Explanation:
George Washington (1789–1797)
John Adams (1797–1801)
Thomas Jefferson (1801–1809)
James Madison (1809–1817)
James Monroe (1817–1825)
John Quincy Adams (1825–1829)
Andrew Jackson (1829–1837)
Martin Van Buren (1837–1841)
William Henry Harrison (1841)
John Tyler (1841–1845)
James K. Polk (1845–1849)
Zachary Taylor (1849–1850)
Millard Fillmore (1850–1853)
Franklin Pierce (1853–1857)
James Buchanan (1857–1861)
Abraham Lincoln (1861–1865)
.
George Washington, the 1st President of the United States
John Adams, the 2nd President of the United States
Thomas Jefferson, the 3rd President of the United States
James Madison, the 4th President of the United States
James Monroe, the 5th President of the United States
John Quincy Adams, the 6th President of the United States
Andrew Jackson, the 7th President of the United States
Martin Van Buren, the 8th President of the United States
William Henry Harrison, the 9th President of the United States
John Tyler, the 10th President of the United States
James K. Polk, the 11th President of the United States
Zachary Taylor THE 12TH PRESIDENT OF THE UNITED STATES
Millard Fillmore, the 13th President of the United States
Franklin Pierce, the 14th President of the United States
James Buchanan, the 15th President of the United States
Abraham Lincoln, the 16th President of the United States
Five identical quintuplets leave earth when they reach the age of 21, in the year 2121. Each quintuplet goes on a spaceship journey that takes T years, as measured by a clock in each spaceship. During the journey they travel at a constant speed v, as measured on earth, except during the relatively short acceleration phases of their journey.
Part A:
Rank these quintuplets on the basis of the year on earth when they return from their journey.
Rank from largest to smallest. To rank items as equivalent, overlap them.
A: T=20years, v=0.4c
B: T= 5years, v=0.2c
C: T=10years, v=0.8c
D: T=10years, v=0.4c
E: T=20years, v=0.8c
Part B:
Rank these quintuplets on the basis of their age when they return from their journey.
Rank from largest to smallest. To rank items as equivalent, overlap them.
A: T=20years, v=0.4c
B: T= 5years, v=0.2c
C: T=10years, v=0.8c
D: T=10years, v=0.4c
E: T=20years, v=0.8c
Answer:
Explanation:
This is a problem based on time dilation , a theory given by Albert Einstein .
The formula of time dilation is as follows .
t₁ = [tex]\frac{t}{\sqrt{1-\frac{v^2}{c^2} } }[/tex]
t is time measured on the earth and t₁ is time measured by man on ship .
A ) Given t = 20 years , t₁ = ? v = .4c
[tex]\frac{20}{\sqrt{1-\frac{.16c^2}{c^2} } }[/tex]
=1.09 x 20
t₁= 21.82 years
B ) Given t = 5 years , t₁ = ? v = .2c
[tex]\frac{5}{\sqrt{1-\frac{.04c^2}{c^2} } }[/tex]
=1.02 x 5
t₁= 5.1 years
C ) Given t = 10 years , t₁ = ? v = .8c
[tex]\frac{10}{\sqrt{1-\frac{.64c^2}{c^2} } }[/tex]
=1.67 x 10
t₁= 16.7 years
D ) Given t = 10 years , t₁ = ? v = .4c
[tex]\frac{10}{\sqrt{1-\frac{.16c^2}{c^2} } }[/tex]
=1.09 x 10
t₁= 10.9 years
E ) Given t = 20 years , t₁ = ? v = .8c
[tex]\frac{20}{\sqrt{1-\frac{.64c^2}{c^2} } }[/tex]
=1.67 x 20
t₁= 33.4 years
write the formula of mechanical advantage
Answer:
the formula of mechanical advantage is
MA = load / effort
VR = effort distance / load distance
hope it is helpful to you
PLEASE HELP ME WITH THOSE TWO QUESTIONS
A 122 Ohm, 232 Ohm, and 500 Ohm resistors are all connected in series with a 12 V battery. What is the current flowing through them?
