why does the ball repel as it touches the rod
Answer:
when a charged rod is brought close to the pith balls, their charges polarize. if they find in contact with the charged rod, they can inherit the same sign charge. since like charges repel. when similarly charged, the pith balls behave like siblings and refuse to touch each other.
THANK YOU
Describe a scenario when you could use energy but not do any work.
Answer:
When you don't move, you still use energy. This energy is called potential energy, or, stored energy.
When you don't move or do work, you can use energy.
when I am pushing a box of mass 70kg, but it is not changing its position means there is no work done by the box but i am applieng energy by pushing, i happened because the energy is not enough to overcome the friction. This is an example where there in energy is lost but there is no work done.
What is energy ?Energy is nothing but the ability to do work. there are different energies in different form which are thermal energy, mechanical energy, electric energy and sound energy etc. According to first law of thermodynamic, Energy neither be created nor be destroyed. it can only be transferred from one form into another form.
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An object with a mass of 20 kg has a net force of 80 N acting on it. What is the acceleration of the object?
Answer:
the answer is 4m/ s²
hope this helps love!! <3
One particular lightbulb has a 0.22-meter length of the tungsten wire used as its filament. This tungsten wire filament has a resistance of 19 ohms at a temperature of 20°C. The tungsten wire filament has a resistance of 240 ohms when this bulb is operated at a potential difference of 120 volts.
Explain why the resistance of the tungsten wire filament increases when the bulb is being operated compared to the resistance of the filament at 20°C.*
Explanation:
An increase in temperature occurs when the bulb is being operated. As resistance is directly proportional to temperature which means that an increase n temperature leads to an increase in resistance of a conductor.
Therefore, resistance of the tungsten wire filament increases when the bulb is being operated compared to the resistance of the filament at 20°C.
Balance the following equations:
1) AI + MnO2
2) Ga + H2SO4
3) Mg + HCI
→ Mn + Al2O3
→ Gaz(SO )3 + H2
→ MgCl2 + H2
Answer:
[tex]1) \: \: \: 4Al+ 3MnO _{2}→ 3Mn + 2Al _{2} O _{3} \\ 2) \: \: \:2Ga + 3H _{2}SO _{4} → Ga _{2} (SO _{4}) _{3} +3 H _{2} \\ 3) \: \: \: Mg + 2HCI→ MgCl _{2}+ H _{2}[/tex]
Which of the following is a correct
measurement of density?
Exam
A. 2.95 centimeters/cubic gram
B. 2.95 grams/pound
C. 2.95 grams/cubic centimeter
D. 2.95 cubic grams/centimeter
Answer:
C. 2.95 grams/cubic centimeter
Explanation:
Density can be defined as mass all over the volume of an object.
Simply stated, density is mass per unit volume of an object.
Mathematically, density is given by the equation;
[tex]Density = \frac{mass}{volume}[/tex]
The standard unit for the measurement of density of a substance is either kilograms per cubic meters or grams per cubic centimeters.
Hence, 2.95 grams/cubic centimeter is a correct measurement of density
¿cuantos colores existen?
Answer:
Los 11 colores básicos (negro, azul, marrón, gris, verde, naranja, rosa, púrpura, rojo, blanco y amarillo) y los 28 adicionales (turquesa, verde oliva, verde menta, borgoña, lavanda, magenta, salmón, cian, beige, rosado, verde oscuro, verde oliva, lila, amarillo pálido, fucsia, mostaza, ocre, trullo, malva, púrpura
hope that helps bby<3
Answer:
10 millones
Explanation:
En primer lugar, los científicos han determinado que en el laboratorio podemos ver unos 1.000 niveles de luz oscura y unos 100 niveles de rojo-verde y amarillo-azul. Eso es alrededor de 10 millones de colores ahí mismo.
Please help with the page below
Explanation:
I think a) Waste product and b) 80%
A sled drops 20 mts in height on a hill. The rider is going 20 m/s at the bottom of the hill. Where can you find kinetic and potential energy? In which moments?
Explanation:
Potential energy is the energy occupied by an object or substance due to its position.
For example, a sled drops 20 meters in height on a hill shows that a decrease in height is taking place.
Hence, potential energy is involved there.
Kinetic energy is the energy acquired by an object due to its motion.
For example, a rider is going 20 m/s at the bottom of the hill shows that rider is in motion due to which it has kinetic energy.
Mike roller skates with a constant speed of 10 miles per hour. How long will he take to travel a distance of 15 miles.
Answer:
So every hour he makes 10 miles. So he would take 1 and a half hours to go to Mcdonalds 15 miles away.
Explanation:
[tex]\huge\boxed{{\textsf{90 minutes}}}[/tex]
We know that Mike's speed is [tex]\dfrac{10\ \text{miles}}{60\ \text{minutes}}[/tex] since there are [tex]60[/tex] minutes in an hour, and we know that MIke needs to travel [tex]15[/tex] miles. We'll model this using fractions:
[tex]\dfrac{10\ \text{miles}}{60\ \text{minutes}}=\dfrac{15\ \text{miles}}{x\ \text{minutes}}[/tex]
We can see that there is a [tex]2:3[/tex] ratio here, so we'll divide the left fraction by [tex]2[/tex] and multiply it by [tex]3[/tex] to get the right fraction.
