Answer:
(a). [tex]\theta_2 = 12.5^o[/tex]
(b). [tex]\theta_1 = 19.0^o[/tex]
Explanation:
(a).
Snell's law says
[tex]n_1sin(\theta_1) = n_2sin(\theta_2)[/tex]
which in our case gives
[tex](1.00)sin(19.0^o) = (1.50)sin(\theta_2)[/tex]
Solving for [tex]\theta_2[/tex] gives
[tex]\dfrac{(1.00)sin(19.0^o)}{1.50} = sin(\theta_2)[/tex]
[tex]\theta_2 = sin^{-1}[\dfrac{(1.00)sin(19.0^o)}{1.50}][/tex]
[tex]\boxed{\theta_2 = 12.5^o}[/tex]
which is the angle of refraction from air to glass.
(b).
When the light ray goes from glass to back to air again, the angle of refraction equals the angle with which it had entered the glass because of the symmetry in Snell's law:
[tex](1.00)sin(\theta_1) = (1.50)sin(12.5^o)[/tex]
[tex]\boxed{\theta_1 = 19.0^o}[/tex]
The result is that the outgoing ray (one that refracted out from glass to air) and the tracing of the incoming ray (one that refracted into the glass) are parallel to each other.
A 60 W bulb is left on from 8:00 a.m. to 3:00 p.m. Calculate the energy usage of the bulb.
kWh
Answer:
.42
Explanation:
Answer:
0.42
Explanation:
A semi truck accelerates from rest to 36 m/s in just 12 seconds. What is its acceleration?
Answer:
3 m/sec(squared)
Explanation:
a=change in velocity/time
a=v-u/t
a=36-0=36/12
a=3m/s(squared)
The acceleration is 3 m/s².
To calculate the acceleration, the velocities given are:
Initial velocity u = 0 m/s,
Final velocity v = 36 m/s,
Time, t = 12 seconds.
What is acceleration and how it was calculated?Definition:
Acceleration can be defined as the total change in velocity, i.e., change in final velocity to the change in initial velocity to the total time taken.
Acceleration is a vector quantity as it has both magnitude and direction.
Formula for Acceleration, a = (( v - u) /t ) m/s².
[tex]\overline{a} = \frac{v - v_0}{t} = \frac{\Delta v}{\Delta t}[/tex]
v = Final velocity
u = Initial velocity
t = Time taken
Substitute all the given values in the formula,
a = ( 36 - 0) / 12
= 36 / 12
a = 3 m/s².
Thus, the truck's acceleration is calculated as 3 m/s².
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Which statements about light are true? Select all that apply. Select one or more: a. It can travel through empty space. b. It has no mass. c. It has moving electrons. d. It’s made of moving electric and magnetic fields.
Light can travel through empty space (a), has no mass (b) and is made up of moving electric and magnetic fields (d). It does not consist of moving electrons.
Explanation:In analyzing the statements about light, the following are true:
a. It can travel through empty space. This is evident in how sunlight reaches the Earth's atmosphere directly from the sun, traveling through the empty space in the universe. b. It has no mass. Light, whether as a particle or a wave, has no rest mass.d. It’s made of moving electric and magnetic fields. Physicist Maxwell speculated that light was a form of electromagnetic radiation, an electromagnetic disturbance moving at the speed of light. This conclusion has been confirmed in laboratory experiments.Statement c which says light has moving electrons is untrue. Instead, light is made up of particles called photons, which are massless and don't consist of electrons.
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The sprinter ran 110 m in 11 seconds. What was her average speed in m/s?
Answer:
10 m/s
Explanation:
110/11=10
Answer:
10 m/s
Explanation:
110/11= 10 m/s
Of the eight most abundant elements in earths crust, what percentage does the six next most abundant elements of earths crust make up?
Answer:
the sixth most abundant element in the earth's crust is sodium and it occupies 2.8%
Final answer:
The six next most abundant elements after oxygen and silicon make up 23.7% of the Earth's crust.
