Answer:
A dot product of two vectors is also called the scalar product. ... The difference between the dot product and the cross product of two vectors is that the result of the dot product is a scalar quantity, whereas the result of the cross product is a vector quantity.
Explanation:
Hope it is helpful.....
Since coal forms from tropical swamp plants that were buried and compacted millions of years ago, how would you explain the presence of coal in Antarctica?
Answer:
hello and thank you
Explanation:
The existence of coal beds in Antarctica is evidence that the region once experienced significant warming and was home to vast amounts of plant life.
What is Continental Drift Theory?One of the earliest hypotheses put up by geologists for how continents might migrate through time is called continental drift. The science of plate tectonics has now supplanted the theory of continental drift.
The scientist Alfred Wegener is most closely connected with the concept of continental drift. Wegener wrote a paper outlining his notion that the continents were "drifting" across the Earth, occasionally crashing through oceans and into one another, in the early 20th century. He referred to it as continental drift.
What is known about Antarctica's changing climate is that it didn't begin to cool until roughly 34 million years ago, when the continent was severed from the others which supports Continental Drift theory.
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The SI unit for acceleration is_____
a m/s.
b m/s 2
c m/s2
d none of the above
an electric heater draws a current of 5 ampere from 220 volt supply.Calculate
(a) its resistance
(b) electrical energy consumed in kwh if it is used for 4 hours
[tex] \bf \underline{Given :-}[/tex]
[tex] \sf{• \: An \: electric \: heater \: draws \: a \: current \: of \: 5 \: ampere \: from \: 220 \: volt \: supply.}[/tex]
[tex] \\ [/tex]
[tex]\bf{ \underline{To \: Find:- }}[/tex]
[tex] \sf• \: ( a) \: lts \: resistance.[/tex]
[tex] \sf• \: (b) \: electrical \: energy \: consumed \: in \: kwh \: if \: it \: is \: used \: for \: 4 \: hours.[/tex]
[tex] \\ [/tex]
[tex]\huge\bf{ \underline{ Solution :-}}[/tex]
[tex] { \boxed{\bf{(a)}}}[/tex]
[tex] \sf• \: Current \: (I) = 5 \: A[/tex]
[tex] \sf• \: Voltage \: (V) = 220 \: v[/tex]
[tex] \bf \red{\bigstar{\: Formula \: of \: Resistance \: (R) = \frac{V}{I} }}[/tex]
[tex] \sf \rightarrow R = \frac{220}{5} [/tex]
[tex] \sf \rightarrow R =44[/tex]
[tex] \bf{Hence, \: it's \: resistance \: is \: \: 44 \: Ω \: .}[/tex]
[tex] \\ \\ [/tex]
[tex] { \boxed{\bf{(b)}}}[/tex]
[tex] \sf• \: Current \: (I) = 5 \: A[/tex]
[tex] \sf• \: Voltage \: (V) = 220 \: v[/tex]
[tex] \bf \red{\bigstar{\: Formula \: of \: Electric \: Power \: (P) = IV }}[/tex]
[tex] \sf \rightarrow P = (5 \times 220) [/tex]
[tex] \sf \rightarrow P = 1100 \:[/tex]
[tex] \\ [/tex]
[tex] \sf \therefore \: P = 1100 \: watt[/tex]
[tex] \sf{• \: Time \: (t) = 4 \: hours }[/tex]
[tex] \bf \red{\bigstar{ \: Formula \: of \: Energy \: (W) = Pt}}[/tex]
[tex] \sf \rightarrow W= 1100 \times 4[/tex]
[tex] \sf \rightarrow W = 4400[/tex]
[tex] \sf \rightarrow W = \frac{4400}{1000} [/tex]
[tex] \sf \rightarrow W = 4.4[/tex]
[tex] \sf \therefore W = 4.4 \: kwh[/tex]
[tex] \bf{Hence, \: Electrical \: Energy \: is \: 4.4 \: kwh.}[/tex]
Answer is 4.4 kwh.
hope it helps you.
