Answer:
The most correct option here is B
Explanation:
Models are usually used in science in order to proffer or explain difficult concepts of the real/actual "subject". The model to be used must have some level of similarity (usually high) with the actual subject. The use of model helps to explain how certain things work in the actual subject. Actual subjects are sometimes eventually used later after convincing experiments (showing "positive" results) must have been done on the model.
From the explanation above, it can be deduced that the correct option is B
Explain why it is important that the balloon is made from an electrical insulator.
Explanation:
object made of rubber, such as the ballons are elecrical insulators, meaning that they resist electric charges flowing through them..
when the ballon has been rubbed enough times to gain a sufficient negative charge, it will be attracted to the wall
7. What force is required to accelerate a 100 kg car to 4 m/s27 F=ma
O A. 25N
B. 104N
C. 400N
Answer:
is the formula is F=MA so
F=100kg×4m/s=400n
so the answer is 400n
A 45 kg wagon is being pulled with a rope that makes an angle of 38 degrees with the horizontal. The applied force is 410 N and the coefficient of kinetic friction between the wagon and the ground is 0.18.
Answer:
7.35m/s²
Explanation:
From the question we are not told what to find but we can as well find the acceleration of the wagon.
According to newton second law of motion
[tex]\sum F_x = ma_x\\Fm - Ff = ma_x\\Fm - \mu R = ma_x\\Fm- \mu mg = ma_x\\[/tex]
Fm is the moving force = 410N
[tex]\mu[/tex] is the coefficient of friction = 0.18
m is the mass = 45kg
g is the acceleration dur to gravity = 9.8m/s²
a is the acceleration of the wagon
Substitute the given data into the equation ang get ax
[tex]Fm- \mu mg = ma_x\\410 - (0.18)(9.8)(45) = 45a_x\\410 - 79.38 = 45a_x\\330.62 = 45a_x\\a_x = 330.62/45\\a_x = 7.35m/s^2\\[/tex]
Hence the acceleration of the wagon is 7.35m/s²
please help me on the 1st bullet point for brainliest!
Answer:
thermal energy
Explanation:
The magnitude of the resultant of two vectors of magnitude 3 units and 4 units is 5 units. What is the angle between two vectors?
Explanation:
Using Cosine rule, we have 5² = 3² + 4² - 2(3)(4)(cosx).
=> cosx = 0, x = 90°.
Using the matrices below, determine if the product of AB is defined. If defined, state its dimensions.
a.
not defined
c.
defined, 4 x 2
b.
defined, 2 x 4
d.
defined 3 x 4
Please select the best answer from the choices provided
The answer is, D. defined 3 x 4
Explanation:
But the only problem is, product A is not 3 x 4.
Product A is 2 x 3, so to make this a clear answer: Product B is D. defined 3 x 4 and Product A is A. not defined or alternate answer 2 x 3
What statement about the milky way is true?
Answer:
D) it is one of many galaxies
Explanation:
the milky-way galaxy is just one of billions of galaxies, which span billions and billions of light-years across the universe!!!
Answer:
D it is one of many
Explanation:
help with this question.......
Answer:
its a liquid
Explanation:
liquid means water water means liqiud without them we cannot survive we need to be healthy we should bath we should drink more amount of water
Can a body moving in circular path have constant velocity? Explain.
Answer:
constant velocity means that both the speed and direction do not change . An object moving in a circular path with constant speed does not have a constant velocity because the direction of the velocity is constantly changing. This implies that an object moving at a constant speed in a circular path is accelerating
A scientist heats an unknown substance in a closed system. The graph shows the change in temperature over time.
Answer:
C
Explanation:
When a substance is changing state, the heat supplied does not result in a rise in temperature. This is why, the heat supplied during change of state is referred to as 'latent heat'.
Latent heat is a heat that causes a change of state without a corresponding rise in temperature. During this time, the intermolecular bonds in the substance are broken.
Change of state will occur as regions in which there is no change in temperature with time such as point D on the graph.
Answer:
C
Explanation:
for me at least it was
A man does 40,000 J of work in 20 seconds. How much power does he exert?
Explanation:
Since P=W/t
P= 40000/20
P= 2000 Watt(or)Joule per sec
A physicist drops astone off the top of cliff over looking a lake. She hears the splash 4 second after releasing the stone?
