If an object is placed 50 cm in front of a concave mirror of 60 cm radius, what is the image size if object size is 15cm?
Answer:
V=22.5cm
Explanation:
So.. This is science.. I would ask the kids from my school but I have no friends and I don't know any of them.
Answer:
8 N force
Explanation:
12 N forward, 4 N backwards
12-4=8
Anyone knows this? Please answer... Spam will be reported.
Answer:
The correct option is;
The assertion is correct, but reason wrong
Explanation:
The question is with regards to the relationship between work, energy, power, and velocity
The mass of each of the persons running up the staircase = Different
The time it takes each person to run up the stairs = Equal time
Let, 'm₁' and 'm₂' represent the mass of each of the persons that ran up the stairs and m₁ > m₂
Let 't' represent the equal time it takes then to run up the stairs
Let 'h' represent the height of the stairs
The energy, 'E', it takes to run up the stairs is equal to the potential energy, P.E., obtained at the top of the stairs
P.E. = m·g·h
Where;
m = The mass of the person at an elevated height
g = The acceleration due to gravity = Constant
h = The height reached above ground level
Given that the height reached is the same for both of the persons, we have
For m₁, P.E.₁ = m₁·g·h and for m₂, P.E.₂ = m₂·g·h
Therefore, where, m₁ > m₂, we have;
P.E.₁ > P.E.₂
∴ E₁ > E₂
Power, 'P', is the rate at which energy is expended
∴ Power, P = E/t
∴ P₁ = E₁/t > P₂ = E₂/t
Therefore, the person with the greater mass, 'm₁', uses more power than the person of mass 'm₂', in running up the stairs
Therefore, the assertion is correct
The average velocity, vₐ = (Total distance traveled, d)/(Total time taken, t)
Given that the distance, 'd', covered in running up the stairs by both persons is the same, and the time it takes them to complete the distance, 't', is also the same, we have;
The average velocity of the person with the greater mass m₁ is the same as the average velocity of the person with mass, m₂
Therefore, the reason is wrong
The answer is that the assertion is correct, but reason wrong
Heat can be transferred through conduction, convection, and radiation. What is necessary in order for heat to be transferred by conduction?
A.
Heat must be transferred through space.
B.
Heat must be transferred in the form of currents.
C.
The substances must be liquids or gases.
D.
The objects must be in direct contact with one another.
it would be..... C
sorry if I am wrong I tryed to think, At least I try!
What are the relationships between pressure force and area?
Answer:
(b) Pressure= Area\Force
Explanation:
(a) Pressure is the force acting perpendicularly on a unit area of the object.
(b) Pressure= Area\Force
(c) Pressure on an area of 10 m^2
Force = 200 N
Pressure = 200\10 = 20Pa
(ii) Pressure of an area 5m^2
Force = 200 N
Pressure = 200\5 = 40Pa
If helpful, please mark as brainliest! =)
Need help as fast as possible please
Thank you!
Answer:
b is the answer.. hope it helps
If the speed of sound in air is 340 m/s, approximately how long will it take the sound of a clap of thunder to travel 2 kilometers?(1 point)
5.9 seconds
3.4 seconds
2.9 seconds
1.7 seconds
Answer:5.9 Seconds
Explanation: I just took the quiz
The sound of a clap of thunder take 5.9 seconds to travel 2 kilometers.
To determine the correct statement among all the options, we need to know about the relation between speed and time.
What is sound speed?The speed of sound is the distance travelled by sound per unit time Mathematically, it is v=distance/time= 340m/s.What's is the time taken by sound to travel 2 km?We found 340m/s=distance/time. So, time = distance/340= 2000m/340= 5.9 s.Thus, we can conclude that the sound of a clap of thunder take 5.9 seconds to travel 2 kilometers.
Learn more about sound speed here:
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why do you think people translate sound waves from compression waves to transverse waves ?
Answer:
Sound waves are translated into transverse waves to know the frequency, amplitude, wavelength etc of the waves.
Explanation:
They translate the sound waves to know the depth about that specific waves and translating it to transverse waves makes it easier.
Hope it helps :D
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Date :
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What is the physical meaning of emissivity write its unit
Answer: a measure of the ability of a surface to radiate energy; the ratio of the radiant flux emitted per unit area to that emitted by a black body at the same temperature.
Explanation: hope that helped! (:
Which diagram shows the pattern of magnetic field lines around a bar magnet?
Answer:
d
Explanation:
Question 19 of 20
Planets A and B have the same size, mass, and direction of travel, but planet
A is traveling through space at half the speed of planet B. Which statement
correctly explains the weight you would experience on each planet?
