Given :
The light rays in the incident ray originate at 20º from the surface.
To Find :
The angle for the incident ray.
Solution :
We know angle of incidence is measured from perpendicular to the surface .
So,
[tex]\theta_i = 90^o - 20^o\\\\\theta_i = 70^o[/tex]
Now, we know by law of reflection :
Angle of reflection = Angle of incident
[tex]\theta_r = 70^o[/tex]
Therefore, the angle of incident and reflection is 70° each.
Mr Mann cut a cucumber. Mr Mann said, you have performed a chemical change. Is he right?
Answer:
No.
Explanation:
The cut cucumber is still a cucumber.
Answer:
Nope.
Explanation:
Chemical change is transforming the cucumber into a pickle. However, you need vinegar, so it isn't a full change.
Therefore, Mr. Mann would not be right either way, because all he did was cut a cucumber, and he should probably get some help with all this "chemical change".
please answer all of these questions for brainly!
Which use of iron is due to its chemical properties?
How do humans depend on geochemical cycles?
A. to provide clean water, breathable air, and soil that is capable of supporting crops.
B. to provide food and oxygen so organisms can survive
C. to help conserve resources for future use
Answer:
A
Explanation:
Because we need clean water to obtain a healthy diet, need oxygen which plants provide through photosynthesis and soil is important for food.
A stun gun or TASER is designed to put out a few seconds worth of electric pulses that impress a
voltage of about 1200 V across the human body. This results in an average current of approximately 3
mA into a human body. Using these figures, estimate the resistance of the human body.
Answer:
Resistance = 400000 Ohms
Explanation:
Given the following data;
Voltage = 1200 V
Current = 3 mA = 3/1000 = 0.003 A
To find the resistance;
Voltage = current * resistance
Resistance = 1200/0.003
Resistance = 400000 Ohms
Which type of electromagnetic radiation is used in cancer treatment?
A. X-rays
B. Visible light
C. Gamma rays
D. Infrared radiation
Answer:
C. Gamma Rays
Explanation:
A P E X
Answer:
C. Gamma rays
Explanation:
got it right
what is the energy of an electromagnetic wave that has a frequency of 5.0 x 10⁵ Hz?
Answer: 3.3 x 10^-28 J
Explanation: just answered on a quiz!! :)
The flooding of the Mississippi River
A) is always going to produce negative effects
B) deposits fertile soil in the Mississippi Delta.
C) deposits fertile soil in the western part of the state.
D) is responsible for the formation of the Mississippi Delta.
Hint: Rivers are agents of erision.
A car is traveling with a velocity of 40 m/s and has a mass of 1120 kg. Find the kinetic energy
Answer: I am not sure
Explanation: I am not sure
Which caused the greatest increase of the growth of the human population
Answer:
This rapid growth increase was mainly caused by a decreasing death rate (more rapidly than birth rate), and particularly an increase in average human age. By 2000 the population counted 6 billion heads, however, population growth (doubling time) started to decline after 1965 because of decreasing birth rates.
Explanation:
The main cause of human population growth is increased well-being.
Well-being is a term to refer to the state of satisfaction of economic, social, labor, psychological, biological needs, among others of the human.
Therefore, when civilizations and societies became more complex, many issues such as health, food, hygiene, education, government, among others, improved, giving more well-being to their inhabitants.
Well-being has evolved with society and today people have access to many things, services, and goods that give them well-being, improving their quality and life expectancy. Therefore, the correct answer is well-being.
Learn more at: https://brainly.com/question/10571076
Which type of wave is a combination of two waves?
Answer:
A composite wave
Answer:
surface waves
Explanation:
A wave is moving at 300m/s and has a frequency of 25Hz, what is the wavelength?
Answer:
12 metre
Explanation:
Wavelength = Velocity / Frequency
Wavelength = 300m/s / 25 Hz
Wavelength = 12 metre
Here's a riddle for you guys is it an orange because it taste's like an orange or is it an orange cuz it looks like an orange? and don't say both just think about it for a sec it confusing
Answer:
It tastes like an orange, I don't think that you can replicate taste as much as looks, I could be wrong though. But yes it is confusing.
Explanation:
Can I have brainliest? It would help me out, if not thanks anyways! Please tell me if you need me to elaborate more or show work!! I hope this helped and have a nice day!
I NEED THIS ASAP I WILL MARK YOU THE BRAINLIEST LINKS WILL BE REPORTED
put the correct terms with the correct pictures
Answer:
Mass: Choices 1, 2, 4, 6
Weight: Choices 3, 5, 7, 8
Hope this helped! Please mark Brainliest if correct.
What is the net force in the following diagram?
Which is a benefit of a scientific model?
A.) It provides a complete image of the concept it is modeling.
B.) It provides an accurate scale of the concept it is modeling.
C.) It provides an accurate visual representation of the texture and coloring of the concept it is modeling.
D.) It provides a useful understanding of the concept it is modeling.
A ball experiences forces of 14 N [N] and 9.2 N [W]. A Free Body diagram is required. What is the acceleration of the ball if its mass is 225 g?
Answer:
First, we can define the North as the positive y-axis, and the East as the positive x-axis.
Here we have two forces:
F₁ = 14N to north
F₂ = 9.2 N to west.
Then the free body diagram will be the one that can be seen below:
Now we want to find the acceleration that the ball experiences if the mass is 225g
Knowing that 1k = 1000g, we can rewrite the mass as:
M = 0.225g
Here we also need to remember the second Newton's law:
F = M*a
Net force equals mass times acceleration.