Answer:
Height of cliff(h) = 80 meter (Approx)
Explanation:
Given:
Time taken t = 4 sec
Gravitational acceleration = 10 m/s (Approx)
Find:
Height of cliff(h)
Computation:
h = ut + 1/2(g)(t)²
Height of cliff(h) = (0)(4) + 1/2(10)(4)²
Height of cliff(h) = 80 meter (Approx)
The initial temperature of 150 g of ethanol was 22 C. What will be the final temperature of the ethanol if 3240 J was needed to raise the temperature of the ethanol
Answer:
30.405°CExplanation:
Using the formula for heart capacity;
Q = mcΔt
m is the mass = 150g = 0.15kg
initial temperature = 22°C
Quantity of heat = 3240J = 3.24kJ
specific heat capacity of ethanol = 2.57 [kJ/kg K]
Substitute and get the final temperature
3.240 = 0.15(2.57)(T - 22)
3.240 = 0.3855(T-22)
3.240/0.3855 = T - 22
8.405 = T - 22
T = 22+8.405
T = 30.405°C
Hence the final temperature of the ethanol if 3240 J was needed to raise the temperature of the ethanol is 30.405°C
A 0.050 kg golf ball leaves the tee at a speed of 75.0 m/s. The club is in contact with the
ball for 0.020 s. What is the net force of the club on the ball?
The ball accelerates from rest to 75.0 m/s in a matter of 0.020 s, so the drive applies an (average) acceleration of
a = (75.0 m/s - 0) / (0.020 s) = 3750 m/s²
Assuming this acceleration was constant, then the net force F on the ball is
F = (0.050 kg) (3750 m/s²) = 187.5 N ≈ 190 N
A container of gas is held at a constant volume. Which will most likely happen to the temperature if the pressure of the gas increases?
The temperature will increase at the same rate as the pressure increases.
The temperature will decrease at the same rate as the pressure increases.
The temperature will increase at half the same rate as the increase in pressure.
The temperature will decrease at half the same rate as the increase in pressure.
Answer:
With more particles there will be more collisions and so a greater pressure. The number of particles is proportional to pressure, if the volume of the container and the temperature remain constant. ... This happens when the temperature is increased.
Explanation:
Assuming the gas to be an ideal gas, the temperature will increase at the same rate as the pressure increases.
Ideal gas:Let us assume that the gas in the container is an ideal gas. Then from the ideal gas equation, we get that:
PV = nRT
where P is the pressure of the gas
V is the volume
T is the temperature
n is the number of moles of the gas
R is the universal gas constant
Now, it is given that V is constant, R is already a constant, and n will also be constant, since the number of moles of gas in the container is not changing, so:
P = nRT/V
P = constant × T
P/T = constant
This means that the temperature will increase at the same rate as the pressure increases.
Learn more about ideal gas:
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The lunch lady pushes a 100 kg zombie with 300 N of force. How much is the zombie accelerated
F = m × a
300N = 100kg × a
a = 300 : 100
a = 3ms-²
A bit of explanation :F = Force (N)
m = mass (kg)
a = acceleration (ms-², m/s²)
An earthquake sends a seismic wave through the ground. What is the
medium? ANSWER QUICK!
Answer:
THE GROUND IS THE MEDIUM OF SEISMIC WAVES
PLEASE ANSWER ASAP
The thermal energy produced by an electric heater in three minutes is used to melt wax. The
solid wax is initially at its melting point of 60 0C.
The specific latent heat of the wax is 220 J / g. The heater supplies 7700 J of thermal energy to
the wax. Some of the wax melts.
How much wax melts?
Answer:
m = 35 g = 0.035 kg
Explanation:
The amount of heat required by a specific mass of wax to be melted at its melting point can be given by the following formula:
[tex]Q = mL[/tex]
where,
Q = Heat Supplied by the Heater = 7700 J
m = mass of wax melted = ?