Explanation:
The student asked about the percentage of the Earth's crust made up by the six next most abundant elements after oxygen and silicon. Given that Oxygen and Silicon together make up 74.3% of the Earth's crust (46.6% oxygen and 27.7% silicon), we know that the eight most abundant elements constitute 98% of the Earth's crust. To find the combined percentage of the six following most abundant elements, we subtract the percentage of oxygen and silicon from 98%, which is 98% - 74.3% = 23.7%. Hence, aluminium, iron, calcium, sodium, potassium, and magnesium together make up 23.7% of the Earth's crust.
A series circuit has a current of 5 A. The circuit contains 10ohms resistor. What is the voltage of the circuit
Answer:
50 Volts
Explanation:
Using Ohm's Law
V= I x R
V= 5 x 10
V = 50 V
Which best describes the wavelength of a simple wave?
A.The distance from the crest of a wave to the crest of the
next wave
B.The distance from the crest of a wave to the trough of the
next wave
C.The number of waves that pass a certain point in a minute
D.The speed at which the wave travels in m/s
Answer:
I think it is A
Explanation: Wavelength is the distance from one crest to another, or from one trough to another, of a wave (which may be an electromagnetic wave, a sound wave, or any other wave). Crest is the highest point of the wave whereas the trough is the lowest.
This type of telescope uses a lens to collect
light.
Answer: optical telescope.
How does this person use energy to
ride the river's rapids?
Explanation:
Image? there is not image in there so I wouldn't be able to answer it properly...
Riding river rapids uses the kinetic energy of water to propel a kayak, while hydroelectric systems control and convert this energy into electricity.
How Energy is Used to Ride the River's Rapids:
When riding the river's rapids, a person uses kinetic energy inherent in the flowing water. The experience can be thrilling, as one navigates through the rushing white water in a kayak or other vessel. The power of a river's flow is a result of its ability to convert mechanical (potential) energy into thermal energy and hydroelectric power. In the case of rapids, the conversion of potential energy into kinetic energy creates the movement and force that propel the kayak downhill, offering the energy needed for the ride.
Similarly, hydroelectric systems like run-of-the-river projects harness the energy of a river in a more controlled manner. By directing water through a turbine—similar to how rapids propel a kayak—these systems convert the river's kinetic energy into mechanical energy, and subsequently into electricity with minimal energy lost as heat.
Why does the sun produce energy
Answer:
The sun generates energy from a process called nuclear fusion. During nuclear fusion, the high pressure and temperature in the sun's core cause nuclei to separate from their electrons. Hydrogen nuclei fuse to form one helium atom. During the fusion process, radiant energy is released.
A flagpole is a simple device on which a flag can be raised or lowered. Which simple machine is usually part of a flag pole?
A) lever
B) wedge
C) pulley
D) inclined plane
Answer:
C, a pulley! A pulley is made of a wheel and rope and in the case of the flagpole, it uses the pulley to raise the flag by pulling the rope.
What is the wavelength in nm of a light whose first order bright band forms a
diffraction angle of 30 degrees, and the diffraction grating has 700 lines per
mm? (give answer in whole number format) *
The wavelength of the first order bright band light light is 714 nm .
Explanation:
We have to find the wavelength of the first order brightness of a light. Here we are using Huygen's principle of light.
The formula is
nλ =d sinθ
where, n is the order of maximum
λ is the wavelength of light
d is the distance between the lines on diffraction grating.
θ is the angle.
For the given equation n is 1 because the problem states that the light forms 1st order bright band
λ is unknown.
d = [tex]\frac{1}{700,000}[/tex] or 0.0000014 m
sin (30) = 0.5
so,
1(λ) = (0.0000014)(0.5)
= 0.0000000714
= 714 nm
Thus, The wavelength of the first order bright band light light is 714 nm .