‼️‼️EMERGENCY ITS DUE SOON‼️‼️
A box weighing 2000N is sliding across a cement floor. The force pushing the box is 500N, and the coefficient of sliding friction between the box and the floor is 0.20. What is the acceleration of the box? 
Answer:
I couldn't send you this over comments so you could keep your points but this is from an article I found that breaks it down. I hope it helps. I'm sorry I've never taken physics but wanted to help you.
Explanation:
Example 1
A box weighing 2000. N is sliding across a cement floor. The force pushing the box is 500. N, and the coefficient of sliding friction between the box and the floor is 0.20. What is the acceleration of the box?
In this case, the box is sliding along the ground, so the normal force for the box is equal to its weight. Using the normal force and the coefficient of friction, we can find the frictional force. We can also find the mass of the box from its weight since we know the acceleration due to gravity. Then we can find the net force and the acceleration.
FF=μFN=(0.20)(2000. N)=400. N
mass of box=weightg=2000. N9.8 m/s2=204 kg
FNET=pushing force−frictional force=500. N−400. N=100. N
a=FNm=100. N204 kg=0.49 m/s2
This question involves the concepts of frictional force, Newton's Second Law of Motion, and acceleration.
The acceleration of the box is "0.49 m/s²".
According to Newton's Second Law of Motion:
[tex]Net\ Force = ma\\F - f = ma[/tex]
where,
F = Pushing force = 500 N
f = frictional force = μN
μ = coefficient of friction = 0.2
N = Normal Force = Weight = 2000 N
m = mass of box = [tex]\frac{N}{g}=\frac{2000\ N}{9.81\ m/s^2}=203.9\ kg[/tex]
a = acceleration = ?
Therefore,
[tex]500\ N -\mu N=(203.9\ kg)a\\\\\frac{500\ N - (0.2)(2000\ N)}{203.69\ kg}=a\\\\[/tex]
a = 0.49 m/s²
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Green light travels by what type of wave? (2 points) a Conductive b Electronic c Conducive d Electromagnetic 2
Answer:
Electromagnetic
Explanation:
Electromagnetic waves are those waves that do not require any material medium for propagation. They arise from a vibration of electric and magnetic fields.
The electromagnetic spectrum is comprised of many waves. One of the waves in the spectrum is visible light.
Visible light is in turn composed of seven different wavelengths of which green light is one of them. Hence, green light travels by electromagetic wave.
NEED HELP ASAP
thanks + BRAINLIST only for correct answer
Answer:
b. They travel in straight line from their sourceIs correct option
Explanation:
Here, we see that,In option a:
The statement is not correct This is because, light waves does not always come from across the space such as sun and other stars, a small light bulb when given electricity then releases light and heat wave.In option b:
The statement is correctThis is because, if we see a light source such as light bulbs, tubelights, sunlight, etc. every light source always gives out their light energy in a straight path not in a different manner.In option c:
The statement is not correct This is because, light waves do not pass through every type of materials. Materials such as book, brick, wall, etc. which are opaque do not allow light to pass through it.In option d:
The statement is not correct This is because, every material do reflect light, it doesn't matter whether they have a smooth surface or a rough surface. As every materials reflect light for which we are able to see that material.Hence,By this we can conclude that only option b is correct.
Under constant acceleration, the average velocity of a particle is half the sum of its initial and final
velocities. Is this still true if the acceleration is not constant? Explain.
