Please I need help with this question (see image).
Show workings where necessary.
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Answer:
Qúéßtîóñ : A quantity of pepper soup of mass 800g poured into a plastic container with a tight fitting lid has a temperature of 30oC. The container is then placed in a microwave oven, rated 1200 W and operated for3 minutes.
(i) Calculate the final temperature attained by the soup. (Assuming no heat losses)
Àñßwër : Pt = mc
1200 x 3 x 60 = x 4000 x
= 67.5o
Final temp = 67 . 5o + 30o
= 97.5oC
(ii) Explain why containers with tight-fitting lids are not suitable for use in microwave cooking.
Àñßwër : The molecules of the steam from the content are confined within the container. As the temperature increases the rate of collision of the molecules with walls of the container increases, thus the pressure inside the container increases. If it is tightly fitted, the pressure can make the container burst thus releasing its hot content.
(iii) When the soup is brought out and allowed to cool, a dent was observed on the container. Explain.[ Take specific heat capacity of the soup = 4000 Jkg-1 K-1 ]
Àñßwër: The container will dent because the condensation of the steam in the container will lead to a decrease in pressure in the container making the atmospheric pressure greater than the pressure in the container.
Explanation:
______❤️ hope it helps you ❤️________Related Questions
Hello help me please! (*8* Points!) How can the potential energy of a bicycle stopped at the top of a hill be changed into kinetic energy?
Answers
Answer:
If the bicycle went down the hill, because if you are at the top of the hill, that is potential energy, when you start going down, it is turned into kinetic energy. Makes sense?
Explanation:
An electromagnet is a solenoid with a piece of ferromagnetic material within it.
Please select the best answer from the choices provided
OT
O F
Answers
The answer will be OT
Find the KE of a ball of mass 500 g moving with a velocity of 4 m/s . Plz fast i have just 5 mins
Answers
Answer:
4000 J
Explanation:
KE = (1/2)(m)(v^2)
KE = .5*500*(4^2)
KE = 4000 J
PLEASE ANSWER QUICKLY
Which of the following best describes the make up of a star?
Answers
•a collection of particles held together by gravity
•a body in orbit
•a cloud of dust and gas
•a luminous ball of plasma
Answers
Answer:
a luminous ball of plasma
True or false Carbon in the form of carbon dioxide is needed for both processes of photosynthesis and cellular respiration True False
Answers
Yes carbon dioxide is needed for photosynthesis while cellular respiration needs oxygen and dispurses carbon dioxide
Determine the gradient of a slope that starts at an elevation of 85 meters and ends 15 km away at an elevation of 10 m.
Answers
Answer:
Explanation:
To calculate the gradient we can use the equation for it, which is:
change in field value / distance = gradient
Since we already know the values, we can directly go with the calculation. The change in field value is 55 m - 15 m = 40 m, and we will need to convert the 20 km into meters, so we will have 20,000 m.
40 / 20,000 = 0.002
So the gradient of the suggest slope will be only symbolic 0.002 degrees.
Which type of wave interaction is shown in the diagram?
The answer is Constructive interference
Answers
Answer:
The answer is Constructive interference
Explanation:
cause you said so
Answer: The answer is Constructive interference
Explanation:
You said the answer.
Please help me I will give you 20 points !!
You read a primary source and a secondary source that discuss the same
experiment. There is a difference in the conclusions made by these two
sources. Which should you trust more, and why?
O A. The secondary source, because it was printed on paper
B. The secondary source, because it is easier to understand
O C. The primary source, because it contains more charts
O D. The primary source, because it was written by the researcher
Answers
Answer:
D. The primary source, because it was written by the researcher
Explanation:
One should learn to trust the primary source more because it is the real work of the researcher.
A primary work defines the work of research from his or her experimental findings.
The primary source presents experimental data and other subordinates ones to reach a conclusion as seen from the view of the researcher. A secondary source implies someone else documenting their own opinion about the primary experimental set up. This can get dicey in the sense that results can be twisted to serve other ulterior motives.what did the hand say to the face?
Answers
Answer:
im not sure what did it say
Explanation:
hmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm
Why will air sink if it is colder than the air around it?
Answers
Answer:
The molecules in hot air are moving faster than the molecules in cold air.
(the answer is not 0.482)
Answers
Don’t know if it’s right or not.
If you went up in an elevator to the top of a 50m building then came back down, determine these quantities:
Distance at the top:
Displacement at the top:
Distance when down:
Displacement when down:
Answers
If you walked into the building with your cup of coffee at 8:00 in the morning, took a ride up and down on the elevator for fun, and then went home, then ...
When you got to the top:
... Your distance covered = 50 meters
... Your displacement since you started = 50 meters up
When you returned to the bottom:
... Your total distance covered = 100 meters
... Your displacement since you started = zero
Answer:
If you walked into the building with your cup of coffee at 8:00 in the morning, took a ride up and down on the elevator for fun, and then went home, then ...
When you got to the top:
... Your distance covered = 50 meters
... Your displacement since you started = 50 meters up
When you returned to the bottom:
... Your total distance covered = 100 meters
... Your displacement since you started = zero
Explanation:
Please help me!
Neutral atoms of oxygen with a mass of 15 are frequently used in brain imaging technology. Could the atom symbol below be used in this process? Why or why not?
Answers
Answer: No, because the atomic number shown in the symbol (Z = 15) is not the atomic number of oxygen (Z = 8)
Explanation:
When we have an atom, the number in the top left is the mass number A, is equal to the sum between the number of neutrons and protons in the atom.
In this case, between protons and neutrons, we have 32.
