Among the most important characteristics of fuels is their heating value.
oil and gas have relatively high heating values as compared to other locally available materials. they are also easy to burn as they are highly inflammable.
ignition takes less time due to this property.
Which is an advantage of using space observatories for space exploration?
It allows scientists to avoid the effects of light pollution.
Answer:
The advantage is to avoid the effects of light pollution.
Explanation:
There are several reasons why space observation is desirable in order to avoid problems that terrestrial observatories have. An example of this is that the space observatory does not suffer from the interference of city lights, avoiding light pollution. In addition, thermal turbulence (present in the atmosphere) also does not alter the telescope image. The terrestrial atmosphere, having a spherical shape, acts as a lens that distorts images (a fact known as optical aberration), so the resolution of terrestrial images has a significant reduction. The atmosphere of our planet also absorbs an important portion of the electromagnetic spectrum (infrared and ultraviolet rays, for example), so some observations are virtually impossible to make.
I'm hungry as hell right now. How much time does someone need to die from starving?
About 2 months depends on the person
PLEASE HELP ASAP!!
A ______ and a ______ are examples of inclined planes.
First options.
A. Lever.
B. Wedge.
Second options.
A. Pulley
B. Screw.
A. Wedge
and
B.Screw
A screw is like an inclined plane wrapped around a pole or rod.
and a wedge looks kind of looks like this / and is inclined.
Hope this helps!
Please mark me brainliest! Thanks!
You use a very sensitive instrument to measure the speed of sound in your front yard in December. You repeat the test in August when the temperature is 10°C (50°F) warmer. In August, the speed of sound will be:
A: slower
B: the same
C: faster
than in December.
The speed of sound varies depending on the medium through which the sound waves travel. In addition, it varies with changes in the temperature of the medium. This is because an increase in temperature means that the frequency of interactions between the particles that transport the vibration increases, hence this increase in activity increases the speed. That is why the speed of sound in a gas is not constant, but depends on the temperature.
So, if we want the speed of sound in a gas to increase, the temperature of that gas must increase, as well.
For example, the higher the air temperature, the greater the velocity of propagation. Experiments have shown that the speed of sound in air increases [tex]0.6m/s[/tex] for every [tex]1\°C[/tex] increase in temperature.
Therefore:
The speed of sound will be faster than in DecemberAnswer:
Faster
Explanation:
6.A train starts from rest and accelerates uniformly until it has traveled 5.6 km and acquired a velocity of 42m/s What is the approximate acceleration of the train during this time?
0.17 m/s2
0.20 m/s2
0.16 m/s2
0.14 m/s2
0.19 m/s2
0.16 m/s²
Explanation;From one of the equation of linear motion;
vf2 - vi2 = 2ax
Where;
vf = final speed after traveling a distance x at constant acceleration; vf = 42 m/s
vi = initial speed = 0 (starts from rest)
a = constant acceleration while traveling a distance x
x = distance traveled at constant acceleration; x = 5.6 km = 5600 m
Therefore;
a = vf2/(2x)
= 422/(2*5600) m/s²
= 0.1575 m/s²
≅ 0.16 m/s²
Answer:
O.16 m/s2
Explanation:
3. The direction of the centripetal force acting on a ball on a string being spun in a circle around a person is
A. outward-seeking.
B. parallel to the person.
C. perpendicular to the person.
D. center-seeking.
D. center seeking. Good Luck
Answer: The correct answer is "center-seeking".
Explanation:
Centripetal force is the force which is required to keep the body in the circular motion. The direction of the centripetal force is towards center of the circle.
The expression for the centripetal force is as follows;
[tex]F= \frac{mv^{2} }{r}[/tex]
Here, r is the radius, v is the velocity and m is the mass of the object.
Without this force, the body cannot move in the circular motion. Then, it follows the straight line motion.
The direction of the centripetal force acting on a ball on a string being spun in a circle around a person is center-seeking.
Therefore, the correct option is (D).
An alternating current in a wire has a voltage of 2,800 V. It needs to be reduced 70 V. The wire makes 120 turns in the primary coil of a step- down transformation. How many turns of wire need to be in the secondary coil?
