The half life of uranium-235 is 4. 5 billion years. If 0. 5 half-lives have elapsed, how many years have gone by?
a. 9 billion
b. 2. 25 billion
c. 4. 50 billion
d. 4. 0 billion
Answer:
2.25 billion years
Explanation:
i am smort
Which layer of the sun is where plasma rises and sinks due to temperature differences?.
Answer:
Just beneath the photosphere, and extending inward to about 0.7 Rsun, is the convection zone. Energy generated in the core of the Sun moves outward through this layer by a boiling motion in which hot plasma rises, releases some of its energy, cools, and then sinks again.
Explanation:
A pebble of mass 50g is moving with a velocity of 20m/s.What is its kinetic energy?
[tex] \bf\sf \underline{Given: - }[/tex]
[tex] \text{Mass of pebble= 50g}[/tex][tex] \text{Velocity of pebble= 20m/s}[/tex][tex] \bf\sf \underline{To \: Find: - }[/tex]
[tex] \text{Kinetic Energy of Pebble}[/tex][tex] \bf\sf \underline{Solution: - }[/tex]
We know that, to find the Kinetic energy we are required mass and velocity and Here Both parameters are provided But mass is in gram so we need change it into kg,
1g = 0.001kg,
⠀⠀⠀50g = 0.05g
Now we know the formula of Kinetic energy,
[tex] \sf \boxed{ \star\bf{\: Kinetic \: energy = \frac{1}{2} m {v}^{2}}} \\ \\ \qquad \qquad = \frac{1}{ \cancel2} \times 0.05 \times \cancel{20}\times 20 \\ \\ \qquad \qquad =0.05 \times 200 \\ \\ \qquad \qquad \sf = 10J \: [/tex]
Hence, the kinetic energy of the pebble is 10J.
How is "one second time" defined in SI system?
Answer:
Since 1997: A second is a time equal to 9,192,631,770 periods of radiation corresponding to the transition between two hyperfine levels of the ground state of the cesium-133 atom.
This definition refers to a caesium atom at rest at a temperature of 0 K
Explanation:
explain how to identify the points under compression and tension
Answer:
Pls make me brainliest
Explanation:
the compression force is the force generated from compressing an object or substance. When shearing forces are aligned into each other, they are called compression forces.
The compression force is used to power everything from compression brakes to hand tools. The compressive strength of materials and structures is an important engineering consideration.
The compression force can be visualized by placing an object on a spring. When the spring is compressed and then released, the object is ejected into the air.
This is a result of the compression force that is generated from compressing the spring.
This system has a constant velocity, and there is an equilibrium because the tension in the cable, which is pulling up the object, is equal to the weight force, i.e., mg. Where M is a mass, and g is the acceleration caused by gravity, which is pulling down the object.
The Formula of Tension.
T = Mg
Tension word becomes from a Latin word meaning “to stretch.” Testing part of the force, Like one type of pull force. All physical objects that are in contact may exert forces on each other.
This contact forces different names based on these types of objects in contact. Where one of the objects exerting the force happens to be a rope, string, chain, or cable we call the force tensions
is it possible to put negative and positive charge at same time at electroscope leaves?
Answer:
No
Explanation:
If a positively charged object is brought near a negatively charged electroscope, it will attract some of the excess electrons up the stem and out of the leaves, causing the leaves to come slightly together
According to Newton's Law of Gravity, if two objects were to move twice as far apart, the force of gravity between them would be...
The force of gravity between them given the data from the question, would decrease by a factor of 4
Newton's law of gravityF = GM₁M₂ / r²
Where
F is the force G is the gravitational constant M₁ and M₂ are the masses of the objectsr is the distance apart Data obtained from the question Initial distance apart (r₁) = rInitial force (F₁) = FFinal distance apart (r₂) = 2rFinal force (F₂) =? How to determine the final forceF = GM₁M₂ / r²
Cross multiply
Fr² = GM₁M₂
GM₁M₂ = constant
F₁r₁² = F₂r₂²
With the above formula, we can obtain the final force as follow:
F₁r₁² = F₂r₂²
F × r² = F₂ × (2r)²
Fr² = F₂ × 4r²
Divide both side by 4r²
F₂ = Fr² / 4r²
F₂ = F / 4
Thus, we can conclude that the final force will decrease by a factor of 4
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A 160 kg cart has a momentum of 870 kg m/s. What is the velocity of the cart?
