what is weight?write the formula of weight
Answer: The weight of an object is defined as the force of gravity on the object and may be calculated as the mass times the acceleration of gravity, w = mg.
Explanation:
Iodine-131 has a half-life of 8.0 minutes. how many half-lives will pass in 120 minutes?
By the half-life of radioactive, the Iodine-131 experienced 15 half-lives.
We need to know about the half-life of the radioactive elements to solve this problem. The radioactive element will decay over time and follow the equation
N = No(1/2)^(t/t'')
where N is the final quantity, No is the initial quantity, λ is the decaying constant, t is time and t'' is the half-life of a radioactive element.
From the question above, we know that
t'' = 8 min
t = 120 min
Calculate the remaining mass
N = No(1/2)^(t/t'')
N = No(1/2)^(120/8)
N = No / 32768
As we know that half-lives is (No / (2^n)), Hence
N = No / 32768
N = No / 2^(²log(32768))
N = No / 2¹⁵
Hence, the Iodine-131 experienced 15 half-lives.
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Momentum describes *
O How much force is needed to change an object's motion
O How much velocity changes in a given amount of time
The tendency of an object to resist a change in motion
O The balanced forces on a falling object with a constant speed
Answer:
How much velocity changes in a given amount of time
Light with a frequency of 7. 30 x 1014 hz lies in the violet region of the visible spectrum. What is the wavelength of this frequency of light?.
According to electromagnetic waves, the wavelength of light is 410.96 nm.
We need to know about electromagnetic waves to solve this problem. Electromagnetic waves can propagate without media. The speed of electromagnetic in vacuum media is equal to the speed of light. Hence, the wavelength and frequency can be determined as
c = λ . f
where c is the speed of light (3 x 10⁸ m/s), λ is wavelength and f is frequency.
From the question above, we know that
f = 7.3 x 10¹⁴ Hz
By substituting the given parameter, we can calculate the frequency of microwaves
c = λ . f
λ = c / f
λ = 3 x 10⁸ / 7.3 x 10¹⁴
λ = 4.1096 x 10¯⁷ m
λ = 410.96 x 10¯⁹ m
λ = 410.96 nm
Hence, the wavelength of the light is 410.96 nm.
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Acceleration due to gravity on Mars is -3.7 m/s2. If you throw a Martian rock upwards with a velocity of 21.1 m/s, how long will it take to land back in your hand, at the same height from which it was thrown?
Answer:
5.7 seconds
Explanation:
1. We know that :
acceleration = change in velocity / time
2. We have been given the following :
acceleration = - 3.7 m/s^2
initial velocity = 21.1 m/s
final velocity = 0 (at the rock's max greatest height its velocity is 0)
time = ?
3. Subsitute the values + rearrange for t :
-3.7 = 0 - 21.1/t
t = 0-21.1/-3.7
t = -21.1/-3.7
t = 5.7 seconds (1.d.p)
An atom emitted green color during flame test which is about 550 nm. what is the frequency of this light? .545 x10-15/s 3.5 x 10-8/s 5.5x 10-7/s 5.45x 1014/s
During the flame test, an atom emitting a green color with a wavelength of roughly 550 nm would have a frequency of 5.45 1014 Hertz.
What is wavelength?It may be explained in terms of the separation between any two identical succeeding locations on a wave, such as how the wavelength can be determined by calculating the separation between any two successive crests.
Speed of light = frequency of the green light ×wavelength of the light
3×10⁸ = 550×10⁻⁹ × frequency
frequency = 3×10⁸ / 550×10⁻⁹
= 5.45 ×10¹⁴ Hertz
Thus, the correct answer is option D.
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what is the slope method
Answer: The Slope method calculates the flowrate of material in each stream from the slope of the moving cumulative sum with respect to time.
Explanation: hope this helps!!!!
When using the high-low method, should you base the high and low observations on the dependent variable or on the cost driver?
Option B) cost driver
10-9 In a cost function, the dependent variable and the cost driver are the lines of causality. In the high-low strategy, picking the highest and lowest observations of the cost driver is therefore suitable.
When should the high low approach not be used?If the highest and lowest activity levels reflect the company’s general cost pattern, the high-low technique can be reasonably accurate. However, the high low technique will give false results if the two extreme activity levels are systematically different.
How does the high-low approach work?Find the activity with the highest cost and highest operational unit.
Add the highest activity to the variable cost per unit.
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What happens to the pressure of an ideal gas inside a container if the temperature increases from 25 oc to 100 oc but the volume and amount of gas remains constant? (0 oc = 273 k).