To calculate the number of turns in the secondary coil, use the transformer equation. The number of turns in the secondary coil is found by multiplying the ratio of the secondary voltage to the primary voltage by the number of turns in the primary coil.
Explanation:To calculate the number of turns of wire needed in the secondary coil, we can use the transformer equation. The ratio of the secondary voltage to the primary voltage is equal to the ratio of the number of turns in the secondary coil to the number of turns in the primary coil. In this case, the primary voltage is 2,800 V and it needs to be reduced by 70 V. So, the secondary voltage is 2,800 V - 70 V = 2,730 V. The number of turns in the primary coil is 120. Using the transformer equation, we can find the number of turns in the secondary coil:
Number of turns in the secondary coil = (Secondary voltage / Primary voltage) * Number of turns in the primary coil
Number of turns in the secondary coil = (2,730 V / 2,800 V) * 120
Number of turns in the secondary coil = 117
Therefore, there should be 117 turns of wire in the secondary coil.
Learn more about Transformer equation here:https://brainly.com/question/28327649
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An atom with five protons six neutrons and five electrons has an atomic mass of
An atom with five protons six neutrons and five electrons has an atomic mass of.
The element is boron with a atomic mass of 10.811 u
HBr is added to water to form a solution. How does adding HBr to the water affect its PH level?
HBr has hydrogen ions (H+), not hydroxide ions (OH-).
Therefore, HBr is an acid, which decrease the pH level.
The answer is A.
the answer is D) your welcome :)))
To move a heavy couch across a carpeted floor what could be used to decrease the frictional force
Use a piece of cardboard
Put a lubricant between the surface of the object and the floor. use round objects, like pencils, to decrease the friction and push the refrigerator over the pencils
If temperature increases, what happens to pressure? Question 3 options: Pressure increases. Pressure decreases. Pressure stays the same.
Answer:
Pressure increases
Explanation:
Gay- Lussac's law gives the relationship between pressure and the temperature. There exists a direct relationship between temperature and pressure as per Gay- Lussac's law as :
At constant volume, [tex]pressure\propto temperature[/tex]
It is clear that pressure and temperature are directly proportional to each other. So, if temperature increases, pressure also increase. Hence, the correct option is (A) " Pressure increases ".
Answer: the pressure increases!
which of the following expressions is equivalent to the expression
[tex] \frac{ - 50}{8} [/tex]
a.
[tex] \frac{ - 50}{ - 8} [/tex]
b.
[tex] \frac{50}{ - 8} [/tex]
c.
Answer:
B. 50/-8
Explanation:
The expression -50/8 is equivalent to;
-50/8 = -6.25
The expression; 50/-8 is also equal to -6.25
Therefore;
The expression; -50/8 is equal to 50/-8
what is the simple average of these two velocities (0m/s, 0.4m/s)
The answer should be 0.2 :D
In which direction does a bag at rest move when a force of 20 newtons is applied from the right? A. in the direction of the applied force B. in the direction opposite of the direction of the applied force C. perpendicular to the direction of the applied force D. in a circular motion
The correct answer is A. In the direction of applied force. This is because acceleration occurs n the direction of applied force according to Newtons second law of motion which states that the acceleration of a body is directly proportional to the applied force and takes place in the direction of force.
Answer:
A. in the direction of the applied force
Explanation:
As per newton's first law of motion we know that object will not change in its state of motion till some external force is applied on it
So here we can say that when force is applied on an stationary object then the stationary object will move in the direction of applied force so change in the state of motion from rest state to moving state will occur and the direction of motion must be in applied force direction
So correct answer will be
A. in the direction of the applied force
What is the structure located inside the nucleus of a cell that contains an organism’s genetic code?
This belongs in the bio section but the structure are the chromosomes that contain the DNA strands themselves containing the genetic information of any living things
A cart with an initial velocity of 5.0 m/s to the right experiences a constant acceleration of 2.0 m/s2 to the right. What is the cart’s displacement during the first 6.0 s of this motion
Answer
66 m
Using the 2nd equation of linear motion, we can be able to solve the problem.
