Answer:
summary
Conduction is heat transfer through stationary matter by physical contact. ...
Convection is the heat transfer by the macroscopic movement of a fluid. ...
Heat transfer by radiation occurs when microwaves, infrared radiation, visible light, or another form of electromagnetic radiation is emitted or absorbed
Explanation:
2. The electrostatic force of attraction between two small spheres that are 1.0 m apart is F. If the distance between the spheres is decreased to 0.5 m, the electrostatic force will then be
The electrostatic force between the two spheres when their distance is decrease to 0.5 m will be 4F
Data obtained from the question Initial distance apart (r₁) = 1 mInitial force (F₁) = FFinal distance apart (r₂) = 0.5 mFinal force (F₂) =? How to determine the final forceFrom Coulomb's law,
F = Kq₁q₂ / r²
Cross multiply
Fr² = Kq₁q₂
Kq₁q₂ = constant
F₁r₁² = F₂r₂²
With the above formula, we can obtain the final force as follow:
F₁r₁² = F₂r₂²
F × 1² = F₂ × 0.5²
F = F₂ × 0.25
Divide both side by 0.25
F₂ = F / 0.25
F₂ = 4F
Thus, we can conclude that the final force will increase by a factor of 4
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If a car is moving +14m/s is to stop within 2 seconds, what must the car's acceleration be?
Acceleration is -7 m/s²
Explanation:
initial velocity (u) = 14 m/s
since it's gonna stop,
final velocity (v) = 0m/s
time taken(t) = 2 seconds
now,
a = (v-u)/t
or, a = (0-14)/2
or, a = -14/2
a = -7m/s²
A 45 kg object has a momentum of 225 kg-m/s northward. What is the object's velocity?
Answer: 5 m/s North
Explanation:
Velocity = Momentum/Mass
Velocity = 225 kg*m/s/45kg
Velocity = 5 m/s North
please help A 10 kg box initially at rest is pulled with a 50 N horizontal force for 4 m across a level surface. The force of friction acting on the box is a constant 20 N. How much work is done by the gravitational force?
A. 100 J
B. 0 J
C. 10 J
D. 50 J
The box is being pulled horizontally, so any work done on the box must be done by forces that are parallel to the ground. But gravity always points downward, which is perpendicular to the surface in this case, so the gravitational force performs B. 0 J of work.
A cylindrical tank with radius 5 m is being filled with water at a rate of 2 m3/min. How fast is the height of the water increasing?.
V(volume of cylinder) = A.h = πr².h
V = 25π.h m³
rate (Q) = V : t
[tex]\tt t=\dfrac{V}{Q}=\dfrac{25\pi h~m^3}{2~m^3/min}=12.5\pi h~min[/tex]
We all play on the roller coaster in playgrounds, but Ahmad suggested playing this game alone. Take point B as a reference level. Suppose Ahmad starts from rest at point A and moves downward towards point B. What happens to his gravitational potential energy as he moves downward?
Answer:
b
Explanation:
calculate the deceleration of the car
Answer:
C
Explanation:
Answer:
i think the answer is a because of division
Explanation:
A crate of mass 50kg is pushed along a floor with a force of 20N for a distance of
5m. Calculate the work done.
Answer:
F=50kg
D=5m
W=FD
therefore work done is 250Nm
The work done will be 100 J. It is obtained as the product of the force and displacement.
What is work done?Work done is defined as the product of applied force and the distance through which the body is displaced on which the force is applied.
Work may be zero, positive and negative.it depends on the direction of the body displaced. if the body is displaced in the same direction of the force it will be positive.
The given data in the problem is;
m is the mass of the crate = 50 kg
F is the force of 20 N
d is the distance = 5 m
W is the work done.
[tex]\rm W =F \times d \\\\ \rm W =20 \times 5 \\\\ W= 100 \ J[/tex]
Hence the work done will be 100 J.
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The image when obtained from a concave lens of focal length f is magnified up to n times the size of the object. What is the distance of object from the lens?
[tex] \frac{1}{v} - \frac{1}{u} = \frac{1}{f} [/tex]
[tex] \implies \: \frac{u}{v} - 1 = \frac{u}{f} \: \: \: ......(i)[/tex]
[tex] \text{As} \: m = \frac{v}{u} = n \: \: \: \: \: \: \text{(given)}[/tex]
[tex] \implies \frac{u}{v} = \frac{1}{n} [/tex]
[tex] \text{Substituting the above values in Eq. (i), we get}[/tex]
[tex] \implies [\frac{1}{n} - 1 ] = \frac{u}{f} [/tex]
[tex] \implies \: u = [ \frac{1 - n}{n} ]f[/tex]
Hope This Helps :)!!!Please define parameters
Answer:
a numerical or other measurable factor forming one of a set that defines a system or sets the conditions of its operation.
Answer: A variable for which the range of possible values identifies a collection of distinct cases in a problem.
Explanation: A numerical or other measurable factor forming one of a set that defines a system or sets the conditions of its operation.
For example: "the transmission will not let you downshift unless your speed is within the lower gear's parameters".
When a gas is transferred from one container into another container, which of the following does not occur? a. The gas flows into the new container. b. The gas changes shape to fit the new container. c. The gas spreads out to fill the new container. d. The gas keeps its original volume. Please select the best answer from the choices provided A B C D
Answer:
B.
Explanation:
Gases flow and spread easily in all directions until they reach the walls of the container. It can have a definite volume, but no definite shape.
f the crate starts from rest 8.95 mm up along the plane from its base, what will be the crate's speed when it reaches the bottom of the incline
Answer:
Its speed would be increasing.