[tex]\dfrac{10}{60}\Rightarrow\dfrac{5}{30}\Rightarrow\dfrac{15\ \text{miles}}{\boxed{90\ \text{minutes}}}[/tex]
What are the positives and negatives of friction?
Answer:
Positives (advantages) of Friction:
Friction is responsible for many types of motion -
It helps us walk on the groundBrakes in a car make use of friction to stop the carAsteroids are burnt in the atmosphere before reaching Earth due to friction.It helps in the generation of heat when we rub our hands.Negatives (disadvantages) of Friction:
Friction produces unnecessary heat leading to the wastage of energy.The force of friction acts in the opposite direction of motion, so friction slows down the motion of moving objects.Forest fires are caused due to the friction between tree branches.A lot of money goes into preventing friction and the usual wear and tear caused by it by using techniques like greasing and oiling.An atom with 9 protons, 11 electrons, and 10 neutrons has a net charge of
A cyclist traveling at 30.0m/s along a straight road comes uniformly to stop in 5.00s. Determine the stopping acceleration, the stopping distance.
Answer:
I. Stopping acceleration = 6 m/s²
II. Stopping distance, S = 75 meters
Explanation:
Given the following data;
Final velocity = 30 m/s
Time = 5 seconds
To find the stopping acceleration;
Mathematically, acceleration is given by the equation;
[tex]Acceleration (a) = \frac{final \; velocity - initial \; velocity}{time}[/tex]
Substituting into the equation;
[tex]a = \frac{30 - 0}{5}[/tex]
[tex]a = \frac{30}{5}[/tex]
Acceleration = 6 m/s²
II. To find the stopping distance, we would use the third equation of motion;
[tex] V^{2} = U^{2} + 2aS [/tex]
Where;
V represents the final velocity measured in meter per seconds.
U represents the initial velocity measured in meter per seconds.
a represents acceleration measured in meters per seconds square.
Substituting into the equation, we have;
30² = 0² + 2*6*S
900 = 12S
S = 900/12
S = 75 meters
5
Which equation represents a line with a slope of
2
and a y-intercept of
- ?
3
Coordinates of y-intercept : (0,3)
Slope = 2
Another coordinate = 2 steps of rise and 1 step of run = (1,5)
Verification
Slope = (3-5) / (0-1) = -2 / -1 = 2
A) Which of the balloons shown below is under greater pressure? Give reason for your choice.
B) When John placed an inflated balloon inside freezer, what do you think would happen to the balloon? Explain a possible reason why this might happened.
Explanation:
I think number has the greater pressure because the molecules are seen tightly packed
Answer:
I think part A) is b because there's more matter(molecules) inside the second so it has more tension
and to part b) I think it would deflated because the air molecules decrease when the temperature does I think.
ASAP
A light wave travels through glass (n=1.50) at an angle of 35°. What angle
does it have when it passes from the glass into the air (n = 1.0)?
A. 59.4
B. 0.860
C. 22.5
D. 0.382
Answer:
A. 59.4
Explanation:
The refractive index of the glass, n₁ = 1.50
The angle of incidence of the light, θ₁ = 35°
The refractive index of air, n₂ = 1.0
Snell's law states that n₁·sin(θ₁) = n₂·sin(θ₂)
Where;
θ₂ = The angle of refraction of the light, which is the angle the light will have when it passes from the glass into the air
Therefore;
θ₂ = arcsin(n₁·sin(θ₁)/n₂)
Plugging in the values of n₁, n₂ and θ₁ gives;
θ₂ = arcsin(1.50 × sin(35°)/1.0) ≈ 59.357551° ≈ 59.4°
The angle the light will have when it passes from the glass into the air, θ₂ ≈ 59.4°.
Answer:
A. 59.4
Explanation:
got it right, trust
Two forces that make up 3rd law of motion can: 1)Act on the same object 2)do not act on same time 3)Act on different objects 4)Do not act oppositely
Answer:
3) Act on different objects
Explanation:
Newton's third law of motion states that for every action there is an equal and opposite reaction.
Action-reaction force pairs make it possible for fishes to swim, birds to fly, cars to move, etc.
Basically, action-reaction force pairs are characterized by the following statements;
I. The forces are the same type such as magnetic force, contact force or gravitational force.
II. The forces are equal in magnitude but opposite in direction.
III. They act up on two different bodies.
Hence, the two forces that make up 3rd law of motion can act on different objects.
For example, while driving down the road, a bug strikes the windshield of a vehicle (Action) and makes a quite obvious mess in front of the face of the driver of the vehicle (Reaction) i.e the bug hit the vehicle and the vehicle hits the bug.
If a wire with current 5.0A has 12 coulombs of charge pass through it how much has passed
Answer:
2.4 secs.