By ideal gas approximation, the pressure will rise until 1.25 times greater than the initial pressure.
We need to know about the ideal gas theory to solve this problem. The ideal gas is assumed that there is no interaction between particles in a gas. It can be determined by the equation
P . V = n . R . T
where P is pressure, V is volume, n is the number of moles gas, R is the ideal gas constant (8.31 J/mol.K) and T is temperature.
From the question above, we know that
T1 = 25 ⁰C = 298 K
T2 = 100 ⁰C = 373 K
Assume that P1 = P
When the initial and final temperature is the same, we can use the ratio of pressure and temperature as
P1 / T1 = P2 / T2
P / 298 = P2 / 373
P2 = 1.25 P
Hence, the pressure will rise until 1.25 times greater than the initial pressure.
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It takes 100 j of work to stretch a spring 1 m from its equilibrium position. how much work is needed to stretchit an additional 1 m?
By using Hooke's Law, the work done is 400 joule.
We need to know about Hooke's Law to solve this problem. Hooke's Law describes the force applied to spring (elastic materials) will proportional to spring constant and displacement under the elastic condition. It can be described as
F = k . x
where F is force, k is spring constant and x is displacement.
The potential energy of spring can be determined as
PE = 1/2 . k . x²
where PE is potential energy
From the question above, we know that
PE1 = 100 J
x1 = 1 m
x2 = x1 + 1 m = 2 m
Potential energy is proportional to squared displacement, the ratio of PE can be written as
PE1 / PE2 = x1² / x2²
100 / PE2 = 1² / 2²
PE2 = 400 joule
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A bicycle has a constant velocity of 10 m/s. a person starts from rest and runs to catch up to the bicycle in 30 s. what is the acceleration of the person?
The person running from rest that catch up the bicycle in 30 s has an acceleration of: 0.66 m/s²
The formulas and procedures we will use to solve this exercise are:
v = x/ta = 2 * [x - (vi * t)] / t²Where:
v= velocityx = distancet = timevi = initial velocitya = accelerationInformation about the problem:
v(bicycle)= 10 m/sx(bicycle) =? t = 30 svi(person)= 0 m/sa(person)=?Applying the velocity formula and clearing the distance we have:
v = x/t
x = v * t
x(bicycle) = 10 m/s * 30 s
x(bicycle) = 300 m
With the distance the bicycle has traveled in 30 s we can calculate the person's acceleration
Applying the acceleration formula we have:
a = 2 * [x - (vi * t)] / t²
a = 2 * [300 m - (0 m/s * 30 s)] / (30 s)²
a = 2 * [300 m - (0 m)] / 900 s²
a = 600 m - 0 m / 900 s²
a = 600 m / 900 s²
a = 0.66 m/s²
What is acceleration?It is a physical quantity that indicates the variation of velocity as a function of time, it is expressed in units of distance per time squared e.g.: m/sec2 ; km/h2
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Three seconds after a gun is fired, the person who fired the gun hears an echo. how far away (in m) was the wall that reflected the sound of the gunshot? assume the speed of sound is 343 m/s.
The faraway was that reflected the sound of gunshot is 510m.
A sort of energy created by vibrations is sound. The vibration of an object causes the molecules of the air around it to move. These molecules collide with molecules nearby, causing those molecules to vibrate as well. As a result, they collide with more surrounding air molecules. Divide the sound's speed by the amount of time needed to hear the echo to determine how far the surface is. 1020 m/s equals 340 m/s divided by 3 s.
1020/3= 340 m/s
The distance should be divided by 2, though, as the sound is reflected. Received upto
510m that is
1020/2 = 510m
In order to evaluate the exposure to gunfire sound, the peak sound pressure level (SPL), spreading of the pressure wave, and other physical features of the impulse noise from firearms were researched in real-world shooting scenarios
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A rectangular lake has a width of 6.0 x 10^3 m and a length of 1.2 x 10^4 m. What is the area of the lake in scientific notation
Considering the defintion of area of a rectangle and multiplication in scientific notation, the area of the lake is 7.2×10⁷ m².
Definition of areaArea is the measure of the region or surface enclosed by a geometric figure.
Area of a rectangleA rectangle is a flat geometric figure with four sides, of which two sides that are opposite parallel to each other have the same length and the remaining two have another length.
The area of a rectangle is calculated from the two different sides (a and b). It is the product of the two contiguous sides of the rectangle:
Area of a rectangle= a×b
where a and b are the measures of the two sides.