A 100 Ohm, 200 Ohm, and 300 Ohm resistor are all connected in series to a 12 V battery. What is the potential difference drop across the 100 Ohm resistor?
Answer:
(a) 0.014 A
(b) 2 V
Explanation:
(a) Applying
V = IR'...................... Equation 1
Where V = Voltge, I = current, R = total resistance.
make I the subject of the equation
I = V/R'................... Equation 2
From the question,
Given: V = 12 V, R' = (122+232+500) ohms (The resistance are connected in series) = 854 ohms
Substitute these values into equation 2
I = 12/854
I = 0.014 A
(b) Applying
V' = V(R₁)/(R₁+R₂+R₃)...................... Equation 3
Where V' = Voltage across the 100 ohms resistor.
From the question,
V = 12V, R₁ = 100 ohm, R₂ = 200 ohm, R₃ = 300 ohm.
Substitute these values into equation 3
V' = (12×100)/(100+200+300)
V' = 1200/600
V' = 2 V
Question 6 of 10
The mass number of a nucleus decreases during which nuclear reactions?
A. Nuclear fusion and alpha decay
B. Nuclear fission and beta decay (electron emission)
C. Nuclear fusion and beta decay (positron emission)
D. Nuclear fission and alpha decay
Answer:
D. Nuclear Fission and alpha decay
Any is 160 cm tall and stands 50 cm in front of a plane mirror. The image of Amy is ?
Answer:
Option A. 160 cm tall and 100 cm in front of Amy
Explanation:
To know the the correct answer to the question, we must recognise that the image formed by plane mirror is:
I. Same size as the object.
II. Same distance as the object from the mirror.
III. Laterally inverted.
IV. Virtual
With the above information, we obtained the answer to the question as follow:
Object height = 160 m
Thus,
Image height = 160 m
Distance of object from mirror = 50 cm
Therefore,
Distance of image from the mirror = 50 cm
Distance between the object and image = 50 + 50 = 100 cm
Thus, option A gives the correct answer to the question because the image of Amy is 160 cm tall and 100 cm in front of her.
Please help with all three questions
Answer:
The correct answer is D C A
Future space stations could create an artificial gravity by rotating. Consider a cylindrical space station that rotates with a period of 28 seconds about its axis. Astronauts walk on the inside surface of the space station, and they experience an Earth-like gravitational acceleration of 9.8 m/s2. What is the diameter of the space station?
510m
145m
660m
390m
Answer:
P = 2 pi R / v period of space station
F / m = v^2 / R centripetal force per unit of mass
So F / m = 4 pi^2 R^2 / (P^2 * R) = 4 pi^2 R / P^2
Also, F / m = 9.8 m/s^2 earth's gravitational attraction
So 9.8 = 4 pi^2 R / P^2 or R = 9.8 P^2 / 4 * pi^2) = 195 m
Or D = 2 R = 390 m the diameter required
Which quantity does not change when there is an increase in temperature?
Answer:
But Mass of solids does not depend upon the temperature because it is matter contained in the solids.
Explanation:
The mass is the quantity which does not change when there is an increase in temperature.
What is mass?A tangible body's mass is the amount of matter it possesses. It's also a metric of inertial, or the resistance to velocity when a net force is exerted.
The quantity does not change when there is an increase in temperature is mass because it is matter that makes up solids, their mass is unaffected by temperature.
Thus, the mass is the quantity which does not change when there is an increase in temperature.
