Answer:
40.35 da / 8.7 da/half-life = 5 half lives
The sample has gone thru 5 half lives
2^5 = 32 only 1/32 of the original amount is left
25 g * 32 = 800 g present in the original sample
Identify the amplitude of the wave using the picture below.
Answer:
Line 2 is the amplitude
Explanation:
The amplitude is the distance from equilibrium to the top of the maximum or minimum of the wave.
You walk 6 meters east followed by 4 meters west in 4 seconds. What is your velocity
Answer:
16 velocity
Explanation:
A radar transmits a signal towards an aeroplane. The velocity of the signal is 3.0 x 10^8 m/s. After 0.0036 s, the radar detects the reflected signal. What is the distance of the aeroplane from the radar?
The distance of the airplane from the radar will be 1.08×10⁶ m. Distance can refer to a physical length.
What is distance?Distance is a numerical representation of the distance between two objects or locations.
The distance of the airplane from the radar is found by the formula;
Distance = velocity × time
Distance = 3.0 x 10^8 m/s× 0.0036 s,
Distance = 1.08×10⁶ m.
Hence, the distance of the airplane from the radar will be 1.08×10⁶ m.
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Which building material would provide the best surface for viewing a reflection?
Answer:
it is A fffgfhdshhsdsggsgssggsdggedgdgegggeeegeegegehe
I need help on this asap!!!!
The left side of the armature in an electric motor is pushed down. when the current changes direction, how is the motion of the armature affected? it is pulled up on the left side. it is pulled up on the right side. it is pulled toward the commutator. it is pushed away from the commutator.
Answer:
It is pulled up on the left side. took the test
Explanation:
Hey yall, can you help with this? First-person to answer gets brainiest + an additional 17 pts.
Answer:
(a) 217 Ra (b) 29 P
84 16
Explanation
(a) 221 Rn ---------------> 4 He + 217 Ra
86 2 84
the mass number is reduced by 4 while the atomic number is reduced by 2 since an alpha particle is emitted
(b) 29 P ------------------> 0 e + 29 P
15 -1 16
the mass number remains the same while the atomic number is reduced by -1 since a beta particle is emitted
physics 6
physics geniuses where r u need help!!!
------------------------
pls also check other questions!
Answer:
165.5
Explanation:
vrms × root 2= v max
Hence we get v maximum =165.5 V
help please!
will give brainliest to the correct answer.
question; the work one by friction force to stop a car of mass 1000 kg moves with velocity 72km/h is ..........
a) 72 x 10³ J
b) 2 x 10⁴ J
c) 2 x 10⁵ J
d) 4 x 10⁵ J
an explanation for future reference would be appreciated^^
Answer:
b)
Explanation:
The work done by friction is equal to the all of the initial Kinetic Energy lost when the vehicle comes to a complete stop
KE = 1/2 m v^2
72 km / hr = 20 m/s
KE = 1/2 * 1000 kg * (20 m/s)^2 = 200 000 J = 2 x 10^4 J
A proton moves with a speed of 0. 985c. (a) calculate its rest energy
The rest energy of the proton will be 938 MeV. The rest energy is related to the rest mass of the proton.
What is rest energy?The rest energy is the rest mass times the square of the speed of light of a particle at rest in an inertial frame of reference.
The rest energy is found as;
[tex]\rm E_R= mC^2\\\\ E_R=(1.67 \times 10^{-27})\times 3 \times 10^8)^2\\\\ E_R= 9.375 \times 10^8 / eV[/tex]
Convert into the mega electron volt;
[tex]\rm E_R= 938 \ MeV[/tex]
Hence, the rest energy of the proton will be 938 MeV
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A passenger jet in the air increases its speed. Does the downward force of air on the top of the wings increase or decrease? Does the net lifting force of the air on the wings increase or decrease? Explain your answer
The downward force of air on top of the wings decreases. The net lifting force of the air on the wings increase. A passenger jet in the air increases its speed.
If air resistance acts on a falling object will all of its potential energy be converted into kinetic energy?
Answer:
No, some energy will be dissipated energy due to work of air resistance.
A surfacing whale in an aquarium produces water wave crests having an amplitude of 1.2 meters every 0.40 second. If the water wave travels at 4.5 meters per second, the wavelength of the wave is
The wavelength of the water wave having a amplitude of 1.2 meters every 0.4 seconds is 1.8 m .
What is wavelength?Wavelength is the total distance traveled by a wave in one cycle.
To calculate the wavelength of the wave, we use the formula connecting
speed, wavelength, and Period.
Formula:
v = λ/T........... Equation 1Where:
v = Velocity of the waveλ = WavelengthT = PeriodMake λ the subject of the equation
λ = vT............ Equation 2From the question,
Given:
v = 4.5 m/sT = 0.40 sSubstitute these values into equation 2
λ = (4.5×0.4)λ = 1.8 mHence, The wavelength of the water wave having a amplitude of 1.2 meters every 0.4 seconds is 1.8 m .
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Two beams of coherent light are shining on the same piece of white paper. with respect to the crests and troughs of such waves, darkness will occur on the paper where
Answer:
"where crests and troughs have their maxima at the same time"
Crests and troughs are 180 deg out of phase and when they have their maxima at the same time and place, their net contribution will be zero"
Sort the images based on whether there’s a force of attraction or repulsion between the magnets show.