Area of the lakeIn this case, you know that a rectangular lake has:
a width of 6.0×10³ m.a length of 1.2×10⁴ m.Then, the area of the lake can be calculated as:
Area of the lake= 6.0×10³ m× 1.2×10⁴ m
To multiply numbers in scientific notation, you multiply the numbers that are not powers of 10 and add the exponents that are powers of ten. In this case:
Area of the lake= (6.0× 1.2)×10³⁺⁴ m²
Area of the lake= 7.2×10⁷ m²
Finally, the area of the lake is 7.2×10⁷ m².
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A measure of the number of links between one object and another object in a relationship is called the _______.
A measure of the number of links between one object and another object in a relationship is called the cardinality.
The number of cardinal (fundamental) members of a set is referred to as cardinality. A non-negative integer can have a limited or infinite degree of cardinality. For instance, the number of people living in the United States has a cardinality of about 270,000,000, whereas the number of integers has an unbounded cardinality.
Think about set A. If A only contains a limited number of elements, then A's cardinality is equal to A's element count. For instance, |A|=5 if A=2,4,6,8,10.
The empty set has a cardinality of 0, which is zero. When we write #=0, it means either "the cardinality of the empty set is zero" or "the empty set has no elements."
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The north american and european continents are moving apart at a rate of about 3 cm/y. at this rate how long in years will it take them to drift 484 km farther apart than they are at present?
1.6133 long will take it to drift than that at present.
Explanation:We use V = S/T
Where v = velocity
S= distance
T= time
We can rework this to T=S/V
Given that 3cm/y converts into m
1m = 0.01 *3
3m/y
1km = 1000m
484000 m
Now, T=S/V
T = 484000/0.03
T = 16133333.33 x [tex]10^{-7}[/tex]
T = 1.6133
What is the rate that North America and Europe are moving apart?
about 3 cm per year
SSM Due to continental drift, the North American and European continents are drifting apart at an average speed of about 3 cm per year.
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Psychologists only focus on how people think and feel.
Truth or false
A bicyclist accelerates at a constant rate from a standstill to 15 km/hr in 72 sec. a) how fast is the bicyclist traveling after 55 sec? b) how far has the bicyclist traveled after 72 sec?
A cyclist who accelerates steadily from a stop to 15 km/hr in 72 seconds would reach 4.167 meters per second after 55 seconds.
What is Velocity?The total displacement covered by any object per unit of time is known as velocity.
As given in the problem a bicyclist accelerates at a constant rate from a standstill to 15 km/hr in 72 sec.
15 kilometers / hour = 15×1000 /3600
=4.167 meters / seconds
v = u + at
4.167 = 0 +a*72
a =4.167/72
a = 0.05787 meters /second²
Speed after 55 seconds = 0.05787*55
=3.18285 meters/ seconds
Distance after 72 seconds,
s = ut + 0.5at²
=0 + 0.5× 0.05787×72²
=150 meters
Thus, the bicyclist would have traveled 150 meters after 72 seconds.
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Indicate how many of each type of molecular orbital exist in acetone. for each type of molecular orbital, enter an integer (0, 1, 2, etc.) with no decimal places.
There are 10 bonding orbitals
10 antibonding orbitals
2 nonbonding orbitals
Each of the lone pairs on the oxygen is contained in a nonbonding molecular orbital.
What kinds of molecular orbitals does acetone contain?In acetone, there are ten antibonding orbitals.
What percentage of molecular orbitals have a N value of two?
The two 2s orbitals and all three 2p orbitals are the atomic orbitals with a n value of 2.
Eight molecular orbitals, of which half are bonding and the other half are antibonding, are created when these four orbitals from one atom interact with these four orbitals from another atom.
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What is the symbol, atomic number, # of protons, # of electrons, atomic mass, rounded atomic mass, # of neutrons (show work), and period of: helium
The symbol of the element helium is He, its proton number is 2, its atomic mass is 4, its neutron number is 2 and finally; helium belong to period 1 of the periodic table.
However, helium is a noble gas, meaning it has a stable octet electronic configuration ( having 8 valence electrons)
According to the periodic table, helium belong group 0 of the periodic table which is the 8th group. It belongs to period 1
Chemical elementsA chemical element refers a chemical substance which cannot be split into simpler units by chemical ordinary means.
Elements in the periodic table are generally categorized as metals, nonmetals and metalloids.
In addition, an atom is the smallest part of element which can take part in a chemical reaction.
