Answer:
5.01×10⁴ J.
Explanation:
Applying,
q = Cm....................... Equation 1
Where q = amount of heat needed to melt the ice, m = mass of the ice, C = specific latent heat of ice.
From the question,
Given: m = 150 g = (150/1000) kg = 0.15 kg, C = 3.34×10⁵ J/kg
Substitute these values into equation 1
q = (0.15×3.34×10⁵)
q = 0.501×10⁵ J
q = 5.01×10⁴ J.
An object of mass 45 kg is observed to accelerate at the rate of 6 m/s2. Calculate the force required to produce this acceleration
help its due in 10 minutes lol
Red light of wavelength 633 nm from a helium-neon laser passes through a slit 0.370 mm wide. The diffraction pattern is observed on a screen 3.70 m away. Define the width of a bright fringe as the distance between the minima on either side. You may want to review (Page) . For related problem-solving tips and strategies, you may want to view a Video Tutor Solution of Single-slit diffraction. Part A What is the width of the central bright fringe
Answer:
Δx = 6.33 x 10⁻³ m = 6.33 mm
Explanation:
We can use the Young's Double Slit Experiment Formula here:
[tex]\Delta x = \frac{\lambda L}{d}\\\\[/tex]
where,
Δx = distance between consecutive dark fringes = width of central bright fringe = ?
λ = wavelength of light = 633 nm = 6.33 x 10⁻⁷ m
L = distance between screen and slit = 3.7 m
d = slit width = 0.37 mm = 3.7 x 10⁻⁴ m
Therefore,
[tex]\Delta x = \frac{(6.33\ x\ 10^{-7}\ m)(3.7\ m)}{3.7\ x \ 10^{-4}\ m}[/tex]
Δx = 6.33 x 10⁻³ m = 6.33 mm
Man-made climate change is an example
of...
In the Zeeman effect, the energy levels of hydrogen are split by a magnetic field. Each state with a different value of mlml has a different energy. The differences in energy between adjacent values of mlml are all equal. The Zeeman effect is observed as a splitting in the spectral lines of hydrogen in the presence of a magnetic field. What is the greatest number of lines that a single spectral line can be split into by a magnetic field
Answer:
the Zeeman effect without spin is three lines
Explanation:
The Zeeman effect is the result of the interaction of the magnetic field with the orbital angular momentum of the electrons, if we do not take the spin into account it is called the Normal Zeeman effect.
Therefore we only take into account the orbital moments (m_l) of the transition, from the selection rules of the refreshed harmonics, only the transition with
[tex]\Delta m_l[/tex] = 0, ± 1
ΔE [tex]\DeltaE = \mu_B \ \Delta m_l \ B[/tex]
Let's analyze for the case of the Hydrogen atom
For a transition between levels n = 1 and n = 2 the values of m_l are n_f = 1 m_l = 0 and for n₀ = 2 m_l = 0, 1
so we only have two lines.
For transition n_f = 2 and n₀ = 3
n_f = 2 m_l = 0, 1
n₀ = 3 m_l = -1, 0, 1
There are only two lines plus the central line, so there are three spectral lines
for n_f = 3 and n_o = 4
n_f = 3 ml = -1, 0, 1
n₀= 4 ml = -2, -1, 0, 1, 2
Only transitions with Δm_l = ±1 are allowed, so there are only two transitions plus the central transition (Δm_l = 0), so there are only 3 spectral lines.
In summary, due to the selection rule of spherical harmonics, the greatest number of lines in the Zeeman effect without spin is three lines.
The period of a sound wave coming from an instrument is 2 seconds. What 1 point
is the frequency of the sound? (f = 1/T) *
5 Hz
50 Hz
ОО
0.5 Hz
Answer:
b
Explanation:
An astronaut is a distance L from her spaceship, and is at rest with respect to the ship, when she discovers that her tether has broken. She tosses a wrench with a speed Vw in the opposite direction of the ship to propel herself back to the ship. The astronaut has mass MA, and the wrench has mass Mw.
Required:
a. Draw a sketch, showing the subsequent motion of the astronaut and the wrench.
b. What is the initial momentum (before toss) of the astronaut plus wrench system? What is the final momentum?
c. Use conservation of momentum to solve for the speed of the astronaut VA, relative to the ship, in terms of MA, Mw and Vw.
d. How long does it take her to reach the ship in terms of L, MA, Mw and Vw?
e. How far has the wrench traveled from its original position when the astronaut reaches the ship? Express your answer in terms of L, MA and Mw.