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Light of wavelength 520 nm passes through two narrow slits 0.66 mm apart. The screen is 1.60 m away. A second source of unknown wavelength produces its second-order fringe 1.23 mm closer to the central maximum than the 520 nm light. What is the wavelength of the unknown light
Answer:
λ = 266 nm
Explanation:
In this case, we need to determine first the separation of the second fringe from the central maximum. We can determine that with the following expression:
d sinθ = mλ (1)
However, as the slits are very narrow, we can assume that sin θ ≈ θ and so θ = x/l
Replacing this in (1) we have:
d(x/l) = mλ
and solving for x:
x = mλl / d (2)
Where:
x: separation of the 2nd fringe from the central maximum
m: order of the fringe
λ: wavelength of light
l: distance of the screen
d: distance between the slits
All the units must be in meters (m), so we can convert the units first or during the resolution. In this case, we'll do it in the resolution. Replacing the given data, we have:
x = 2 * (520 nm * 1m/10⁻⁹ nm) * 1.6 m / (0.66 mm * 1m/1000 mm)
x = 0.00252 m or just 2.52 mm
With this value, we can compute or determine the separation of the 2nd order fringe of the unknown light in the central maximum:
x₂ = 2.52 - 1.23 = 1.29 mm or 0.00129 m
Now, using (2) we can solve for λ:
λ = dx / ml (3)
Replacing we have:
λ = (0.00129 * 0.0066) / (2 * 1.6)
λ = 2.66x10⁻⁷ m or simply 266 nmHope this helps
which of the following changes will increase the frequency of an oscillating pendulum?
a. an increase in the mass of the pendulum.
b. an increase in the initial height of release.
c. an increase in the length of the rope.
d. more than one of the above
e. none of the above
explain your answer in your own words.
NO LINKS.
Answer:
b (i think)
Explanation:
What are political obstacles keeping wind turbine from being used?
Explanation:
Turbines might cause noise and aesthetic pollution.
Although wind power plants have relatively little impact on the environment compared to conventional power plants, concern exists over the noise produced by the turbine blades and visual impacts to the landscape.
The inflexibility, variability, and relative unpredictability of wind power as a means for electricity production, are the most obvious barriers to an easy integration and widespread application of wind power." Thus, the uncertainty of the wind requires a system that is always available to replace all the electrical output created by the wind turbine system. In other words, it is too expensive to have wind turbines lying around that don't do anything.
A block attached to an ideal spring oscillates horizontally with a frequency of 4.0 Hz and amplitude of
0.55 m. The spring constant is 75N/M
What is the mass of the block?
Answer:
.12kg
Explanation:
khan academy
How does energy change from kinetic to potential?
Answer:
A: An object has potential energy (stored energy) when it is not in motion. Once a force has been applied or it begins to move the potential energy changes to kinetic energy (energy of motion).
Explanation:
The amount of force needed to cause an object to accelerate depends upon
A.
the object's mass and the net force acting upon it.
B.
the object's volume and the net force acting on it.
C.
the object's mass and volume.
D.
the object's speed and direction.
someone pls help
Answer:
A
Explanation:
I have read the information
Convert 0.0375 kg to g
Answer: 37.5 g
Explanation: you multiply 0.0375 by 1000 which equals 37.5
Answer:
0.0375 kilograms are equal to 37.5 grams
You throw a ball straight up. Compare the sign of the work done by gravity while the ball goes up with the sign of the work done by gravity while it goes down.
a. Work is + on the way up and + on the way down
b. Work is + on the way up and - on the way down
c. Work is - on the way up and + on the way down
d. Work is - on the way up and - on the way down
Answer:
c. Work is - on the way up and + on the way down
Explanation:
Work done is given as the product of the applied force and the displacement of the object.
Work done = F x d
Work done = mg x d
where;
g is acceleration due to gravity = 9.8 m/s²
When the ball goes up, it moves against the force of gravity which tends to pull every object downwards. Since the ball moves against gravity, the work done is negative.
Also, when the ball goes down, it moves in the direction of gravity which acts downwards. Since the ball moves in the same direction as gravity, the work done is positive.
The correct option is "C. Work is negative (-) on the way up and positive (+) on the way down"
The ratio of carbon 14 to nitrogen-14 in an artifact is 13. Given that the half-
life of carbon-14 is 5730 years, how old is the artifact?
A. 17,190 years
B. 22,920 years
C. 11,460 years
D. 5730 years
Answer:
The half-life of 14C is 5703 years.
Descriptions of the sky at various locations on Earth
An ant is crawling along a straight wire, which we shall call the x axis, from A to B to C to D (which overlaps A), as shown in the figure below. O is the origin. Suppose you take measurements and find that AB is 31 cm , BC is 12 cm , and AO is 7 cm .(Figure 1)
A. What is the ant’s position at point A?
B. What is the ant’s position at point B?
C. What is the ant’s position at point C?
D. What is the ant’s position at point D?
Answer:
Ants position at point A = -7 cm
Ants position at point B = 38 cm
Ants position at point C = 26 cm
Ants position at point D = -7 cm
Explanation:
In this question, we are dealing with displacement which is the change in position of an object.