The equation states that;
S = ut + 1/2 at²
Where s ⇒ displacement,
u ⇒ initial velocity,
t ⇒ time and
a ⇒ is acceleration
∴ S = ut + 1/2 at²
= (5 × 6) + (1/2 × 2 × 6²)
= 30 + 36
= 66 m
The _____(height or width) of a sound wave determines its _____(loudness or pitch).
Sound waves are longitudinal mechanical waves, that is, they depend on a medium to propagate.
Among the characteristics of a sound wave, it is the amplitude, that is the degree of movement of the molecules of the medium in which the wave propagates.
Depending on how high this amplitude is, the sound will be louder.
Answer:
1. height
2. loudness
Consider the four spheres. As illustrated by the diagram, we would expect spheres A - C to be attracted to sphere D. Sphere D has the greatest gravitational force because as represented here, it
Has the most mass and density creating a gravitational field and pulling in the A and C with the lesser mass
Answer: the answer is A
Explanation:
Which statement best describes the superposition principle?
A.
If two in-phase waves arrive simultaneously at a point, their amplitudes add up.
B.
If two out-of-phase waves arrive simultaneously at a point, their amplitudes add up.
C.
If two in-phase waves arrive at a point one after another, their amplitudes add up.
D.
If two out-of-phase waves arrive at a point one after the other, their amplitudes adds up.
A. If two in-phase waves arrive simultaneously at a point, their amplitudes add up.
Explanation;According to the principle of superposition, when two waves of the same kind meet at a point in space, the resultant displacement at that point is the vector sum of the displacements that the two waves would separately produce at that point.Interference involves the superposing of two or more coherent waves to produce regions of maxima and minima in space, according to the principle of superposition. Interference may be constructive or destructive; Constructive interference occurs when two or more waves arrive at the screen in phase with each other, such that the amplitude of the resultant wave is the sum of the amplitude of the individual waves.Destructive interference occurs when two or more waves arrive out of phase with each other and resultant wave has minimum amplitude.Answer:
answer should be A.
Explanation:
a tool that uses lenses to focus light and
create useful images
the answer your looking for is Optical instrument.
-- microscope
-- eyeglasses
-- telescope (refracting type)
When two objects collide, what happens to the total momentum of the interacting forces? Explain why (use the vocabulary: momentum, potential energy and kinetic energy) How is mass related?
In a closed system, when two or more particles collide, the sum of momentum of two particles before and after collision will always be the same. In elastic collision, kinetic energy and momentum of a particle remains conserved. Whereas in inelastic collision, momentum remains same before and after collision but some of the particle's kinetic energy may be converted to other forms of energy.
A moving particle or object may possess kinetic energy and it depends mainly on its motion and mass. The kinetic energy is converted into potential energy and converted back to kinetic energy during collision of small particles.
You take a conductive wire and make loops in it, you create a _________.
A.) CIrcuit Breaker
B.) Rheostat
C.) Solenoid
D.) Fuse
When you take a long piece of wire, form it into a coil of several loops, and run a current through it, you get a magnetic field that runs straight along the axis of the coil.
This arrangement of a conductor and the current through it is called a "solenoid". (C)
A solenoid is a form of coil that produces a magnetic field when the electric current is passed through it. A solenoid is created when a conductive wire is used to make a loop.
what is a solenoid?A coil of wire that carries an electric current is a solenoid. A solenoid is an electromagnet formed by a helical coil of wire. Which generates a magnetic field when an electric current is passed through the coil .
What is a conductive wire?In material or wire conductance is dependent on the number of mobile electrons present in the material or wire.
A conductive wire is a type of wire which has a sufficient amount of mobile electrons which are useful for producing conductance in the material.
examplessilver, copper, iron, etc.
To learn more about the solenoid refer to the link ;
brainly.com/question/16015159
If temp. gets cold resistance in thermostat increases so voltage across it increases AND LED lights brighter. I understand everything except that for LED. It emits light when current passes through it, but if resistance increases how can current increase???
Normally, when something gets colder, its electrical resistance gets smaller. This is true of component-A in the drawing ... a simple resistor.
