(a)Explain
(i)why the rate of loss of thermal the walls of the flask by conduction is very low.
_______________________________________________________________
(ii)why the rate of loss of thermal energy through the walls of the flask by radiation is very low.
_________________________________________________________
(b)Suggest with reasons,what must be added to the flask shown in the pic in order to keep the liquid hot.
____________________________________________________
Answer:
the vacuum between the glass walls. ... Since air is a poor conductor of heat, having trapped air in the sponge and hollow plastic stopper help to prevent heat loss by conduction
Energy Transformations
Choose the sequence of energy forms that best fits each item.
__________ 1. Flashlight a. chemical energy→ electrical energy→ light energy
__________ 2. Electric saw b. electrical energy → thermal energy
__________ 3. Toaster c. electrical energy → mechanical energy
__________ 4. Gas Scooter d. mechanical energy → electrical energy
__________ 5. The Sun e. mechanical energy → sound energy
__________ 6. Wind Turbine f. chemical energy → electrical energy →sound energy
__________ 7. iPod g. chemical energy → thermal energy →mechanical energy
__________ 8. Speaker vibrates h. nuclear energy → light energy and heat energy
(9) __________________________________ energy from gas, oil, or coal provides
(10) _____________________________ energy to produce steam. A turbine changes the energy of the steam into the
(11) _____________________________________ energy of the rotating turbine and generator. The generator converts this energy into
(12) ___________________ energy. The lamp is an energy converter, changing (13)_________________________ energy to
(14) ________________________ energy.
Answer:
1. chemical energy --> electrical energy --> light energy
2. Electrical Energy --> Mechanical Energy
3. Electrical Energy --> Heat Energy
4. Chemical Energy --> Thermal Energy --> Mechanical Energy
5. Nuclear Energy --> Light energy and thermal energy
6. Mechanical Energy --> Electric Energy
7. Chemical Energy --> Electrical Energy --> Sound Energy
8. Mechanical Energy --> Sound Energy
Explanation:
An engineer has the task of producing an aluminum alloy with a density of 3.0 grams per cubic centimeter. She comes up with the perfect alloy and saves a sample of it. Which mass and volume measurements correspond to this sample?
7 g and 2.3 cm³
10 g and 7 cm³
15 g and 5 cm³
21 g and 8 cm³
Answer:
The best option is for the following option m = 15 [g] and V = 5 [cm³]
Explanation:
We have that the density of a body is defined as the ratio of mass to volume.
[tex]Ro =m/V[/tex]
where:
Ro = density = 3 [g/cm³]
Now we must determine the densities with each of the given values.
For m = 7 [g] and V = 2.3 [cm³]
[tex]Ro=7/2.3\\Ro=3.04 [g/cm^{3} ][/tex]
For m = 10 [g] and V = 7 [cm³]
[tex]Ro=10/7\\Ro=1.42[g/cm^{3} ]\\[/tex]
For m = 15 [g] and V = 5 [cm³]
[tex]Ro=15/5\\Ro=3[g/cm^{3} ]\\[/tex]
For m = 21 [g] and V = 8 [cm³]
[tex]Ro=21/8\\Ro=2.625[g/cm^{3} ]\\[/tex]
You are riding a skateboard and hit a hole in the street, causing you to fly off the board and crash. Which law represents this action? *
Answer:
It's Laws of Motion
Explanation:
When you move your head from side to side or walk around, the apparent movement of stationary objects relative to one another is ________________________________.
Answer:
Motion parallax cue.
Explanation:
Motion parallax cue can be defined as a monocular depth cue that arises from objects moving at constant velocity (speed) across the retina or frame appearing to move faster when they are closer to the observer than they appear if they were at a farther distance.
Simply stated, motion parallax refers to a change in position due to the movement of the observer.
Hence, when you move your head from side to side or walk around, the apparent movement of stationary objects relative to one another is known as motion parallax cue.
Therefore, monocular depth cues such as motion parallax gives a valid explanation as to why stationary objects such as trees appear to move when you move your head from side to side.
For example, an observer (passenger) in a moving car looking outside the window would see stationary objects moving due to motion parallax cue.
According to Newton’s first law of motion, a moving object that is not acted on by an unbalanced force will..
Answer:
continue in its motion
Explanation:
a hurricanes energy comes from?
Answer:
a or b
Explanation:
Answer:
The answer is C, condensation or large amounts of water vapor and the second question is correct too.
Explanation:
An example of ________ would be the horizontal distance a soccer ball moves between being kicked and touching the ground again.
Answer:
Range.
Explanation:
Range in projectile motion can be defined as the horizontal distance traveled by an object.
An example of range would be the horizontal distance a soccer ball moves between being kicked and touching the ground again.
Please I need help with this question (see image).
Show workings where necessary.
Answer:
The specific heat capacity of something is simply the amount of heat energy required to raise 1g of that substance or object by 1°C.
The specific heat capacity of something is simply the amount of heat energy required to raise 1g of that substance or object by 1°C.It is given by the formula Q = mcΔT, where Q is the energy transferred (J), m is the mass of the substance (kg), c is the specific heat capacity, and ΔT is the temperature change (°C).
