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What are potential sources of error in Marta's
experiment?
Answer:
She only looked at the results for lunch and no other meals. She did not define what “healthy” means. She tested a different number of girls and boys and did not factor that into her results. Her study is biased.
Explanation:
Answer:
She only looked at the results for lunch and no other meals. She did not define what “healthy” means. She tested a different number of girls and boys and did not factor that into her results. Her study is biased.
Explanation:
Explanation:
Write any 4 equations base on velocity and acceleration.
PLEASE HELP ASAP !! I WILL MARK YOU BRAINLIEST!!
Answer:
A -- Correct (what you have on the paper)
B -- (Sphere A - negative 6 ) (Sphere B - negative 6) (Sphere C - positive 9)
(Total - negative 3)
Explanation:
Hope this helps! Please let me know if you need more help, or if you think my answer is incorrect. Brainliest would be MUCH appreciated. Have a wonderful day!
Answer:
Explanation:
a. Total charge = sum of charges of A, B and C
= -4 + -8 + 9
= -3.0C
b. After touching each other, the charges on A and B will equalized. When separated, they have the same charge = (-4 + -8) / 2 = -6.
Charge on C and the total charge will not change.
A : -6.0C
B : -6.0C
C : +9.0C
Total : -3.0C
A truck is pulling a trailer down a highway. The total mass of the trailer is 360kg and the
force at which the truck is pulling is 7.200N, What is the acceleration of the truck?
Question :-
A Truck is Pulling a Trailer down a Highway . The Total Mass of the Trailer is 360kg and the Force at which the Truck is pulling is 7200 Newton . What is the Acceleration of the Truck ?Answer :-
Acceleration of the Truck is 20 m/s² .Explanation :-
As per the provided information in the given question, we have been given that the Mass of the trailer is 360 kg . Force is given as 7200 Newton . And, we have beena asked to calculate the Acceleration of the Truck .
For calculating the Acceleration , we will use the Formula :-
[tex] \bigstar \: \: \: \boxed {\sf{ \: Acceleration \: = \: \dfrac {Force}{Mass} \: }} [/tex]
Therefore , by Substituting the given values in the above Formula :-
[tex] \dag \: \: \: \sf {Acceleration \: = \: \dfrac {Force}{Mass}} [/tex]
[tex] \longmapsto \: \: \: \sf {Acceleration \: = \: \dfrac {7200}{360}} [/tex]
[tex] \longmapsto \: \: \: \textbf {\textsf {Acceleration \: = \: 20 }} [/tex]
Hence :-
Acceleration = 20 m/s² .[tex] \underline {\rule {180pt} {4pt} } [/tex]
Answer:
A Truck is Pulling a Trailer down a Highway . The Total Mass of the Trailer is 360kg and the Force at which the Truck is pulling is 7200 Newton . What is the Acceleration of the Truck ?
Answer :-
Acceleration of the Truck is 20 m/s² .
Explanation :-
As per the provided information in the given question, we have been given that the Mass of the trailer is 360 kg . Force is given as 7200 Newton . And, we have beena asked to calculate the Acceleration of the Truck .
For calculating the Acceleration , we will use the Formula :-
\bigstar \: \: \: \boxed {\sf{ \: Acceleration \: = \: \dfrac {Force}{Mass} \: }}★
Acceleration=
Mass
Force
Therefore , by Substituting the given values in the above Formula :-
\dag \: \: \: \sf {Acceleration \: = \: \dfrac {Force}{Mass}}†Acceleration=
Mass
Force
\longmapsto \: \: \: \sf {Acceleration \: = \: \dfrac {7200}{360}}⟼Acceleration=
360
7200
\longmapsto \: \: \: \textbf {\textsf {Acceleration \: = \: 20 }}⟼Acceleration = 20
Hence :-
Acceleration = 20 m/s² .
Does the surface area of the salute, the temperature
of the savent, and the amount or agitation that
loccurs when the solute and the savent are mixed
affect the rate or dissolution, how?
Answer:
if I understand ur question, you mean does the surface area of solute, temperature of solvent and the amount of particles affect the rate of dissolution?
YES
How? The surface area of the solute is the part that is in contact with the solvent. For this reason granules or powdery substance dissolves better than it lumps.
The temperature of solvent also affects dissolution. For solid solutes, increase in temperature causes solute to disslove better but for gases increase in temperature reduces their solubility
Amount of particles also affect dissolution. A quantity of solvent has limited number of particles it can dissolve. If the particles are more than the solvent can dissolve,the excess particles will precipitate out
What is 1,000 kilograms in Newtons?