Answer:
It is not still true that the average velocity of the particle is equal to half the sum of the initial and final velocities when the acceleration of the particle is not constant
Explanation:
The motion of a particle under constant acceleration, 'a', is be given by the following kinematic equations;
v² = u² + 2·a·s
v = u + a·t
Where;
v = The final velocity of the particle
u = The initial velocity of the particle
a = The acceleration of the particle
s = The distance through which the particle travels
t = The time of motion of the particle
By simplifying the above equation, we have;
v² - u² = 2·a·s
(v² - u²)/(2·a) = s
(v - u) × (v + u)/(2 × a) = s
((v - u)/a) × ((v + u)/2) = s
From v = u + a·t, we have;
t = (v - u)/a
∴ ((v - u)/a) × ((v + u)/2) = t × ((v + u)/2) = s
∴ ((v + u)/2) = s/t
The average velocity = (Total distance traveled by the particle) ÷ (The time of travel of the particle)
∴ The average velocity = s/t = ((v + u)/2) = Half the sum of the initial and final velocity
However, it is not still true that the average velocity of the particle is equal to half the sum of the initial and final velocities when the acceleration of the particle, 'a', is not constant, as the velocity time graph is no longer a straight line graph and the distance traveled by the particle, 's', which is the area under the velocity time graph, 'A', (given by the sum of area of the triangle and the rectangle given by the area under straight line graph for constant velocity) cannot be given directly by the product of the time and the average velocity.
why is the time every 15° eastward one hour ahead?..
Explanation:
The reason time zones are 15 degrees wide is because there are 24 hours and 360/24 = 15. As you move east by 15 degrees the sun’s position in the sky changes relative to us and it looks an hour later in the day, so we advance our clocks to match the sun’s position.
So every 15° eastward one hour ahead.
A bottle of water with mass 0.9 kg is left out in the sun, the radiation from the sun warms up the water bottle. If the water bottle was initially 10°C and the sun provided 120,000 J of thermal energy, calculate the final temperature of the water. Use C = 4182 j/kgK for the specific heat of water.
Answer:
Final temperature, T2 = 314.9 Kelvin
Explanation:
Given the following data:
Mass = 0.9kg
Initial temperature, T1 = 10°C to Kelvin = 10 + 273 = 283K
Quantity of heat = 120,000 J
Specific heat capacity = 4182 j/kgK
To find the final temperature;
Heat capacity is given by the formula;
[tex] Q = mcdt[/tex]
Where;
Q represents the heat capacity or quantity of heat.
m represents the mass of an object.
c represents the specific heat capacity of water.
dt represents the change in temperature.
Making dt the subject of formula, we have;
[tex] dt = \frac {Q}{mc} [/tex]
Substituting into the equation, we have;
[tex] dt = \frac {120000}{0.9*4182} [/tex]
[tex] dt = \frac {120000}{3763.8} [/tex]
dt = 31.9K
Now, the final temperature T2 is;
But, dt = T2 - T1
T2 = dt + T1
T2 = 31.9 + 283
T2 = 314.9 Kelvin
A body is at equilibrium under the action of three forces. One force is 10N acting due east and one is 5N in the direction 60° north east. What is the magnitude and direction of the third force?
Answer:
If the body is in equilibrium the two forces add up and the third is the opposite of the resultant.
F(1x)=F(1)=10 N
F(2x)=F(2)cos60=5•0.5=2.5 N
F(2y) =F(2)sin60 = 5•0.866= 4.33 N
F(3x) =- F(x)=- (10+2.5 )= -12.5 N
F(3y) =- F(2y)= - 4.33 N
F(3) = sqrt{ F(3x)²+F(3y)²} =13.23 N
tan φ = F(3y)/F(3x) =4.33/12.5=0.364
φ = 19.1⁰ (south-west)
Explanation:
A car is driving at a speed of 50 m/s. After 6 seconds he notices a wreck up ahead and slows down to 20 m/s. What is his acceleration
Answer:
the acceleration of the car is -5 m/s².
Explanation:
Given;
initial velocity of the car, u = 50 m/s
time of motion, t = 6 s
final velocity of the car, v = 20 m/s
The acceleration of the car is calculated as;
[tex]a = \frac{v-u}{t} \\\\a = \frac{20-50}{6} \\\\a = - 5 \ m/s^2[/tex]
Therefore, the acceleration of the car is -5 m/s².