A. You would weigh less on planet B because it is traveling twice as
fast as planet A.
B. You would weigh the same on both planets because your mass
would adjust depending on the planet's speed.
O C. You would weigh more on planet B because it is traveling twice as
fast as planet A.
D. You would weigh the same on both planets because their masses
and the distance to their centers of gravity are the same.
SUBMIT
Answer:
D. You would weigh the same on both planets because their masses
and the distance to their centers of gravity are the same.
Explanation:
The above statement is true due to the fact that, the weight and masses of the individual are same in direct comparison with the distance to their center of gravity. If the weight and masses are not same, then there would have been a significant difference between the two planet.
Which one of the following best describes a fuse?
a bicyclist travels with an average velocity of 15 km per hour for 20 minutes what is his displacement in kilometer
Answer:
5 kilometers
Explanation:
Velocity= 15km/h
Time= 20 minutes = 1/3 hours
Displacement= Velocity x Time
= 15 x 1/3
= 15/3
= 5km
1. What happens when like magnetic poles are brought close together?
Answer:
They repel from each other
Explanation:
Answer:
It is also observed that, magnets attract as well as repel. We can explain this dual nature of magnetic force by proposing that each magnet has two poles, north pole (N) and south pole (S). You will observe two things during the activities:
1) When two magnets are brought near each other, like poles repel; opposite poles attract.
2) When a magnet is brought near a piece of iron, the iron also gets attracted to the magnet, and it acquires the same ability to attract other pieces of iron.
things plants make during photosynthesis
Answer:
glucose
Explanation:
convert starch to glucose
Answer:
During the process of photosynthesis, cells use carbon dioxide and energy from the Sun to make sugar molecules and oxygen. These sugar molecules are the basis for more complex molecules made by the photosynthetic cell, such as glucose.
I hope it's helpful!
Can anybody answer this question. Please...
AIBr+ __K__KBr + __AI
Answer:
1AlBr3+ 3K ---> 3KBr + 1Al
Explanation:
When a 40V battery is connected across an unknown resistor there is a current of 100 ma in the circuit.
Find the value of the resistance of the resister:
Answer:
R = 400 ohms.
Explanation: Voltage of the battery, V = 40 V. Current in the unknown resistor I = 100mA. Let R is the resistance of the resistor. It can be calculated using Ohm's law it gives the relationship between the voltage, resistance and current.. R = V/I. R = 40 V/10-¹A. R = 400 Ohm's. So, the value of the resistance of the resistor is 400 Ohm's
ANSWER QUICK PLEASE!!! (WORTH 15 POINTS!)
Kellie is hopping on one foot. Kellie has a mass of 650
newtons and her foot has an area of 0.10 m2.
How much pressure is exerted by her foot on the ground
with each hop?
Answer:
650 N / 0.10 m2 = 6500 Pa
Explanation:
The pressure that could be exerted on the ground with each top should be 6,500 Pa
Given that,
The mass is 650 newtons.The area should be 0.10m^2We need to determine the pressure.
So, the following formula should be used.
[tex]= \frac{Mass}{area}\\\\= \frac{650}{0.10} \\\\[/tex]
= 6,500 Pa
Therefore we can conclude that the pressure that could be exerted on the ground with each top should be 6,500 Pa.
Learn more about the pressure here: brainly.com/question/23358029
Which vector has a y-component with a length of 3?
A. C
B. d
C. a
D. b
Answer:
Option C : a
Explanation:
if the battery is a 9-volt battery and the resistance in the circuit is 18 ohm's how much current is flowing through the circuit
Answer:
0.50 A
Explanation:
According to the formula, V = IR
9 = I×18
I = 9/18
I = 0.50
If the battery is a 9-volt battery and the resistance in the circuit is 18 ohm's then the current is flowing through the circuit would be 0.5 Ampere.
Resistance is the obstruction of electrons in an electrically conducting material.The mathematical relation for resistance can be understood with the help of the empirical relation provided by Ohm's law.
V=IR
Where V is the voltage
Where I is the current
Where R is the resistance used in the circuit
As for the given problem if the battery is a 9-volt battery and the resistance in the circuit is 18 ohm
By using the ohms
V=IR
By substituting the respective value of voltage and resistance
Voltage is 9 volt in the resistance is 18 ohm
9V = 18*I
I= 0.5 Ampere
Thus, the current flowing through the 9 V battery and a 18 Ohm resistor is 0.5 Ampere.
Learn more about resistance from here
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Can a physical quantity have units but still be dimensionless?
Answer:
yes
Explanation:
there are other quantities that are dimensionless, but have a unit.
