Answer:
The number of electrons in a neutral atom is equal to the number of protons. The mass number of the atom (M) is equal to the sum of the number of protons and neutrons in the nucleus. The number of neutrons is equal to the difference between the mass number of the atom (M) and the atomic number (Z).
Explanation:
happy to help ya:)
What is the work done by a force equivalent to the weight of 100kg that moves an object 200km in 7.0min?
Please guys can somebody helps me :(
The work done by a force equivalent to the weight of 100 kg that moves an object 200 km in 7.0 min would be 196000 kJ.
What is work done?The total amount of energy transferred when a force is applied to move an object through some distance
The work done is the multiplication of applied force with displacement.
Work Done = Force × Displacement
As given in the problem we have to calculate the work done by a force equivalent to the weight of 100 kg that moves an object 200 km in 7.0 min.
The weight of the 100 kg = 100 × 9.8
= 980 N
The work done = 980 × 200 × 1000
= 196000000
= 196000 kJ
Thus, the work done by a force equivalent to the weight of 100 kg that moves an object 200 km in 7.0 min would be 196000 kJ.
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An 8000 kg engine pulls a train of 5 wagons, each of 2000 kg, along a horizontal track. If the engine exerts a force of 40000 N and the track offers a friction force of 5000 N, then calculate: the force of wagon 1 on wagon 2?
Answer:
The net force of engine on total mass of train is 35000 N
The net acceleration is 1.944 m/s²
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A ball has a mass of 0.25 kg and is moving to the right at 1.0 m/s. It hits a ball of mass 0.15 kg that is initially at rest. After the collision, the 0.15 kg ball moves off to the right with a velocity of 0.75 m/s.
What is the final velocity of the 0.25 kg ball?
0.42 m/s to the right
0.42 m/s to the left
0.55 m/s to the right
0.55 m/s to the left
Answer:
C. 0.55 m/s towards the rightExplanation:
Using the conservation of law of momentum which states that the sum of momentum of bodies before collision is equal to the sum of the bodies after collision.
Momentum = Mass (M) * Velocity(V)
BEFORE COLLISION
Momentum of 0.25kg body moving at 1.0m/s = 0.25*1 = 0.25kgm/s
Momentum of 0.15kg body moving at 0.0m/s(body at rest) = 0kgm/s
AFTER COLLISION
Momentum of 0.25kg body moving at x m/s = 0.25* x= 0.25x kgm/s
x is the final velocity of the 0.25kg ball
Momentum of 0.15kg body moving at 0.75m/s(body at rest) =
0.15 * 0.75kgm/s = 0.1125 kgm/s
Using the law of conservation of momentum;
0.25+0 = 0.25x + 0.1125
0.25x = 0.25-0.1125
0.25x = 0.1375
x = 0.1375/0.25
x = 0.55m/s
Since the 0.15 kg ball moves off to the right after collision, the 0.25 kg ball will move at 0.55 m/s towards the right
If a wave were to hit a flexible, moveable surface what will it do?
what ever force the wave hit it at (on the x-axis) would create another wave from the force of the first wave. though the wave would be smaller because of other forces
Convert 84 ounces to milliliters
Answer: 2494.18 millilitres
Explanation:
There is 1 ounce per 29.5735 mL
Take 84 ounces and multiply by the 29.5735.
2484.18 mL
Answer: 2,484,18
Explanation:
Which is the correct equation for calculating the kinetic energy of an object?
COM
1
1
KE = mgh
KE = mu?
KE = at
KE =
492
O
) Intro
✓ Done
DO
Answer:
KE = 1/2(m)(v^2)
Explanation:
Answer:
I hope this helps
Explanation:
Is thermal energy the most common type of energy lostnin electrical devices
Answer:
Yes
Explanation:
The most common energy that is lost in electronic devices is in the form of heat energy.
Which of the following devices would you expect to consume the most energy for each hour that it operates?
An astronaut is on a new planet. She discovers that is she drops a space rock from 12m above the groundnut has a final velocity of 3m/s just before it strikes the planet surface. What is the acceleration due to gravity on the planet?