Some examples of elements are as follows including their symbols
Hydrogen, HHelium, HeLithium, LiBeryllium, BeBoron, BCarbon, CNitrogen, NOxygen, OFluorine, FNeon, NeSodium, Na Magnesium, MgAluminum, AlSilicon, SIPhosphorus, PSulphur, SChlorine, ClArgon, ArPotassium, KCalcium, CaSo therefore, the symbol of the element helium is He, its proton number is 2, its atomic mass is 4, its neutron number is 2 and finally; helium belong to period 1 of the periodic table.
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A cart of mass 20kg is sitting on the floor, you push it and it has an acceleration of 3 m/s2, how much force did you apply to it?
Answer:
60N
Explanation:
Fnet=m.a
Fnet=(20)(3)
Fnet=60N
A jumpy squirrel is trying to cross the street. Its velocity vvv as a function of time ttt is given in the graph below where rightwards is the positive velocity direction.
A set of black coordinate axes are given with the vertical axis labeled "v (m/s)" and the horizontal axes labeled "t (s)". A curve that relates v to t is shown in blue. It begins with a straight line of endpoints (0,0) and (1,5). This first line is connected to a second line with endpoints (1,5) and (3,-5). This second line is then connected to a third line of endpoints (3,-5) and (6,-5).
A set of black coordinate axes are given with the vertical axis labeled "v (m/s)" and the horizontal axes labeled "t (s)". A curve that relates v to t is shown in blue. It begins with a straight line of endpoints (0,0) and (1,5). This first line is connected to a second line with endpoints (1,5) and (3,-5). This second line is then connected to a third line of endpoints (3,-5) and (6,-5).
What is the squirrel's displacement \Delta xΔxdelta, x from t=1\,\text st=1st, equals, 1, start text, s, end text to 2\,\text s2s2, start text, s, the answer is 2.5 I solved it
Answer: 2.5
Explanation: cause it is
A triangle has two sides of length 10 cm and 14 cm. what can you say about the length of the third side?
A side of any triangle is less than the sum of the other two sides so the third side must be less than 24cm.
What is a triangle?A triangle is a 3-sided shape that is occasionally referred to as a triangle. There are three sides and three angles in every triangle, some of which may be the same.
The sum of all three angles inside a triangle will be 180° and the area of a triangle is given as (1/2) × base × height.
There are many types of triangles such that right-angle triangles, equilateral triangles, and much more.
In any triangle, the sum of two sides is always greater than the third side.
If the third side is equal to the sum of two sides then it will be a straight line rather than a triangle.
It means 10 + 14 > third side
24 cm > third side
Hence "A side of any triangle is less than the sum of the other two sides so the third side must be less than 24cm".
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What is the km of the enzyme for the substrate a? b) what is the value of v0 when [a] = 43?
The km of the enzyme for the substrate a is determined as 5000mM, and the value of V0 would be calculated as 0.682nM/minute as per the calculations done.
Why are Km values high or low?The relationship between KM and the enzyme’s affinity for its substrate is inverse.
Low enzyme substrate affinity is correlated with high levels of KM (it takes more substrate to get to Vmax). An enzyme with a low KM value has a strong substrate affinity.
What is Vmax, and why is it important?Vmax is the reaction’s maximum rate at the specified enzyme concentration.
The reaction’s speed increases when the concentration of the substrate rises, but after a while, when the enzyme becomes saturated with the substrate, the reaction speed does not continue to rise.
CalculationAs seen after 10000mM concentration of substrate velocity of enzyme becomes constant attain maximum velocity i.e., Vmax
Therefore, we have Km = Vmax/2
= 10000/2 = 5000mM
Then by applying the equation
V = Vmax[S/S+km]
V = 80[43/43+5000]
= 0.682nM/minute
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How does the amount of potential energy change if a hill is taller.
For how many seconds would a force of 8.00 n have to act on a 2.00 kg mass in order to change its velocity from 2 m/s to 7 m/s?
By using uniform motion, the time taken is 1.25 seconds.
We need to know about the uniform motion to solve this problem. The uniform motion is an object's motion under acceleration. It should follow the rule
vt = vo + a . t
vt² = vo² + 2a . s
s = vo . t + 1/2 . a . t²
where vt is final velocity, vo is initial velocity, a is acceleration, t is time and s is displacement.