Answer:
9800 N
Explanation:
F = mg
I am assuming the question is what is the weight of a 1000kg on earth
Which car part tells the velocity of a car at a given time?
A. Odometer
C. Accelerator
B. Speedometer
D. Fuel gauge
Answer:
Speedometer. It's in the name.
Describe the 4 steps taken to separate a solid mixture of iron fillings, chalk powde
and table salt based on their properties given below.
[3]
The first step has been done for you.
Soluble in water?
Magnetic?
Decompose upon
heating?
No
Yes
No
Iron
Fillings
Chalk
powder
able salt
No
No
Yes
Yes
No
No
Answer:
no yes
Explanation:
explain how william gilbert used the scientific method to disprove ptolemy's belief that garlic affected lodestone
Answer:
While maintaining a successful medical practice, Gilbert carried out extensive research into electricity and magnetism. Very little about these phenomena was understood when he began his experiments. The basic magnetic properties of lodestone (magnetic iron ore) were familiar, the magnetic compass had been in use for some time by navigators, and the amber effect (now called the triboelectric effect), by which amber and certain other materials acquire a static charge via friction, was generally known. But no one could adequately explain how or why such things worked. Gilbert’s investigations led him to develop a number of his own theories.
Explanation:
If you rub an air-filled balloon on your hair, you can make it stick to a wall. when the balloon and your hair are rubbed together, electrons are transferred from your hair to the balloon.
a. what is the net charge on the balloon after it is rubbed on your hair? is it positive, negative, or zero?
b. what do you think happens to the atoms near the wall's surface when the balloon is brought near the wall? (hint: the balloon will stick to the wall.) halloon to a metal
Atoms will be negatively charged whenever they gain electrons. Attraction of atoms is due to opposite charges of the atoms.
a. Negative
b. Atoms near the wall are positively charged.
Static ElectricityThis is the phenomenon whereby the carrier of electric charges are not in motion.
The fundamental law of electrostatic state that like charges repel while like charges attract each others.
If you rub an air-filled balloon on your hair, you can make it stick to a wall. when the balloon and your hair are rubbed together, electrons are transferred from your hair to the balloon.
a. The net charge on the balloon after it is rubbed on your hair will therefore be negative because it has gained electron
b. The atoms near the wall's surface are positively charged. When the balloon is brought near the wall, unlike charges will surely attract each other.
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I need help with this will give brainly.
Remote-controlled planes may take over most hurricane-hunting missions
A. Vivid Language
B. Objective Language
Answer:
gogo
Explanation:
A circus truck full of monkeys has a mass of 3175 kg. The kinetic energy of the circus truck is 128,587.5 J. Calculate the speed of the truck.
Explanation:
please mark me as brainlest
A circus truck full of monkeys has a mass of 3175 kg. The kinetic energy of the circus truck is 128,587.5 J. The speed of the truck is 9 m/sec
What is speed?The speed of an object is the magnitude of the change of its position over time or the magnitude of the change of its position per unit of time; it is thus a scalar quantity.
Kinetic Energy =(.5) Mass. (Velocity)²
K.E = 0.5 m.v²
81 = v²
v = 9 m/sec
A circus truck full of monkeys has a mass of 3175 kg. The kinetic energy of the circus truck is 128,587.5 J. The speed of the truck is 9 m/sec
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2- Two materials, A and B, are used to make cables of
identical cross section and length, to lift identical loads.
If A has a greater Young's Modulus than B, which cable
will stretch the most when loaded? Explain why.
Answer:
Cable B will more stretch the most.
Explanation:
Given that,
Length of material A =[tex]l_{A}[/tex]
Length of material B =[tex]l_{B}[/tex]
If A has a greater Young's Modulus than B.
We know that,
The deflection is defined as,
[tex]\delta=\dfrac{Wl}{AE}[/tex]
For material A,
[tex]\delta_{A}=\dfrac{W_{A}l_{A}}{A_{A}E_{A}}[/tex]
[tex]\delta_{A}\propto\dfrac{1}{E_{A}}[/tex]
For material B,
[tex]\delta_{B}=\dfrac{W_{B}l_{B}}{A_{B}E_{B}}[/tex]
[tex]\delta_{B}\propto\dfrac{1}{E_{B}}[/tex]
The deflection is inversely proportional to the young's modulus.
