Photoelectrons are emitted from the surface of a metal when light shines on it. If the wavelength of the light is decreased
Answer:
what are your answer choices if you have any?
Explanation:
(my ask question thingy isnt working)
What two forces propel the acceleration of change in human societies today?
Answer:
Collective behavior and social movements
Explanation:
Social movements are a collective behavior but are organized efforts and goal driven. It can range from local to national and can even reach globally. Groups that are behind social movements usually want to either create or resist social, political, economic, or cultural change.
The use of fossil fuels such as coal, oil, natural gas, and technical advancements in the contemporary age is driving the acceleration of change in human cultures today.
What are fossil fuels?Fossil fuels are obtained beneath the earth's crust, which is formed due to buried plants and animals. The excessive heat under the earth crust heats the plants and animals.
The use of fossil fuels such as coal, oil, natural gas, and technical advancements in the contemporary age is driving the acceleration of change in human cultures today.
Hence, the use of fossil fuels such as coal, oil, and natural gas, and technical advancements are two forces that propel the acceleration of change in human societies today
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If an ocean wave passes a stationary point every 5 s and has a velocity of 10 m/s, what is the wavelength of the wave
Answer:
As Per Provided Information
Velocity of wave v is 10m/s
These ocean wave passes a stationary point every 5 s ( It's time period)
First we calculate the frequency of ocean wave .
Using Formulae
[tex] \blue{\boxed{\bf \: \nu = \cfrac{1}{v}}}[/tex]
here
v is the velocity of wave .
[tex]\sf\longrightarrow \nu \: = \cfrac{1}{10} \\ \\ \\ \sf\longrightarrow \nu \: = 0.1Hz[/tex]
Now calculating the wavelength of the wave .
Using Formulae
[tex] \boxed{ \bf \lambda = \cfrac{v}{ \nu}}[/tex]
Substituting the value and we obtain
[tex] \sf \longrightarrow \lambda \: = \cfrac{10}{0.1} \\ \\ \\ \sf \longrightarrow \lambda \: = \cancel\cfrac{10}{0.1} \\ \\ \\ \sf \longrightarrow \lambda \: =100m[/tex]
Therefore,
Wavelength of the wave is 100 metres.What best describes the motion of the medium particles in a longitudinal wave? The medium does not move. The medium moves in all directions. The medium vibrates as it moves in a circular path around the wave. The medium vibrates parallel to the direction of the wave.
In the motion of the medium particles in a longitudinal wave, the medium vibrates parallel to the direction of the wave.
What is a longitudinal wave?A longitudinal wave is a wave that is transversing along the length. When the displacement of medium and travel of wave is the same in that condition wave is known as the longitudinal wave.
It requires some medium to travel. A mechanical and sound wave is an example of a longitudinal wave.
Hence in the motion of the medium particles in a longitudinal wave, the medium vibrates parallel to the direction of the wave.
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Answer:
d the medium vibrates parallel to the direction of the wave.
Explanation:
Which force counteracts motion whenever two surfaces come into contact?.
Answer:
crush
Explanation:
because the body come into contact
When a thermometer is emersed in ice cold water, the Mercury thread is observed to rise before dropping steadily in the capillary tube. Explain
The term group polarization refers to the tendency for.
Polarization refers to the tendency for acquiring specific orientation by the oscillation.
What is polarization?Polarization is a property that specifies the geometrical orientation of the oscillations. In a transverse wave, the direction of the oscillation is perpendicular as compared to other that have parallel.
So we can conclude that Polarization refers to the tendency for acquiring specific orientation by the oscillation.
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Rectangular plate has a voltage of +180V and plate to the first plate) has a 'voltage of -5V. Determie another rectangular plate (parallel to between these two plates? The distance of the field strength at any point separation of the plates is finite, say 8.6mm.
For a Rectangular plate has a voltage of +180V and a 'voltage of -5V. , the second plate has the Electric field mathematically given as
E=21.5*10^3v/m
What is the field strength?Generally, the equation for the Electric field is mathematically given as
E=v/d
Where
v={180-(-5)}v
v=185v
Therefore
E=185/8.6*10^{-3}
E=21.5*10^3v/m
In conclusion, Electric field
E=21.5*10^3v/m
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The diagram above shows a ballistic pendulum. A 10 g bullet is fired into the suspended 2 kg block of wood and
remains embedded inside it (a perfectly inelastic collision). After the impact of the bullet, the block swings up to a
maximum height h. If the initial speed of the bullet was 35 m/s:
A.) What was the momentum of the bullet before the collision?
