Answer:
The angles of reflection on both sides of the normal are always equal, so the angle of reflection is 70°. 2. The speed of light in diamond is 1.24 x 108 m/s.
Temperature is a measure of
Answer:
degree celsius
Explanation:
it's measured in degree Celsius
Mirrors produce images by doing which of the following to light?
A. Refraction
B. Diffraction
C. Reflection
D. Interference
E. Scattering
Answer: C
Reflection
Explanation: Light travels in a straight line. Reflection is one of the properties of light. And this is the property in which mirror make use of. The ability of light to bounce back. It's this bouncing back characteristics of light ray that eventually produce the image of an object by the mirror.
If the light ray is absorbed, no image will be produced.
A bird sitting on a hinged perch takes off from the perch, pushing the perch
in the opposite direction. The momentum of the perch
Answer:
The momentum of the perch is equal to it's own momentum gather to take off
Explanation:
According to the Newton third law of motion which state that: in every action, there will be an equal and opposite reaction.
This is the law that helps us to walk, paddle boats e.t.c.
And momentum is always conserved. Therefore, the momentum of the perch is equal to it's own momentum gather to take off
What is the difference between a mixture and a pure substance? Give an example of each.
Answer:
A pure substance (an element or a compound) is made up of only one type of atom, or molecule.
Examples: water (H2O molecules), oxygen (O2 molecules), argon (Ar atoms).
A mixture is made of up of more than one type of atom or molecule.
Examples: salt water (H2O molecules, Na+ ions, Cl- ions),
air (N2 molecules, O2 molecules, Ar atoms, CO2 molecules)
Note: the composition of a pure substance is fixed, but the composition of a mixture can vary. Two salt water solutions might not have the same concentration of salt. Or, if you prefer, one blueberry muffin might have more blueberries in it than another blueberry muffin.
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2 A sailboat on a lake sails 40. meters north and
then sails 40. meters due east. Compared to its
starting position, the new position of the sailboat
is
(1) 40. m due east (3) 57 m northeast
(2) 40. m due north (4) 80. m northeast
Answer: 3
57m north east
Explanation:
Given that the boat sails 40. meters north and then sails 40. meters due east. The new position will be known by using pythagorean theorem.
P^2 = 40^2 + 40^2
P^2 = 1600 + 1600
P^2 = 3200
P = square root (3200)
P = 56.6 m
P = 57 m (approximately )
Therefore, the new position of the sail boat will be 57 north east
Compared to its starting position, the new position of the sailboat is 57 m northeast
The given parameters;
initial displacement of the sail boat, x₁ = 40 m north
final displacement of the sail boat, x₂ = 40 m east
The new position of the sail boat when compared with the starting position is the total displacement of the sail boat.
A sketch of the sail boat displacement;
↑ → → → → → → 40 m
↑
↑40 m
↑
The hypotenuse of this right triangle is the total displacement of the sail boat.
[tex]R^2 = 40^2 + 40^2 \\\\R^2 = 3200\\\\R= \sqrt{3200} \\\\R = 56.57 \approx 57\ m[/tex]
The direction of the sail boat is northeast
Thus, compared to its starting position, the new position of the sailboat is 57 m northeast
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6. To which of these abrasive disks can you
apply a water-coolant?
(A) Concrete
(B) Metal
Answer: its B
Explanation:
Metal abrasive disks are used as a water coolant. These are used mostly to slice stones and metals. Grit discs have several advantages over various kinds of discs. They have such a relatively fast cutting speed. The grit disc sander is not a hefty instrument that can be easily held when operating on a scaffold.
Steel cutting fluids are abrasive or peening mediums composed of iron particles. They are typically offered in two sizes (shot and grit) that suit various industrial applications. Since these grains are made from smashed steel shot, they have sharp edges and broken parts.Therefore, the answer is "Option B".
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Along with X-Rays, which high frequency EM waves can be used to destroy
cancer cells? *
Radio
Microwave
Infrared
Gamma
Give me one example of a sport that requires someone to have good reaction time?
Answer:
Baseball
Explanation:
Baseball because the ball can come at you at high speeds and you need to react quickly.
Determine the ratio of the resistivity of pure water to silver?
