Answer:
False
Explanation:
Light refracts whenever it travels at an angle into a substance with a different refractive index (optical density).
Amjad holds a brass cylinder in each hand. Cylinder A
has a mass of 100.0 g and cylinder B has a mass of 300.0 g. What upward forces do his two hands exert to keep the cylinders at rest? If he then drops the two, with what acceleration do they fall? (Ignore air resistance.)
(with explanations)
Answer:
oh hi chimmy
Explanation:
jimmi jimmi jimin
Answer: 0.98N for Cylinder A and 2.943N for Cylinder B
Explanation:
Cylinder A = 100g = 100*10^-3kg =0.1kg
Cylinder B = 300g = 300*10^-3kg = 0.3kg
gravitational force g= 9.81m/s^2
For cylinder A Force = mg= 0.1*9.8=0.98N
For Cylinder B Force = mg= 0.3*9.81= 2.943N
Suppose the collision between the packages is perfectly elastic. To what height does the package of mass m rebound?
The height, h to which the package of mass m bounces to depends on its initial velocity, v and the acceleration due to gravity, g and is given below:
[tex]h = \frac{v^{2}}{2g}[/tex]
What are perfectly elastic collision?Perfectly elastic collisions are collisions in which the momentum as well as the energy of the colliding bodies is conserved.
In perfectly elastic collisions, the sum of momentum before collision is equal to the momentum after collision.
Also, the sum of kinetic energy before collision is equal to the sum of kinetic energy after collision.
Since some of the Kinetic energy is converted to potential energy of the body;
[tex]\frac{mv^{2}}{2} = mgh[/tex]
[tex]h = \frac{v^{2}}{2g}[/tex]
Therefore, the height to which the package m bounces to depends on its initial velocity and the acceleration due to gravity.
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Read the length of the metal bar with the correct number of significant figures. 15.000 cm 20 cm 15.0 cm 15 cm 15.00 cm
The correct number from the options to describe the length of this metal bar is 15 cm or fifteen centimeters.
What are the units used to measure length?The most common units to measure length include:
CentimeterMeterKilometerMilesHow much does this bar measure?The unit that should be used is centimeters, considering a rule usually contains centimeters, and this is the unit provided in the image.
Moreover, based on the rule it can be determined the length is 15 centimeters. Other numbers such as 15.0 or 15.000 are innaccurate as there is not need to add more figures in this case.
Note: This question is incomplete because the image is missing. Here is the image
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A spring hangs at rest from a support. If you suspend a 0.46 kg mass from the spring it elongates 0.79m.
A) Determine the spring constant.
B) Calculate the elongation if you put a .75kg mass on the spring.
a. The restoring force in the spring has magnitude
F[spring] = k (0.79 m)
which counters the weight of the mass,
F[weight] = (0.46 kg) g = 4.508 N
so that by Newton's second law,
F[spring] - F[weight] = 0 ⇒ k = (4.508 N) / (0.79 m) ≈ 5.7 N/m
b. Using the same equation as before, we now have
F[weight] = (0.75 kg) g = 7.35 N
so that
(5.7 N/m) x - 7.35 N = 0 ⇒ x = (7.35 N) / (5.7 N/m) ≈ 1.3 m
A wave has a frequency of 20.0 Hz and a velocity of 5.0 m/s. What is its wavelength?
Answer:
0.25 m
Explanation:
λ = v/f
I hope it helped you
What’s the difference between jumping with ur leg straight and ur leg bend
When a chunk of cosmic material the size of a golf ball or a baseball hits the Earth's atmosphere it makes a
When a chunk of cosmic material the size of a golf ball or a baseball hits the Earth's atmosphere it makes a fireball.
What is meteor shower?Meteor shower is an event that occurs when tiny particles of stones that are of the size of a golf ball or baseball hits the earth's atmosphere.
As the particles enters the earth's atmosphere, they create friction through rubbing against the particles of the air. This eventually causes the particles to heat up leading to the formation of a fireball.
Meteor shower usually occurs between midnight and the very early hours of the morning.
Therefore, when a chunk of cosmic material the size of a golf ball or a baseball hits the Earth's atmosphere it makes a fireball.
