Answer:
The Cell Membrane is found in both plant and animal cells.
Explanation:
Chloroplast, Large Vacuole and Cell Wall are all found in plant cells.
1. Why is the flow of electrons from A to B?
2. What's the difference between flow of current & flow of electrons and why ar they opposite?
1. because A is more negative than B. A is -1000 V (we can imagine that A has excess 1000 electrons), in other, B which +3000 V can be assume that B need 3000 elctrons to be neutral. So, the electron will flow from A to B.
2. Electrons being negatively charged flow from the negative terminal to the positive terminal of the voltage source. So, the actual direction of current should be from negative to positive terminal. However, the conventional direction had already been established. So, the current flow is considered in the direction opposite to the direction of flow of electrons. (from topperlearning dot com)
Can you help me please here is the picture DUE NOW PLEASE.
they are formed when hot
it's dependent on the rate of cooling of the melt, slow cooling allows large crystals to form, fast cooling yields small crystals. They cool too quickly to form crystals.
Hope this helps! <3 :3
Consider the following water circuit: water is continually pumped to high pressure by a pump, and then funnelled into a pipe that has lower pressure at its far end (else the water would not flow through the pipe) and back to the pump. Two such circuits are identical, except for one difference: the pipes in one circuit have a larger diameter than the pipes in the other circuit. Through which circuit is the flow of water greater
Answer:
The circuit with the larger diameter pipes will have higher water flow.
Explanation:
The flow rate can be calculated with this formula, [tex]Q = v.A[/tex] , where [tex]v[/tex] is the velocity of the water flow and [tex]A[/tex] is the cross-sectional area of the pipe. Considering the two circuits are identical except only for the diameter of the pipes, the flow of water will be greater through the circuit with the larger diameter pipes. It will be proportional with respect to the square of the pipe's diameter.
I hope this answer helps.
The gravitational strength at the poles is greater than the gravitational strength at the equator. What will happen to an object when it moves from the poles to the equator? Group of answer choices A. Its mass will increase. B. Its mass will decrease. C. Its weight will increase. D. Its weight will decrease.
Answer:
C
Explanation:
Because this same question was on my test last week and I got it correct
(a) The roof of a large arena, with a weight of 290 kN, is lifted by 30 cm so that it can be centered. How much work is done on the roof by the forces making the lift? (b) In 1960 a Tampa, Florida, mother reportedly raised one end of a car that had fallen onto her son when a jack failed. If her panic lift effectively raised 4000 N (about 1/4 of the car's weight) by 5 cm, how much work did her force do on the car?
Answer:
87000 J ;
200 J
Explanation:
Workdone = mgh
Weight = mg = 290kN = 290 * 1000=290000 N
h = distance = 30 cm = 0.3 m
Workdone = 290000 * 0.3
Workdone = 87000 J
B.)
Workdone = Force * distance
Force = 4000 N
Distance, d = 5 cm = 0.05 m
Workdone by the woman, W = 4000N * 0.05m
W = 200Nm = 200 J
A sound having a frequency of 299 Hz travels through air at 332 m/s.
What is the wavelength of the sound? Answer in units of m.
Answer:
1.11 m.
Explanation:
Why?
The speed for a wave is done by the equation: v = f * w. Because the frecuency tells us about how many cycles the wave makes each time, but for each cycle the wave runs certain distance, given for the wavelenght. If you isolate the letter w you get the value just doing a ratio.
v = speed
f = frecuency
w = wavelenght
w = v / f
g A nucleus of mass M (given) at rest emits an alpha particle. The kinetic energy of the alpha particle is K1 (given). The mass of the alpha particle is given (m1) and the mass of the daughter nucleus is also given (m2). a) write the nuclear reaction equation; b) express the kinetic energy of the daughter nucleus in terms of the given quantities c) express the Q factor of this reaction in terms of the given quantities.