Answer: 5.44 m/s
Explanation:
Given:
Mass of cart: 160 kg
Momentum of cart: 870 kg•m/s
[tex]$$Momentum $|\rho|=m \times v$$$\begin{aligned}&870 \ kg\cdot m/s=160 \mathrm{~kg} \times v \\&v=5.44 \mathrm{~m} / \mathrm{s}\end{aligned}$$[/tex]
Answer:
The momentum is defined as :
P=mv
Where m is the mass and v is the velocity. In this case we know the mass is 160 kg and the momentum is 870 kg plugging in this equation above and solving for the velocity we have
870=160V
V=870÷160
V=5.44
Therefore, the velocity of the cart is 5.44 m/s.
If you pull a permanent magnet rapidly away from a tank circuit, what is likely to happen in that circuit?.
Answer:
attract the magnetic ratio engine light of rock level
You throw a 0.5 kg ball with a force of 10 N. What is the acceleration of the ball?
Answer:
20m/s^2
Explanation:
F=ma, therefore 10N = 0.5kg * a. Solve for a.
Which of the following processes is more easily observable for light with a short wavelength?
help please.
Answer:
Option B
Explanation:
Option B
Answer is PHOTOELECTRIC EFFECT
what would happen in a capacitor if the dielectric was not made out of an insulator
[tex]
\mathbb \blue{Answer }[/tex]
[tex]Introducing \: \: a \: dielectric \: \: into \: \\ a \: \: capacitor \: \: decreases \: \: \\ the \: \: electric \: \: field, \: \: \\ which \: \: decreases \: \: the \: \: \\ voltage, \: \: \ which \: \: increases \: \: the \: \: \\ capacitance. \: \: A \: capacitor \: \: with \: a \: \\ dielectric \: \: stores \: the \: \\ same \: \: \ charge \: \: as \: one \: \\ without \: \: a \: dielectric, \: but \: at \: \\ a \: \: lower \: \: voltage. \: \: \\ Therefore \: \: a \: \: capacitor \: \: with \: \: a \: \\ dielectric \: \: in \: \: it \: \\ is \: \: more \: \: effective \: [/tex]
[tex]\mathbb \blue{ I \: hope \: it's \: helpful \: \: for \: you }[/tex]
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Which of the four numbered galaxies have ongoing star formation?.
The image here is not found here but star formation is characterized by clouds of dust where stars are born.
What is star formation?Star formation is a physical phenomenon where molecular clouds in space need to collapse to generate stars.
Stellar evolution is a process that initiates when a star is formed and ends when it dies (formation of a red giant).
Stars can be generated inside clouds of dust which are dispersed in different types of galaxies in the universe.
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Question 20 I need help ASAP!!
Answer:
1.) Gas = Are the particles moving quickly in a radom pattern?
2.) Plasma = Are the particles electrically charged?
3.) Solid = Are the particles vibrating in a fixed position?
4.) Liquid = Are the particles sliding past each other?
Hope this helps!
In a circuit, when the electrical resistance increases, the current _______ because it is _______ for the electrons to flow
In a circuit, when the electrical resistance increases, the current _______ because it is _______ for the electrons to flow.
[tex] \\ [/tex]
Answer:In a circuit, when the electrical resistance increases, the current decreases because it is blocking for the electrons to flow.
