Answer:
15
Explanation:
The mass number is defined as the total number of protons and neutrons. The atomic number is total number of protons. And since we have the mass number and number of neutrons, we can use simple subtraction (30 - 15) to find that the atomic number is 15.
The atomic number is found by subtracting the number of neutrons from the mass number; thus, with 15 neutrons and a mass number of 30, the atomic number is 15.
The atomic number can be determined by subtracting the number of neutrons from the mass number. Given that the atom contains 15 neutrons and has a mass number of 30, we can find the atomic number by using the formula: atomic number = mass number - number of neutrons.
This yields an atomic number of 15 (30 - 15 = 15), which indicates that there are 15 protons in the atom.
The four best metallic conductors are: A. gold B. cadmium C. alloys D. copper E. silver F. sodium G. aluminum H. iron I have to pick 4
Answer:
Explanation:
I can give you four for certain.
Copper
Gold
Silver
Aluminum
Heat transfer by radiation depends on ____
Answer:
Infrared
Explanation:
This is the electromagnetic spectrum just above the visible light spectrum with higher energy (and higher frequency). This electromagnetic radiation is responsible for feeling the heat when you place your hand close to the side of a fire. It is also harnessed in night vision where bodies that emit some form of heat are visible due to their emission of IR.
Heat transfer by radiation primarily depends on the surface area, the fourth power of the absolute temperature, and the emissivity of the object. This is dictated by the Stefan-Boltzmann law of radiation. All objects based on their temperature difference with the surrounding environment absorb and emit radiation leading to heat transfer.
Explanation:Heat transfer by radiation depends on several factors. The primary ones are the surface area of the object, the fourth power of the absolute temperature, and the emissivity of the object. This can be represented by the equation from the Stefan-Boltzmann law of radiation: = oеAT4, where o is the Stefan-Boltzmann constant, A is the surface area of the object, T is the absolute temperature and e is the emissivity.
All objects release and absorb radiation. The net rate of heat transfer by radiation (absorption minus emission) relates to both the temperature of the object and the surrounding environment. For example, on a sunny day, the radiation from the sun warms your skin, demonstrating the principle of radiative heat transfer.
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racquetball strikes a wall with a speed of 30 m/s and rebounds in the opposite direction with a speed of 26 m/s. The collision takes 20 ms. What is the average acceleration of the ball during the collision with the wall?
Vo = 30 m/s Vf = 26 m/s, t = 20ms = 0.02s
A = Vo + Vf / t
A = 30 + 26 / 0.02
A = 56 /0.02
A = 2800 m/s^2
The average acceleration of the racket is 2,800 m/s²
The given parameters include;
initial speed of the racket, u = 30 m/s
recoil velocity of the racket, v = 26 m/s
time of collision, t = 20 m/s
To find:
the average acceleration of the racketLet the backward or recoil velocity be in negative direction
The average acceleration of the racket is calculated as;
[tex]average \ acceleration \ =\frac{\Delta \ velocity}{\Delta \ time} = \frac{v - u}{t} \\\\average \ acceleration \ = \frac{-26 - 30}{20 \times 10^{-3}}= \frac{-56}{20 \times 10^{-3}} = -2,8 00\ m/s^2\\\\magnitude \ of \ average \ acceleration = 2,800 \ m/s^2[/tex]
Thus, the average acceleration of the racket is 2,800 m/s²
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During the Water Wheel simulation you were able to change the flow of water
through the system. The water flow represents
the flow of neutrons
the flow of protons
the flow of electrons
the flow of photons
Answer:
The flow of photons
Explanation:
Final answer:
The flow of water in the Water Wheel simulation represents the flow of electrons, similar to how electrons flow through a circuit.
Explanation:
The flow of water in the Water Wheel simulation represents the flow of electrons. Just like water flowing through a system, electrons can flow through a circuit, powering devices and creating electric current. Changing the flow of water in the simulation is similar to adjusting the flow of electrons in a circuit by changing the voltage or resistance.
the words bin and bean. rot and rat are examples of (blank)
Answer:
the correct answer is homonyms
Explanation: Hope it helped
Answer:
MINIMAL PAIRS
Explanation:
got it correct on plato
suppose you increase your walking speed from 6 m/s to 13 m/s in a period of 3 s. what is your acceleration
Answer:
2⅓ m/s²
Explanation:
Average acceleration is the change in velocity over change in time.
a = Δv / Δt
a = (13 m/s - 6 m/s) / 3s
a = 2⅓ m/s²
a ≈ 2.33 m/s²
How much heat is absorbed by a 70g iron skillet when its temperature rises from 13oC to 28oC?
The answer is:
The heat absorbed by the iron skillet is equal to 473 Joules.
