Answer:
A. 10Ω
Explanation:
the resistance of a heater with a current of 12 A and plugged to a voltage of 120 V is B. 10 Ω
Resistance: This can be defined as the opposition to the flow of current in an electric circuit.
In other to solve the problem above, make use of ohm's law
Ohm's can be represented mathematically as
V = IR................... Equation 1
Where V = Voltage, I = Current, R = Resistance
From the question,
make R the subject of the equation
R = V/I.............. Equation 2
Given: V = 120 V, I = 12 A
Substitute these values into equation 2
R = 120/12
R = 10 Ω
Hence the resistance of the heater is B. 10 Ω
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Light travels through water at 2.2506 x 108 m/s. A person shines a light at a friend that is underwater. If the ray in the water makes an angle of 38° with the normal, what is the angle of incidence?
please find your answer in the attached image, than you for 48 points.
The ray in the water makes an angle of 38° with the normal, so the angle of incidence is 55°.
What is Angle of Incidence?The angle of incidence is defined as the angle between a ray incident on a surface and the line which is perpendicular to the surface at the point of incidence called the normal. The beam can be created by any wave, such as optical, acoustic, microwave and X-ray.
Angle of incidence can be find out by Snell's Law. For the above given information,
Speed of light in water, v = [tex]2.2506 * 10^8 m/s[/tex]
Speed of light in vacuum, c= [tex]3* 10^8 m/s[/tex]
Refractive index (µ)= c/ v
So, Refractive index = [tex]3 * 10^8 / 2.2506* 10^8[/tex] = 1.33
Using Snell's Law,
µ of air * sin θ = µ of water * sin 38°
1 * sin θ = 1.33 * 0.61
sin θ = 0.811
θ = 55°
Thus, the ray in the water makes an angle of 38° with the normal, so the angle of incidence is 55°.
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PLS HELP ME ANSWER THESE 2 QUESTIONS lol
Answer:
a) Yes, this is kinda the best way to split the teams.
b) Force (or acceleration, these are proportional)
Explanation:
For both questions, we should start with the second Newton's law.
This law can be written as:
F = m*a
force equals mass times acceleration.
a) For the case of the rope, the ideal situation is having almost the same mass in both ends of the rope, in this way, the relation between force and acceleration in each end will be equivalent. (while one could argue that 3 smaller people will actually have a larger mass than the two bigger ones) but yes, this way is a good way to split the teams, so the mass is as even as possible.
b) Acceleration is defined as the rate of change of the velocity.
Again, by the above equation:
F = m*a
We need to have a force if we want to have acceleration.
Then, if an object has constant velocity (if the object is at a full stop, then it has a constant velocity of 0 m/s) we need to apply a force to this object if we want to change its motion.
Similarly, if an object is accelerating, we can apply a force to the object in order to cancel that acceleration (if the net force applied in the object is zero, then the acceleration is zero)
So here we can conclude that a force is what causes an object to change its motion.
What is the relation of pressure, force and area?
Answer:Answer: Pressure is directly proportional to force and inversely proportional to area. Explanation: As from above it is visible that pressure is directly proportional to the force applied which means that if force increases, pressure increases. It is also inversely proportional to the area of cross-section.
Explanation: welcome
Can some one help me with this question its hard :( down below ill give brainliest
State one similarity between rotatory and circular motion
Answer:
The main difference between these types of motion is that circular motion is a special case of rotational motion, where the distance between the body’s centre of mass and the axis of rotation remains fixed.
Rotational motion is based around the idea of rotation of a body about its center of mass. In rotational motion, the axis of rotation and centre of mass could change whereas in circular motion, the axis of rotation and centre of mass does not change.
Circular motion is a movement of an object along the circumference of a circle or rotation along a circular path and can either have a constant angular rotation rate and constant speed, or it can exist with a changing rate of rotation.
Think of one of those fairground rides where people sit on dummy horses. Now imagine the horses spin around the post that holds them to the base of the ride. Then you have both rotational motion of the horse and circular motion as the horses move around the ride.
2. Why is CO2 important?
What does this diagram represent?
A.) a turbine
B.) a motor
C.) a generator
D.) an electromagnet
The image shown in the question is a clear depiction of a generator.