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Starting from rest, an object accelerates on a straight level surface at the rate of 2 m/s for 10 s. 9. What is the speed of the object at the end of 10 s? (A)5 m/s (B) 10 m/s (C) 20 m/s (D) 30 m/s (E) 40 m/s
Answer:
C
Explanation:
a = v-u / t
a×t = v (u= 0 therefore is ignored)
2m/s² × 10s = v
v= 20m/s
Light of wavelength 630 nm (630 x 10-9 m) is used to produce a double slit diffraction pattern where the third order image is 0.10 m from the central image using a diffraction grating constant of 4.9 x 10-5 m. How far is the screen from the slits? SHOW ALL WORK
For Light of wavelength 630 nm (630 x 10-9 m) is used to produce a double slit diffraction pattern where the third order image is 0.10 m the distance of the screen from the slits is mathematically given as
D = 26m
How far is the screen from the slits?
Generally, the equation for the small-angle approximation is mathematically given as
x = n(Landa)D/d
therefore,
D = 0.10x4.9 x 10-5/(3x630 x 10-9)
D = 26m
In conclusion, the distance of the screen from the slits is
D = 26m
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If new evidence is discovered that a theory does not accommodateoptions:
the theory is disproved and thrown out
the theory then becomes a law
the theory is generally modified in light of this new evidence
the theory can not change so it stays the same
Answer:
The theory is generally modified in light of this new evidence.
Can electromagnetic waves travel in a vacuum?
Yes
Or
No
Answer:
Yes
Explanation:
Yes because Electromagnetic waves differ from mechanical waves in that they do not require a medium to propagate. This means that electromagnetic waves can travel not only through air and solid materials, but also through the vacuum of space.
Marcus plucks at an outstretched coil and observes the following wave motion. what is the motion of the particles in this kind of wave? a hand holds the left end of a set of waves. the wave has longer and shorter spaces between successive waves as it spreads to the right. a label wave motion is above the series of waves and an arrow next to the label points right. the particles will move up and down over large areas. the particles will move up and down over small areas. the particles will move side to side over small areas. the particles will move side to side over large areas.
The motion of the particles in this kind of wave will be option C that is The particles will move side to side over small areas.
What is a wave?A wave can be described as a disturbance that travels through a medium from one location to another location.
When Marcus plucks an outstretched coil, the coli sets into wave like motion that is oscillates to and fro. The particles of the medium do not move along the wave but just vibrate sideways about a fixed position.
The particles would move side to side over very small areas. Such type of wave is known as a mechanical wave. A Sound wave is a mechanical wave.
The particles vibrate in the direction of the motion of the wave. The wave carries forward the energy.
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Answer:
C is the correct answer. :)
Explanation:
True or False : If a car drives on a road for a nonzero amount of time, then its average velocity must be nonzero.
Answer:
Your answer would be:
B.) False
If a car drives on a road for a nonzero amount of time, then its average velocity must be nonzero.
If a car drives for a nonzero amount of time, then its average acceleration must be nonzero.
Explanation:
Have a great rest of your day
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An electric appliance is connected by wires to a 240-volt source of voltage. If the combined resistance of the appliance and wires is 12 ohms, how much current is flowing through the circuit?
Apply ohms law
V=IR240=12II=240/12I=20AAnswer :-
Current is 20 Ampere .Explanation :-
As per the provided information in the given question, we have been given that the Potential Difference is 240 Volt's . Resistance is given as 12 Ohm's . And, we have been asked to calculate the Current .
For calculating the Current , we will use the Formula :-
[tex] \bigstar \: \: \: \boxed{ \sf{ \: Current \: = \: \dfrac{Voltage}{Resistance} \: }} \\ [/tex]
Therefore , by Substituting the given values in the above Formula :-
[tex] \Longrightarrow \: \: \: \sf { Current \: = \: \dfrac{Voltage}{Resistance} } \\ [/tex]
[tex] \Longrightarrow \: \: \: \sf { Current \: = \: \dfrac{ \: 240 \: }{12} } \\ [/tex]
[tex] \Longrightarrow \: \: \textbf {\textsf { Current \: = \: 20 }} \\ [/tex]
Hence :-
Current = 20 Ampere .[tex] \underline {\rule {180pt}{4pt}} [/tex]
Additional Information :-
[tex] \Longrightarrow \: \: \: \sf {Voltage \: = \: Current \: \times \: Resistance} [/tex]
[tex] \Longrightarrow \: \: \: \sf {Current \: = \: \dfrac {Voltage}{Resistance} } [/tex]
[tex] \Longrightarrow \: \: \: \sf {Resistance \: = \: \dfrac {Voltage}{Current} } [/tex]
A light bulb has a resistance of 360 . What is the current in the bulb when it has a potential difference of 120 V across it?