Does anyone have a science fair Idea in the topic force and motion? Please I need help!
Answer:
i did this project where i took two marbles pool noodles and tape then i made a ramp and i saw which marble would go down faster the big marble or the little marble hope this helps!!
Which statement describes an example of constructive interference?
A. Two TV signals reach an antenna and cancel each other out.
B. Light forms bars on a surface after passing through two slits.
C. Oil spilled in a water puddle shows different colors of light.
D. A cell-phone signal is lost when you pass through a certain area.
Answer:
b
Explanation:
because Constructive interference occurs when the maxima of two waves add together (the two waves are in phase), so that the amplitude of the resulting wave is equal to the sum of the individual amplitudes. Equivalently, the minima of the waves would be aligned.
1. What is the final velocity of the 1200-kg car after the collision?
a substance that vigorously reacts with most metals to produce hydrogen, readily conducts electricity, turns litmus red, and has a pH less than 7; typically corrosive or sour-tasting.
A: suspension
B: base
C: acid
D: colloid
Answer:
C. Acid
Explanation:
If you have chemistry classes and performed experiments regarding acids and bases, you would physically tell it's acid if the lithmus paper turned red and base if it turned blue. Also, in the pH level chart, there are only two characteristics--acidic and basic. Since it has less than 7 pH, it is definitely acid. Plus, remember the taste of some vitamin C tablets? It has a sour taste to it, isn't it? This is because of ascorbic acid.
The given properties are indicating the substance is acid. Therefore, option (C) is correct.
What are acids and bases?An acid can be described as any substance that is capable of losing a proton to another substance. A base can be described as a molecule or ion that can accept a hydrogen ion from an acid.
Acidic substances can be identified by their sour taste. Acid is usually a molecule that donates an H⁺ ion and can be energetically favorable after a loss of an H⁺ ion. Acids are also capable to turn blue litmus into the red.
Bases can be characterized by a slippery texture and a bitter taste. A base that can be dissolved in water as an alkali. When bases and acids react, they form salts and water. Bases can turn red litmus into blue.
The acid reacts vigorously with most metals to form hydrogen. Acidic substances have pH of less than 7.
Learn more about acids and bases, here:
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what was the average speed of the car for the entire 8 hour trip?
Answer: we need sum more info
Explanation:
150+ miles or about 150+ if there on a highway 80+ if its a regualr road
Helppp plzzzz.......A motor home starts across a lake. The lake is 7 miles long and it takes 0.5 hours to get across. What is the speed? Write a formulae and show a label.
Calculate the parallel component of the weight of the object on the inclined plane below.
1. 0.87 N
2. 4.33 N
3. 24.5 N
4. 42.4 N
Answer:
4. Wx = 42.47[N]
Explanation:
In order to solve this problem, we must first make a free body diagram, of the forces acting on the body in the inclined plane.
As we can see in the attached image, the component of the weight parallel to the surface of the inclined plane can be obtained by the sine of the angle.
[tex]W_{x}=5*9.81*sin(60)\\W_{x}=42.47[N][/tex]
A wave with a frequency of 14Hz has a wavelength of 3 meters. At what speed will this wave travel
Answer:
frequency = 14 Hz
wavelength = 3 m
speed = ?
speed = frequency
x wavelength
speed = 14 x 3speed = 42 meter per second
Explanation:
How much power does a toaster have if it does 1,000 joules of work in 30 seconds?
Answer:
33.33Watts
Explanation:
Given parameters:
Work done = 1000J
Time taken = 30s
Unknown:
Power = ?
Solution:
To solve this problem, we must understand that power is the rate at which work is done.
So;
Power = [tex]\frac{Work done }{time}[/tex]
Now insert the parameters:
Power = [tex]\frac{1000}{30}[/tex] = 33.33Watts
Which two options describe behaviors of particles that are related to the
chemical properties of the materials?
A. Allowing electrons to move freely between them
B. Easily forming bonds with atoms of other elements
C. Changing their positions relative to one another
O
D. Combining with oxygen atoms to form a new substance
Answer:
B
Explanation:
When The conduct of particles is connected to the chemical properties of the materials. The two options are correct B and D.
What are Chemical Properties?
A property of a substance connecting to its chemical reactivity (as the incendiary effects of nitroglycerin).
Chemical stability and oxidation circumstances, different chemical properties include: Essentially, the chemical property is a differentia that may only be commemorated as an influence of a chemical reaction.
Therefore, The two correct options are B. Efficiently forming bonds with atoms of different elements and D. Converging with oxygen atoms to form a unique substance.
Find more information about Chemical Properties here:
https://brainly.com/question/17719190
I have been dehydrated 3 times in my life. Is it good or bad that I am going to start to drink 4 water bottles everyday now? FYI I am underweight.
Answer:
yes
Explanation:
because you will be hydrated
Answer:
Its good because you can survive without food but you cant survive without water. Extra water can replace empty, sugary calories many people drink with meals.