Answer:
B) I₀ = I_f= 0, C) vₐ = [tex]\frac{m_w}{m_a} \ v_w[/tex] , D) t = [tex]\frac{m_a}{m_w} \ \frac{L}{v_w}[/tex]
Explanation:
A) in the attachment you can see a diagram of the movement of the key and the astronaut that is in the opposite direction to each other.
B) Momentum equals the change in momentum in the system
I = ∫ F dt = Δp
since the astronaut has not thrown the key, the force is zero, so the initial impulse is zero
I₀ = 0
The final impulse of the two is still zero, since it is a vector quantity, subtracting the impulse of the two gives zero, since it is an isolated system
I_f = 0
C) We define the system formed by the astronaut and the key, for which the forces during the separation are internal and the moment is conserved
initial instant.
p₀ = 0
final instant
p_f = [tex]m_a v_a - m_w v_w[/tex]
We used the subscript “a” for the astronaut and the subscript “w” for the key
the moment is preserved
po = p_f
0 = mₐ vₐ - m_w v_w
vₐ = [tex]\frac{m_w}{m_a} \ v_w[/tex]
D) as the astronaut goes at constant speed we can use the uniform motion relationships
vₐ = x / t
t = x / vₐ
t = [tex]\frac{m_a}{m_w} \ \frac{L}{v_w}[/tex]
(121 m/s, or 43
4. The pilot of an airplane, which has been diving at a speed of
540 km/h, pulls out of the dive at constant speed.
(a) What is the minimum radius of the plane's circular path in
order that the acceleration of the pilot at the lowest point
will not exceed 7 g?
(b) What force is applied on an 80 kg pilot by the plane seat at
the lowest point of the pull-out? (328 m, 6.3 X 10N)
Answer:
(a) r = 328 m
(b) F = 6271.8 N
Explanation:
speed, v = 540 km/h = 150 m/s
Acceleration, a = 7 g
(a) Let the radius is r.
[tex]a =\frac{v^{2}}{r}\\7\times 9.8 = \frac{150\times 150}{r}\\r = 328 m[/tex]
(b) The force on 80 kg pilot at the lowest point is
[tex]F =m \times g + m\frac{v^{2}}{r}\\F = 80\times9.8 +80\times \frac{150\times 150}{328}\\\\F =784 + 5487.8 = 6271.8 N[/tex]
Compare two vectors that are of the same magnitude but are in opposite direction. Write 4 points to do this.
Answer:
jsuxgbqnqozygxnwkisgx
Explanation:
jducgsjqkzhxbbekxochdbjsixgwjdk
1. Amplitude is the maximum distance that the particles in a medium _____
2. A Wavelenght of a wave is the distance from ____
3. As the frequency of a wave increases, the wavelengths ___
4. The frequency of a wave is the number of ___
5. Changing the frequency of waves also changes ___
Answer:T or F: Mechanical waves need a medium through which to transport energy. ... T or F: Wave A has a greater frequency than wave B, but the amplitude of the two waves is the ... past the raft increases, you also find that the distance between each crest ___. ... For a given wave, the frequency doubles, the wavelength is ____.
Explanation:
PLEASE HELP What are some ways to increase momentum?
Electroconvulsive therapy would be done under the
supervision of a counseling psychologist, where high level
of electric shock would be admistered.
Select one:
True
False
Answer:
the answer of this question is true
1-Autotrophic plants are also called
2-The ____ guards the opening and closing of stomata
3-_______ is an example of a nitrogen fixing bacterium
4______ plants has the biggest and the heaviest flower
5-a tissue called _____bcarries water and minerals from the root to the root to the leaves of plants
Answer:
1. Producers
2. cell (guards)
3. Rhizobium
4. Rafflesia Arnoldii
5. Xylem
what is a transformer
Answer:
An electrical box that regulates all the electricity for an area.
Which of the following is a category of mechanical wave?
O A. Transverse
B. Frictional
C. Parallel
D. Perpendicular
Answer:
a
because the mechanical wave is when it goes over and over again
Answer:
The answer is a like i said 3hrs ago i dont know if this guy copied me tbh
Explanation:
Which of the following best defines climate? PLEASE HELP!!