0.33 A
3 A
480 A
43,200 A
Answer:
333 mAmps .33 A
Explanation:
v = ir
v/r = i
120 v / 360 ohm = .3333 A
Answer:
A). 0.33A
Explanation:
Continental air masses usually contain less moisture because they...
...originate over water.
...originate over ice.
...move from water onto land.
...originate over land.
brainliest for correct answer
Answer:
I believe its either the 3rd or 4th one
Explanation:
I'm not sure if these are correct sorry if this is a false or unhelpful anwser
Write your own real-world scenario where the Pythagorean Theorem can be applied to find a missing piece. You may choose to write a problem that is two- or three-dimensional in nature. Be sure that you will be able to draw a diagram of your scenario.
Write out your problem and submit it for Part 1. Be sure to end your scenario with a question
Answer:
hey
Explanation:
Displacement covered by the man calculated by using Pythagoras theorem is 10 km.
What is Pythagoras Theorem ?Pythagoras theorem states that, for a right-angled triangle, the square of the hypotenuse side is equal to the sum of squares of the altitude and base sides.
Here,
The Pythagoras Theorem can be written as,
c² = b² + a²
where c is the hypotenuse, b is the base and a is the altitude of the triangle.
An example of application of the Pythagoras theorem is,
A man started walking from his home and covered a distance of 8 km towards the east and then turned right and walked a distance of 6 km towards the south, what is his displacement now from his starting point ?
A line drawn from his current position and his initial point represents the displacement covered by the man.
Let the starting point be A, then he walks to the point B and then he turns right and walks upto the point C.
Drawing a figure including all the data, we get a right angled triangle, ABC. So,
The base of the triangle, BC = 6 km
Altitude of the triangle, AB = 8 km
The displacement of the man = hypotenuse of the triangle
d = AC
According to Pythagoras Theorem,
AC² = BC² + AB²
AC² = 6² + 8² = 100
AC = √100
Therefore, displacement, d = AC = 10 km.
Hence,
Displacement covered by the man calculated by using Pythagoras theorem is 10 km.
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Attaching the image file here.
. A marble sphere with a diameter of 1/4 inch is fully immersed in the oil of density 0.961 g/cm3 . Calculate the buoyant force exerted on the marble sphere by the oil.
Answer:
See below ( was it REALLY 1/4 INCH??)
Explanation:
Calculate the volume of the sphere
v = 4/3 pi r^3
this times the density of the oil will give g displacement
then f = ma
4/3 pi (.25 in * 2.54 cm/inch) ^3 * .961 = 1.0307 gm
1.0307 gm is .0010307 kg
f = ma = .0010307 * 9.8 = .0101 N
What does sound travel through?
Answer:
Solids liquids and gases
Explanation:
sound will not travel in a vacuum
Mike is pushing a car up a ramp. What could Mike do to reduce the effort force he needs to use to push the car?
Answer:
He could use a really big pulley system or get in it and drive or call a tow truck.
Which of the following is true about the Sun?
A.
The Sun is the only star in the Solar System.
B.
The Sun is the only star in the Milky Way.
C.
The Sun is not a star.
D.
The Sun is the only star in the universe.
How does water form in the clouds? Explain how
When air rises in the atmosphere it gets cooler and is under less pressure. When air cools, it's not able to hold all of the water vapor it once was. Air also can't hold as much water when air pressure drops. The vapor becomes small water droplets or ice crystals and a cloud is formed.
I hope this helps you..