Answer:
-0.375 m/s2
Explanation:
To find the acceleration due to gravity in this planet, we can use the Torricelli formula of UALM (uniformly accelerated linear motion):
V^2 = Vo^2 + 2*a*S
Where V is the final velocity, Vo is the inicial velocity, a is the acceleration and S is the total displacement.
With V = 3, Vo = 0 and S = -12, we have:
3^2 = 0^2 - 2*a*12
24a = -9
a = -9/24 = -0.375 m/s2
Q2. Fill in the blanks:
North Pole of a magnet will.....
.. North pole of another magnet.
South Pole of a magnet will.
North pole of a another magnet.
Needle of a compass lines up with the......
of a magnet.
You can find the shape of a magnetic field using........
...... and also a plotting.
Answer:
repel , attract,l am sure with these two blanks only
Answer:
Magnetic fields
A magnet creates a magnetic field around it. You cannot see a magnetic field, but you can observe its effects. A force is exerted on a magnetic material brought into a magnetic field. The force is a non-contact force because the magnet and the material do not have to touch each other.
The property of matter that resists changes in motion is called
inertia.
friction.
weight.
gravity.
Answer:
friction
Explanation:
The property of matter that resists changes in motion is called friction. Details about friction can be found below.
What is friction?Friction is a force that resists the relative motion of two bodies in contact.
Friction is a resisting force that is experienced when two bodies are moving over one another, hence, is said to resist changes in motion. Examples of cases of friction are as follows:
Vehicle moving over a tarred roadSliding of both hands over one anotherTherefore, the property of matter that resists changes in motion is called friction.
Learn more about friction at: https://brainly.com/question/13000653
Question 1(Multiple Choice Worth 4 points) The star named Canopus has a declination of approximately –52°. Which of these statements is correct about Canopus? It is 52° above the celestial equator. It is 52° below the celestial equator. It is 52° to the left of the celestial equator. It is 52° to the right of the celestial equator.
Answer:
It is 52° below the celestial equator.
Explanation:
The declination is the angle in degrees measured north (+) or south (-) of the an imaginary line called the celestial equator.
The celestial equator is a projection of the earth's equator on the celestial sphere. imaginary
The star named Canopus has a declination of approximately –52°.
Since the angle is negative, this shows that it is south or below the celestial equator and at 52° south of the celestial equator.
Thus, the star named Caponus is 52° below the celestial equator.
Answer:
the answer is 'it is 52° below the celestial equator.' :))
Explanation:
its the correct answer on the quizz,,, good luck!! :3
5. Ultraviolet rays are potentially harmful to us primarily due to their
A. intensity
B. high frequency.
C. long wavelength.
D. amplitude.
Answer:
A
Explanation:
Ultraviolet light occurs after white light;
Do you know why gamma rays are harmful because of their high frequency and short wavelength leading to high intensity.
Though the frequency is higher than that of white light, its because of its intensity.
Ultraviolet rays comes handy from depletion of the earth's ozone layer
Hence harmful Ultraviolet rays from the sun attacks the skin Leading to Sun burn and other things.
Answer:
High frequency is the answer
Explanation:
Took pf test is was 100% correct
A sled is moving down a steep hill. The mass of the sled is 50 kg and the net force acting on it is 20 N. What must be done to find the acceleration of the sled? Check all that apply.
-The force of gravity must be broken into its parallel and perpendicular components.
-Acceleration can be found by dividing the net force by mass.
-Acceleration can be found by multiplying the net force by mass.
-The magnitude of the force components must be multiplied by gravity.
-Trigonometry can be used to solve for the magnitude of the force components.
-Net force must be found before acceleration can be found.
Answer:
-The force of gravity must be broken into its parallel and perpendicular components.
-Acceleration can be found by dividing the net force by mass.
-Trigonometry can be used to solve for the magnitude of the force components.
-Net force must be found before acceleration can be found.
Answer:
A, B, E, F
Hope this helps!!! :)
Which statement correctly compares sound and light waves?
A.Both light and sound waves need matter to carry energy from one place to another.