L = Latent Heat of Fusion of Wax = 220 J/g
Therefore,
[tex]7700\ J = m(220\ J/g)\\m = \frac{7700\ J}{220\ J/g}\\\\[/tex]
m = 35 g = 0.035 kg
calculate the pressure in SI unit when a thrust of 75kg acts on an area of 0.5m²
Answer:
Pressure will be: 1470 Pa
Explanation:
Given
m = 75kgA = 0.5m²We know that
Pressure = Force / Area
Force = mg = (75kg) (9.81 m/s²) = 735 N
Thus,
Pressure = Force / Area
= 735 / 0.5
= 1470 Pa ∵N/m² = Pa
Thus,
Pressure will be: 1470 Pa
Give three examples of how a cell's shape makes possible the cell's function
WILL GIVE BRAINLIEST
two points A=(+16) and B=(-4) At electric potential respectively find:
a)which points is at higher potential?
b)what is the pontial difference b/w the two points?
c)the work done in moving acharge of 5C from A to B?
Answer:
a. Point A
b. 20 V
c. 100 J
Explanation:
a. Point A is at a higher potential because there is a positive sign in front of its magnitude. Since it is a positive integral value, and has a higher magnitude than point B which is at -4, point A is thus at a higher potential than point B.
b. The potential difference between the two points ΔV = A - B
= +16 V - (-4 V)
= +16 V + 4 V
= + 20 V
c. The work done, W in moving a charge Q across a potential difference ΔV is W = QΔV
So, since Q = 5 C and ΔV = + 20 V
W = QΔV
= 5 C × (+ 20 V)
= 100 J
Do this work if someone give correct answer I make her brainliest do this worksheet please
Answer:
a. Any one way then I can say that Aluminum sulfide has mass per mole of ≈150.2g while aluminum has mass per mole of 26.9g
b. Sulfur is an element but aluminum sulfide is a compound
c.Beryllium and chlorine
d. BeCl2
e.i. Metals form ions by losing electrons but nonmetals form ions by gaining electrons
ii.A metal can react with an acid to produce a salt a nonmetal doesnt
iii. A metal forms ionic compounds whilst nonmetals form covalent compounds
When riding on a bus, you can tell you are moving by
observing the motion of objects like other moving vehicles
outside the window.
True or False?
Answer:
True
Explanation:
Differentiate between
Length and Time
Answer:
Concept: Physical Constants
Length is a measure of distance Time is a measure of concept of space.The difference between Length and Time is: Length is a measure of distance while Time is a quantity or measure of period.
Meaning of Length and TimeLength can defined as a fundamental quantity that describe the total space occupied by an object from end to end or the distance of an object from end to end.
Time can be defined the duration of an occurrence in space. Time is so important as it helps us adequately know the period of an event or occurrence.
In conclusion, The difference between Length and Time is: Length is a measure of distance while Time is a quantity or measure of period.
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three collinear forces,F1=45N west,F2=63N east and an unknown force F3 are applied to an object.The resultant force of the three forces is 12N west.
Show by means of a tail to head method of vector addition how the magnitude of F3 could be found?
Take east to be the positive direction. Then the resultant force from adding F₁ and F₂ is
F₁ + F₂ = (-45 N) + 63 N = 18 N
which is positive, so it's directed east.
To this we add a third force F₃ such that the resultant is 12 N pointing west, making it negative, so that
18 N + F₃ = -12 N
F₃ = -30 N
So F₃ has a magnitude of 30 N and points west.
here's the cbse syllabus for magnetic effects of electric current
Explanation:
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What is the energy transformation of these street lights with solar panels?
A 3.0-kg mass is moved at a constant speed by a force of 6.0 N. What is the change in the kinetic energy of the mass as it moves over a distance of 4.0 m in the direction of the force
Answer:
The change in kinetic energy is zero (0).
Explanation:
Given;
mass of the object, m = 3.0 kg
applied force, f = 6 N
distance through the object is moved, d = 4.0 m
The acceleration of the object is calculated as;
f = ma
a = f / m
a = (6) / 3
a = 2 m/s²
The constant speed through which this object is moved is calculated as;
v² = u² + 2ad
v² = 0 + 2 (2)(4)
v² = 16
v = √16
v = 4 m/s
The change in kinetic energy is calculated as;
ΔK.E = K.E(final) - K.E(initial)
ΔK.E = ¹/₂mv₂² - ¹/₂mv₁²
v₂ = v₁ = v (since the mass was moved at a constant speed; v)
ΔK.E = ¹/₂mv² - ¹/₂mv²
ΔK.E = 0
Therefore, the change in kinetic energy is zero (0).
What is S.I units ?
The International System of Units is the modern form of the metric system. It is the only system of measurement with an official status in nearly every country in the world.
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