What is a generator?A generator is an equipment that has to do with the production of electricity by the use of electromagnetic induction. The generator has split rings that make contact with the exterior.
The image shown in the question is a clear depiction of a generator.
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Answer:
Explanation:
C. Generator
How much work is done by 0.070 m3 of gas, when the volume remains constant with pressure of 63 x 105 Pa?
Answer:
W = 0 J
Explanation:
The amount of work done by gas at constant pressure is given by the following formula:
[tex]W = P\Delta V[/tex]
where,
W = Work done by the gas
P = Pressure of the gas
ΔV = Change in the volume of the gas
Since the volume of the gas is constant. Therefore, there is no change in the volume of the gas:
[tex]W = P(0\ m^3)\\[/tex]
W = 0 J
Which statement below BEST explains global warming?
B. an increase in the concentration of ozone
C. a decrease in the amount of deforestation
A. an increase in Earth's average surface temperature
D. an increase in the temperature of the oceans
The correct answer is A. an increase in Earth's average surface temperature.
While all of these are aspects of global warming, option A best summarizes it.
state the basic law of magnetism
Explanation:
A basic law of magnetism is that unlike poles attract each other. Two bar magnets can illustrate this. One is hung so that it swings freely. A pole of the second is brought, in turn, near each of the two ends of the hanging magnet.
What would changing the frequency of a wave do to the wave?
The Kentucky Derby is a 1¼ mile race. Mandaloun ran it in 1.52 minutes. Hot Rod Charlie ran at a speed of .79 miles per minute. Who won the race?
Answer:
Mandaloun won the race.
Explanation:
First, we will calculate the time taken by the Hot Rod Charlie:
[tex]s = vt\\t = \frac{s}{v}[/tex]
where,
t = time taken by Hot Rod Charlie = ?
s = distance covered = 1.25 miles
v = speed of Hot Rod Charlie = 0.79 miles/min
Therefore,
[tex]t = \frac{1.25\ miles}{0.79\ miles/min} \\t = 1.58 min[/tex]
Since Hot Rod Charlie took more time (1.58 min) than the Mandaloun (1.52 min).
Therefore Mandaloun won the race.
what fluid surrounds the brain and spine
Answer:
Cerebrospinal fluid (CSF) is a clear fluid that surrounds the brain and spinal cord.
If an object on earth has a mass of 50 kg, what is its weight in Newtons? Convert that weight to pounds.
Answer:
110.23113077052545
Explanation:
can someone help with the blank questions please?
A girl of mass 30.0 kg is on a roundabout of radius 5.0 m that makes one complete turn every 5.0 seconds.
What is the centripetal force acting on her?
Answer:
7
Explanation:
Looking at the two motion graphs, in which direction is the object moving faster?
A)
In the x-direction.
B)
In the y-direction.
The object is moving the same speed in each direction.
1
D)
The objec starts moving faster in the y-direction, but finishes moving
faster in the x-direction.
Ε
The answer is A) In the X-direction.
This is the case because, when you are asked about speed on a motion graph, the steeper the line gets, the faster it is going. In the first motion graph "Distance vs Time (X-direction)" the line is getting steeper, so that means it is going faster than the line depicted on the second graph.
(b) With a current of 0.38 A, the average velocity of an electron in the wire is 5.5 10-6 m s-1 and the average magnetic force on one electron is 1.4 10-25 N. Calculate the flux density B of the magnetic field.
Answer:
B = 0.159 T
Explanation:
Given that,
Current, I = 0.38 A
The average velocity of the electron, [tex]v=5.5\times 10^{-6}\ m/s[/tex]
The average magnetic force on the electron, [tex]F=1.4\times 10^{-25}\ N[/tex]
We need to find the flux density B of the magnetic field. We know that the magnetic force is given by :
[tex]F=qvB\\\\B=\dfrac{F}{qv}[/tex]
Put all the values,
[tex]B=\dfrac{1.4\times 10^{-25}}{1.6\times 10^{-19}\times 5.5\times 10^{-6}}\\\\B=0.159\ T[/tex]
So, the required flux density of the magnetic field is 0.159 T.