Explain your answer. What parts of your hypothesis were strong correct? What parts were weak?
Use the data from the table and the Punnett Square in your explanation.
This question is from quizlet.
So better check this question!
Light of intensity I0 passes through 4 ideal polarizing sheets. Unpolarized light enters the 1st sheet that has a horizontal transmission axis. Light continues to the 2nd sheet that has its transmission axis at 25 degrees with respect to the 1st sheet, then to the 3rd sheet that has its transmission axis at 47 degrees with respect to the 1st sheet then to the 4th sheet that has its transmission axis at 10 degrees with respect to the 3d sheet. The intensity of the emerging light as percentage of I0 is close to:
Answer:
34.24 %
Explanation:
Since I₀ is the intensity of the un-polarized light, the intensity I₁ of the light polarized by the 1st sheet is (by the one-half rule) I₁ = I₀/2.
The intensity of polarized light I from a polarized source I' is I = I'cos²Ф where Ф is the angle between the direction of I' and I. Since the second sheet has its transmission axis at 25° with respect °o the 1st sheet, the intensity of light I₂ from the second sheet is I₂ = I₁cos²25°.
Also, the 3rd sheet has its transmission axis 47° with respect to the 1st sheet. So, the angle between the transmission axis of the 2nd sheet and 3rd sheet is 47° - 25° = 22°. So, the intensity I₃ from the 3rd sheet is I₃ = I₂cos²22°
Finally, the 4th sheet has its transmission axis 10° with respect to the 3rd sheet. So, the intensity I₄ from the 4th sheet is I₄ = I₃cos²10°.
So, I₄ = I₃cos²10°
I₄ = I₂cos²22°cos²10°
I₄ = I₁cos²25°cos²22°cos²10°
I₄ = (I₀/2)cos²25°cos²22°cos²10°
I₄/I₀ = cos²25°cos²22°cos²10°/2
I₄/I₀ = (cos25°cos22°cos10°)²/2
I₄/I₀ = (0.9063 × 0.9272 × 0.9848)²/2
I₄/I₀ = 0.8275²/2
I₄/I₀ = 0.6848/2
I₄/I₀ = 0.3424
So, as a percentage,
I₄/I₀ × 100% = 0.3424 × 100% = 34.24 %
The length of the slope of a mountain is 2780 m, and it makes
its base?
angle of 14.1° with the horizontal. What is the height of the mountain, relative to
Additional Materials
Reading
Answer:
677 m
Explanation:
Using the definition of the sine of an angle, we can write
sin 14.1 = (height of mountain) / (slope length of mountain)
sin 14.1 = H / (2780 m) ---> H = (2780 m) x sin 14.1
= 677 m
The height of the mountain is 677.21 m
The given parameters;
length of the slope, L = 2780 m
angle of inclination, Ф = 14.1°
let the height of the mountain, = h
A simple sketch of the problem is given below;
↓P
↓
↓ h
↓ 14.1°
↓------------------------------------------------Q
A straight line joining PQ is the hypotenuse of the right triangle.
The height of the right triangle is calculated as follows;
[tex]sin(14.1) = \frac{h}{PQ} \\\\\h = PQ \times sin(14.1)\\\\h = 2780 \times sin(14.1)\\\\h = 677.21 \ m[/tex]
Thus, the height of the mountain is 677.21 m
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The tuner begins by muting the right and center A4 strings. He then strikes the A4 key, and tunes the left A4 string to be exactly the same frequency as a 440 Hz tuning fork. Next, he unmutes the center string, and plays the A4 key. Now he hears both the left and center A4 strings vibrating at the same time. He can hear that the center string is slightly flat, and he can hear beats between the two strings with a beat frequency of 0.40 Hz. What is the frequency of the center string
Answer:
f= 440.4 Hz or f= 439.6 Hz
Explanation:
In this exercise we have two waves with slightly different frequencies, the A4 chord with f = 440 Hz and the beating with the central chord fbeats = 0.40 Hz, let's use the relation
f_{beat} = | f - f₀ |
f = fo + - f _{beat}
f = 440 + 0.4 = 440.4 Hz
f = 440-0.4 = 439.6 Hz
An 800 kg charging bull rams through a wooden fence. It was travelling at
5 m/s, now it's travelling at 3 m/s. How much impulse did the bull
experience by smashing the fence?