Answer:
Following are the responses to the given question:
Explanation:
In point a:
Nucleus denoting, he refers to those same nuclei of the helium ( that is alpha particle)
[tex]{z}^{N^{A}}\to z-2^{N^{A-4}} + 2^{He^{4}}[/tex]
In point b:
Let the kinetic energy of [tex]\alpha[/tex] particle = [tex]K_1[/tex]
[tex]\to K_1 = \frac{mass \times (velocity)^2}{2}[/tex]
The velocity of [tex]\alpha[/tex] particle [tex](v_1)= (2 \times \frac{k_1}{m_1})^\frac{1}{2}[/tex]
Let daughter core velocity be =[tex]v_2[/tex]
Preserving linear acceleration since there was no external factor we can write
[tex]\to m_2 \times v_2 = m_1 \times v_1\\\\\to v_2 = \frac{m_1\times v_1}{m_2}\\\\\to v_2 = \frac{m_1\times (2 \times \frac{k_1}{m_1})^{\frac{1}{2}}}{m_2}[/tex]
Daughter nuclei energy can be written as:
[tex]\to \frac{mass \times (velocity)^2}{2}\\\\\to \frac{m_2 \times (m_1)^2 \times 2 \times k_1}{(2\times m_1 \times (m_2)^2)}\\\\ \to (\frac{m_1}{m_2}) \times k_1[/tex]
In point c:
Initial weight = M
Total product weight [tex]= m_1 + m_2[/tex]
You can use the total release energy (Q-factor) as =[tex](M - (m_1+m_2)) c^2[/tex]
A planet follows an elliptical orbit that brings it as close as 21 million km to a star and as far as 75 million km from the star. At both of these locations the velocity of the planet makes a right angle to the direction to the star. If the planet's speed is 38 km/s when it is farthest from the star, how fast is it moving when it is closest to the star
Answer:
Explanation:
In an elliptical orbit , the angular momentum of the planet remains constant because velocity of planet makes a right angle to the direction to the star .
mvr = constant .
mv₁r₁ = mv₂r₂
v₁r₁ = v₂r₂
v₁ x 21 = 38 x 75
v₁ = 135.71 km/s .
10. A 50 kg bicyclist on a 10 kg bicycle speeds up from 5.0 m/s to 10 m/s.
(a) What was the total kinetic energy before accelerating? Full working out
Answer:
T.K.E = 750 Joules.
Explanation:
Given the following data;
Initial velocity, u = 5m/s
Final velocity, v = 10m/s
Mass of bicyclist = 50kg
Mass of bicycle = 10kg
Total mass, Tm = 50 + 10 = 60kg
Kinetic energy can be defined as an energy possessed by an object or body due to its motion.
Mathematically, kinetic energy is given by the formula;
[tex] K.E = \frac{1}{2}mv^{2}[/tex]
Where;
K.E represents kinetic energy measured in Joules.
m represents mass measured in kilograms.
v represents velocity measured in metres per seconds square.
To find the total kinetic energy before accelerating simply means the kinetic energy due to the initial velocity and total mass;
[tex] T.K.E = \frac{1}{2}T_{m}U^{2}[/tex]
Substituting into the equation, we have;
[tex] T.K.E = \frac{1}{2}*60*5^{2}[/tex]
[tex] T.K.E = 30*25 [/tex]
T.K.E = 750 Joules.
PLEASE HELP!!!
Thunder is a sound wave created
by a lightning strike. If it travels at
343 m/s, how much time does it
take to travel a mile (1610 m)?
(Unit = s)
Answer:
t = 9.38 s
Explanation:
Given that,
The speed of the sound wave, v = 343 m/s
Distance, d = 1610 m
We need to find the time taken to travel a mile. The distance traveled by the sound is 2d. Using the formula for speed,
[tex]v=\dfrac{2d}{t}[/tex]
t is the time taken to travel a mile
So,
[tex]t=\dfrac{2d}{v}\\\\t=\dfrac{2\times 1610}{343}\\\\t=9.38\ s[/tex]
So, it will take 9.38 seconds.
Answer:
4.69s
Explanation:
The formula to find time is time = distance / velocity
Plug the numbers into the formula
So
1610 / 343
= 4.69s
8.A catcher puts out his mitt and catches the BASEBALL BALL. Is the work
done on the BASEBALL BALL positive or negative?
O a. positivie
O b. negative
Answer:
The catcher does negative work on the ball because the force exerted by the catcher is opposite in direction to the motion of the ball.
Explanation:
HELP!!! 100 POINTSSS!!!
Answer:
3
Explanation:
From the question given above, the following data were obtained:
Length (L) = 3 m
Height (H) = 1 m
Mechanical advantage (MA) =.?
The ideal mechanical advantage for the system can be obtained as follow:
MA = L/H
MA = 3/1
MA = 3
Therefore, the ideal mechanical advantage for the system is 3
Answer:
Explanation:
Mechanical Advantage is the ratio of Input Distance / Output Distance.
In this case, the output distance is to bring up the cart by 1m.
The input distance is to push the cart by 3m.