The component labeled 'B' has a strange and unusual symbol, and it's not a simple resistor. It's a "thermistor". The word "thermal" always has something to do with heat, and "thermistor" comes from "thermal resistor. These things can be manufactured either way ... using different materials, a thermistor can be manufactured so that its resistance goes UP, or goes DOWN, or doesn'tchange when it gets colder. I'm pretty sure that's what's going on here.
When this circuit gets colder, resistance-A gets smaller, but resistance-B either gets bigger OR doesn't change. Either way, the voltage across B increases. Since the LED is connected directly across B, the current through it depends on that voltage, so the LED gets more current, and becomes brighter, when A and B both get colder.
This circuit could actually be a very useful device. If you took out the LED and put a voltmeter in its place, then the reading on the voltmeter would tell you the temperature of wherever you put the two components A and B.
Mass is a measure of the amount of matter in a substance. Weight, on the other hand, is a form of gravitational attraction, which is dependent upon mass and distance. Which of the following actions will cause the gravitational attraction between the Earth and an object to increase?
A.
increasing the mass of the object
B.
decreasing the mass of the Earth
C.
increasing the distance between the Earth and the object
D.
decreasing the distance between the object and the Sun
From this particular list of choices, only A. increasing the mass of the object can increase the gravitational attraction between the object and the Earth.
Choices B and C have exactly the opposite effect, and choice-D has no effect at all.
This is all just a complicated, technical way of saying that if you eat a big steak plus a few shakes, your mass increases, and you WILL gain weight.
Answer:
A
Explanation:
got it right on study island
A ball is thrown straight up into the air with a speed of 10 m/s . If the ball has a mass of 0.3 kg how high does the ball go ?
= 5.102 m
Explanation;The total energy, i.e. sum of kinetic and potential energy, is constant.
That is; E = KE + PE
Initially, PE = 0 and KE = 1/2 mv^2
At maximum height, velocity=0, thus, KE = 0 and PE = mgh
Since, total energy is constant (KE converts to PE when the ball is rising).
Therefore, KE = PE
or, 1/2 mv^2 = mgh
or, h = v^2 /2g
= 10^2 / (2x9.8)
= 5.102 m
Answer:
5.1
Explanation:
apex
Which is the goal of technology
TO bring joy and ease
It is the use of a (usually) mechanical means to create something physical that uses some scientific principle that will be used in war or for the betterment of man or both.
It is a machine that creates destruction or good or both that uses some sort of scientific basis of which it is an application.
most earthquakes happen:
Final answer:
Most earthquakes occur along plate boundaries where stress is released through sudden slippages. The longer the interval between earthquakes, the greater the stress and energy released when the surface finally moves.
Explanation:
Most earthquakes occur along plate boundaries where tectonic plates interact. The motion of these plates builds up stress in the crust, which is released in sudden and violent slippages that generate earthquakes. The longer the interval between earthquakes, the greater the stress and the more energy released when the surface finally moves. For example, in California, the San Andreas Fault slips every 25 years or so, while the average interval between major earthquakes in the Los Angeles region is about 150 years.
definition of liquid
a substance that is not solid
plz give me a brainliesttttt
According to the dictionary, the definition of liquid is, "a substance that flows freely but is of constant volume, having a consistency like that of water or oil."
Choose all the answers that apply. The sun: -is the largest star in our solar system -is the largest star in our galaxy
- is made mostly of hydrogen and helium
-will eventually run out of fuel and die
-creates energy through nuclear reactions
-is made mostly of hydrogen and helium.
-will eventually run out of fuel and die.
-creates energy through nuclear reactions
Answer:
The sun:
-is the largest star in our solar system
- is made mostly of hydrogen and helium
-will eventually run out of fuel and die
-creates energy through nuclear reactions
Explanation:
The sun an average mass and sized star composed of hydrogen and helium gas. It generates energy in its core by nuclear fusion reaction. It is the only star in the solar system. Once all the fuel is run out, the nuclear fusion reaction would stop and the sun would die. There are billions of stars in our milky way galaxy and sun is not the largest of them.
Which of the is a trait in humans that is determined by multiple alleles
The best characterized example of multiple alleles in humans is the ABO blood groups, discussed in the Non-Mendelian Inheritance concept. Other human traits determined by multiple alleles would be hair color, hair texture, eye color, built, physical structures, etc.