D/ either absorbs or releases energy

Answers

Answer:

/D/ either absorbs or releases energy

Explanation:

During a phase change energy is either absorbed or released.

A phase change is a reversible process which occurs when a substance changes is its state from one form to another.

Phase changes are used to delineate physical changes.

A phase diagram provides a graphic representation of the change. The diagram can be 2 dimensional or 3 dimensional.

Do you guys have viruses wit this website

Answers

With what website???

You are conducting an experiment with two very reactive substances. One will react with oxygen (O) and other substances in the air, and the other will react to metal in a container. What type of environment can you seal them in so they only react with each other?

Answers

Answer:

seal them in a glass container in an atmosphere of argon (Ar) gas

Explanation:

What is a system?
A. An isolated piece of the world
OB. A liquid in which reactions take place
O C. A piece of scientific equipment
O D. A technique for recording data

Answers

Answer:

D. a technique of recording data

Help ASAP!!!! Plz!!!!!!!

Answers

The atomic number,protons and electrons are all the same! The neutrons you just add by 1 to the protons. The atomic mass is at the bottom. For example- for oxygen the atomic #,protons, and electrons would all be 8. The neutron would be 9 and the atomic mass is 15.999.

During the Metric Olympics yesterday, Molly's long jump was 118.3 cm. Christy accidentally recorded her results in inches. She jumped 51.18 inches. Can you help... Who won the long jump? Christy won by about 30 cm Christy won by about 30 cm Molly won by about 25 cm Molly won by about 25 cm Christy won by about 12 cm Christy won by about 12 cm Molly won by about 10 cm

Answers

Answer: Christy won Molly by 12cm

Explanation:

Ist step

Molly's ;ong jump was 118.3cm

Christy long jump was 51.18inches

2nd Step

we change christy score to cm so we can compare

1 inch = 2.54cm.

therefore 51.18 inches = 51.18 x 2.54= 129.9972cm

Christy won molly by 129.9971cm-118.3cm=11.69 rounded to 12cm

Christy won Molly by 12cm

Is a backpack a good resource
for a rescue team?

Answers

yes because it helps you carry items that you need inside of it.

How many moles are in a sample of 2.39 x 10^23 atoms of sodium (Na)

Answers

Answer:

The answer is 0.4 moles

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

[tex]n = \frac{N}{L} \\ [/tex]

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

[tex]n = \frac{2.39 \times {10}^{23} }{6.02 \times {10}^{23} } \\ = 0.39700996...[/tex]

We have the final answer as

0.4 moles

Hope this helps you

Which has a smaller ionic radius than it's neutral atom?
A. Iodine
B.Cesium
C.Oxygen
D.Nitrogen

Answers

Explanation:

Caesium (Cs) has a smaller ionic radius than it's neutral atom.

because Caesium belong to Group 1 and It loses 1 electron. After losing 1 electron it gains 1 positive charge that's why caesium ionic radius become smaller as compared to neutral atom.

Therefore,

Option B is correct.

Which describes the elements in a given group of the periodic table?

They decrease in atomic mass as you go down the column.
They increase sequentially in atomic number from top to bottom.
They are in the same family, with similar characteristics.
Their properties change according to a pattern as you go down the column.

Answers

Answer:

They are in the same family, with similar characteristics.

Explanation:

The elements in a given group of the periodic table are in the same family and with similar characteristics.

Vertical columns on the periodic table are referred to as a group or family. Elements having the same number of electrons in the outermost shell of their atoms are placed one another in vertical columns. Each resulting vertical column is a group or family. Elements in the same group exhibit similar chemical properties because of the same number of electrons in their atoms' valence shells.

how to determine the atomic mass?​

Answers

Answer: To calculate the atomic mass add up the mass of protons and neutrons.

I hope I helped!

What is the decomposition of 2LiCIO3

Answers

Decomposition is AB —> A + B

2LiClO3 —> 2LiCl + 3O2

In reality, energy conversion from burning fuel is never 100% efficient. Significant loss of energy due to heating occurs. If the generator were only 20% efficient (which is more realistic), how much energy in joules would be converted to electrical energy and how much would be lost to heat? (2 points)​

Answers

Answer:

Electrical energy = 130000000 J and Heat energy = 520000000 J

Explanation:

Multiply the amount of joules from the last question (650000000) by .20 and .80. (Which are the percentages)

colonel flanders makes boxes of chicken with various numbers of pieces. He charges $ 0.40 for each piece of chicken, plus a fixed charge of $ 0.55 for the box, the rolls, etc. If Iddy Ottic bought the $6.95 box, how many piecesof chicken should the box contain?

Answers

The answer is 16 pieces of chicken
Subtract 0.55 from 6.95 and you get 6.40
The divide 6.40 by 0.40 and you get 16

Scientists and nutritionists have long suspected that high-fructose corn syrup, used to

sweeten soft drinks, is one of the causes of childhood obesity. In a recent study, at the

University of Cincinnati, researchers found that mice that drank water with added

fructose ate less solid food, gained more weight, and put on 90% more body fat than

mice that drank only water. Scientists concluded that fructose may affect metabolism in

a way that favors fat storage.

What is the independent variable?

The mice that drank only water

The presence of fructose in their diet

The quantity of water provided

The weight gained by the mice

Answers

Answer:

The presence of fructose in their diet

Explanation:

The independent variable in an experiment is the type of variable which is changed at intervals in order to study if it has a direct effect on the dependent variable.

The dependent variable in the experiment is the amount of weight gained by the mice in each group and the control group is the mice who drank the water without the fructose added.

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