Answer:
Alpha decay is the least penetrating. This is because the Alpha particle produced during the decay process is relatively large and low in energy thus it is easily 'blocked' and does not travel far through space.
Explanation:
The ratio of force and mass is known as
A. Velocity B. Momentum C. Acceleration D. Displacement
Answer:
Acceleration
Explanation:
We know that Force = Mass * Acceleration according to the formula.
Divide both sides by “Mass” which leaves us with Force/Mass = Acceleration, in word, it’s ratio of force and mass equals acceleration.
You walk to school every day. It is 0.5 miles. After school you walk to Kroger, which is 1.3 miles. You leave Kroger to go all back home, which is 0.8 miles. What is the total distance you have walker today?
can someone please tell me how to calculate the initial kinetic energy
In classical mechanics, kinetic energy (KE) is equal to half of an object's mass (1/2*m) multiplied by the velocity squared. For example, if a an object with a mass of 10 kg (m = 10 kg) is moving at a velocity of 5 meters per second (v = 5 m/s), the kinetic energy is equal to 125 Joules, or (1/2 * 10 kg) * 5 m/s2
Who should be the cert team leader's first concern?
Answer:
to ensure the safety of those in need
Explanation:
Most meteors burn up in the
Answer:
the Mesosphere
Most meteors burn up in the mesosphere. Unlike the stratosphere, temperatures once again grow colder as you rise up through the mesosphere.
Explanation:
Have a nice day
Answer:
The Mesosphere
Explanation:
It is the coldest layer.
Which of the following is evidence that electromagnetic radiation can be described by the wave model?(1 point)
Atoms absorb and emit electromagnetic radiation at discrete energy values.
Light from a flashlight spreads out to illuminate a dark room.
Electromagnetic radiation loses energy when it scatters off charged particles.
Light travels from faraway stars to Earth.
Answer:
Light travels from faraway stars to earth.
Answer:
light from a flashlight spreads out to illuminate a dark room
Explanation:
just took the quiz
When an object is lifted 12 meters off the ground, it gains a certain amount of potential energy. If the same object is lifted 24 meters off the ground, its potential energy is
A.
the same.
B.
three times as much.
C.
twice as much.
D.
four times as much.
Why is the speed of different sounds in a single medium remain the same though wavelength is different?
Answer:
I think it's because the refractive index of that medium is constant
When studying the photoelectric effect, which parameters did scientists think were relevant for electrons to be released or not in both the wave and particle models?
A. intensity only for both models
B. frequency and intensity for the particle model; frequency only for the wave model
C. frequency only for both models
D. frequency and intensity for the wave model; frequency only for the particle model
I marked it as B, but I am not certain.
Answer:
D.
Explanation:
The answer should be D. frequency and intensity for the wave model; frequency only for the particle model.
I hope it helps! Have a great day!
Anygays-
The parameter will be frequency and intensity for the wave model and the frequency only for the particle model.
What is the photoelectric effect?When a medium receives electromagnetic radiation, electrostatically charged particles are emitted from or inside it.
The emission of ions from a steel plate when light falls on it is a common definition of the effect. The substance could be a solid, liquid, or gas; and the released particles could be protons or electrons.
The above effect is the photoelectric effect. Frequency and intensity for the wave model; frequency only for the particle model.
Hence option D is correct.
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whay happen to your eyes when you suddenly exit out of s cinema hall?why?
Answer:
They take a little bit to adjust to the light.
Explanation:
Because being in the dark cinema for so long, out eyes had gotten used to it being that dark while watching the movie. When we leave or go outside from it, it is a lot brighter out and our eyes arent adjusted.
How much work is done by a constant horizontal 20-N force pushing a 50-kg block a distance of 10 m on a horizontal surface
Answer:
200 Nm
Explanation:
Work Done by Particular Force = Particular Force × Distance
Look at the diagram. Both cars start from the same point. Which describes the motion shown?
A:One car travels south at 4 m/s. The other car travels east at 2 m/s.
B:One car travels north at 4 m/s. The other car travels west at 2 m/s.
C;One car travels north at 2 m/s. The other car travels east at 4 m/s.
D: One car travels south at 4 m/s. The other car travels west at 2 m/s. 7 of 10
The original photo wouldn't load...
Answer: The answer is C.
Explanation: C is the correct answer. The magnitude of the vector increases with the length of the line. Consider a compass when it comes to direction.
If a 2 meter diameter ball representing the Sun were placed in Center Circle in Indianapolis, how far away should the Earth be placed?