3 x 10 11.1
1:3
1:3 x 10 11.1
Answer:
[tex]3 \cdot 10^{11} : 1[/tex]
Explanation:
Silver is a generally excellent conductor, this implies its resistivity is low (from table, we can check the exact worth i.e [tex]\rho_s = 1.6 \cdot 10^{-8} \Omega m[/tex])
Pure water, rather, is an extremely awful conductor, this implies its resistivity is exceptionally high, of order of [tex]k \Omega \cdot m (10^3 \Omega m )[/tex]
Indeed, even without knowing the exact estimation of the pure water resistivity, we can appraise the proportion between the pure water resistivity and the silver resistivity by looking at the two orders of magnitude:
[tex]r= \frac{10^3 \Omega m}{10^{-8} \Omega m} \sim 10^{11}[/tex]
Therefore, we can say that the correct answer is
[tex]3 \cdot 10^{11} : 1[/tex]
Which of these does not have an electric charge?
neutron
proton
electron
atom
Answer:
i think its the first one...you could have searched it up though.
Explanation:
Plz ans this fast
Ur ans will be maked as brainliest
u'll get pts too
Plz solve this asap.....
Answer:
1) b,
2)a,
3)3seconds
4)10&30
5)0
Explanation:
Which statement is true about the ideal mechanical advantage of a third-class lever?
A It is always greater than 1.
B It is always equal to 1.
C It is always less than 1.
D It can be less than, greater than or equal to 1.
Answer:
It is always less than one.
Explanation:
Because the load covers more distance than the force when they move in the same direction.
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what is an example of a compressional wave?
Answer:
The wave front expanding out from an explosion is possibly the most dynamic example of a compressional wave. And a pulse of compressed air can transfer a LOT of energy. ... For a literal "compression wave" visualize accelerating a boat across the water, compressing the water it encounters into a "bow wave".
Sound is an illustration of a compressional wave. Mechanical waves like sound waves need a medium to travel through, such air, water, or solids.
A sound wave undergoes compressions and rarefactions as it passes through a medium.
Particles in the medium move parallel to the wave's propagation direction during a compressional wave.
When particles are close to one another, compression regions arise in the case of sound waves, creating high-pressure zones.
Following these compressed zones are rarefactions, when the particles are dispersed and low-pressure areas develop.
Thus, sound is an example of a compressional wave.
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Scientists can use rock layers to determine which of the following? Group of answer choices The mass of Earth The size of Earth The age of Earth The amount of land on Earth
Answer:
The age of the earth
Explanation:
The deeper the layer the older the age
What are physical properties?
Answer:
they are things that can't be turned back the way they were before, like when you mix an egg, you can't get the egg to unmix itself.
Explanation:
Which energy conversion correctly describes what happens when you are dancing
3. If substance A has half the index of refraction of substance B, which is (most likely) more dense
Answer:
The correct answer is A!
Explanation:
If a car is traveling at the speed of light and the car turns on the headlight, what would happen? Would the headlight not turn on at all, would the headlight travel at twice the speed of light, or would the headlight act like a flowing sink flowing out light?
Answer:
flowing sink flowing out light
Explanation:
Please help! Will give brainliest! It’s My last.
Answer:
c is correct option because moon will go away when we come closer to earth and it will cut in round shape...
please mark me BRAINLIEST
Answer:
C.
Explanation:
Because when we closer, it is rounder
Are these dimensional analysis answers correct?
Answer:
yes
Explanation:
because once you learn you get to know more answers that's why you should come to brainly.
please help me and i’ll give you brainliest if correct :)
Answer:
Accurate Measurements
Explanation:
Always put in accurate measurements when arguing
Answer:
accurately measurements
Which describes how chemical changes are different from physical changes?
Select one: a. Chemical changes can be measured, but physical changes cannot. b. Chemical changes involve the formation of a new substance. c. Chemical changes release energy, but physical changes absorb energy. d. Chemical changes cannot be caused by oxygen.
Answer:
B. Chemical changes involve the formation of a new substance.
Explanation:
They can both release energy, both can be measured, and chemical changes can be caused by oxygen, so I believe it would be B.
You have a nightlight plugged into an outlet in the hallway, which uses 3.5 watts when plugged in. If the house circuit provides 120.0 volts, wh
is the current through this bulb?
A. 420 amps
B.
0.029 amps
C.
34 amps
D.
0.0083 amps
Answer:
I = 0.029 A
Explanation:
It is given that,
Power of hallway is 3.5 watts
The house circuit provides 120 volts
We need to find the current through this bulb. The power of electric bulb is given by :
[tex]P=VI[/tex]
[tex]I=\dfrac{P}{V}\\\\I=\dfrac{3.5}{120}\\\\I=0.029\ A[/tex]
So, the electric current is 0.029 A.
Answer:
I = 0.029 A
Explanation:
Which example shows separation of different wavelengths of light due to diffraction?
Answer:
spectrum
Explanation:
The spectrum formed different colors due to refraction of light
Answer:
A A A A A
Explanation:
correct on edge:)
cynthia sprints 60 meters in 5 seconds during soccer practice. what is her speed. please show your work
Answer:
12 m/s
Explanation:
Speed can be found using the following formula.