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A second-grade teacher dropped a box of paper clips and they scattered all over the floor. She then asked her students, "Why will a magnet be a useful tool to pick the paper clips?"
The magnet will be a useful tool to pick the paper clips because the magnet can attract the paper clips.
Attraction of magnetsThe like poles of magnets repel while unlike poles of magnets attracts. Magnets attracts irons or metallic materials.
The paper clips are mettalic or made of iron and hence the magnet will attract them.
There we can conclude that the magnet will be a useful tool to pick the paper clips because the magnet can attract the paper clips and will help to gather them together for easy picking.
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What do these two changes have in common?
a piece of avocado turning brown
a dinosaur bone turning into rock over millions of years
Select all that apply.
Both are only physical changes.
Both are chemical changes.
Both are caused by heating.
Both are caused by cooling.
Submit
a piece of avocado turning brown a dinosaur bone turning into rocks over millions years physical or chemical
Answer:
they have nothing in common, the avocado turning brown is a chemical change while, the dinosaur bone turning into rocks over millions of years is a physical change.
In what part of the atom are the
protons located?
A. in the nucleus Thy
B. in the neutron
C. in the electron
Answer:
In the neucleus :)
Explanation:
Protons are found insidde of the neucleus of an atom. Electrons are found on the outside of the neucleus. :)
Have an amazing day!!
Please rate and mark brainliest!!
Answer:
nucleus
Explanation:
Protons ans nuetrons are inside the nucleus
how many levels does the philippine physical activity pyramid have?
When there's a hazard ahead, it's almost always quicker for you to _________ than to come to a full stop.
When there's a hazard ahead, it's almost always quicker for you to steer away than to come to a full stop.
What is an hazard?Hazard refers to any obstacle or other feature which causes risk or danger.
Living organisms respond to hazards via the production of adrenaline hormone. This hormone causes a flight response away from the hazard.
Therefore, when there's a hazard ahead, it's almost always quicker for you to steer away than to come to a full stop.
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The most straightforward way to determine the distance to a nearby star involves the measurement of the: ________
Answer:
The Answer is Star's Parallax.
Explanation:
It is the straighforward way to determine to find the distance to a nearby star.
A 3.0- resistor is connected in parallel with a 6.0- resistor. This combination is connected in series with a 4.0- resistor. The resistors are connected to a 12-volt battery. How much power is dissipated in the 3.0- resistor
Answer:
5.33 w
Explanation:
parallel resistors equivalent r = r1 r2 /(r1+r2) = 2 ohm
in series with 4 ohm resistor makes total r = 6 ohms
12 v / 6 ohm = 2 amps current
2/3 of the current will go through the 3 resistor
2/3 * 2 = 4/3 amp
power = I^2 R = 4/3 ^2 * 3 = 5.33 watts
Determine the energy in ev of a photon when electron transit from third level to the first level
energy of hydrogen atom *
A) 12 ev
B) O 1.2 ev
C) 0.12 ev
Answer:
One way of writing frequency difference for "Lyman" series is
f = 3.289 * 10^15 (1 / 1^2 - 1 / n^2)
f = 3.289E15 * (1 - 1/9) = 2.924E15 as frequency difference of terms
E = h f = 6.63E-34 * 2.924E15 = 1.938E-18 Joules
1 eV = 1.60 * 10^-19 Joules
1.938 / .16 = 12.1 eV
The mass of a body is 25 kg and the value of acceleration due to gravity is 9.8 m/s2. Calculate the weight of body
Explanation:
[tex]w = mg \\ w = 25kg \times 9.8 \frac{m}{s} ^{2} \\ w = 245\\ [/tex]
Roxanne’s italian teacher was talking about how adjectives are placed after the noun, unlike in english. the teacher is instructing the students in the __________ of italian. semantics morphemes phonemes syntax
The teacher is instructing the students in the syntax of italian.
What is an adjective?Adjectives are words that are used in English language to modify or describe a noun or a pronoun. Usually, adjectives are placed before the nouns they modify.
But creation of sentence, using words, to form a meaning the adjective can be placed after a noun. This is seen in formation of sentences using Italian language.
Syntax is the arrangement of words to creat a meaningful sentence. The most basic syntax follows a subject + verb + direct object formula.
Therefore, the teacher is instructing the students in the syntax of italian.