We need to find which cable will stretch the most when loaded
Using formula of deflection
[tex]\dfrac{\delta_{A}}{\delta_{B}}=\dfrac{\dfrac{W_{A}l_{A}}{A_{A}E_{A}}}{\dfrac{W_{B}l_{B}}{A_{B}E_{B}}}[/tex]
Put the value into the formula
[tex]\dfrac{\delta_{A}}{\delta_{B}}=\dfrac{\dfrac{Wl}{AE_{A}}}{\dfrac{Wl}{AE_{B}}}[/tex]
[tex]\dfrac{\delta_{A}}{\delta_{B}}=\dfrac{E_{B}}{E_{A}}[/tex]
So, [tex]\delta_{B}>\delta_{A}[/tex]
Hence, Cable B will more stretch the most.
how is the rotation of the sun, different from the rotation of the earth
Answer:
The Sun has a north and south pole, just as the Earth does, and rotates on its axis. However, unlike Earth which rotates at all latitudes every 24 hours, the Sun rotates every 25 days at the equator and takes progressively longer to rotate at higher latitudes, up to 35 days at the poles. This is known as differential rotation.
Explanation:
What are some common positive and negative attitudes toward physical activities? What
is your personal attitude toward exercise and physical activity? What three emotions do
you immediately feel when you think about your health and fitness? What is the
relationship between physical fitness and health? How does physical fitness affect your
personal health?
A hot air balloon hovers at 92.4 m above the ground. The pilot drops a box over the edge of the basket. How fast does the person standing 10 m away, have to go to catch the box, before it hits the ground?
Answer:
The person has to move at the speed of 2.30 m/s towards the dropping point to catch the box.
Explanation:
Let t be the time taken by the box to reach the ground and v be the speed of the person on the ground standing 10 m away from the dropping
point.
As distance=(speed) x (time), so
[tex]10=vt\cdots(i)[/tex]
Initially, the height of the box from the ground is 92.4 m.
So, the displacement, s, covered by the box when it reached the ground,
[tex]s=92.4[/tex] m in the downward direction.
The gravitational force action of the box is also in the downward direction.
The initial velocity of the balloon, u=0.
According to the equation of motion,
[tex]s=ut+\frac1 2 at^2[/tex]
where a is the acceleration, u is initial velocity and.
Here, [tex]a=g=9.81 m/s^2[/tex] (acceleration due to gravity) and s and a are having the same direction.
So, on putting the values in the equation, we have
[tex]92.4=0\timest+ \frac 1 2 (9.81)t^2[/tex]
[tex]\Rightarrow t^2=\frac{92.4\times 2}{9.81}[/tex]
[tex]\Rightarrow t=\sqrt{\frac{92.4\times 2}{9.81}}[/tex]
[tex]\Rightarrow t=4.34[/tex] seconds.
So, the time available for the man on the ground to catch the bot is 4.34 seconds.
Now, from equation (i),
[tex]10=v\times 4.34[/tex]
[tex]\Rightarrow v = 10/4.34[/tex]
[tex]\Rightarrow v = 2.30[/tex] m/s.
Hence, the person has to move at the speed of 2.30 m/s towards the dropping point to catch the box.
How are distance and elapsed time different?
Answer:
hope it helps...
Explanation:
The length an object moves through its motion is called the distance. ... The motion of an object takes time to occur. That is, moving from one place to another happens in the course of time. Such a time interval is called the elapsed time.
PLEASE THANK MY ANSWER..
Distance is a numerical representation of the distance between two objects or locations. The elapsed time is the name given to such a period of time.
What is the distance?Distance is a numerical representation of the distance between two objects or locations.
The distance can refer to a physical length or an estimate based on other factors in physics or common use. |AB| is a symbol for the distance between two points A and B.
The relation between the distance and the time is found as;
distance = speed × time
[tex]\rm d = v \times t[/tex]
The distance is the length of time an item moves during its motion. An object's motion needs time to occur. That is, traveling from one location to another occurs across time.
The elapsed time is the name given to such a period of time. It is denoted by t.
Hence the denotation and the defination of both physical quantity is different.
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You do 25 J of work while using a hammer. The hammer does 18 J of work on the nail. What is the efficiency of the hammer?
physical science
help please
Answer:
The efficiency of the hammer is 72%.
Explanation:
output work/input work x 100%
18J/25J x 100%
0.72 x 100%
72%
Good evening! Can someone please answer this, ill give you brainliest and your earning 50 points. Would be very appreciated.
Explanation:
Broderline Green house gases are Carbon dioxide, sulphur dioxide etc.These gases absorb long wave photons of infrared light .It simply increases the temperature of our atmosphere .It becomes a reason behind increase in sea levelOption B is correct
A 12. 0 V battery delivers a 1. 20 A current to an electric motor that is
connected across terminals. What power is consumed by the motor?