B.Neither light nor sound waves need matter to carry energy from one place to another.
C.Light waves carry energy parallel to the motion of the wave, while sound waves carry energy perpendicular to it.
D.Sound waves carry energy parallel to the motion of the wave, while light waves carry energy perpendicular to it.
Answer:
The correct answer is D.Sound waves carry energy parallel to the motion of the wave, while light waves carry energy perpendicular to it.
Explanation:
Just got the answer correct.
Which is best supported by the data in the chart?
A: Current W flows at a higher rate than Current Z.
B: Current Y flows at a lower rate than Current X.
C: Current X has a lower potential difference than Current Y.
D: Current Z has a greater potential difference than Current W.
Answer:
Option C: Current X has a lower potential difference than Current Y.
Explanation:
The chart above only shows the potential difference of difference current.
A careful observation of the chart shows that Current X has a lower potential difference than Current Y.
Answer:
Answer:
Option C: Current X has a lower potential difference than Current Y.
Explanation:
The chart above only shows the potential difference of difference current.
A careful observation of the chart shows that Current X has a lower potential difference than Current Y.
Explanation:
A car drives 16 miles south and then 12 miles west. What is the magnitude of the car’s displacement?
Answer:20 miles
Explanation:
the speed of a tortoise and a hare are 1m/s and 3m/s. the mass of hare is 5kg and the tortoise is 20kg. which has greater momentum? WITH MATHEMATICAL EXPLANATION PLZ!!
Answer: tortoise
Explanation:
Given the following :
Speed of tortoise = 1m/s
Speed of hare = 3m/s
Mass of hare = 5kg
Mass of tortoise = 20kg
Momentum = product of Mass and velocity
Momentum of hare = mass of hare × Velocity of hare
Momentum of hare = 5kg × 3m/s = 15kgm/s
Momentum of tortoise = mass of tortoise × Velocity of tortoise
Momentum of tortoise = 20kg × 1m/s = 20kgm/s
Therefore, tortoise has a greater momentum than hare.
Answer:
The equations are both written in slope-intercept form, so I can see that the slope of one equation is 2 and the other is 8. If the slopes of lines are different, they will always intersect at a point.
Explanation:
Conductivity in metallic solids is due to the presence of free
Answer:
due to the presence of fee electrons.
Explanation:
these electrons conduct electric current.
Conductivity in metallic solids is due to the presence of free electron. No of the electron will decide the flow of the electric current.
What is the charge?When the matter is put in an electromagnetic field, it has an electric charge, which causes it to experience a force. A positive or negative electric charge can exist.
Charges that are similar repel each other, whereas charges that are dissimilar attract each other. The term “neutral” refers to an item that has no net charge.
A valence electron is an electron in the outermost shell. Hence, associated with an atom that can experience the innovation of a chemical bond if the outer shell is not closed.
Conductivity in metallic solids is due to the presence of free electron.
Hence, electron is the correct answer for blank.
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A robot starts from a certain point and moves east for a distance of 5.0 meters, then goes north for 3.0 meters, and then turns west for 2.0 meters. a. What are the x-y coordinates for the resultant vector? b. What is the magnitude of the resultant vector for the robot?
Explanation:
It is given that, a robot starts from a certain point and moves east for a distance of 5.0 meters, then goes north for 3.0 meters, and then turns west for 2.0 meters.
Let east is +x, west is -x north is +y.
When it moves east for a distance of 5.0 meters, it means (5,0)
When it goes north for 3.0 meters, and then turns west for 2.0 meters, it means (0,3) +(-2,0)
(a) x-y coordinates for the resultant vector is (3,3)
(b) The magnitude of the resultant vector for the robot is given by :
[tex]R=\sqrt{3^2+3^2} \\\\R=4.24\ m[/tex]
Which phrase provides the best context clue for the meaning of the word tabulate?
Answer:
round and count
Explanation:
means arrange, order, organize, etc
Answer:^what he meant was record and count
Explanation:
A critical period begins and ends abruptly
Answer:
yes
Explanation:
A critical period?