[tex]s = \frac{d}{t}[/tex]
where s is speed, d is distance traveled and t is the time.
We know that Cynthia sprinted 60 meters in 5 seconds. Therefore, the distance is 60 meters and the time is 5 seconds.
d=60
t=5
Substitute these values into the formula.
[tex]s=\frac{60}{5}[/tex]
Divide
[tex]s=12[/tex]
Add appropriate units. For this problem, the appropriate units would be meters per second, or m/s.
[tex]s=12 m/s[/tex]
Cynthia's speed is 12 meters per second.
HELP PLZZZZZ Consider the following data:
Current (A)
Resistance (Ω)
0.9
10
0.18
50
0.09
100
Which relationship is shown in this data?
As you increase the current, the resistance increases.
As you increase the resistance, the current decreases.
As you decrease the resistance, the current decreases.
There is no relationship between current and resistance.
Answer:
I think the answer is As you increase the current the resistance increases too.
a. Write 2-3 sentences describing what happens to a uranium nucleus during nuclear
fission. (2 points)
b. Write 2-3 sentences explaining why nuclear fusion cannot be used in power plants, yet
can still be the original source of the electric energy used in homes. (4 points)
c. Write 3 - 4 sentences evaluating the use of nuclear fission to generate electric energy. Provide at least one point in favor of and two points against using fission. (3 points)
Answer:
Through their studies of radioactive elements, they discovered nuclear fission.
The atoms then undergo nuclear fission, producing daughter nuclei and more neutrons.
Critical mass is the minimum mass of fissionable material required to sustain a nuclear fission reaction.
Imagine an energy source that is more powerful than nuclear fission or even nuclear fusion.
The products of uranium mining and nuclear fission remain radioactive for hundreds of thousands of years.
Health officials did not test for Strontium 90, a radioactive carcinogenic byproduct of nuclear fission.
And no one's going to be able to invent all the hydrogen-powered cars and nuclear fission energy we're supposed to have in the future.
The development of nuclear fission weapons and later thermonuclear fusion weapons represented an incomparable revolution in weaponry.
The element can be prepared artificially in particle accelerators and is a byproduct of nuclear fission reactions.
Nuclear fusion reactions are like nuclear fission reactions, therefore, in the respect that some quantity of mass is transformed into energy.
Before World War II, German chemists Otto Hahn and Fritz Strassmann discovered nuclear fission.
Element 109 is named meitnerium, for Lise Meitner, who was the first to realize that uranium undergoes nuclear fission.
The reason is that nuclear fission occurs best with neutrons that move at relatively modest speeds, called thermal neutrons
The simple atom bomb owed its explosive power to the energy released by nuclear fission, or fusion.
An atomic bomb is a weapon of mass destruction which uses nuclear fission to produce vast amounts of energy.
These engines use the heat of nuclear fission to drive steam turbines, which in turn charge the batteries.
Pellets of nuclear fuel are contained within the fuel rods of nuclear fission reactors.
It is likely that nuclear fission, hydroelectricity, wind power and direct solar power will be important sources for future electricity generation.
Their research provided the groundwork for other modern-day solutions that use microwave energy and light to propel ships, rather than nuclear fission.
Why is the public too dumb to understand the Privy Council, too unscientific to understand genetic engineering, but is now an expert on nuclear fission? btw this is for c
Answer:
A.When a large, fissile atomic nucleus such as uranium-235 absorbs a neutron, it may undergo nuclear fission.In the first step, a uranium-235 atom absorbs a neutron, and splits into two new atoms, releasing three new neutrons and a large amount of binding energy.
B. One of the biggest reasons why we haven't been able to harness power from fusion is that its energy requirements are unbelievably, terribly high. In order for fusion to occur, you need a temperature of at least 100,000,000 degrees Celsius. That's slightly more than 6 times the temperature of the Sun's core.
C. You would need less uranium to fuel it and it would generate better electricity, but its energy requirements are too high, and we would not be able to control it
Explanation:
a charged particle is 2×10^-4C determine the quantum number of the charge
Answer:
wedf
Explanation:
Look at the figure below and calculate the length of side x.
A. 12.6
B. 14.5
12
C. 10.3
u
у
O D. 8.5
45
Answer:
8. 484 so 8.5cm is the answer
Explanation:
Trig ratio.. I used cosine here
Cos 45= x /12
X = 12 x cos 45
= 12 x 0.707
= 8.484
=8.5
Adding a best-fit line to the scatter plot shown below would be an example of _____.
A. making an inference
B. drawing a conclusion
C. checking a prediction
D. correcting a hypothesis