By applying the correspondent change of scale, we will see that Earth should be placed 214.8m away from the scale sun.
How far the Earth should be placed?The real radius of the Sun is:
R = 696,340 km
And the radius of the scale Sun is 1m, then we have the relation:
1m = 696,340 km
1 = (1m/696,340 km)
Now, the real distance between the Sun and Earth is:
d = 149,600,000 km
If we apply the change of scale we have above, we will get:
d = 149,600,000 km*(1m/696,340 km) = 214.8m
So the Earth should be placed at 214.8m of the ball that represents the sun.
If you want to learn more about changes of scale, you can read:
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The probability that a randomly chosen nucleus in a radioactive sample will have decayed in a given time is 96.875%. How many half-lives has the sample experienced?
A. 5
B. 4
C. 6
D. 3
I believe it's 4, but I'm not entirely sure.
The probability that a randomly chosen nucleus in a radioactive sample will have decayed in a given time is 96.875%. The sample has experienced 5 half lives. The correct option is A.
What is half life?Half life is the time required for the heavy nucleus or any radioactive material to disintegrate by half its quantity.
After one half life, the probability of decay of any nucleus is given by 50%. = 0.5
After two half lives gone, probability of decay is 0.5 + 1/2(0.5) = 0.75
After, three half lives gone, probability of decay is 0.5 + 1/2(0.5) + (1/2)²(0.5) = 0.875
After, four half lives gone, probability of decay is 0.5 + 1/2(0.5) = 0.875 + (1/2)³(0.5) = 0.9375.
After, five half lives gone, probability of decay is 0.9375 + (1/2)⁴(0.5) = 0.96875.
Thus, the sample has experienced 5 half lives. The correct option is A.\
Learn more about half life.
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initial velocity 0 km/hr, final velocity 24km/hr, time 3s, what is acceleration
Answer:
8 km/hr
Explanation:
Acceleration
=Change in Velocity/ Time
=(24-0)/3
=8
The acceleration of the body is {a} = 8 km/hr².
What is acceleration?Acceleration is defined as the rate of change of velocity per unit time.
Given is -
Initial velocity : 0 km/hr
Final velocity : 24km/hr
Time : 3s
We can write the acceleration as -
a = Δv/Δt
a = (24 - 0)/(3 - 0)
a = 24/3
a = 8 km/hr²
Therefore, the acceleration of the body is {a} = 8 km/hr².
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During which month will the pointer stars of the Big Dipper point directly upward, away from the horizon?
Pls helppp
Answer:
April
Explanation:
This type of soil is found in warm, humid climates. question 5 options: pedocal laterite pedalfer humus
Answer:
Laterite would be your answer.
Explanation:
I hope this helps!
Laterite is the type of soil is found in warm, humid climates.
What is laterite soil?Laterite is rich in iron and aluminum soil and rock type that is thought to have originated in hot, humid tropical climates. Nearly all laterites are of rusty-red hue, because of significant iron oxide concentration.
They form as a result of intense and extended erosion of the underneath rock material, which occurs most often when there are high temperatures and significant rainfall, with alternate wet and dry intervals.
Tropical weather is a long-term chemical weathering process that results in a wide range of soil thickness. Laterite is the type of soil is found in warm, humid climates.
Hence laterite is the correct option.
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Which of the following statements is true for both solar energy and wind energy? (1 point)
O Energy collection equipment can be installed in agricultural areas without affecting crop production
O Power from this energy source can easily be integrated into existing power grid systems.
O Energy is able to be collected both day and night.
O Power generation using this energy source does not contribute to water pollution
The statement that is true for both solar energy and wind energy is that power generation using this energy source does not contribute to water pollution.
What is solar and wind energy?Solar energy is the energy in the form of electromagnetic radiation emitted from the Sun while wind energy is the energy generated from from moving currents of the wind using wind turbines.
Solar and wind energies are both renewable sources of energy i.e. they cannot be exhausted.
However, the generation of power from both solar and wind sources does not pollute water.
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A force of 1 N is equal to which combination of SI units?
O A. 1J/m-s2
OB. 1 kg-m/s2
O C. 152-kg/m
D. 1 m/J's
SUBM
Answer:
F = M a = kg * m/s^2
1 N = 1 kg * m/s^2
(B) is correct
The blood travels through the body in tubes called
Blood travels through the body in tubes called arteries and veins.
What are blood vessels?Blood vessels are tubes through which the blood circulates in the body. Blood vessels include the following;
network of arteries, arterioles, capillaries, venules and veinsThus, we can conclude that blood travels through the body in tubes called arteries and veins.