Explanation:
Current (A) = Charge (coulomb)/Time(sec)
We are looking for time. So:
Time (sec) = Charge (coulomb)/Current (A)
↓
12coulombs/5.0A = 2.4 secs
An observer standing near a window 5 m high observe that an object falling downwards is passing across the window in 0.5 s. Find at what height above the window the object was dropped. (g = 10 m/s2).
Answer:
Explanation:
An object in free fall, NOT experiencing parabolic motion, has an equation of
[tex]h(t)=\frac{1}{2} gt^2+h_0[/tex] which says:
The height of an object with respect to time in seconds is equal to the pull of gravity times time-squared plus the height from which it was dropped. Normally we use -9.8 for gravity but you said to use 10, so be it.
For us, h(t) is 5 because we are looking for the height of the window when the object is 5 m off the ground at .5 seconds;
g = 10 m/s/s, and
t = .5sec
[tex]5=\frac{1}{2}(-10)(.5)^2[/tex]+h and
5 = -5(.5)² + h and
5 = -5(.25) + h and
5 = -1.25 + h so
h = 6.25
That's how high the window is above the ground.
Height above the window object was dropped is 6.25 m
Given:
Height of window = 5 m
Time taken to drop object = 0.5 sec
Gravitational acceleration = 10 m/s²
Find:
Height above the window object was dropped
Computation:
We know that;
[tex]H(T) = \frac{1}{2}(g)(t^2) + H(S)\\\\5 = \frac{1}{2}(10)(0.5^2) +H(S)\\\\5 = (5)(0.5^2)+H(S)\\\\H(S) = 6.25[/tex]
So,
Height above the window object was dropped = 6.25 m
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How does a valve cause a pressure drop in terms of the individual molecules in the liquid?
Which of the following types of stars is cooler that an orange main sequence?
Answer:
Not sure but, I think C
Hopefully this helps
You lift a 44 N box from the floor and place it on a shelf that is 1.5 m above the ground . How much work did you use in lifting the box ?
Answer:
W = 66 J
Explanation:
Given that,
The weight of the box, W = 44 N
It is placed on a shelf that is 1.5 m above the ground.
We need to find the work done in lifting the box.
We know that,
Work done, W = Fd
So,
W = 44 N × 1.5 m
= 66 J
So, the required work done is equal to 66 J.
The sun is located in
the Crab Nebula.
the Andromeda Nebula.
the Milky Way Galaxy.
the Snickers Galaxy.
Answer:
The sun is located in the Milky Way Galaxy.
Which nucleus completes the following equation?
A. Br
B. Kr
C. Se
D. Po
Answer:
A completes the following equation
Magali exerts a force of 4.5 N to slide her Blackberry across the table (so she can hide it from Hina!). If she does 2.7 J of work in the process, how far has the Blackberry moved?
Work is equal to the magnitude of the force multiplied by the displacement x. Assuming Magali is pushing the phone, so that the force and displacement point in the same direction, then the work done is positive, and
2.7 J = (4.5 N) x ==> x = (2.7 J) / (4.5 N) = 0.60 m
Even if she was pulling the phone instead, the displacement would be the same, but the work done would be negative and the force would point in the opposite direction, thus also having a negative sign:
-2.7 J = (-4.5 N) x ==> x = 0.60 m
What is the equivalent resistance of the circuit?
60.0Ω
120.0V
20.0Ω
Α. 200.0Ω
Β. 20.0Ω
C. 40.0Ω
D. 80.0Ω
Answer:
80 Ω.
Explanation:
In this circuit the resistances are in series.The equivalent resistance of a series circuit is equal to the sum of the resistances. Req= 60 + 20 = 80 Ω.
The equivalent resistance of the circuit is 80 Ω. Hence, option (D) is correct.
What is resistance?Resistance is characterized as a conductor's quality that opposes the flow of electric current. The ratio of the applied voltage to the electric current passing through it is another definition for it.
A series combination of resistors is one in which two or more are linked end to end consecutively. Any number of resistances connected in series will result in a total resistance equal to the sum of the individual resistances.
In this diagram, two resistors of resistance 60 Ω and 20 Ω are connected in series combination.
So, the equivalent resistance of the circuit is = 60 Ω + 20 Ω = 80 Ω.
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Repetitive motion can cause injury.
Please select the best answer from the choices provided.
T
F
I believe it's true.
what will happen to satellite if the linear speed is reduced?. give a reason for your answer
Explanation:
If the satellite is moving too quickly then the gravitational attraction between the Earth and the satellite is too weak to keep it in orbit. If this is the case, the satellite will move off into space. This occurs at speeds around or above 11,200 metres per second (m/s).
in which point the electric intensity of a sphere is maximum
write down the relation between energy and power
Answer:
Energy is what makes change happen and can be transferred form one object to another. Energy can also be transformed from one form to another. Power is the rate at which energy is transferred. It is not energy but is often confused with energy.
Explanation:
Answer:
when u have energy u will have power n u can work as power is the capacity to do the work