When was Brood X first identified and by who?
Answer:
.....................................................................
Answer:
.................................................................
Explanation:
Calculate the work done by a 4.2 N force pushing a 450. g sandwich across a table 0.8 m wide.
Answer:
3.36 Joules
Explanation:
Work done= Force × distance
F=4.2 N
distance= 0.8 m
work done= 4.2 × 0.8
work done= 3.36 Joules
whats wavelength? pls explain in 8th grade form pls
Answer:
Wavelength is the distance from one wave ray to the next. They can be from trough to trough or from crest to crest.
What is the difference in length between the longest ski trail and the shortest ski trail?
Answer:
Please provide more information!
Explanation:
Answer:
1.75
Explanation:
Any help would be great! Thank you x
Giving brainliest answer xoxo
Answer:
A vacuum would have been created. I hope this helps have a great day
A 10 kg sled is sliding down a hill at 5 m/s what is the Kinetic energy of the sled
Answer:
Explanation:
kinetic energy=1/2*mass*(velocity)^2
=1/2*10*(5)^2
=5*25
=125 joule
Model A: Two sponge balls representing two atoms are soaked in water. You hold one ball, and your friend holds the other. Then you press the two balls together. As you press them together, water leaks out. What type of reaction does this model represent?
:) thnx, please don't just answer for points
Answer:
The type of reaction represented by the model is an;
Exothermic reaction
Explanation:
Exothermic reaction reaction is a reaction that involves the giving off of excess energy as heat and or light by two or more reactants during a chemical reaction due to the higher combined energy of the reactants compared with the product
The analogy are;
The sponge balls are the reacting atoms
The water is the energy which they contain
The water given off is the excess energy which the compound formed by putting together the two soaked sponge balls is unable to hold.
How can light be both a wave and a particle? What does that mean?
Answer:
Explanation:
Quantum mechanics tells us that light can behave simultaneously as a particle or a wave. However, there has never been an experiment able to capture both natures of light at the same time; the closest we have come is seeing either wave or particle, but always at different times.When UV light hits a metal surface, it causes an emission of electrons. Albert Einstein explained this "photoelectric" effect by proposing that light – thought to only be a wave – is also a stream of particles
Why is light considered a wave and a particle?
Light behaves mainly like a wave but it can also be considered to consist of tiny packages of energy called photons. Photons carry a fixed amount of energy but have no mass. They also found that increasing the intensity of light increased the number of electrons ejected, but not their speed
A circuit has an overall resistance of 40 ohms and a current of 200mA.
What is the potential difference in this circuit?
Answer:
Hey!
_________________
Voltage (V) = 0.8V
Current (I) = 200 mA = 200/10^3 = 2/10
Resistance = ?
Resistance = Voltage / Current
Voltage = Current × Resistance
0.8 = 2/10 × Resistance
0.8×10/2 = Resistance
8/2 = Resistance
Resistance = 4 ohm
_________________
Hope it helps...!!!
Explanation:
Lesson : Electricity and Magnetism
Q. Answer the following questions on the basis of the given diagram.
i. Label A , C , D and H
ii. What is the value of I ?
iii. A freely suspended magnet inclines towards HF or AG. Why ?
~Irrelevant / Absurd answers will be reported !~
Answer:
Explanation:
The funny-looking circle is a hint but iii confirms we are talking about Eartth's magnetic field here :)
i. A is North Pole while H is the magnetic North Pole. D is the equator while C is the magnetic equator.
ii. I, the tilt angle, is about 11 degrees.
iii. A freely suspended magnet inclines towards HF or AG because it always points towards North/South.
Answer:
Explanation:
A is North Pole, D equator. H is the magnetic North Pole n C the magnetic equator.
I is 10-12 degrees
magnet points to N-S direction as in a compass
400 Kelvin to degrees Celsius
Answer:
400-273
127° C
I hope it's helps you
Answer:
126.85
Explanation:
hope it helps you!!
brainliest pls
Help!!!!
Which locations would be considered a target hazard?
mailbox unit on a highway
city baseball field
bus or train station
neighborhood playground
Answer:bus or train station is the answer of your question
hope it is helpful to you