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A resistor of 4 ohms is connected isn series to a box speaker of unknown resistance.If a current of 0.6A flows through the speaker when a voltage of 12V is applied across the combination, calculate: 1. the total resistance in the circuit. ii. the resistance of the speaker ili. the voltage applied across the speaker
Answer:
the total resistance: 20 ohms
the resistance of the speaker: 16 ohms
the voltage across the speaker: 9.6V
A saddle weighs 250 newtons. The mass of the saddle is __________ kilograms. Use g = 9.8 N/kg for gravity.
Answer:
saddle weighs 250 newtons. The mass of the saddle is ____250/9.8 kg______ kilograms. Use g = 9.8 N/kg for gravity.
If we want to get an estimate for the average distance from the sun to a planet, how might we go about doing this? (Choose one answer):
1. By measuring the eccentricity of the orbit, which is directly
related to the size of the orbit's ellipse and hence the distance
from the sun.
2. Measure its orbital period (the time it takes to complete a
single orbit) because Kepler's third law allows us to calculate
the orbit's semi-major axis from this.
3. This cannot be done without sending a probe to the planet.
We have done this for some planets already, but not others.
The distance between the sun and a planet can be gotten by measuring its orbital period and applying the Kepler's law.
Kepler's lawsAccording to Keplers third law; the cube of the distance between a planet and the sun is directly proportional to the square of the period of the same planet.
Having said that, we know that we can best measure the distance between the sun and a planet by measuring its orbital period and applying the Kepler's law.
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which statment about scientific knoledge is false
HELP FAST!!!!!
I DONT UNDERSTAND
Answer:
A
Explanation:
Hope this helps! Please let me know if you need more help or think my answer is incorrect. Brainliest would be MUCH appreciated. Also remember to rate answers to help other students, While leaving thanks to answers that help you. Have a great day!
An erect object is 50 cm from a concave mirror of radius 60 cm. In the situation above, the object is moved to a new position, such that the new lateral magnification is 2.5. The new object distance, in cm, is closest to:
For an erect object is 50 cm from a concave mirror of radius 60 cm. In the situation above, the object is moved to a new position, the new object distance is mathematically given as
u = -18cm
What is the new object distance?
Generally, the equation for magnification is mathematically given as
1/f = 1/v +1/u
therefore,
-1/30 = 1/v + 1/u
v = -2.5u
Hence,
-1/30 = -1/2.5u + 1/u
-1/30 = (3/5)u
u = -18
In conclusion, the new object distance is
u = -18cm
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A radioactive sample starts with 800,000 undecayed nuclei. After 12 hours, 700,000 of the nuclei have decayed. What is the half-life of the sample?
A. 3 hours
B. 12 hours
C. 6 hours
D. 4 hours
Answer:
100,000 / 800,000 = 1 / 8 amount of sample after 12 hours
(1/2)^n = 1 / 8 after n half-lives 1/8 of sample will be left
n = 3
(D) is the correct answer - 1/2 half-life = 4 hours
How much required force is required to move a 100kg box to get it moving? Static friction is 0.5, kinetic friction is 0.3 and gravity is 9.5m/s^2
Answer:
47.5 N
Explanation:
Given
mass, m = 100 kgcoefficient of static friction, μ(s) = 0.5coefficient of kinetic friction, μ(k) = 0.3gravity due to acceleration, g = 9.5 m/s²Solving
It asks the required force to get it moving ⇒ static frictionForce required to move = μ(s) x m x gF = 0.5 x 100 x 9.5F = 95 x 0.5 = 47.5 Nthe placement of the Sun, the Moon, and Earth in each circumstance is
Answer:
Tides and Water Levels
Explanation:
When the sun, moon, and Earth are in alignment (at the time of the new or full moon), the solar tide has an additive effect on the lunar tide, creating extra-high high tides, and very low, low tides—both commonly called spring tides
:)
Starting in 2009, astronomers have been discovering really cool objects out there (cool here meaning low-temperature, as well as really interesting), which they have called Y dwarfs. What distinguishes these brown dwarfs from others that astronomers have discovered
These brown dwarfs can be distinguished from other star-like objects because they exhibit absorption lines from the ammonia molecule in the spectra.
What are brown dwarfs?Brown dwarfs are star-like (small) objects in the external space that exhibit very low cold temperatures.
Brown dwarfs are not only small stars but also huge gaseous planets such as Saturn and Jupiter.
In consequence, brown dwarfs are a wide category that includes both planets and star-like objects.
Learn more about brown dwarfs here:
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