Now, we are told the journey began from A to B and then from C to D.
Now, AB = 31 cm and AO = 7cm
But along AB, we have the origin O.
Since A is on the left hand side of the origin, it means it is negative. Thus, position A = -7cm
Then position B = 31 - (-7) = 31 + 7 = 38 cm
Since BC = 12cm, then position C = 38 - 12 = 26 cm
Position D is same as position A = -7cm
Two people are carrying a uniform 704.0 N log through the forest. Bubba is 2.2 m from one end of the log (x), and his partner is 0.9 m from the other end (y). The log is 6.2 m long (z). What weight is Bubba supporting
Answer:
F₁ = 499.61 N , this is the force that Bubba support
Explanation:
The trunk is in equilibrium with the two forces applied by man, let's use the equilibrium relation
let's set a reference frame at the extreme left and assume that the counterclockwise rotations are positive
Let's write the expression for the translational equilibrium
subscript 1 is for Bubba's mass and subscript 2 for his partner
F₁ + F₂ -W = 0
F₁ + F₂ = W
the expression for rotational equilibrium
∑ τ = 0
F₁ 2.2 + F₂ (6.2-0.9) - W 6.2/2 = 0
2.2 F1 + 5.3 F2 = 3.1 W
let's write our system of equations
F₁ + F₂ = W
2.2 F₁ + 5.3 F₂ = 3.1 W
we solve for F₁ in the first equation and substitute in the second
F₁ = W-F₂
2.2 (W- F₂) + 5.3 F₂ = 3.1 W
F₂ ( -2.2 +5.3) = W (3.1 - 2.2)
F₂ = 704 0.9 / 3.1
F₂ = 204.39 N
This is the force that the partner supports
we look for F1
F₁ = W-F₂
F₁ = 704 - 204.39
F₁ = 499.61 N
This is the force that Bubba support
what is acceleration?
Answer:
the rate of change of velocity per unit of time.
Answer:
accelerate is rate of chang of velocity
The hydrogen atom, changing from its first excited state to its lowest energy state, emits light with a wavelength of 122 nm. That is in the far ultraviolet. The sodium atom, which like hydrogen has one electron that gets excited outside a core of 10 other electrons, emits light at 589 nm making a similar transition from its first excited state to its lowest state. Which of these statements would be true about the sodium and hydrogen atoms and their spectra? THERE IS MORE THAN ONE CORRECT ANSWER
a. There would be other series of spectral lines ending on the first excited states of both atoms.
b. There would be a series of spectral lines in sodium with the longest wavelength one at 589 nm.
c. There would be a series of spectral lines in hydrogen with the longest wavelength one at 122 nm.
d. The hydrogen atom binds its electron more tightly than the sodium atom does, and would require more energy to remove its electron completely.
Answer:
c. There would be a series of spectral lines in hydrogen with the longest wavelength one at 122 nm.
d. The hydrogen atom binds its electron more tightly than the sodium atom does, and would require more energy to remove its electron completely.
Explanation:
The hydrogen atom which changes from the excited state to the lower ground state, it emits light having a wavelength of 122 m. And the sodium atom also gets excited and emits light at 589 nm when it moves from the 1st excited state to the lowest excited state.
Therefore, when the electrons jumps from the 1st excited state to the ground state, only one wavelength is observed as there is only one transition.
The hydrogen atom will bind the electron tightly but the sodium atom does not and would require more energy to remove the electron the electron completely as the binding energy is higher when the electron is closer to the nucleus.
True or false? When two objects interact, both force and motion are caused.
PLEASE HELP ME WITH THIS ONE QUESTION
A cylindrical copper wire has a resistance of 10 Ω across a 1-meter length. The resistivity of copper is 1.7 x 10^-8 Ω-m. What is the cross-sectional area of the wire?