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Answer:
d. syntax
Explanation:
Describe at least one technological application of radioactive decay that can benefit human health.
Answer:
Radiotherapy
Explanation:
Answer:
Radioisotopes are used in medicine as tracers to detect and diagnose medical problems. Radioisotopes are also used in radiation therapy to treat cancer.
Explanation:
sample answer on edge:3
An explosion is done on moon what effect will be its on earth
A. We can hear
B. We can see
C. We can hear and see
D. None
Answer:
d. none is the answer we can't hear and see
What is meant by a zero error in an ammeter?
Answer:
When the circuit is not connected, the pointer of the ammeter or voltmeter is exactly at zero, thus said to be the instrument has zero error. If the pointer is above the zero mark, the zero error is negative.
How does your Liver work with your Bladder in your body?
Answer:
The liver filters the blood of toxins before it continues through the body. It also removes excess sugar from the arteries. Your kidney then further filters the blood for water-soluble waste and toxins to be excreted and finally, your bladder gets read of that water-soluble waste.
Give 2 to 3 examples of conservations of energy.
Answer:
1. Energy can neither be created or destroyed.
2. Conduction. Putting a pot of water on a hot burner. Convection. Putting your wet shoes over an air vent to dry them quicker. Radiation. Sitting in front of the fire to warm your hands up.
3. renewable sources can be used again and again, but non renewable sources cannot.
4. I would recommend solar energy. I think solar energy should be considered because solar energy can be reused, and also because they can use it to power their houses and they wouldn't need fossil fuels to do so.
5. Turn off the lights and open the windows during the day and if something is left plugged into the wall and it is not being used, unplug it.
hope I could help!
Explanation:
A driver needs to make a delivery to an office that is 30 km away. The driver has traveled for 45 minutes west down a straight road at 50 km/h. a. Has the driver traveled far enough to reach the office? Support your response.
Answer:
Yes, the driver has traveled far enough to reach the office.
Explanation:
Starting at 50 km/h you can break the 50 into 4 sections (50/4 or 1/4 of 50) and that will get you 12.5
45 minutes are 3/4 of an hour which is 50 km/h.
12.5*3=37.5 km (37.5>30)
Which reduces friction, to roll or to slide?
What is the argument the author presents in lines 8-10? A) One is not expected to retaliate to threats and injury. B) One is not expected to simply accept threats and injury. C) One is expected to understand the likelihood of threats and injury. D) One is not expected to threaten, harm or injure people or property.
We can actually see that the argument the author presents in lines 8-10 is: D. One is not expected to threaten, harm or injure people or property.
What is argument?Argument, refers to the statement (s) that are made with the intention of determining the degree of truth of another statement.
We see here that the author presents an argument in lines 8-10 and the argument is "one is not expected to threaten, harm or injure people or property."
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According to Newton's 1st Law of Motion, a moving object will move forever at a constant rate in the same direction. Why do objects stop moving?
Please help!
Answer:
Object stop moving when the force which is friction that acts to resist sliding between two touch-ing surfaces is not present
Answer:
See below ~
Explanation:
Newton's 1st Law of Motion : "An object in motion (or rest) will stay in motion (or rest) unless acted upon by an unbalanced force.
Objects stop moving due to the application of forceAn ball rolling on the road stops due to the frictional force of the roadAn apple falls from the tree due to gravitational forceWe can alter the motion of a football by applying force
A symptom of schizophrenia could be having unusual beliefs that have no factual basis. please select the best answer from the choices provided t f
A symptom of schizophrenia could be having unusual beliefs that have no factual basis. The given statement is true.
What is the definition of schizophrenia?
Schizophrenia is a serious mental illness that impairs a person's ability to think. It mostly affects persons between the ages of 16 and 35. A mental health practitioner can diagnose the onset of schizophrenia.
Schizophrenia symptoms include:
1. Delusions are irrational ideas or perceptions that have no basis in reality.
2. Disorientation is a symptom of an inability to perform normally. When a person has hallucinations, he or she sees or hears things that are not real.
So, having strange views with no factual foundation might be an indication of schizophrenia, which is TRUE.
Hence the given statement is true.
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Answer:
true
Explanation:
got 100 on Edge
At peak brightness, the white dwarf supernova is approximately __________ times as luminous as the massive star supernova at its peak brightness.