The diagra shows molecules in a fluid. Explain the
sequence of events that happens when this fluid cools down. Be sure to focus on what happens to the
molecules and to the fluid in general. Five events
should be included in your answer.
Answer:
Check below for the answers and explanations.
Explanation:
Note: You did not provide the diagram you mentioned but I will explain to you the sequence of events that take place as a fluid cools. I believe you can apply this to the particular diagram that you have.
Sequence of events that take place as a fluid cools down:
There is a reduction in the temperature of the fluidThe speed of movement of the molecules will reduceSince there is a reduction in speed, the Kinetic Energy also reduces. KE = 1/2 mv²The density of the fluid will increase as the temperature decreasesThe molecules will be closer to each other as opposed to in a gas where there is collision of moleculesThe sequence of events that occur when a fluid cools down are;
The temperature of the liquid will drop
When the temperature drops, the molecules will move more slowly.As a result of this decrease in velocity, the kinetic energy of the molecules will also decrease.As the temperature of the fluid decreases, the density of the liquid increases accordingly.The liquid molecules will draw closer together and intermolecular forces will become more significant.Liquid moleculesWe have to note that according to the kinetic theory of matter, the molecules of a liquid are in constant random motion. The kinetic energy of these molecules depend on the temperature of the liquid.
The five sequence of event that happens as liquid molecules cool down are;
The temperature of the liquid will dropWhen the temperature drops, the molecules will move more slowly.As a result of this decrease in velocity, the kinetic energy of the molecules will also decrease.As the temperature of the fluid decreases, the density of the liquid increases accordingly.The liquid molecules will draw closer together and intermolecular forces will become more significant.Learn more about liquid molecules: https://brainly.com/question/25667812
A 12-kg bowling ball is rolled toward a stationary, 0.9-kg bowling pin at 2.4m/s to the right. After the collision, the bowling ball continues to move in the same direction at 1.3m/s.
Determine the final velocity of the bowling pin.
Answer:
14.6m/s
Explanation:
elastic collision formula
mv1+mv2=mv1'+mv2'
mv1= mass times velocity of the first object
mv2= mass times velocity of the second object
mv1'=mass times velocity of the first object after the collision
mv2= mass times velocity of the second object after the collision.
we know that the pin is not moving so we multiply 0 or its velocity by the mass 0.9kg this equals zero so we don't add this part to the equation.
mv1=mv1'+mv2'
plugin the values and solve using order of operations
12kg(2.4m/s)=12kg(1.3m/s)+0.9kg(v2')
28.8kg.m/s=15.6kg.m/s+0.9kg(v2')
at this point you need to move 15.6kg.m/s to the other side of the equation so subtract 15.6kg.m/s to 28.8kg.m/s
28.8kg.m/s=15.6kg.m/s+0.9kg(v2')
28.8kg.m/s - 15.6kg.m/s= 0.9kg(v2')
finally Divide by 0.9kg in order to leave v2' in one side.
13.2kg.m/s=0.9kg(v2')
13.2kg.m/s÷0.9kg=v2'
14.6kg.m/s=v2'
Everything that you can see and touch is made of _______. The only things that are ___________ are ____________________ such as _________ and ____________.
The first blank is matter I'm not sure about the rest
Answer:
Matter
invisible
Things
nothing
nothing
Explanation:
I sounds like it goes there. :D
Which property of the wave does the value of two per second describe?
Answer: Frequency
Explanation:
The value of two per second is a measure of the frequency of a wave. It indicates that the wave completes two cycles in one second.
What is the frequency and time period?In physics, frequency and period are two related concepts that are used to describe the properties of waves. Period, on the other hand, is a measure of the time it takes for one complete cycle of a wave.
Here,
Frequency is a fundamental property of waves, and it determines the pitch of sound waves and the color of light waves. Waves with a high frequency have a high pitch or a high color temperature, while waves with a low frequency have a low pitch or a low color temperature.