Answer:
J = 1600 kg-m/s
Explanation:
Given that,
The mass of charging bull rams, m = 800 kg
Initial speed, u = 5 m/s
Final speed, v = 3 m/s
We need to find the impulse the bull experience by smashing the fence. Let it is J. We know that, impulse is equal to the change in momentum such that,
J = m(v-u)
Put all the values,
J = 800(3-5)
= 800(-2)
= -1600 kg-m/s
Hence, the magnitude of impulse is equal to 1600 kg-m/s.
True or false. When a girl walks the action of pushing and the equal amd opposite reaction is being projected forward
This is true I think
It applies to Newton's Laws
it's true because it's a part of newtons law
You are playing in a volley ball game Your team has 12 and the other team has 18.
How many points does your team needs to win?
How many points does the other team needs to win?
Answer:
you need 7 points and the other team just needs to stop you from scoring
Explanation:
63. Which of the following types of validity is estab-
‘lished by demonstrating that there is a correlation
between scores on a test and later academic
performance?
(A) Content
(B) Predictive
(C) Face
(D) Concurrent
(E) Test-retest
Help I beg someone please help please
Answer:
Content
Explanation:
The type of validity that is established by demonstrating a correlation between scores on a test and later academic performance is known as CONTENT VALIDITY
The above statement is true because Content validity is a form of validity testing used to assess whether the outcome of a test is a precise measure of the fundamental aspect or domain of the construct.
Hence, to provide a credible result, content validity ensures it covers all suitable parts of the content or topic it attempts to measure.
Rays of light radiating from Sun are
radiations
Explanation:
All of the energy from the Sun that reaches the Earth arrives as solar radiation, part of a large collection of energy called the electromagnetic radiation spectrum. Solar radiation includes visible light, ultraviolet light, infrared, radio waves, X-rays, and gamma rays. Radiation is one way to transfer heat.
Answer:
All of the energy from the Sun that reaches the Earth arrives as solar radiation, part of a large collection of energy called the electromagnetic radiation spectrum. Solar radiation includes visible light, ultraviolet light, infrared, radio waves, X-rays, and gamma rays. Radiation is one way to transfer heat
Two band members are marching toward each other beginning from opposite end zone goal lines (100 yards apart). One band member is playing a picolo and marching at 5 ft/s and the other is playing a sousaphone and marching at 1 ft/s. At what yard line do they meet?
Answer:
17
Explanation:
answer is 16.6666 which is equal to 17
Do all the cells look the same in a filament? If there is a difference, describe
how they are different.
Answer:
All cells in filamentous algae look the same except for the spores. Explanation:
find the total electric field along the line of two of the two charges shown in figure at the point midway between them
Two-fifths of a number is 23.2, find
the number.
A. 116.0
B. 58.0
C. 46.4
D. 29.0
E. 14.5
11
Considering the definition of an equation and the way to solve it, the correct answer is option B.: the number is 58.
Definition of equationAn equation is an algebraic equality in which letters (unknowns) appear with unknown value in addition to certain known data.
An equation has:
The members, which are each of the expressions that appear on both sides of the equal sign.The terms, which are the addends that form the members of an equation.The solution of an equation is to find the value of the unknown or unknowns that verify the equality. To solve an equation, keep in mind:
When a value that is adding, when passing to the other member of the equation, it will subtract.If a value you are subtracting goes to the other side of the equation by adding.When a value you are dividing goes to another side of the equation, it will multiply whatever is on the other side.If a value is multiplying it passes to the other side of the equation, it will pass by dividing everything on the other side.This caseBeing "x" the number you want to find and knowing that two-fifths of a number is 23.2, the equation in this case is:
2/5x= 23.2
Solving:
x= 23.2 ÷ 2/5
x= 58
Finally, the number is 58.
Learn more about equations:
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#SPJ1
if a car travels 125 miles in 2.5 hours, what was the cars average speed over the 2.5 hours?
Answer:
50 miles per hour
Explanation:
125/2.5 which equals to 50
Answer:
50 miles per hour
Explanation:
125 divided by 2.5 = 50