B.) What was the kinetic energy of the bullet before the collision?
C.) What was the velocity of the bullet-block system just after the collision?
D.) What was the total kinetic energy of the bullet-block system after the collision?
E.) What is the maximum possible potential energy of the bullet-block system when it reaches its maximum height?
F.) What is the maximum possible height of the bullet-block system?
The kinetic energy of the bullet-block system is equal to the potential energy of the bullet-block system when it reaches its maximum height.
Conservation of Linear momentumAccording to the principle of conservation of linear momentum, momentum before collsion is equal to momentum after collision. Let us now answer the questions individually.
1) The momentum of the bullet before collsion = (0.001 Kg * 35 m/s) = 0.35 Kgms-1
2) The kinetic energy of the bullet before collision = 0.5 * 0.001 * (35 m/s)^2 = 0.6125 J
3) Velocity after collsion is obtained from;
(0.001 Kg * 35 m/s) + (2 kg * 0 m/s) = (0.001 Kg + 2 kg) v
v = 0.35/2.001 =
v=0.1749 m/s
4) Total kinetic energy after collison = 0.5 * (0.001 Kg + 2 kg) * (0.1749 m/s)^2
= 0.031 J
5) The maximum possible potential energy of the bullet-block system when it reaches its maximum height = Total kinetic energy after collison = 0.031 J
6) The maximum possible height of the bullet-block system is obtained from;
PE = mgh
h = 0.031 J/(0.001 Kg + 2 kg) * 9.8 ms-2
h = 0.0015 m or 0.15 cm
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When does sound become damaging to the human ear?
If the body temperature of a person is recorded as 37°C, what is the person’s body temperature in K? Round your answer to the nearest whole number.If the body temperature of a person is recorded as 37°C, what is the person’s body temperature in K? Round your answer to the nearest whole number.
What parts are found in an electric generator? select 4 options. an armature a battery a permanent magnet an electromagnet brushes slip rings
The parts found in an electric generator for the conversion of electric energy into other forms of energy such as mechanical or chemical energy are an armature, a permanent magnet, an electromagnet brushes, and slip rings.
What is electric generator?
An electric generator is a device that converts motive power into electric power for use in an external circuit.
Parts of electric generators include the following;
an armaturea permanent magnetan electromagnet brushesslip ringsThese parts of electric generator helps in the generation of electricity or conversion of electric energy into mechanical energy or light energy or chemical energy.
Thus, the parts found in an electric generator for the conversion of electric energy into other forms of energy such as mechanical or chemical energy are an armature, a permanent magnet, an electromagnet brushes, and slip rings.
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Answer:
armature
permanent magnet
electromagnet
brushes
slip rings
Explanation:
edge 2022-2023
A car initially travels west with a kinetic energy of 10 J. Then it travels east at three times its original speed. What is its kinetic energy when it is traveling east
KE₁ = 1/2mv²
10 J = 1/2mv²
KE₂ = 1/2m(3v)²
KE₂ = 1/2mv².9
KE₂ = 10 . 9 = 90 J
Convert 95°F into degree centigrade.
35
Explanation:
95 =9/5*x +32
63=9/5x
9x=63*5
x=35
If the two blocks are touching, what will happen to the thermal energy in this system?
Explanation:
What are the integers between -4 and +4?
3. In the formula F = −kx , what does the minus sign indicate?
It indicates that the restoring force is in the direction of the displacement.
It indicates that the restoring force is in the direction opposite the displacement.
It indicates that mechanical energy in the system decreases when a system undergoes oscillation.
None of the above
Please show all of your work.
In the formula F = −kx , what does the minus sign indicate?
Solution: It indicates that the restoring force is in the direction opposite the displacement.
====================================================
k is the force constantF is the restoring force.negative sign represents the restoring force.x is the displacementAnswer:
It indicates that the restoring force is in the direction opposite the displacement.
Explanation:
I had an explanation but, my acc got deleted and yeah, uhm the explanation is dead now, I know this is correct though!
~Kandy~
hope this helped!
brainliest please!