Assume an ideal machine, MA = 3/1 = 3
2.A child moving at constant velocity LIFTS a 2 N ice-cream to the top
shelf of a refrigerator. Is work being done?
O a. No
O b. Yes
what role if any does air resistance have on your results
what causes moon phases, rotation or revolution
Answer:
The Moon's monthly
cycle of phases
results from the
changing angle of
its illumination by the Sun.
Because its period of
revolution is the same as its
period of rotation, the Moon
always keeps the same face
toward Earth.
Everything is made of tiny atoms. Each of these atoms is made up of a core that has a positive charge, and some electrons that circle around the core. These have a negative charge. When these electrons move around in a substance and between substances, an _______________ is created.
even charge
uneven charge
plsssssssssss answer correct i am not trying to be mean but correct answers only plsssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssss
Answer:
uneven
Explanation: :)
Answer:
uneven charge, b
Explanation:
If an engine cannot be 100%
efficient, what happens to the
energy that is lost?
A. It disappears.
B. It reproduces.
C. It still exists, but in a different form.
Answer: Given the evidence in the explanation, I'm pretty sure it's C. It still exists, but in a different form.
Explanation: "Some part of the energy supplied is used to change the internal energy of the system. Some part is also released into the surroundings. Generally, frictional losses are more predominant for the machines being not 100% efficient. This friction leads to the loss of energy in the form of heat, into the surroundings."
Outline 3 disadvantages and advantage of water and alcohol as a template liquid
Answer:
Advantages of mercury as a thermometric liquid.
-It is a good conductor of heat and therefore the whole liquid reaches the temperature of the surroundings quickly.
-It does not wet (cling to the sides of) the tube.
-It has a high boiling point
-It expands uniformly (linear expansion) and responds quickly to temperature changes, hence is sensitive.
-It has a visible meniscus.
Disadvantages
-Mercury is very poisonous.
-its expansively is fairly low
-it is expensive
-It has a high freezing point therefore it cannot be used in places where the temperature gets very low.
Alcohol has a thermometric fluid
-Alcohol expands uniformly.
-It has a low freezing point (-115 degreecentigrade) therefore it is very suitable for place where the temperature gets very low.
-It has a large expansively
-It is an easily available cheap liquid, which is safe to use
Disadvantages of alcohol
-it wets the tube
-it has a low boiling point (cannot be used in places with high temperatures)
-it does not react quickly to changes in temperature
-It needs to be dyed, since it's colourless.
Disadvantages of water
-Water has high specific heat capacity. So it cannot be used for measuring small temperature differences.
- Water will wet the surface of the glass tube. It is a sticky substance.
- Water is transparent
Explanation:
PLEASE HELP ME WITH THIS ONE QUESTION
How many joules are needed to vaporize 125 g of liquid water at 100°C? The latent heat of vaporization is 2258 J/g.
Answer:
Q = 282,000 J
Explanation:
Given that,
The mass of liquid water, m = 125 g
Temperature, T = 100°C
The latent heat of vaporization, Hv = 2258 J/g.
We need to find the amount of heat needed to vaporize 125 g of liquid water. We can find it as follows :
[tex]Q=mH_v\\\\Q=125\ g\times 2285\ J/g\\\\Q=282250\ J[/tex]
or
Q = 282,000 J
So, the required heat is 282,000 J .
Which phrase best completes the diagram?
Role of the Federal Reserve in the U.S. economy:
Sets interest rates➡️?➡️Loans money to other banks
A. Approves the federal budget.
B. Votes on coporate regulations.
C. Sets the consumer price index.
D. Makes rules for other banks.
Correct answer is:
D. Makes rules for other banks.
Answer:
B
Explanation:
i think
Answer:
D. makes rules for other banks
Explanation:
What could you do to increase the electric potential energy between two
negatively charged particles by a factor of 16?
O A. Increase the charge of one particle by a factor of 4.
B. Reduce the charge of one particle by a factor of 4.
C. Increase the charge of one particle by a factor of 16.
O D. Reduce the charge of one particle by a factor of 16.
Answer: Increase the charge of one particle by a factor of 16
Explanation:Just took the quiz
Answer:
C. Increase the charge of one particle by a factor of 16.
I need help with 6 and 7 please help?
Answer:
6-a . 7-c
Explanation:
Four blocks, each with the same volume, are submerged in a vat of oil. Which of the blocks will have have the largest buoyant force?