Why?To solve the problem, we need to use the formula to calculate the quantity of heat absorbed, also, we need to remember that specific heat of the iron, which is equal to:
[tex]s=\frac{0.45J}{g*\°C }[/tex]
Where,
J, is the energy transferred.
g, is the mass of the object or substance.
°C, is the temperature measured in Celsius degrees.
We can calculate the heat absorbed using the following equation:
[tex]q=m*dT*s[/tex]
Where,
q, is the heat absorbed
m, is the mass of the object
dT, is the change in temperature
s, is the specific heat of the substance.
We are given the following information:
[tex]mass=70g\\dT=28\°C-13\°C=15\°C\\s=\frac{0.45J}{g*\°C }[/tex]
So, substituting and calculating, we have:
[tex]q=m*dT*s[/tex]
[tex]q=70g*15\°C*\frac{0.45J}{g*\°C }=472.5J=473J[/tex]
Hence, the heat absorbed is equal to 473 Joules.
Have a nice day!
What's one indirect consequence of building seawalls?
Seawalls, groins, jetties and other shoreline stabilization structures have had tremendous impacts on our nation's beaches. Shoreline structures are built to alter the effects of ocean waves, currents and sand movement. They are usually built to "protect" buildings that were built on a beach that is losing sand.
Answer:
Seawalls are made for coastal defense purposes
Explanation:
Seawalls are massive structures which are designed to prevent coastal erosion and other damages due to wave action during huge storms such as hurricanes.
My family used to live near one. It are very satisfying to watch during rain storms, because you can hear the sound of the rain falling on top of it. I also loved watching the waves hit the sea wall then roll back down.
Hope this helps. ( Sorry I go a little carried off)
Given the scenario: A 45 kg. object is being pushed north with a force of 8N, and at the same time, it is been pushed east with a force of 6N. What will the magnitude and direction be of the resultant vector?
Answer:
10 N, [tex]53.1^{\circ}[/tex] north-east
Explanation:
The two forces applied on the object are perpendicular to each other, so we can find the magnitude of their resultant by using the Pythagorean theorem:
[tex]R=\sqrt{(6 N)^2 + (8 N)^2}=10 N[/tex]
The direction of the force instead is given by
[tex]\theta = tan^{-1} (\frac{F_n}{F_e})[/tex]
where F_n is the force pointing north, and F_e is the force pointing east, and the angle is measured with respect to the east direction. Substituting,
[tex]\theta=tan^{-1} (\frac{8 N}{6 N})=tan^{-1} (1.333)=53.1^{\circ}[/tex]
Which pair of properties apply to both sound and electromagnetic waves?
A) Both waves carry energy and refract.
B) Both waves are longitudinal and carry energy.
Eliminate
C) Both waves are transverse and need a medium.
D) Both waves carry energy and do not need a medium to travel through.
The answer would be A because sound waves and electomagnetic waves carry energy and they can both refract.
Answer: A. Both waves carry energy and refract.
Explanation: Rarefaction is where vibrating particles are spread apart.
A small slope on a velocity vs. time graph indicates a small acceleration
Answer:on apex the correct answer is true
Explanation:
At which landing site would the lander have the greatest amount of gravitational potential energy? W X Y Z
Answer: the answer would be X
Explanation:
Answer:
X
Explanation:
The energy possessed by the position of the body is called gravitational energy. The formula for the gravitational potential energy is given by
U = m x g x h
Gravitational Potential energy of W:
m x g x h = m x 1.6 x 32 = 51.2 m
Gravitational Potential energy of X:
m x g x h = m x 3.7 x 16 = 59.2 m
Gravitational Potential energy of Y:
m x g x h = m x 1.6 x 35 = 56 m
Gravitational Potential energy of Z:
m x g x h = m x 3.7 x 12 = 44.4 m
The gravitational potential energy is maximum for X
Read each scenario and then answer the question scenario a 120 J of work is done in 6 seconds Scenario b 160 J of work is done in 8 seconds scenario c 200 J of work is done in 10 seconds which scenario uses the most power
Answer:
all scenarios are using the same power
Explanation:
we know that power is defined as P(Watts)=W(Joules)/t(seconds).
When applying this formula to each of the scenarios we find:
[tex]\frac{120J}{6s}=\frac{160J}{8s}=\frac{200J}{10s}= 20W[/tex]
Done
Which of the following type of personal debts is usually considered wise and justified? A. credit card purchases of luxuries that you want immediately B. a loan for the car you have always dreamed about C. money to pay off other debts and interest D. home mortgage
Answer:
C. Money to pay off other debts and interest
Money to pay off other debts and interest are usually considered wise and justified.
Answer:Option c
Explanation:
Personal loans give persons an access to funds that can be used as their wish and they are unsecured. This means that they do not need you to put down collateral for obtaining the loan.