What are two DIFFERENT resources that can be found on the ocean floor?
How far can A car traveling A 25.0 km/hour travel in two hours
Answer:
50km
Explanation:
25*2.............
what is meant by the resultant force acting on an object?
Answer:
The resultant force is the single force that would produce the same effect on an object as two or more forces that are applied to the object. To find the resultant force, first draw a free body diagram, which is a diagram that shows all the applied forces using arrows in the direction of each force.
Two charges lie on the x-axis, one at the origin and the other at 14.3m What is the potential (relative to infinity) due to these charges at a point at 7.1m measured from the origin on the x-axis?
Answer:
V = 2.52 10³ V
Explanation:
The electric potential for a point charge is
V = k ∑ [tex]\frac{q_i}{r_i}[/tex]
In this case the formula is
V = k ([tex]\frac{q_1}{r_1} + \frac{q_2}{r_2}[/tex])
distances are the absolute value
r₁ =√ (7.1 -0)² = 7.1 m
r₁ =√ (7.1 - 14.3)² = 7.2 m
we substitute
V = 9 10⁹ (q₁ / 7.1 + q₂ / 7.2)
we have two possibilities
* different charges
V = 9 10⁹ (q₁ / 7.1 + q₂ / 7.2)
* equal charges and same sign
q₁ = q₂ = q
V = 9 10⁹ q (1 / 7.1 + 1 / 7.2) = p 9 10⁹ 0.2797
V = 2.52 10⁹ q
if we assume a value of the charge, for example q = 1 10⁻⁶ c
V = 2.52 10⁹ 1 10⁻⁶
V = 2.52 10³ V
Which of these is NOT used to create a simple electromagnet?
Battery
Light bulb
Copper wire
battery
Explanation:
Electromagnets can be created by wrapping a wire around an iron nail and running current through the wire. The electric field in the wire coil creates a magnetic field around the nail. In some cases, the nail will remain magnetised even when removed from within the wire coil
Answer:
Light Bulb
Explanation:
I did the quiz and i got it right
Which is the correct order of the academic pathway of a pulmonologist?
undergraduate school ® internship ® residency ® medical school ® fellowship training
undergraduate school ® medical school ® internship ® residency ® fellowship training
undergraduate school ® medical school ® residency ® fellowship training ® internship
undergraduate school ® residency ® medical school ® fellowship training ® internship
Answer:
B
Explanation:
on edge 2021
Answer:
B. undergraduate school ® medical school ® internship ® residency ® fellowship training
Explanation:
please solve this question
An ice cube is put into a heated pan. What will most likely happen to the molecules in the ice as the ice is heated
1. the molecules will begin to move slower
2.the molecules will begin to move faster
3. the molecules will begin to increase in density
4. the molecules will begin to condense in the air
Answer:
2 the molecules will move faster
Explanation:
the heat from the pay gives the molecules now energy causing the to spread out and move faster
what is relative density
Can someone help me name the layers.
Answer:
A. Crust
B. Mantle
C. Outer Core
D. Inner Core
Explanation:
Answer:
A. Crust
B. mantle
C. outer core
D. inner core
Explanation:
because it is
SOMEONE HELP ME PLEASE!!!!!
Answer:
I think it would be the 3rd or 4th one.
A gas is put into a closed container. The container and the gas inside it are heated. What will happen to the pressure inside the container?
Answer:
Explanation:
Plug
Suppose the gravitational force between two massive spheres is 100 N. If the distance between the spheres is divided by 3, what is the force between the masses?
Answer:
300N
Explanation:
Because the distance between the spheres has decreased, the gravitational pull will become stronger by the same decrease in the distance.
In this case:
100N × 3 = 300N
Someone help me please I need to pass this quiz , this is the only quiz that It making me fail this class !!!