In general, the higher the frequency of a wave, the more energy it carries and the shorter its wavelength. The relationship between frequency and other properties of waves, such as wavelength and speed, is described by various wave equations and laws in physics.
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Describe an example where you want to solve for a balanced Fnet= 0N
An unopened door pushed by two people with same force is the example for balanced Fnet=0N
Explanation:
There are two types of forces that acts on an object.
Balanced force and unbalanced force
In balanced force the net force becomes zero as the name itself indicates that the forces acting on the object gets balanced and cancels out each other.
Example:- Consider a door, and if two people with equal forces are trying to push the door. Then the net force becomes zero as the door remains not opened.
In unbalanced force the net force will not be zero as the forces acting on them are not equal.
Example: Soccer game ball pushed by the player is the best example.
The net force describes the sum or all the forces acting in the different directions on an object. When the net force is 0, then the force is balanced, otherwise, it is unbalanced.
A scenario where we have a balanced force would be a situation whereby a box at rest is being pushed in opposite direction.
When the force which tends to propel the box forward is equal to the force which tends to push the ball backward. Then the ball would not move and remain in the same position.
Hence, the net force acting on the box is balanced.
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If you double the amount of mass in a shopping cart by adding food to it, what do you have to do to the force to maintain the same acceleration as you had before? NEED HELP PLZZZZZZ
Answer:
Reduce the force
Explanation:
By newtons third law
F=m×a
or
Force =Mass ×Acceleration
In other words
Acceleration=Force/Mass
If the mass drops, to maintain the same acceleration, you need to reduce the force too
Mark needs to lower the pitch of the guitar to play his songs. How can Mark lower the pitch of the guitar?
A
Mark can make the strings tighter so they vibrate faster.
B
Mark can make the strings looser so they vibrate faster.
C
Mark can make the strings tighter so they vibrate slower.
D
Mark can make the strings looser so they vibrate slower.
12. A substance through which a wave can travel is a?
Answer - A substance through which a wave can travel is a medium
Explanation:
A medium is the middle point between the crest and trough and it helps to Carry the wave or you can call it the disturbance of the wave . .
A substance through which a wave can travel is called a medium.
A medium acts as a conduit for the transfer of energy from one point to another by allowing the wave to propagate. Waves require a physical medium to transmit their energy because they rely on the interaction and displacement of particles within the medium.
When a wave passes through a medium, it causes the particles of the medium to vibrate or oscillate in a specific pattern. These vibrations transfer energy from one particle to the next, enabling the wave to travel. The type of medium determines the properties of the wave, such as its speed, direction, and behavior.
Electromagnetic waves, such as light and radio waves, can propagate through a vacuum because they consist of oscillating electric and magnetic fields rather than relying on particles for transmission. These waves can travel through space, allowing us to observe distant stars and communicate wirelessly.
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please help me asap!!!!!!!
Answer:
you should have given the passage too bt i think option b is correct..
How do you find the volume of a cone with a height of 27 cm and a radius of 13 cm?
Answer:
1521π cm³
Explanation:
V = π·r²·h/3
= π·13²·27/3
= π·169·9
= 1521π cm³
The nervous system is one system among several in the human body. In order to function, does the nervous
system depend on other systems such as the circulatory system or the digestive system? Conversely, do these
systems depend on the nervous system? Explain your reasoning for each answer.
Answer:
The nervous system does depend on other systems visa versa.
Explanation:
They depend on each other because the brain needs nutrients given from the system and also the systems need the sensors from the nervous system.
A 1.31 kg flower pot falls from a window. What is the momentum of the pot when it
has fallen far enough to have a velocity of 2.86m/s?