A: .5 kg styrofoam block
B: 5 kg lead block
C: 2 kg aluminum block
D: 4 kg steel block
E: All have the same buoyant force
A 70 ft rope hangs from a helicopter above this room. The rope has a mass per unit length of 2 lb/ft. In order to be rescued from this exam the helicopter must pull you up and out of the room to safety. Assume that you weigh 120 lbs. How much work will it take get you safely away from this test
Answer:
The work done to get you safely away from the test is 2.47 X 10⁴ J.
Explanation:
Given;
length of the rope, L = 70 ft
mass per unit length of the rope, μ = 2 lb/ft
your mass, W = 120 lbs
mass of the 70 ft rope = 2 lb/ft x 70 ft
= 140 lbs.
Total mass to be pulled to the helicopter, M = 120 lbs + 140 lbs
= 260 lbs
The work done is calculated from work-energy theorem as follows;
W = Mgh
where;
g is acceleration due gravity = 32.17 ft/s²
h is height the total mass is raised = length of the rope = 70 ft
W = 260 Lb x 32.17 ft/s² x 70 ft
W = 585494 lb.ft²/s²
1 lb.ft²/s² = 0.0421 J
W = 585494 lb.ft²/s² = 2.47 X 10⁴ J.
Therefore, the work done to get you safely away from the test is 2.47 X 10⁴ J.
Within which type of system is the total energy conserved?
A. Isolated
B. Connected
C. Closed
D. Open
The total energy is conserved within isolated system.
How is energy conserved in an isolated system?In an isolated system, there is no exchange of matter or energy with the surroundings. Therefore, the total energy within the system remains constant, meaning that energy is conserved within the system.
In contrast, in an open system, there can be an exchange of both matter and energy with the surroundings, so the total energy within the system is not necessarily conserved.
In a closed system, there can be an exchange of energy but not matter, so the total energy within the system is conserved as long as there is no work being done by or on the system. In a connected system, the term is not commonly used in the context of energy conservation.
Learn about isolated system here https://brainly.com/question/17580023
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A barrel contains 285 kg of water.
What is the volume of the water?
(Unit = m^3)
Answer:
285 Litre ( 1kg of water occupies 1 Litre )
which is identical to 285 dm^3 ie 285 cubes of length 10 cm
and as there are 10 of these linearly in 1 m then there are 10^3 = 1000 dm^3 in each m^3
giving a volume of 0.285 m^3
Of course if you KNEW that 1m^3 of water has a mass of 1000 kg then you would simply have said that the volume was 285/1000 m^3
The volume of the water will be 0.285 [tex]m^{3}[/tex]
What is volume ?A volume is simply defined as the amount of space occupied by any three-dimensional solid. These solids can be a cube, a cuboid, a cone, a cylinder or a sphere. Different shapes have different volumes. Volume is the measure of the capacity that an object holds.
A method in which the value of the unit (one) quantity is first obtained to find the value of any required quantity is called the unitary method. So , by finding the value volume of 1 kg water , we can find the volume of 285 kg water by simply multiplying it with the volume of 1kg water using unitary method
using unitary method
1000 kg of mass have volume of = 1[tex]m^{3}[/tex]
then , the volume of 1kg will be = 1 / 1000 [tex]m^{3}[/tex]
The volume of 285 kg will be = (1 / 1000) * 285 = 0.285 [tex]m^{3}[/tex]
Hence if a barrel contains 285 kg of water, then the volume of the water will be 0.285 [tex]m^{3}[/tex]
To learn more about volume here
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The work done per unit volume is?
Answer:
hahsbahbavbsbsbaba avabshshshbabahsjsjajajjajajjajjaja
3. Which of the following processes provides the water necessary for human consumption?
O precipitation
O evaporation
O sublimation
O perspiration
Answer:
precipitation is the answer..
Explanation:
precipitation is any product of the condensation of atmospheric water vapor that falls under gravitational pull from clouds. The main forms of precipitation include drizzling, rain, sleet, snow, ice pellets, graupel and hail.
A car starting from rest is accelerated uniformly to a velocity of 100.8km/h. Convert this to metre per secondphy
Explanation:
100.8 km/h × (1000 m/km) × (1 h / 3600 s) = 28 m/s
Answer:
28 m/s
Explanation:
100.8km/hr * 1hr/3600sec* 1000m/km= 100.8*1000/3600 m/s
A car of mass 1800 kg can be just be lifted. What is the least force that the electromagnet must use to lift the car? (1 g = 10 N/kg)
Answer:
f=a×mm=1800kg
1800000g×10N/kg
18000000N force is required to life the car