A personal loan usually has higher rate of interests than that of secured loan. They offer lower rate of interest than credit cards. It is advisable to use personal loans to pay off debts form credit cards will support you in saving interests and help you to get out of the debt faster period of time.
A diode is a semiconductor that is used to --
allow current to flow only in one direction
turn the flow of electricity on and off
amplify electrical signals
create a magnetic field
Answer:
Allows current to flow in one direction.
Explanation:
Answer:Diodes can be used as rectifiers, signal limiters, voltage regulators, switches, signal modulators, signal mixers, signal demodulators, and oscillators. The fundamental property of a diode is its tendency to conduct electric current in only one direction.
Explanation:
Which statement about subatomic particles is not true?
A) protons and neutrons have almost the same mass.
B) protons and neutrons have he same charge.
C) unlike protons and electrons neutrons have no charge.
D) protons and electrons have opposite charges.
Answer:
B. is the right answer
A) True. protons and neutrons have almost the same mass.
B) Not true. Booo ! protons and neutrons have the same charge.
C) True. unlike protons and electrons neutrons have no charge.
D) True. protons and electrons have opposite charges.
A leaf floating down from a tree is an example of an object in free fall.
Answer:
Oi, mate its false
Explanation:
because if an leaf floats down from a tree it is not considered an object for a free-fall
Answer:
False
Explanation:
solve 305809 square root by division method
The Doppler effect is the change in
of a wave due to the motion of the source and/or receiver.
Yes indeed, that is a true statement. Truer words are seldom written, and I could not agree with you more.
In case you are asking a question, I can kind of see how this might be a question if there is a blank after "... the change in ..." that is to be filled with one or more new words.
If that is the situation, then the blank can be filled with "frequency or wavelength" .
The Doppler effect is the change in the wavelength (or frequency) of energy in the form of a wave due to the motion of the source and/or receiver.
What is the Doppler effect?Doppler effect is the change in energy wavelength (or frequency) in the form of waves, for example, sound or light.As a result of the motion of either the source or the receiver of the waves, the effect is named for the Austrian scientist Christian Doppler, who demonstrated the effect for sound.If the source of a wave is moving towards a receiver, the frequency at which the waves are received is higher than the frequency at which they are sent out.The formula of the Doppler effect is,f’ = f (c + vr) / (c + vs)
where,
f’ = apparent frequencyf = actual frequencyc = speed of sound waves in the mediumvr = velocity of the receiver/observer with respect to the mediumvs = velocity of the source with respect to the mediumTo know more about the Doppler effect, refer to:
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For a stationary observer, when the source of sound is moving, its pitch appears to change.
T.
or
F.
Answer:
I believe it is true.
Explanation:
Hope my answer has helped you!
Hello There!
This is "True"
For a stationary observer, when the source of sound is moving, its pitch appears to change.
When particles spread out due to an increase of thermal energy this is called?
This sounds like thermal expansion.
a book is sitting on a desk. what best describes the normal force acting on the book
the upward force the desk pushes on the book.
from the free body diagram of the book, it is clear that on the book, there are two forces acting.
1) normal force F by the desk in Upward direction.
2) force of gravity by earth in downward direction.
The Upward normal force by the desk on the book balances the force of gravity by earth in downward direction. that is why the book remains stationary on the desk.
The normal force acting on the book is a supporting force that is equal in magnitude and opposite in direction to the book's weight, keeping it in static equilibrium.
Explanation:A book is sitting on a desk, and the best description of the normal force acting on the book is that it is a supporting force exerted by the desk that is perpendicular to and away from the surface. This force is necessary to support the weight of the book, counteracting the force of gravity and preventing the book from accelerating downwards. Newton's third law of motion tells us that this normal force is equal in magnitude and opposite in direction to the force that the book exerts on the desk, which is its weight due to gravity. In this instance, if the desk exerts an upward force of 32 N, this is because the book's weight (force due to gravity) is also 32 N, resulting in a state of static equilibrium where the net external force on the book is zero.
HELP ASAP GIVING BRAINLIEST AND 70 POINTS
Think about the process of heating water, the heating and upward motion of hot steam and air, and a spiral spinning. For these events, list each form of energy associated with the heat source, the water, the steam and air, and spiral. Give an explanation why.
KINETIC ENERGY FORMS:
- Motion energy
- Thermal energy
- Electric energy
- Vibrational energy
- Radiant energy
POTENTIAL ENERGY FORMS:
- Gravitational Potential energy
- Elastic Potential energy
- Chemical Potential energy
- Electric Potential energy
- magnetic potential energy
- nuclear potential energy
Answer: Thermal and Elastic
Explanation:
Answer:
thermal and gravitational potential
Explanation:
because
when we gives thermal energy then
its energy is change into kinetic energy
and
any object goes up then its kinetic energy change into gravitational potential energy
Plz help, its for my CFE in physical science honors.