00.458 kgm/s
06.35 kgm/s
O 3.75 kgm/s
02.18 kgm/s
the answer is 3.75 kgm/s
Momentum= mass x distance
1.31 x 2.86= 0.375kgm/s
Read the sentence form the section "Heavy Weights Can Be Trouble for Teens." Other schools that use the program are leery of the weight lifting. Which of the following words, if it replaced the word "leery" would CHANGE the meaning of the sentence? *
1 point
a. wary
b. cautious
c. unaware
d. skeptical
Explain why no work has been done after Ethan pushes against a brick wall for 5 minutes that did not move.
A. The wall does not contain inertia.
B. Three or more people are needed in order for work to be done.
C. Two or more people are needed in order for work to be done.
D. In order for work to be done, the wall needs to move.
Answer:
D
Explanation:
I believe the answer is D, but I am not an expert.
Final answer:
No work has been done when Ethan pushes against a stationary wall because, in physics, work requires displacement (transfer of energy), which does not occur here. Therefore option D. In order for work to be done, the wall needs to move is the correct answer.
Explanation:
When Ethan pushes against a brick wall for 5 minutes and the wall does not move, no work has been done despite the feeling of effort. This is because, in physics, the concept of work requires that there be displacement of the object in the direction of the applied force. Since no displacement occurs in this scenario, there is no transfer of energy to the wall, and therefore, no work is performed according to the formula W = Fd (where W is work, F is the force applied, and d is the displacement). The correct answer to why no work has been done is D. In order for work to be done, the wall needs to move. It is crucial to note that this technical definition of work may differ from the everyday usage of the term, which often includes any exertion of effort.
The green bars are called "error bars." They indicate the range of uncertainty that scientists have about the data on the graph. (Note: Not all error bars are shown.)
Why do you think these error bars are smaller near the year 2000 than in the 1890s?
This graph shows data up to about 2010. So it couldn't have been drawn before 2010. OF COURSE the data from only 10 years earlier was more reliable than the data that was 120 years old ! It wasn't even measured the same way back then as it is now.
Error bars are used to show the error in a reported measurement. The reason why the error bars are smaller near the year 2000 than in the 1890s because the ways of measuring have changed majorly over the past 100 years. The ways of measuring 100 years ago were probably not as accurate as the ways of measuring today.
Best of Luck!
A flask that weighs 345.8 g is filled with 225 mL of carbon tetrachloride. The weight of the flask and carbon tetrachloride is found to be 703.55 g. From this information, calculate the density of carbon tetrachloride.
Answer:
Well, I think the best answer will be is 1.59 g/mL Good Luck!
The density of carbon tetrachloride in the flask is calculated by subtracting the weight of the empty flask from the total weight to get the weight of the carbon tetrachloride. Then, use the formula density = mass/volume, which results to 1.589 g/mL.
Explanation:To calculate the density of carbon tetrachloride in the flask, first determine the weight of the carbon tetrachloride by subtracting the weight of the empty flask from the total weight. So, 703.55 g (the total weight) - 345.8 g (the weight of the flask) = 357.75 g (weight of carbon tetrachloride).
Next, we use the formula for density which is: density = mass/volume. Our mass (weight of carbon tetrachloride) is 357.75 g and our volume is 225 ml. Therefore, the density of carbon tetrachloride is 357.75 g / 225 ml = 1.589 g/mL.
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PLEASE HELP!!! WILL MARK BRAINLIEST!! Which example is not an electromagnetic wave?
ultraviolet light
infrared light
ultra high frequency sound
visible light
ultra high frequency sound
Explanation:
Ultraviolet light, infrared light, and visible light are all examples of electromagnetic waves.
Ultra high frequency sound, on the other hand, is a type of mechanical wave. Sound waves are mechanical waves that require a medium (such as air, water, or solid) to propagate, while electromagnetic waves do not require a medium and can travel through a vacuum (like in space). Ultra high frequency sound is not classified as an electromagnetic wave
A force of 120.0 N is applied to a 3.00 kg block. What is the average acceleration of the block?
Explanation:
F = ma
120.0 N = (3.00 kg) a
a = 40.0 m/s²