Answer:
look at the explanation
Explanation:
the first one, 4th one and 6th one will go into repulsion and the others will go into attractive (hope this helps and Goodluck on any other questions)
Name one energy source that is used to make sure that we can provide energy consistently,even though demand varies during the day
Answer:
Water power, eg tidal and hydroelectricity , is reliable and predictable because of the Moon causing the tides and rainfall filling reservoirs. They can also be used to supply additional demand.
Explanation:
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Place the elements c, n, and o in order of increasing ionization energy
The increasing order for the first ionization energy has been:
< C < N < O.
What is ionization energy?The first ionization energy has been the amount of energy required for removing the electron from the gaseous state. The molecules that have small structures and available valence electrons, the ionization energy has been decreased.
In the periodic table, on moving from left to right there has been an increase in the size of the atom, as well as the valence electrons. The increase in size results in more attraction by the nucleus resulting in increased first ionization energy.
The increasing order for the first ionization energy has been:
C < N < O.
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To increase the potential energy of a barbell, work is done on the weightlifter. by the barbell. on the barbell. none of the above
The potential energy of a barbell is increased when it is lifted by the weight lifter and work is done on the barbell.
What is the meaning of energy?Energy is the ability to do work. We must note that the weightlifter does work in a gravitational field.
Hence, the potential energy of a barbell is increased when it is lifted by the weight lifter and work is done on the barbell.
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Describe earth’s orbit around the sun. Describe the orbits of the other planets.
Answer:
An ellipse with the Sun at one of the foci of the ellipse
Explanation:
Planets have elliptical orbits
During which season is the sun highest in the sky?.
Answer: summer
Explanation:
In June, when the Earth is tilted towards Sun and the Sun reaches its highest point in the sky, that is called the summer solsticeand is the longest day of the year.
What is a electric charge
Answer:
Positive and Negative, commonly carried by charge carriers protons and electrons. Examples of the types of charges are subatomic particles or the particles of matter: Protons are positively charged. Electrons are negatively charged.
Explanation: ;)
electrostatic charge and symbolized q, is a characteristic of a unit of matter that expresses the extent to which it has more or fewer electrons than protons.
You really have a thing for screaming outside. So on a day where the speed of sound is 343 m/s you go outside and scream at a wall. It takes 0.5 s for you to hear your echo. How far away is the wall that you screamed at?
2. FAt=p (remember p=mv). A 2.5Jg baseball moving at 8.5m/s to the left is slowed by a tipped
catch to 7.5m/s to the right in 0.25 seconds, what was the force of the tipped catch?
The force of the tripped catch exerted on the 2.5 Kg ball moving at 8.5 m/s to the Left is 160 N
Data obtained from the question Initial velocity (u) = 8.5 m/sFinal velocity (v) = 7.5 m/sTime (t) = 5 ms = 0.25 sMass (m) = 2.5 KgForce (F) = ?How to determine the forceThe force exerted on the ball can be obtained as follow:
F = m(v + u) / t
F = [2.5(7.5 + 8.5)]/ 0.25
F = 40 / 0.25
F = 160 N
Thus, the force exerted on the ball is 160 N
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If I am driving on the highway and see a pig on the road and go from 60m/s to 20 m/s in 5 s. What is my acceleration?
Explanation:
Acceleration = final velocity - initial velocity
______________________
time taken
= 20 m/s - 60m/s
________________
5seconds
= -40 m/s
_______
5 seconds
= -8m/s^2
What type of meter is connected in
parallel with a resistor in a circuit, and why?
• A. An ammeter, to measure potential difference
• B. A voltmeter, to measure potential difference
• C. A voltmeter, to measure current
O. D. An ammeter, to measure current
Answer / Explanation:
B
Potential difference is measured using a device called a voltmeter . Just like ammeters, some types have a pointer on a dial, but most have a digital display. However, unlike an ammeter, you must connect the voltmeter in parallel to measure the potential difference across a component in a circuit.
This is a sever snowstrom with high winds and low visibility
Answer:
blizzard
Explanation:
A blizzard is a severe snowstorm characterized by strong sustained winds and low visibility
Now, provide 2 things that has high mass and low mass stars have in common.
Answer:
Those common things which they both have are:i) They both start off with fusing hydrogen into helium.and ii) They both generate their energy by the process called nuclear fusion.((hope it is useful for u all))
Which section from the article BEST explains why wavelength and frequency are dependent on each other? (A) "Amplitude And Height" (B) "Wavelength And Cycle" (C) "Frequency And Period" (D) "Speed"
A 1.5 x 105 kg train is accelerating. The force applied to the train is 7.0 x 104 N. What is the train’s acceleration?
Answer:
See below
Explanation:
F = ma
7 X 10^4 = 1.05 x 10^5 * a
a = .666 = 2/3 m/s^2
2. A box filled with books has a mass of 15.0 kg. It is pushed across the floor with a constant force of 60.0 N. If the frictional force by the floor on the box is 15.0 N, what is the acceleration of the box?
Answer:
[tex]3 m/s^{2}[/tex]
Explanation:
ΣF=ma
The two forces at play are the force applied and the force due to friction. As they are opposing forces set the direction being pushed as the positive in the x direction. the equation you come out with is 60 - 15=(15)A (we know mass to be 15kg). Solve for 3 m/s^2.