From the question above, we know that
F = 8 N
m = 2 kg
vo = 2 m/s
vt = 7 m/s
Find the acceleration by second Newton's Law
F = m.a
8 = 2 . a
a = 4 m/s²
Find the time taken
vt = vo + a . t
7 = 2 + 4t
4t = 5
t = 1.25 seconds
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A blimp is approximated by a prolate spheroid 90 m long and 30 m in diameter. estimate the weight of gas within the blimp for (a) helium at 1.1 atm and (b) air at 1.0 atm.'
(a) Let's start by calculating the helium's weight. We'll apply the well-known weight equation:
W helium =m helium ⋅g
where m helium is the mass of the helium and g is the gravity.
=>W helium =ρ helium ⋅V⋅g
putting the values we get
ρ helium =0.183 kg/ m^3
Therefore, W helilum =76.2 kN
(b) The weight of the air will also be determined in the same manner:
W air =ρ air ⋅V⋅g
=> ρ air =1.205 kg/ m^3
Therefore after substituting the values we get,
W air = 501.35 kN
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What is the percent uncertainty in the measurement 5.8 +_ 0.25 m
The percent uncertainty in the measurement ( 5.8 ± 0.25 m) is 4.31%.
By definition, a percentage is a value out of a possible 100. The measurement's absolute error is multiplied by the measurement's value to determine the percentage. The result is then multiplied by 100.
Percent uncertainty:
Uncertainty is stated as a percentage, or fractional uncertainty is fractional uncertainty multiplied by 100.
Consider the measurement,
5.8 ± 0.25 m
Let 5.8 ± 0.25 m = x ± Δx
Then,
x = 5.8 and Δx = 0.25
The percent uncertainty will be:
% uncertainty = [ Δx / x ] × 100
% uncertainty = [ (0.25 m) / ( 5.8 m) ] × 100
% uncertainty = ( 0.04310344827 ) × 100
% uncertainty = 4.31 %
Therefore, the percent uncertainty of the measurement 5.8 ± 0.25 m is 4.31 %.
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A+2.0-microf+capacitor+that+is+initially+uncharged+is+charged+through+a+50-kilo-ohm+resistor.+how+long+does+it+take+for+the+capacitor+to+reach+90%+of+its+full+charge?
A 2.0 micr of capacitor that is initially uncharged is charged through a 50-kilo ohm resistor, it will take a time of 2.3sec to charge 90%.
What is the formula for a capacitor’s charging?C or Q may be equal. Thus, the charge needed to raise a conductor’s potential through unity is numerically equivalent to the conductor’s capacitance.
What occurs as the capacitor charges?There is no current flowing across the circuit when a capacitor is fully charged. This is true because the voltage source’s potential difference across the capacitor is also equal.
In other words, the charging current reaches zero and the capacitor voltage equals the source voltage.
The charge present on the capacitor is changing in time as follows:
q(t)=qo (1−e−tRC)
Here,
• qo is provided as the maximum charge on the capacitor.
• R=50000 Ω is the resistor value.
• C=2⋅10−6 F is the capacitance of the capacitor.
Solving for the time, we obtain:
t=−RCln(1−qq0)
Here,
• q=0.9qo is the charge on the capacitor at the moment t;
The Computation yields:
t=−5⋅10^4Ω⋅2⋅10^-6 F⋅ln(1−0.9q0)
≈0.23 s
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how do you know if you have a base unit
Answer:
Доброе утро, ответ 5+5="4
Explanation:
A copper wire is 40.93 cm long and weighs 1.141 g. the density of copper is 8.933 g/cm3 . what is the radius of the wire in millimeters?
The radius of the wire in millimeters is 0.33 mm.
The length of the copper wire is l.
l = 40.93 cm
The mass of the copper wire is m.
m = 1.141 g
The density of the copper is p.
p = 8.933 g/cm³
The volume of the copper of the wire is,
[tex]Density = \frac{ Mass}{ Volume}[/tex]
[tex] Volume = \frac{Mass}{ Density}[/tex]
[tex]v = \frac{m}{p} [/tex]
[tex]v = \frac{1.141}{8.933}[/tex]
= 0.15 m³
The volume of the copper wire is 0.15 m³.
The radius of the copper wire is,
The volume of the wire = π × (radius)² × height
v = π × r² × l
[tex]r ^{2} = \frac{v}{\pi \times l} [/tex]
[tex] r ^{2} = \frac{7 \times 0.15}{22 \times 40.933} [/tex]
r = 0.033 cm
The radius of the copper wire is 0.033 cm.
The radius of the copper wire in millimeters is,
1 cm = 10 mm
0.033 cm = 0.33 mm
Therefore, the radius of the wire in millimeters is 0.33 mm.
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