Glen is explaining the relationship between the wavelength and frequency of electromagnetic radiation to his friend, Harold. Which of the following would be a correct explanation of this relationship?
A. All electromagnetic waves have the same frequency, but different wavelengths
B. If a wave has a long wavelength, it will have a low frequency.
C. If a wave has a low frequency, it will have an equally low wavelength.
D. The frequency of a wave is not related to its wavelength.
Answer: B
f=c/wavelength
So we see if the wavelength is larger then the frequency gets smaller and the smaller the wavelength the higher the frequency.
Any questions feel free to ask. Thanks
Final answer:
Glen's correct explanation is that if a wave has a long wavelength, it will have a low frequency, showing the inverse relationship between frequency and wavelength for electromagnetic waves.
Explanation:
Glen is explaining the relationship between the wavelength and frequency of electromagnetic radiation to his friend, Harold. The correct explanation of this relationship is embodied in option B: If a wave has a long wavelength, it will have a low frequency. This principle is underpinned by the universal speed of light (c), at which all electromagnetic waves travel. The relationship among these characteristics can be represented by the equation c = fλ, where c is the speed of light, f is the frequency, and λ is the wavelength. Thus, for all electromagnetic waves, a greater frequency implies a smaller wavelength and vice versa, demonstrating an inverse relationship between these two properties.
Which is a key criterion for the design of an automobile bumper?
A. It must absorb shock.
B. It must improve fuel efficiency.
C. It must be inexpensive to manufacture.
D. It must protect the vehicle's occupants.
I think the answer is A
Answer: The answer is A
Explanation: The bumper is the first part of an automobile to be impacted when in a head-on accident
A box is pulled up a rough ramp that makes an angle of 22
degrees with the horizontal surface. The surface of the
ramp is the x-plane,
What is the magnitude of the force of tensionit te ne
force in the direction of 98 N2
57N
139 N
178N
183N
F = 650N
F = 700NFO
Answer:
139 N
Explanation:
Thats the answer on e2020
The significance of the force of hysteria force inside the path of 98 N2 is 139 N.
SOLUTION:
given force = 98 N
the angle of pulling = 22 °
force = 98 cos22°
= 139 N
What's the importance of the pressure?The importance of the pressure is the variety that represents the energy of the pressure. for instance: think the force is = 10 N closer to the east. 'towards east' shows the path at the same time as '10' is the importance of the pressure. So basically, magnitude is the 'value' or 'amount' of any bodily amount.
The bodily force exerted on an item. The force implemented is perpendicular to the surface of gadgets in line with unit area. The simple formula for stress is . Unit of stress is Pascals (Pa).
A simple instance of strain can be visible via preserving a knife to a bit of fruit. if you hold the flat part of the knife against the fruit, it won't cut the floor. The pressure is spread out of a huge place.
What is a pressure solution?The frenzy or pull on an item with mass that causes it to alternate its pace. Force is an outside agent able to change the state of relaxation or movement of a particular frame.
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Question is In Image Provided
Answer:
i would think the first two, but i cant be sure.
Explanation:
Which vertebrate lays its eggs on land?
a. lizard
b. frog
c. newt
d. catfish
Answer: A lizard :)
Explanation:Frogs lay there eggs in the water for example a underwater stick. Newts also lay there eggs underwater or in a underwater enviroment. And catfishes also lay they eggs under water. Where i live (Florida) there are millions of lizards and sometimes i find them on the ground or on land. I also did some research and its a fact that lizerds do in fact lay there eggs on the ground.
I really hope this helps have a great rest of your day :) :) :) :) :)
Drop the ball on the floor and observe its motion. Identify all the energy forms associated with the ball at these times:
about to be dropped
falling down
hitting the floor
moving back up
Answer:
about to be dropped-------------gravitational potential energy
falling down.................................Kinetic energy
hitting the floor.............................potential energy
moving back up...........................Kinetic energy
Explanation:
When the ball is about to be dropped it possesses potential energy.This is the energy stored in an object.When the ball is released, the potential energy will be converted to kinetic energy.Kinetic energy is the energy an object has due to its motion.When the ball hits the floor, energy is lost in form of siund and heat.The kinetic energy when falling will be transformed to potential energy which is lesser than the initial one when the ball was about to be dropped.The ball bounces back after hitting the floor.The potential energy is converted back to kinetic energy .
Answer:
About to be dropped-Gravitational potential energy
Falling down-Kinetic energy
Hitting the floor-Potential energy
Explanation:
What kind of energy is represented by KE?
Answer:
Explanation:
Depends on what you are measuring.
For example, in Chemistry, KE is measuring temperature. Temperature is the average of all the molecules present and their motion (using a gas as our base).
In physics, KE at beginning levels, is the speed of a moving object.