O 14. 4 w
O 14. 4J
O 10. 0 J
O 10. 0 W
A ball is gently dropped from a height of 30m. If its velocity increase uniform at the rate of 10m/s with what veloscity will it stricks the ground ? After what time will it stricke the ground?
Answer:
∆y=30m
Vi=10m/s
a=9.8
Vf=?
(1)Vf²=Vi²+2a∆y
Vf²=(10)²+2(9.8)(30)
Vf²=100+588
Vf²=688
√Vf²=√688
Vf= 26,23
(2) Vf=Vi+a∆t
26,23=10+9,8∆t
16,23=9,8∆t
∆t=1,66 sec
Which property describes the temperature at which a liquid changes to a gas?
Group of answer choices
freezing point
boiling point
melting point
condensation point
Answer:
Boiling Point
Explanation:
When a liquid changes to a gas is called the boiling point.
Differentiate between concave and convex lens. Write your own answer
Answer:
A concave lens is thinner at the center and thicker at the edges while a convex lens is thicker at the centre and thinner at the edges.
Answer:
Read below.
Explanation:
Convex lenses: have a thicker centre than their edges. Converges light rays to a point.
Concave lenses: have thicker edges than their centre. Diverges the light rays passing through it.
20 POINTS!!
This box of macaroni is used in both parts of this question.
Find the volume of this box of macaroni. Be sure to show your work and label all units.
Answer:
348
Explanation:
because maths ;)
The box of macaroni are in the shape of a cuboid, and the volume of the cuboid in the same unit will be 348 cm.
What is Volume?A three-dimensional space's volume can be calculated. It is frequently expressed in numerical form using SI-derived units or by different imperial units (such as the gallon, quart, and cubic inch). Volume and length are related by the definition of length (cubed). In contrast to how much space the container occupies, the volume of a container is typically thought of as its carrying capacity or the amount of fluid (liquid or gas) that it could hold.
According to the question, the given values are :
Length, l = 16 cm
Width, b = 7.5 cm
Height, h = 2.9 cm
So, the volume of the Cuboid will be, V : l × b × h
V = 16 × 7.5 × 2.9
V = 348 cm³.
Hence, the volume of macaroni box will be 348 cm³.
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If the Voltage is increased Current decrease what happens to the resistance
An object is in simple harmonic motion. of the following quantities related to the object, which set of three can have maximum magnitudes at the same instant of time?.
The amplitude, restoring force and speed of an object undergoing simple harmonic motion may have maximum magnitudes at the same instant of time.
What is simple harmonic motion?Simple harmonic motion is a regular repeating motion. The acceleration of a simple harmonic motion is always directed towards the center of the motion.
There are three quantities related to the object that can have maximum values at the same time and these are;
AmplitudeRestoring forceSpeedLearn more about simple harmonic motion:https://brainly.com/question/17315536
A car has a mass of 1.50 x 10^3kg. If the force acting on the car is
6.75 X 10^3 N to the east, what is the car's acceleration?
Nima explains that visible light occupies the range of the electromagnetic spectrum that humans can see. What other characteristics of visible light can Nima share with her students
Other characteristics that Nima can share with her students are as follows:
Visible light ranges in wavelength of 400 - 700nmVisible light is between the ultraviolet and infrared rays of the EM spectrum. What is visible light?Visible light is one of the components of the electromagnetic spectrum (EM). It is the only part of the EM spectrum that is visible to human eyes.
According to this question, Nima has already shared this characteristics of visible light with her student.
Other characteristics that Nima can share with her students are as follows:
Visible light ranges in wavelength of 400 - 700nmVisible light is between the ultraviolet and infrared rays of the EM spectrum.Learn more about visible light at: https://brainly.com/question/7071188
HELP, 15 POINTS!
How does uniform motion relate to velocity and acceleration?
For an object to move in a uniform motion it has to have either a constant velocity or a constant acceleration. If the object has a constant velocity then it is moving at zero acceleration and this means moving with out slowing down or speeding up.
Two ways to report the amount of elements is to give the percentage by number and percentage by mass. When reporting the composition of the sun by mass percentage, the amount of hydrogen drops, but the amount of helium grows. Why?
The composition of the sun by mass of hydrogen drops, but the amount of helium grows because helium is heavier than hydrogen.
What is the percentage by mass of an element in a substance?The percentage by mass of an element in a compound is the percentage the mass of that element contributes to the total mass of the substance.
The percentage by mass of an element depends on the mass of the element.
Heavier elements in equal amounts with less dense elements have a greater percentage mass.
Since the mass of the helium atom is greater than the mass of the hydrogen atom, the Sun's composition by mass of hydrogen drops while that of helium increases.
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