The cross-sectional area of the cylindrical copper wire is 1.7 x 10⁻⁹ m².
What is meant by resistivity ?Resistivity is defined as the amount of electrical resistance of a conductor, per unit cross-sectional area and unit length.
Here,
Resistance of the wire, R = 10 Ω
Length of the wire, l = 1 m
Resistivity of the wire, ρ = 1.7 x 10⁻⁸ Ωm
The expression for the resistivity of a conductor is given as,
ρ = RA/l
where A is the cross-sectional area of the conductor.
Therefore, the area of cross-section of the copper wire,
A = ρl/R
A = 1.7 x 10⁻⁸ x 1/10
A = 1.7 x 10⁻⁹ m²
Hence,
The cross-sectional area of the cylindrical copper wire is 1.7 x 10⁻⁹ m².
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A 1800-kg Jeep travels along a straight 500-m portion of highway (from A to B) at a constant speed of 10 m/s. At B, the Jeep encounters an unbanked curve of radius 50 m. The Jeep follows the road from B to C traveling at a constant speed of 10 m/s while the direction of the Jeep changes from east to south. What is the magnitude of the acceleration of the Jeep as it travels from A to B
Answer:
a = 0 m/s²
Explanation:
From A to B the jeep travels in a straight line with a constant speed of 10 m/s. Acceleration is defined as the rate of change in velocity. In the current scenario, the velocity of the jeep remains constant. The direction of the jeep does not change as it travels in the straight path. Also, the magnitude of the velocity is constant at 10 m/s.
Therefore, there is no change in the velocity of the jeep from A to B. Hence, the will be no acceleration from A to B.
a = 0 m/s²
A piece of stone of mass 80 g is
dropped into a measuring cylinder
containing water. The water level
increases from 12 cm² to 37 cm
Calculate the density of the stone.
A. 32 g/cm
B. 3.2 g/cm
C. 320 g/cm
D. 3.20 g/cm
8
37+12
Answer:
this is how I know it though my answer is not in the choices
Explanation:
M=80g
V=37cm-12 cm
15cm
Density=mass/volume
80g/15cm3
5.33g/cm3
Electric field inside a charged rubber balloon is maximum or zero?
In the diagram shown below, the distance from the dotted line to Point A, or the distance from the dotted line to Point D is known as the
Answer:
The dotted line connecting two points is known as the distance traveled.
Explanation:
The distance traveled is a physical quantity that refers to the total displacement of a body. This distance is usually shown as a dotted line that connects two points in an image. In general, we can say that the distance traveled is calculated by adding all the distances that an element makes when leaving one point and reaching another point, which is its final position.
An example of this can be seen in the image shown below, where the red line represents the displacement of a body that left point A and arrived at point B. The blue dotted line represents the distance traveled and refers to the total displacement of that body, showing all the distances it covered while walking from point A to point B.
Which of the following statements correctly describe the various applications listed above?
a. None of these technologies use radio waves.
b. None of these technologies use lower-frequency microwaves.
c. None of these technologies use higher-frequency microwaves.
d. None of these technologies use infrared waves.
e. The radiation emitted by some wireless local area networks has the shortest wavelength of all the technologies listed above.
f. All these technologies emit waves with a wavelength in the range 0.10 to 10.0 cm.
g. All the technologies emit waves with a wavelength in the range 0.01 to 10.0 km.
Answer:
The answer is "c,d,e, and g".
Explanation:
The correct choices can be defined as follows:
Higher-frequency microwaves aren't used in any of these systems.Infrared waves aren't seen in each of these technologies.Its shortest wavelength of all of the technologies listed is the above radiation generated by certain wireless networks.These devices all produce waves of wavelengths ranging from 0.10 to 10.0 cm.What does the potential energy diagram of a chemical reaction tell you?
O A. Whether atoms are being created or destroyed
O B. Whether the reaction is endothermic or exothermic
C. Whether there are more reactants or products
D. Whether the law of conservation of matter is being obeyed
Answer:
B
Explanation:
I'm learning about this now actually and it can be a little confusing but it would be endothermic or exothermic. if endothermic the products have less energy than the reactants and if exothermic products have more energy than reactants