Explanation:
Question 1
A STUDENT TIES A STRING AROUND A WEIGHT AND SWINGS THE WEIGHT IN A CIRCLE AROUND HER BODY. IF
THE STUDENT REPRESENTS THE SUN AND THE WEIGHT REPRESENTS EARTH, WHAT DOES THE STRING
REPRESENT?
A. GRAVITY
B. RADIATION
C. ELECTRICITY
D. MAGNETISM
Answer:
A) Gravity.
Explanation:
Earth is stuck in orbit around the sun, because of the Sun's gravitational pull. In this scenario, the string represents gravity, keeping the Earth attracted towards the sun.
Hope this helps! Feel free to give me Brainliest if you feel this helped. Have a good day and good luck with your assignment :)
The student ties a string around a weight and swings the weight in a circle around her body. If the student represents the sun and the weight represents earth, the string will represent GRAVITY then.
What is gravity?In mechanics, gravity—also known as gravitation—is the constant force of attraction that pulls all things together. It has little impact on determining the intrinsic characteristics of common stuff because it is by far the weakest known force in nature.
In contrast, it governs the formations and evolution of stars, galaxies, and the entire cosmos by its extensive and ubiquitous action, which affects the trajectories of objects in the solar system and beyond the universe. All objects on Earth experience weight, or a gravitational pull that is proportionate to their mass and is imposed by the planet's mass.
As the student represents the sun and the weight represents earth, the string will represent GRAVITY then. Hence, option (A) is correct.
Learn more about gravity here:
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A bumble bee flaps its wings 5 times every second. What is the period of each wing flap?
Answer:
0.2 i beleive
Explanation:
1 divided by 5 is 0.2
Marco is conducting an experiment. He knows the wave that he is working with has a wavelength of 32.4 cm. If he measures the frequency as 3 hertz, which statement about the wave is accurate?
The wave has traveled 32.4 cm in 3 seconds.
The wave has traveled 32.4 cm in 9 seconds.
The wave has traveled 97.2 cm in 3 seconds.
The wave has traveled 97.2 cm in 1 second.
Answer: D. the wave has traveled 97.2 cm in 1 second.
Explanation:
Got it right on edge, hope this helps :)
Answer:
D
Explanation:
It is
What is double jeopardy
Answer:
the prosecution of a person twice for the same offense.
A car which is traveling at a velocity of 1.6 m/s undergoes an acceleration of 9.2 m/s over a distance of 540 m. How fast is it going
after that acceleration?
Answer:
Vf = 99.7 m/s
Explanation:
In order to find the final velocity of the car, we will use the third equation of motion. The third equation of motion is given as follows:
[tex]2as = V_{f}^{2} - V_{i}^{2}[/tex]
where,
a = acceleration of the car = 9.2 m/s²
s = distance traveled by the car = 540 m
Vf = Final Speed of the car = ?
Vi = Initial Speed of the car 1.6 m/s
[tex]2(9.2\ m/s^{2})(540\ m) = (V_{f})^{2}-(1.6\ m/s)^{2}\\V_{f}^{2} = 9936\ m^{2}/s^{2} + 2.56\ m^{2}/s^{2}\\\\V_{f} = \sqrt{9938.56\ m^{2}/s^{2}}[/tex]
Vf = 99.7 m/s
Helpppp helppp I will make you a brainlist!!
Answer:
The answer is that the evil psychic is merciless, see the explanation below:)
Explanation:
When a body is about to receive an impact or collision, two important factors should be taken into consideration; the mass of the body and the velocity with which it moves. The product of mass by velocity is defined as momentum.
Therefore:
[tex]P=m*v\\[/tex]
where:
P = momentum [kg*m/s]
m = mass [kg]
v = velocity [m/s]
That is, is we are standing in front of the truck:
[tex]P_{truck}=1000*1\\P_{truck}=1000[kg*m/s][/tex]
Or in front of the meatball:
[tex]P_{meatball}=1*1000\\P_{meatball}=1000[kg*m/s][/tex]
Cellular respiration occurs in every cell of our bodies. Through this process, we obtain the
energy we need for life. During cellular respiration, oxygen helps in breaking down sugar
molecules into carbon dioxide and water molecules. Which reaction correctly represents the
cellular respiration process? (1 point)
Answer:
1)The reactants are unlit charcoal, and the products are charcoal that has already burned and released its energy.
2)sugar + oxygen → carbon dioxide + water + energy
3)iron + oxygen → rusted iron + energy
4)an endothermic reaction, because ice absorbs heat to become liquid water
5)The temperature of the reactants is greater than the temperature of the products.
Explanation:
100%
What accommodations can be made for people with impaired vision?
Kylee is running on the track. She starts off at the 200m line and runs to the 800 m line. She realizes she forgot her watch so she turns around and runs to the 450m line when she realizes it was in her pocket. What was her total displacement?
Answer:
250m towards the starting point
Explanation:
Displacement is the distance from start to finish with directional orientation of a body.
Start Finish
200m → 800m
←
450m
Her total displacement would be = 450m - 200m = 250m
Displacement is therefore 250m towards the starting point
Can somebody mee plzzz?
Answer: I think the answer is d
Explanation:
Light is refracted as it crosses the air-water.
Hope it helps :)