For example, radian is the unit for an angle. But it is dimensionless because it is defined to be the ratio of two lengths.,
a dimensionless quantity will always be independent of the base units — meter, second, kilograms, kelvin, candela, moles, ampere.
Other examples:
1. Mass fraction
2.Mole fraction
both have unit (kg/kg)
Answer:
A quantity that has dimensions must have units. Yes a quantity have units but still be dimensionless for example,unit of angle is radian ,but it is a dimensionless quantity. A dimensionless quantity may have unit. ... A unitless quantity never has a non-zero dimension.
I hope it's helpful!
Describe how different energy stores are changed by the boiler.
[3 marks]
Answer:
Energy can remain in the same store for millions of years or sometimes just for a fraction of a second. There are energy transfers going on all the time - whenever a system changes there is a change in the way some or all of the energy is stored.
Transferring energy
In each of these examples, energy is transferred by one of the following four types of energy transfer:
mechanical work - a force moving an object through a distance
electrical work - charges moving due to a potential difference
heating - due to temperature difference caused electrically or by chemical reaction
radiation - energy tranferred as a wave, eg light and infrared - light radiation and infrared radiation are emitted from the sun
Doing 'work' is the scientific way of saying that energy has been transferred. For example, a grazing cow, a firing catapult and a boiling kettle are all doing 'work', as energy is being transferred.
Energy flow diagrams
Diagrams can be used to show how energy is transferred from one store to another. Two examples are the transfer diagram and the Sankey diagram.
Transfer diagrams
In transfer diagrams the boxes show the energy stores and the arrows show the energy transfers.
For example, a transfer diagram for a child at the top of a slide may be:
Energy transfer diagram of a child on a slide
Gravitational energy stored in the child at the top of the slide is transferred as mechanical work done to speed up and to do work against friction. The result of this is a shift of energy from gravitational potential energy to kinetic energy and internal energy (raising the temperature of the child and the slide).
Sankey diagrams
Sankey diagrams start off as one arrow that splits into two or more points. This shows how all of the energy in a system is transferred into different stores.
Sankey diagram of a child on a slide
Sankey diagrams are really useful when the amount of energy in each of the energy sources is known. The width of the arrow is drawn to scale to show the amount of energy.
Explanation:
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ℍ ꨄ︎
guys pls thi is my last pointa just answer this!!!!(WILL GIVE BRAINLY) A student takes apart a wooden box. What can they build with the materials from the box?
A) They cannot make anything with the materials.
B) They can make something new with the materials.
C) They can only make a wooden box from the materials.
Answer:
i guess u could pick "B" :)
Explanation:
IF you are in Space and push a bowling what happens to you and the bowling ball?
Answer:
The bowling ball did not change size or shape- the only thing that changed was the amount of gravity that pulls on it. But the mass of the bowling ball would never change. A bowling ball with a mass of 12 pounds on earth will have the mass of 12 pounds on the moon! Mass is the amount of atoms that a space fills.
Explanation:
I hope this helps! :D
I WILL GIVE BRAINLIST TO CORRECT ANSWERSSSS
Examine the symbols below:
Four schematics are shown. Each symbol shows a cell schematic with the plus and minus symbols. Symbol A has the pattern: long, short, long, and short lines. Symbol B has the pattern: long, short, long, short, long, and short lines. Symbol C has the pattern: long and short lines. Symbol D has the pattern: long, short, long, and short but rotated horizontally.
Which image represents a three-battery cell in a circuit? (2 points)
Group of answer choices
Symbol A
Symbol B
Symbol C
Symbol D
Answer:
The answer is SYMBOL B.
Explanation:
The correct schematic is the one that shows three groups of long and short lines. A schematic with one long and one short (one group) would be a one cell; a schematic with a long, a short, a long, a short (two group), would be a two cell; and a schematic with a long, a short, a long, a short, a long and a short (three group), would be a three cell- hence why the answer is symbol B.
Answer:
Symbol B
Explanation:
I took the test :)
In what way could a random mutation provide an organism with
an advantage?
Answer:
They are called beneficial mutations. They lead to new versions of proteins that help organisms adapt to changes in their environment. Beneficial mutations are essential for evolution to occur. They increase an organism's changes of surviving or reproducing, so they are likely to become more common over time.
Explanation:
What instrument is used to measure force?
1. Ruler
2. Balance
3. Spring scale
4. Barometer
Impulse equals?
A) momentum x velocity
B) momentum x time
C) mass x velocity
Answer:
B
Explanation:
The impulse experienced by an object is the force•time.
what are the different benefit of walking?
Answer:
U can walk to the bathroom
Explanation:
