The heat equation is Q = mcT
Q is the total amount of heat transferred to or from something.
What type of monomers make up liquids
Answer:
Carbohydrates - monosaccharides.
Lipids - glycerol and fatty acids.
Nucleic acids - nucleotides.
Proteins - amino acids.
Explanation:
Describe the electric and magnetic fields of an electromagnetic wave.
List four conditions that may result in the emission of electrons from a conductor.
Answer:
1 Conditions that result in the emission of electrons from a conductor:
Heating the conductor to a suitable temperature
Exposing the conductor to a strong light
Subjecting the conductor to a very high applied voltage
Subjecting the conductor to high-speed electrons from another source
2 Both diodes and triodes influence current flow and contain electrodes. Diodes involve only two active pieces; triodes contain three electrodes within a tube. Current can flow through a diode in only one direction. Diodes tend to act as rectifiers. In a triode, the third electrode is a grid located between the cathode and the anode. A small difference of potential between the grid and the cathode controls the number of electrons that reach the anode. Adjusting the charge on the grid affects the number of electrons that can reach the anode. Triodes tend to act as amplifiers.
3 a Transmitting antenna
b Modulator
c Oscillator
d Microphone
4 a RF amplifier
b Receiving antenna
c Loudspeaker
d Demodulator
e Tuner
5 hue, saturation, intensity/brightness
6 red, blue, green
Explanation
PF right from PF all 6 answers
There are four main ways in which electrons are emitted from the conductor including Thermionic emission, Electric field electron emission, Photoelectric emission, and Secondary emission.
What is a conductor?A conductor is a substance or material which allows electricity to flow through it. In a conductor, the electrical charge carriers, usually electrons or ions or charged particles, move easily from one atom to another atom when the voltage is applied.
Thermionic emission involves large amount of external energy in the form of heat is supplied to release free electrons from the metal.
In the electric field electron emission, electrons are emitted from the metal surface when the metals are placed in a very strong electric field.
During photoelectric emission, light is absorbed by the metals and this provides energy to the valence electrons in the conductor which break their bond with the parent atom and which are then released from the atom.
Valence electrons have kinetic energy, however they don't have enough energy to escape from the atom. During secondary emission, a high-speed electron from the conductor is bombarded with an atom, which provides energy for the valence electrons to break their bonds with their parent atom which are then released from the atom.
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grrr i don't have much time, help please T^T
will give brainlist and points! I'LL OWE YOU FOREVER
Answer:
2. ( b ) zero
3. ( c ) 10 s
4. Uniform then decreasing
Explanation:
2.
Since the motion is uniform, initial and final velocity will be 0, hence acceleration will be zero.
3.
Initial velocity ( u ) = 5 m/s
Final velocity ( v ) = 35 m/s
Acceleration ( a ) 3 m/s^2
To find : Time ( t )
Formula : -
t = v - u / a
= 35 - 5 / 3
= 30 / 3
t = 10 s
Answer:
See below ~
Explanation:
Q2
The uniform circular motion in the movement of object in a circular path with fixed and perpendicular on the direction of the motion acceleration.
dQ3
Substitute the values in : v = u + at35 = 5 + 3t3t = 30t = 10s (c)Q4
The vertical component for a projectile by acute angle on the horizontal axis changes from decreasing then increasing velocity.
dHow would a parachute fall on the surface of the moon ? Describe. The mass of the Jupiter is
[tex]19 \times 10 ^{27} kg[/tex]
and that of the sun is
[tex]2 \times 10 ^{30} kg[/tex]
If the gravitational force acting between them is
[tex]4.166 \times 10 ^{23} newton[/tex]
calculate the distance between their centres.
Explanation:
the answer is 2.46 × 10^12
Make the following conversion:
A) 60∘C into F
B)70∘C into K
C) 303∘K into C
D) 140∘F into C
If you don't know what I mean by C, F, K and ∘ it meaning is:
C- Celsius
F- Fahrenheit
K- kelvin
∘- degree sign
Answer:
Kelvin to Celsius: C = K - 273 (C = K - 273.15 if you want to
Adrian plays basketball with Kevin on a basketball court that is completely level. After Adrian makes as basket, their ball rolls to a complete stop. what forces acted on the ball to cause it to stop rolling?
A. acceleration and gravity
B. friction and acceleration
C. gravity and friction
D. magnetic forces and friction
What are the basic ingredients needed to form a hurricane? (Select all that apply.)
Question 1 options:
warm water
moist air
high pressure
strong winds that come together from different directions
strong winds that come together from different directions
In 1993, the gold reserves in the United States were about 8.490 x 10^6
Volume?
Let's see
Volume:-
Mass/Density8.49×10⁶/193000.000439×10⁶439m³what is importance of powder painting?
Answer:
It provides a more durable finish than liquid paints can offer, while still providing an attractive finish
Static electricity is a ____ charge.
missing
temporary
flowing
permanent
Answer:
static electricity is a flowing charges
Why we do not have a solar eclipse during every ""new moon"" phase.
Answer:
The solar eclipse stopped years ago due to the moon, sun, and earth's alignment not being able to sync like it did before.
Select the correct sentences on the image.
Matthew throws a ball straight up into the air. It rises for a period of time and then begins to drop. At which points in the ball's journey will
be the greatest force acting on the ball?
Answer:
when the ball falls down
Explanation:
because gravity is a very strong Force
Answer:
a
Explanation:a
What can spectroscopes tell us about a space object?
A. provide imagery
B. calculate location
C. determine temperature, chemical composition, and speed
D. determine temperature, chemical composition, and size
Answer:
The answer is C.
Explanation:
Spectroscopy can be very useful in helping scientists understand how an object like a black hole, neutron star, or active galaxy produces light, how fast it is moving, and what elements it is composed of.Answer:
[tex]\huge\boxed{\sf Option \ 3}[/tex]
Explanation:
Spectroscope:The device used to tell the properties of the spectral lines in an electromagnetic spectrum is called spectroscope. Properties of spectroscope:For any space object, spectroscope tells:Type of element the object is made of.Temperature of object.Chemical composition.SpeedMagnetic and electric field.Spectroscope also can tell the light intensity and their wavelength.[tex]\rule[225]{225}{2}[/tex]
Which of the following is an example of kin selection? A. A wolf attacks its cousin over territorial rights. B. A snake eats the eggs of another snake. C. A badger attacks a bear who was foraging for food. D. A bobcat fights a wolf to protect younger bobcats.
Answer: D. A bobcat fights a wolf to protect younger bobcats.
Ultrasound was used to check for cracks in an aeroplane wing. The ultrasound pulse would be reflected from any cracks and from the end of the wing. The diagram shows the oscilloscope trace produced by the echo. How far along the wing was the crack? The speed of sound in metal is 5000m/s.
The depth of the crack along the aeroplane wing is determined as 1.5 m.
Depth of the echo reflection
The depth of the crack in the wing from which the echo is heard is calculated as follows;
d = (vt)/2
From the image;
time 1 = 0.4 mstime 2 = 0.8 msd1 = (5000 x 0.4 x 10⁻³)/2
d1 = 1 m
d2 = (5000 x 0.8 x 10⁻³)/(2)
d2 = 2 m
Average depth
d = (d1 + d2)/2
d = (1 + 2)/2
d = 1.5 m
Thus, the depth of the crack along the aeroplane wing is determined as 1.5 m.
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Answer:The answer is 2
Which type of radiation is associated with high frequency waves?
Answer:
Gamma rays
Explanation:
have the highest energies, the shortest wavelengths, and the highest frequencies. Radio waves, on the other hand, have the lowest energies, longest wavelengths, and lowest frequencies of any type of EM radiation.
Two coherent sources of light are three
wavelengths out of phase. does light from these
sources experience constructive interference,
destructive interference, or no interference at all?
explain how you know.
Answer:
The difference phase = 3 λ
In terms of wavelength the difference of phase is zero so the sources would experience "constructive" interphase at that point.
If the light from the sources differed by 1/2, 3/2, 5/2 wavelengths etc, then the sources would be out of phase at that point.
One light ray labeled a striking a boundary with two light rays labeled b and c reflecting off. c is at the same angle and b is at an angle smaller than a. light ray d is into the material at the same angle of a and e into the new material is at a much larger angle. which pair shows the law of reflection? a and b a and c a and d a and e
Answer:
A & C
Explanation:
Answer:
A and C
Explanation:
A 0.025 kg piece of clay is thrown into a wall and has a speed of 9 m/s before it strikes the wall. Find the
change in momentum, of the clay and the impulse exerted on the clay if it does not bounce from the wall.
Answer:
The impulse experienced by the object equals the change in momentum of the object. In equation form, F • t = m • Δ v. In a collision, objects experience an impulse; the impulse causes and is equal to the change in momentum.
Explanation:
When A 0.025 kg piece of clay is thrown into a wall and has a speed of 9 m/s before it strikes the wall then change in momentum 22.5 kg.m/s² is and impulse is 0.225 Ns.
What is Momentum ?Momentum is defined as product of mass and velocity of the body. It is denoted by letter p and it is expressed in kg.m/s.
Mathematically p = mv.
it discuss the moment of the body. body having zero mass or velocity has zero momentum.
The dimensions of the momentum is [M¹ L¹ T⁻¹].
Given,
mass of the clay = 0.025 Kg
Speed of the clay = 9m/s
The momentum of clay is P = mv = 0.025×9 =0.225 kg.m/s
In this problem a piece of clay having mass 0.025 Kg, velocity of clay is 9m/s.
By using formula,
change in momentum of the clay = dp/dt
We must know about change in time in order to calculate change in momentum with respect to time.
Consider that the change in momentum is 0.01s.
dp/dt = p₂-p₁/t₂-t₁ = 0- 0.225/0.01 = 22.5 kg.m/s²
Impulse = dp/dt×Δt = 22.5×0.01 = 0.225 Ns
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Explore the role of friction when creating safety ramps and escalators. "Why is it important for people and object to move slowly on ramps and escalator?
The role of friction is of great importance when creating safety ramps and escalators because with the help of friction things move.
Why is it important to move objects slowly on ramps and escalator?It is important to move objects slowly on ramps and escalator because the ramps and escalator moves object in the opposite direction of gravity. If we did not move objects slowly, then the objects or a person get damaged.
So we can conclude that the role of friction is of great importance when creating safety ramps and escalators because with the help of friction things move.
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The four fundamental forces are c. strong force, weak force, electromagnetic force, gravity. b. nuclear force, gravity, tidal force, magnetic force. d. nuclear force, electromagnetic force, gravity, tidal force. a. strong force, weak force, electric force, magnetic force.
Answer:
The statements that describe the relationship between history and geography are:
Geography is the setting of the history's story.
Geography plays a role in historic events.
History affects geography, and geography influences history.
The second, third, and the fifth statements are the correct answers.
Explanation:
first 1=2=5=3=0=5=8=7=x=y
Two charged plates separated by 15 cm create a uniform electric field of 360 n/c. what is the potential difference between the plates?
When two charged plates are separated by a distance, the potential difference between the plates is 54 Volts.
What is uniform electric field?The electric field intensity which does not increase or decrease with time or remain constant is called the uniform electric field.
Given is the plates separated by distance d = 15 cm =0.15 m, electric field E= 360 N/C.
The relation between the electric field and voltage is
E=V/d
Substitute the values into the expression to get the potential difference V,
V = 360 x 0.15
V = 54 Volts
Thus, the potential difference between the plates is 54 Volts.
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Explain why you press against the seat when you take off fast at the beginning of the roller coaster ride. (Hint: relates to Newton’s first law)
Answer
When you are riding in a coaster car that is traveling at a constant speed, you only feel the downward force of gravity. But as the car speeds up or slows down, you feel pressed against your seat or the restraining bar. You feel this force because your inertia is separate from that of the coaster car.
Explanation:
Two students are observing the motion of a Mercedes Benz. They calculate, with various handy dandy gadgets, that the Benz is changing its speed constantly by 2.2 m/s every second while moving along a straight road.