Select the correct items. Click the bottom right arrow to go to the next set . Click the checkmark ( Available on the last set ) to submit all your answers
Slow twitch muscle Fibers
Can contract repeatedly
Only anaerobic sources
Both aerobic & anaerobic
Produce most force
Endurance activities
Fast contraction speed
Fatigue quickly
Only aerobic sources
Speed, strength, power
Fast twitch Type lla muscle Fibers
Only aerobic sources
Fast contraction speed
Speed, strength, power
Only anaerobic sources
Fatigue quickly
Endurance activities
Produce most force
Can contract repeatedly
Both aerobic & anaerobic
Fast twitch type llx muscle Fibers
Can contract repeatedly
Only anaerobic sources
Only aerobic sources
Both aerobic & anaerobic
Fast contraction speed
Produce most force
Fatigue quickly
Endurance activities
Speed, strength, power
Answer:
1. Endurance activities
Only aerobic source
2. Can contract repeatedly
Speed strength and power.
Both aerobic and anaerobic sources
3. Fast contraction speed
Only anaerobic sources
Produce most force
Fatigue quickly
Speed, strength and power
Explanation:
I hope this helps. Although, I'm about 80% sure of the answer.
CAN SOMEONE TELL ME THE answer for this ?
Answer:
b. light from earth is reflected by the moon surface
Answer:
C. Light from the sun is reflected by the moon's surface
Explanation:
In some parts the Light reaches, it gets lighted up and the parts where light does not reaches we can't see so we see the phrases of the moon .
As the train in the image moves to the right, which person hears the train horn at a lower pitch?
Explanation:
the persons in the train hears it at a lower pitch
Find what is the ratio of the internal energy of hydrogen UB. To the internal energy of helium UJ for two moles of hydrogen and four moles of helium taken at the same temperature
Answer:
Ration of internal energy of hydrogen to the internal energy of helium is equal to [tex]\frac{5}{6}[/tex]
Explanation:
As we know
degree of freedom of hydrogen is 5
Degree of freedom of helium is 3
Internal energy of hydrogen
[tex]\frac{5}{2} * 2 * RT = 5 *RT[/tex]
Internal energy of helium
[tex]\frac{3}{2} * 4 * RT = 6 *RT[/tex]
Ration of internal energy of hydrogen to the internal energy of helium is equal to [tex]\frac{5}{6}[/tex]
how can changing the kinetic energy of an object cause energy to be transferred to or from the object
Kinetic Energy. Energy is transferred from one object to another when a reaction takes place. Energy comes in many forms and can be transferred from one object to another as heat, light, or motion, to name a few. For the blue ball to move to the position of the green ball, energy must be given to the blue ball.
In everyday situations, it does seem that a force is needed to keep an object, for example the shopping trolley, moving at a constant speed in a straight line.
Explain why.
[tex]\huge{\textbf{\textsf{{\color{pink}{An}}{\red{sw}}{\orange{er}} {\color{yellow}{:}}}}}[/tex]
An object at rest stays at rest and an object in motion stays in motion at a constant speed and direction unless acted upon by an unbalanced force. ... In the absence of any forces, no force is required to keep an object moving.
Thankshope it helpsIn everyday situations, it does seem that a force is needed to keep an object moving at a constant speed in a straight line because the resistive frictional force acted on every objects against their motion.
What is friction?The resistance provided by surfaces in touch as they move past one another is known as friction.
According to Newton's first law of motion, Unless forced to change its condition by an outside force, every object will continue to be at rest or moving uniformly in a straight line.
But in everyday situations, it does seem that a force is needed to keep an object, for example the shopping trolley, moving at a constant speed in a straight line because of the frictional resistive force acting opposite to the motion. That's why, a force of equal magnitude and opposite direction must be applied on the object, so that, resultant force becomes zero. It can at a constant speed in a straight line.
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