A.begins and ends abruptly
B.begins and ends gradually
C.is unaffected by stimuli
D.is unlikely to impact development
correct answer (A.begins and ends abruptly )
Answer:
yes it is true
Explanation:
i took a test and that is true
Okno okrętu podwodnego ma powierzchnię 0,3 m2 i znajduje się na głębokości, na której ciśnienie wywierane przez słup wody wynosi 500 kPa. Dokończ zdanie. Wartość siły parcia wody na okno wynosi.
Answer:
The value of the water pressure force on the window is 150,000 N.
Wartość siły nacisku wody na okno wynosi 150000 N.
Explanation:
English Translation
The submarine window has an area of 0.3 m2 and is located at a depth at which the pressure exerted by the water column is 500 kPa. Finish the sentence. The value of the water pressure force on the window is.
Solution.
Pressure exerted by a force on a surface area perpendicular to the line of action of that force is given by the formula
P = (F/A)
where F = applied force, in this case, water pressure force on the window = ?
A = Area upon which the force is acting = Area of the window = 0.3 m²
P = 500 kPa = 500,000 Pa
500,000 = (F/0.3)
F = 500,000 × 0.3 = 150,000 N
In Polish/Po Polsku
Ciśnienie wywierane przez siłę na pole powierzchni prostopadłe do linii działania tej siły jest określone wzorem
P = (F / A)
gdzie F = przyłożona siła, w tym przypadku siła nacisku wody na okno =?
A = Obszar, na który działa siła = Powierzchnia okna = 0,3 m²
P = 500 kPa = 500000 Pa
500,000 = (F/0.3)
F = 500,000 × 0.3 = 150,000 N
Hope this Helps!!!
Mam nadzieję że to pomoże!!!
A crate is being pushed at a constant speed across the floor. The gravitational force on the crate is 80N, and the applied force is 50N. What are the other force(s) acting on the crate?
Answer:
Friction force.
Explanation:
Force is defined as a pull or push acting on an object that changes the speed or direction of the motion.
When a crate is is being pushed at a constant speed across the floor along with gravitational force and the applied force, there will be a force of friction applied by the floor on the opposite direction of applied force.
Friction always opposes the applied force and resist the changes in the motion of the object.
Hence, the correct option is Friction force.
few girls can resist flattery
Answer:
yes
Explanation:
Because they have logic duh!!! ;D
that is true. most ppl in general cant resist flattery. some can resist tho, bc they are smart.
A football player kicks a ball horizontally off a hill with an initial velocity of 42.0 m/s. It travels a horizontal distance of 59.2m. How y'all was the hill he kicked the ball off of?
Explanation:
.........................
What is a closed system?
A. A system in which no work is done
B. A system that can exchange matter with its surroundings
C. A system that cannot exchange matter with its surroundings
D. A system in which no heat flows
Answer:
C
Explanation:
A closed system does not allow transfer of matter in or out of the system
1. A body whose mass is 2 kg and has a volume of 500cm just floats
when completely immersed in a liquid. Calculate the density of the
liquid
Answer:
Density equals mass over volume so 2 divided 500
Describe the mechanical energy and the thermal energy of a bouncing basketball
Answer:
when the ball is bounced gravitationally energy is released (more info below)
Explanation:
When a force is applied down to the ball, the gravitational potential energy is converted into kinetic energy before it hits the earth. Cinetic energy is converted into vibration, thermal, and static electrical energy, before the momentum of the ball pushes the ball back up into the hands of the people.
hope this helped!
The description of the mechanical energy and the thermal energy at the time when the ball should be bounded at the time when there is the realization of the gravitational energy.
Force applied down to the ball:
At the time when the force is applied down to the ball so here the gravitational potential energy should be transformed into kinetic energy prior at the time when it should be hit to the earth. Kinetic energy should be transformed into vibration, thermal, and static electrical energy prior to the momentum of the ball that pushed the ball back up the hands of the people.
Learn more about energy here: https://brainly.com/question/24432180
Calculate the current through a 500W,230V heater. Which fuse would you use for this appliance?
Answer:
2.17 A
Explanation:
P=VI
I=P/V -----> 500/230=2.17 A