Student 1: The Benz is traveling at a constant velocity. Therefore at the end of 2 seconds it's speed will still be 2.2 m/s.
Student 2: No, the Benz is not traveling at constant velocity. At the end of two seconds the speed would have increased by 4.4 m/s.
Which student do you agree with and why? Discuss all parts of all statements made by both students. Saying I agree with student 1 or 2 or neither will not suffice.
Student 2 is correct. The Benz is not traveling at constant velocity. At the end of two seconds the speed would have increased by 4.4 m/s.
Final velocity of the Benz
The final velocity of the benz is determined by using first kinematic equation;
v = u + at
where;
u is the initial velocitya is the final velocity = (2.2 m/s) / 1s = 2.2 m/s²t is the timev = 2.2 + (2.2 x 2)
v = 6.6 m/s
Change in velocityΔv = 6.6 m/s - 2.2 m/s = 4.4 m/s
Thus, student 2 is correct. The Benz is not traveling at constant velocity. At the end of two seconds the speed would have increased by 4.4 m/s.
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Two rocks, A and B, are thrown horizontally from the top of a cliff. Rock A has an initial speed of 10 meters per second and rock B has an initial speed of 20 meters per second. How would you describe the time it takes for the rocks to reach the ground and the horizontal distance they travel?
Answer:
i need help
Explanation:
which of the following is correct based on the given illustration?
A. south Pole experiences autumn while North Pole experiences Winter
B. South Pole experiences summer while North Pole experiences Spring
C. North Pole experiences summer while South Pole experiences Winter
D. North Pole experiences winter while South Pole experiences summer
*The Subject is Science btw*
An athlete wants to refill an old punching bag used for training, as shown in the picture. When refilled, the bag will rip if it is kicked with too much force
The maximum force that the athlete exerts on the bag is NEGATIVE 1,500 N and in the OPPOSITE DIRECTION of the force that the bag exerts on the athlete.
Newton's third law of motionNewton's third law of motion states action and reaction are equal and opposite. That is the force applied to an object is equal in magnitude to force experienced by the object but in opposite direction.
From the given question, when the bag exert a certain on the athlete, the athlete also exerts similar force to the bag but in opposite direction.
Thus, the complete sentence is as follows;
The maximum force that the athlete exerts on the bag is NEGATIVE 1,500 N and in the OPPOSITE DIRECTION of the force that the bag exerts on the athlete.
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is space expanding within clusters of galaxies? why or why not?
No, since their gravity is powerful enough to keep them together even while the universe expands as a whole. Space is not expanding within clusters of galaxies.
What is a galaxy?A galaxy is a massive clump of gas, dust, and billions of stars and their solar systems bound together by gravity.
No, since their gravity is powerful enough to keep them together even while the universe expands as an entire.
Hence,space is not expanding within clusters of galaxies.
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A generator is operating with 5% droop primary control. The generator is rated for 100 kW. Its secondary power command at this point in time (in other words, the power commanded to produce at 60 Hz) is 67 kW. The grid frequency is currently 59.9 Hz. What is the generator power
The generator power will be 59 kW. Power drop is the main factor for finding the generated power.
What is the power rating?The maximum power input allowed to pass through a piece of equipment is known as the equipment's power rating.
Power drop = 5%
The relation of the frequency change with the power drop is;
[tex]\rm \frac{df}{dp} =5\%\\\\ \frac{f_{rated-f_1}}{P_{rated}-P_1}=0.05\\\\ \frac{f_{rated-60}}{100-61}=0.05\\\\ f_{rated}=61.95[/tex]
For the grid frequency, 59.9 Hz
[tex]\rm \frac{f_{rated-f_2}}{P_{rated}-P_2}=0.05[/tex]
[tex]\rm \frac{61.95-f_2}}{100-P_2} =0.05\\\\ 100-P_2 =20(61.95-59.9)\\\\P_2=100-41 \\\\ P_2=59 \ kW[/tex]
Hence, the generator power will be 59 kW.
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