The number at the bottom left is the atomic number Z, which is equal to the number of protons in the atom.
Particularly, this number is different for every element. For example, for the oxygen we would have Z = 8, this means that the oxygen has 8 protons.
In the image, we can see Z = 15, then the atom has 15 protons, this means that it can not be oxygen (Z = 15 is for phosphorus, then this atom would be phosphorrs). Then the symbol can not be used, because that is not oxygen.
lighting is blank A.a build-up of neutrons B.harmless if you don't hear thunder C.a large discharge of static electricity D.a low-voltage current
Answers
Answer:
C
Explanation:
lightning is an electrostatic discharge
Females are the only gender capable of suffering from an eating disorder.
A. true
B. false
Answers
That’s false!!
Question 6 of 10
In which three ways does the pattern seen on the screen during a double-slit
experiment support the wave model of light?
A. All of the light that enters the slits passes through them.
I B. There are bands of dimmer light.
C. There are bands of brighter light.
I D. The light bends around the edges of the slit.
Answers
Answer:
Explanation:
find -7a + 3b gtytfvnhfcfgc
Answers
Answer:
what ahwhwhqqwwshwh# wvw
Explanation:
I dont think you can factor that.
f the same amount of force is applied to objects of different mass, (0.5, 1, 2, 5, 10, 20 kg.) will the objects all move at the same or different speeds?
Answers
Answer:
An object's velocity will only remain constant in the absence of any forces or if the forces ... The pendulum doesn't move because all the forces cancel each other out (add ... Note that an object that has a mass of one kilogram on earth would have a ... frames of animation
Explanation:
Atoms with a low ionization energy give up their outer valence electrons with
ease.
O A. True
O B. False
Answers
Answer:
a. true
Explanation:
i think
that my answer
Un movil viaja a 40km/h y comienza a reducir su velocidad a partir del instante t=0. Al cabo de 6 segundo se detiene completamente. ¿Cuál fue aceleración durante el periodo en el que redujo su velocidad?
Answers
Answer:
1,85 m / s²
Explanation:
De la pregunta anterior, se obtuvieron los siguientes datos:
Velocidad inicial (u) = 40 km / h
Hora inicial (t₁) = 0
Tiempo final (t₂) = 6 s
Velocidad final (v) = 0
Aceleración (a) =?
A continuación, convertiremos 40 km / ha m / s. Esto se puede obtener de la siguiente manera:
1 km / h = 0,2778 m / s
Por lo tanto,
40 km / h = 40 km / h × 0,2778 m / s / 1 km / h
40 km / h = 11,11 m / s
Por tanto, 40 km / h equivalen a 11,11 m / s.
Finalmente, determinaremos la aceleración del móvil durante el período en el que desaceleró. Esto se puede obtener de la siguiente manera:
Velocidad inicial (u) = 11,11 m / s
Hora inicial (t₁) = 0
Tiempo final (t₂) = 6 s
Velocidad final (v) = 0
Aceleración (a) =?
a = (v - u) / (t₂ - t₁)
a = (0 - 11,11) / (6 - 0)
a = - 11,11 / 6
a = –1,85 m / s²
Por tanto, la aceleración del móvil durante el período en el que se ralentizó es de –1,85 m / s²
if you drive at a speed of 63.2 miles/hour for 7.5 hours, how far will you go
Answers
Answer:
474 miles
Explanation:
63.2 x 7.5 = 474
A fruit smoothie requires 14 blueberries for every 5 strawberries. How many blueberries would be needed if you were using 15 strawberries?
Answers
Answer:42
Explanation:
15/5= 3
3x14= 42
Answer:
42 blueberries 5x3=15 14x3=42
Explanation:
Kyle runs 20 m north, 20 m west and then 20 m south, what is Kyles’s total displacement?
Answers
Answer:
Displacement = 20 m
Explanation:
Given that,
Kyle runs 20 m north, 20 m west and then 20 m south.
We need to find Kyles's total displacement.
Total distance = shortest path covered by Kyles.
The net displacement of Kyle is 20 m in east direction. Hence, this is the required solution.
HELPPPPP!!!!! ME PLSSSS I don't know the answer!!!****URGENT****
Answers
Answer:
D is the Answer
Explanation:
I know D is the answer because I calculated it and got answer choice D
Hi I need help with this question (see image ). Please show workings. If necessary.
Answers
Answer:
Answer
Advantages of alcohol over Mercury
(a) Freezing point of alcohol is −117∘
C and hence can record very low temperature For example in Arctic and Antarctic regions temperature may fall below −80∘
C which cannot be measured by mercury thermometer because mercury freezes at−39 ∘ C
(b) The expansion of alcohol per degree rise in temperature is much more around six times more then that of mercury and hence is more sensitive
(c) it can be coloured brightly by adding some dye in it and hence is easily detectable
3. A car does an emergency stop from 144 km\h in 4s
What was its deceleration?
Answers
Answer:
36?
Explanation:
When a rubber band is pulled back all the way it has what type of energy?
Answers
Answer:
Potential energy
Explanation:
What factor affects weight( what force causes weight to change)
Answers
Answer:
Gravitational force affects weight, weight changes with change in gravity
Hope it helped u,
mark as the brainliest
^_^
Which of the following examples would be a physical change? (2 points)
a. Baking a cake
b. Boiling water
c. Burning wood
d. Lighting fireworks
Answers
What is the best snack
Answers
Answer:
Cheetos, takis, and doritos
Explanation:
Fruit bars
Explanation:
they ate healthy and tasty. they have them at costco