Answer:
3
Explanation:
3 times as lumiunous
PLEASE I NEEDHELP !!!!!!!!!!
In the diagram, q1 and q2 are both
+5.00*10^-8 C. What is the electric field
at point P? Include a + or - sign to
indicate the direction.
91
P
92
0.636 m
+ 0.424 m-**
(Remember, E points away from + charges,
and toward - charges.)
(Unit = N/C)
Answer:
1389.1
For Acellus
Explanation:
The electric field equals the force exerted by the unit positive charge. The electric field at point P is 3.615×10⁶ N/C. Its unit is N/C.
What is an electric field?
When a charged particle is got influenced by another charged particle when bring near to it, a field is created by an electric charge. This field is called the electric field.
The electric field is obtained by taking the ratio between Force and unit positive charge. Force in a charge is because of attraction and repulsion. The SI unit of force is Newton (N).
The unit positive charge is the test charge used to analyze the other charges present in the field. The SI unit of charge is Coloumb (C). The charge is responsible for the creation of an electric field.
From the givens,
The charge q₁ = q₂ = 5×10⁻⁸ C,
The distance of charges from point P, r₁ = 0.424 m; r₂ = 0.636 m.
The net electric field E = E₁ + E₂
Electric field E = F / q
E₁ = kq₁ / r₁² (k = 9×10⁹ Nm²/C²)
= 9×10⁹× 5×10⁻⁸ / (0.424)²
E₁ = 2.503×10³ N/C.
E₂ = kq₂ / r₂²
= 9×10⁹× 5×10⁻⁸ / (0.636)²
E₂ = 1.112×10³ N/C
E = E₁ + E₂
=2.503×10³ + 1.112×10³
= 3.615×10³ N/C
Hence, the net electric field is 3.615×10³ N/C.
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The radium isotope 223Ra, an alpha emitter, has a half-life of 11. 43 days. You happen to have a 1. 0 g cube of 223Ra, so you decide to use it to boil water for tea. You fill a well-insulated container with 460 mL of water at 16∘ and drop in the cube of radium
The time taken for the water to boil at the given rate of the alpha decay is 0.08 s.
Number of radium atom
The number of radium atom in 1.0 g is calculated as follows;
[tex]N = N_A(\frac{m}{M} )\\\\N = (6.02 \times 10^{23})(\frac{1}{223} )\\\\N = 2.7 \times 10^{21} \ atoms[/tex]
Decay constant of the radium[tex]\lambda = \frac{ln2}{t_{1/2}} \\\\\lambda = \frac{ln 2}{(11.43 \times 86400)} \\\\\lambda = 7.02 \times 10^{-7} \ s^{-1}[/tex]
Rate of the alpha decayR = λN
R = (7.02 x 10⁻⁷) x (2.7 x 10²¹)
R = 1.895 x 10¹⁵ atoms/s
Change in the mass of the RadiumΔm = m(Ra₂₂₃) - [m(Rn₂₁₉) + m(α)]
Δm = 223.018u - (219.008u + 4.0026u)
Δm = 0.0074u
Energy released in the alpha decay[tex]E =\Delta mc^2\\\\E = 0.0074u \times c^2\\\\E = 0.0074 \times931.5\ MeV/c^2 \times c^2\\\\E = 6.893 \ MeV\\\\E = 6.893 \times 10^6 \times 1.6\times 10^{-19} \\\\E= 1.103 \times 10^{-12} \ J[/tex]
Rate at which energy is releasedP = E/t = ER
P = (1.103 x 10⁻¹²)(1.895 x 10¹⁵)
P = 2,089.99 J/s
Mass of the boiled watermass = density x volume
mass = (1 g/L) x (0.46 L)
mass = 0.46 g
Heat absorbed by the waterQ = mcΔT
Q = 0.46 x 4.184 x (100 - 16)
Q = 161.67 J
Time taken for the water to boilPt = Q
t = Q/P
[tex]t = \frac{161.67}{2,089.99} \\\\t = 0.08 \ s[/tex]
Thus, the time taken for the water to boil at the given rate of the alpha decay is 0.08 s.
The complete question is below:
How long will it take the water to boil?
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