Explanation:
21. The number of significant figures in 7316000 are 1 (a)7 (b) 6 (d) 4 (c)5
Answer:
no.7 is answer
Explanation:
because you understand by your self ok
What do scientists use to study the patterns and impacts of climate change over time?
A. all of the above
B. tree rings and ice formed thousands of years ago
C. fossilized pollen and tree rings
D. chemical isotopes in foraminifera shells and fossilized pollen
Scientists use the following to study the patterns and impacts of climate change over time :
Tree rings and ice formed thousands of years agoFossilized pollen and tree ringsChemical isotopes in foraminifera shells and fossilized pollenWhat is Climate?
This is defined as the atmospheric condition of a place over a long period of time.
Scientists use physical, chemical and biological methods to study impacts of climate change which makes option A the most appropriate.
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Please help me with this question
Answer:
5m
Explanation:
the amplitude of a wave is basically if you cut the wave in half horizontally and went from the half point to either the lowest or highest point of the wave. and the midpoint of wave A is 0 and u can either go up 5 to get to the highest point, or down 5 to get to the lowest point (;
the first periodic table of elements mandeleev created contained only 45 elements. true or false
Answer:
false
Explanation:
calculate the speed above.
what type of motion is describe on this graph?
graph the paper vs. time.
does your graph for speed vs time match your distance vs time graph how do you know?
please answer correctly and ill give branliest
5) Spinning blades may injure or kill aquatic species.
6) During high tide, the ocean's waters creep up the shore, deepening the water. This happens as a body of water gets closer to one of the two bulges created by the moon's gravitational force
Choose the word to fill in the blank, which best completes the sentence. Light entering a clear glass prism. A rainbow exits the prism on the opposite side. Prisms made of glass will ________ light and create colored rainbows on a wall, as is shown in the image above. A. Transmit c. Refract b. Transfer d. Absorb Please select the best answer from the choices provided A B C D.
Answer:c. Refract
When light splits into multiple colours by a prism, it is called refraction.
Answer:ccccccccccccc or refract
Explanation:truuust lol
D Calculate the
average speed of a
car that travels 70 km
in 1.5 hours
Answer:
s = 46.67 km/h
Explanation:
s = d/t
s = 70/1.5
how is it possible to have a small power output when moving a large load a long distance
Answer:
is to increase efficiency
Explanation:
is to increase efficiency
Thermal energy can be converted into motion by which of the following devices?
A.Microwave oven
B.Solar panel
C.Steam engine
D.Electric toaster
A few alpha particles bounce off a thin sheet of gold foil. What did scientists
inter about atoms from this experimental result?
O A Atoms are made up of smaller particles.
2. Atoms of different elements are composed differently.
O C. Atoms have a dense, positively charged center
D. Electrons have more energy the farther they are from the nucleus.
Answer:
I world say A is the answer 80% sure
Milan is measuring the density of ethanol. He weighs a bottle three times:
first, empty; then filled with water; then filled with ethanol. Here are his
results:
mass of empty bottle = 30.0g
mass of bottle filled with water = 90.0g
mass of bottle filled with ethanol = = 78.0g
i Calculate the volume of the bottle.
[tex]\\ \tt\hookrightarrow Density=\dfrac{Mass}{Volume}[/tex]
[tex]\\ \tt\hookrightarrow Volume=\dfrac{Mass}{Density}[/tex]
[tex]\\ \tt\hookrightarrow volume=\dfrac{48}{0.789}[/tex]
[tex]\\ \tt\hookrightarrow Volume=68.83cm^3[/tex]
Density of ethanol[tex]=0.789g/cm^3[/tex]
Mass of ethanol[tex]=78-30=48g[/tex]
[tex]Density = \frac{Mass}{Volume} [/tex]
[tex]Volume = \frac{Mass}{Density}[/tex]
[tex]Volume = \frac{48}{0.789}[/tex]
[tex]Volume = 68.83cm³[/tex]
What does red shift tell about the movement of a galaxy?
Thermodynamics
Heat engines were first envisioned and built during the Industrial Revolution. Explain the thermodynamics of a heat engine, commenting on its efficiency.
Answer:
A heat engine is a device that converts internal energy into work. Internal energy is increased by the addition of heat. The efficiency of a heat engine is a measurement of how efficiently it works. Efficiency compares the amount of useful energy extracted from a process to the total energy input. The heat engine will be more efficient if the percentage is higher.
Explanation:
A polymerization process is used to create a synthetic rubber material known as styrene butadiene copolymer. Explain the difference between a chemical formula and a chemical equation, using this copolymer as an example.
Answer:
the picture is so blured can you type it in comment i will wait:(
A person feels hungry even though he does not do any work
Answer:
yes because you need energy even for eye blinking
When are hypotheses supported in science? (Site 1).
A hypothesis is said to be a scientific hypothesis. It should be supported by the majority or done through a careful experimentation process. A scientific hypothesis is the main element in the scientific method and experiment.
What is a hypothesis?
The hypothesis is a proposed explanation of the research or a test that has to do in the future.
It is an assumption made before an experiment to get the road map of the research as well as to prove it right through testing and research activities.
It is said to be the theoretical way of a practical solution. A hypothesis is must form before research. It is making for the objective of being tested.
Therefore hypothesis is supported when it is carried out by proper experiment and testing.
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The attractive force between two objects that
depends on their masses and the distance
between them is called
Answer:
The answer is gravity
Explanation: Hope this helps:)