First, let's find the net force:
F = F₁ + F₂ = 14N*(0, 1) + 9.2N*(-1, 0 )
F = (-9.2N, 14N)
The module of the force is then:
I F I = √( (-9.2N)^2 + (14N)^2) = 16.75 N
Then the acceleration is given by
16.75 N = 0.225kg*a
(16.75 N)/(0.225 kg) = a = 74 m/s^2
An increase in population growth __________ the need for natural resources for survival.
A. increases
B. decreases
C. prevents
D. has no effect on
Answer:
A. increases
Explanation:
with more mouths to feed, you need more food, but when your food doesn't increase with your population, then there is a food shortage.
how do atoms relate to the periodic table?
Answer:
The organization of electrons in atoms explains not only the shape of the periodic table but also the fact that elements in the same column of the periodic table have similar chemistry. The same concept applies to the other columns of the periodic table.
Un tubo cilindrico hueco de cobre mide 3 m de longitud tienen un diametro exterior de 4cm y un diametro interior de 2 cm¿cuanto pesa?
Answer:
W = 9.93 10² N
Explanation:
To solve this exercise we must use the concept of density
ρ = m / V
the tabulated density of copper is rho = 8966 kg / m³
let's find the volume of the cylindrical tube
V = A L
V = π (R_ext ² - R_int ²) L
let's calculate
V = π (4² - 2²) 10⁻⁴ 3
V = 1.13 10⁻² m³
m = ρ V
m = 8966 1.13 10⁻²
m = 1.01 10² kg
the weight of the tube
W = mg
W = 1.01 10² 9.8
W = 9.93 10² N
Revise this statement to make it true: Only winter is caused by the tilt of the earth's axis.
Answer:
Only winter is caused by the tilt of the earth's axis.False
it caused summer or autumn too
explain how to find the surface area of a rectangular pyramid
...................
Answer:
So let's first start with the base which is a rectangle remember that the formula to solve the area
Explanation:
25. A car with mass M traveling at speed V has kinetic energy K. What is the kinetic energy of a second car that has the 1/4 times the mass M (1/4 smaller) and twice the speed V (2 x larger) of
the first car?
O 2K
OK
08K
O 4K
Answer: 4k
Explanation: I got it right
llus
A block is on a surface with
μς
0.325. It takes 4.11 N to
break it free from static friction.
How much normal force acts
on the block?
(Unit = N)
Enter
Answer: 12.6 newtons
Explanation:
Take the equation, static force equals static friction times normal force. ( F = μn )
Divide both sides by static friction so normal force is the answer.
( F / μ = n )
Insert your numbers (4.11 F and 0.325 μ) into the equation to get your answer.
( 4.11 / 0.325 = n )
n = 12.6
My first time helping someone and future people on this site. This is the answer I put in and got right.
ACELLUS GANG STAND UP!
the shock absorbers in a car act as a big spring with k= 21900 N/m. when a 92.5 kg person gets in, how far does the spring stretch?
Answer: 0.04139m
Explanation:
First, we need to calculate the weight of the man which will be:
Weight = mass × acceleration due to gravity
Weight = mg
Weight = 92.5 × 9.8
Weight = 906.5N
Then, we calculate the force which will be:
F = kx
mg = kx
x = mg/k
x = 906.5/21900
x = 0.04139m.
The spring stretched for 0.04139m.
what is the frequency of the electromagnetic wave if the period is 1.54x10-15s
[tex]10 { - }^{15} [/tex]
answer✿࿐
I was not able to write it here
so I did it somewhere else and attached the picture
i hope it helps
have a nice day
#Captainpower
Which statement is correct about the equation for work?
O work = force x distance
work = fulcrum x distance
O work = force x direction
Answer:
work equal to Force times distance
A ball is released from a height of 20 metres. Calculate; 1. The time it takes to fall 2. The velocity with which it hits the ground
Answer:
Final velocity of ball = 20 m/s
Explanation:
Given:
Height when ball released = 20meter
Find;
Time taken to fall
Final velocity of ball
Computation:
Initial velocity of ball = 0 m/s
Acceleration due to gravity = 10 m/s²
Using equation of motion;
S = ut + (1/2)(g)(t²)
20 = (0)(t) + (1/2)(10)(t²)
20 = 5(t²)
(t²) = 20 / 5
(t²) = 4
Time taken to fall = 2 second
V = u + at
V = 0 + (10)(2)
Final velocity of ball = 20 m/s
A 4.03 x 10-5 F capacitor stores 5.15 x 10-3 J of energy. What is the voltage across the capacitor?
Answer:
V = 0.06255 Volts
Explanation:
Given the following data;
Capacitance = 4.03 * 10^{-5} F
Energy = 5.15 * 10^{-3} J
To find the voltage across the capacitor;
Mathematically, the energy stored in a capacitor is given by the formula;
E = ½cv²
Where;
C is the capacitor
E is the energy stored
v is the voltage.
Substituting into the formula, we have;
5.15 * 10^{-3} = ½ * 4.03 * 10^{-5} * v²
0.00515 = 0.00002015 * v²
V² = 0.00002015/0.00515
V² = 0.003912
Taking the square root of both sides, we have;
V = √0.003912
V = 0.06255 Volts
Answer:
16 V
Explanation:
someone said 16 V in the comments and it is the correct answer for acellus.
(PLESE HELP) why does boiling pot of water have more temperature that an iceberg