A stationary siren on a firehouse is blaring at 81Hz. Assume the speed of sound to be 343m/s. What is the frequency perceived by a firefighter racing toward the station at 11km/h
For a stationary siren on a firehouse is blaring at 81Hz. Assume the speed of sound to be 343m/s, the frequency perceived is mathematically given as'
F=81.721Hz
What is the frequency perceived by a firefighter racing toward the station at 11km/h?Generally, the equation for the doppler effect is mathematically given as
[tex]F'=\frac{vs+v}{vs}*f[/tex]
Therefore
F=81(343+3.05556)/343
F=81.721Hz
In conclusion, the frequency is
F=81.721Hz
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a woman weighs 580 N . what is her mass?
Answer:
The mass of woman is 59.18 kg.Given data:Weight of women is, .An object on the surface has its weight such that it is determined by the force of gravity acting on the object. Mathematically, the weight of object is calculated by multiplying the gravitational acceleration with mass of object.Then,Here, m is the mass of woman and g is the gravitational acceleration.Solving as,Thus, the mass of woman is 59.18 kg.
Explanation:
59.18 kg
Hope this helps! :)
What is the period of a wave traveling with a speed of 20 m/s and the wavelength is 4.0 m?
Answer:
0.2s
Explanation:
wave formula
v=(lambda)f
20=(4)f
20÷4
=5Hz
1÷5
T=0.2s
The period of a wave travelling with a speed of 20 m/s and the wavelength is 4.0 m is 0.2 sec.
What is time period?
The length of time it takes a wave to complete one cycle is known as the wave's period. The frequency of the wave must be known in order to compute the wave period. The number of cycles a wave may complete in a period of time—typically one second—is its frequency.
wave formula
v = (lambda)f
20 = (4)f
20÷4
f = 5 Hz
T = 1/f
T = 1÷5
T = 0.2 sec
The period of a wave travelling with a speed of 20 m/s and the wavelength is 4.0 m is 0.2 sec.
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Enter an expression, in terms of defined quantities and g, for the force that the scale under left pillar shows
The expression, in terms of defined quantities and g is therefore Fu =((mg/2) +2 mp) g
What is a Scale?This can be defined as a balance or any of various other instruments or devices for weighing.
The expression in terms of defined quantities and g, for the force that the scale under left pillar shows that Fu =((mg/2) +2 mp) g .
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The expression, in terms of defined quantities and g, for the force that the scale under left pillar is (m(b)/2+2m(d))g.
What is the equilibrium state of a system?Equilibrium is the location of the system, in which the system be static does not change its position with respect to time.
The image of the uniform beam which has two pillar is attached below. In this pillar,
The length of the pillar is L and the mass is m(b)Pillars located at L/3 from either end.The system is in equilibrium.A duck is shown has the mass m(d).The expression, in terms of defined quantities and g, for the force that the scale under left pillar has to be find out.
In the equilibrium position torque in left pillar is zero,
[tex]\tau_{right} =0[/tex]
It can be written as,
[tex]F_L\dfrac{L}{3}=m_bg\dfrac{L}{6}+m_dg\dfrac{2L}{3}[/tex]
[tex]F_L=\left(\dfrac{m_b}{2}+2m_d\right)g[/tex]
Thus, the expression, in terms of defined quantities and g, for the force that the scale under left pillar is (m(b)/2+2m(d))g.
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Why a surface that always have a perpendicular is an equipotential
Which trait shared by dolphins and bats possibly lead to the evolution of echolocation in these two animal groups? the need to move quickly through dark environments the need to be able to send sound waves through the air the need to be able to send sound waves through the water the need to communicate with other species through echolocation.
A trait shared by dolphins and bats will be the need to move quickly through dark environments.
What is the evolution of echolocation?Our understanding of the evolution of echolocation in bats has shifted as a result of recent molecular phylogenies. These phylogenies imply that bats with advanced echolocation
According to one interpretation of these trees, laryngeal echolocation originated in the ancestor of all living bats. Echolocation may have been lost in Old World fruit bats
The vast adaptive radiation in echolocation call design is substantially controlled by ecology, demonstrating how environmental perceptual problems influence call design.
A trait shared by dolphins and bats that possibly led to the evolution of echolocation in these two animal groups will be the need to move quickly through dark environments.
Hence option A is correct.
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Answer:
D
Explanation:
a girl walks 2 meters north 4 meters west and 2 meters south her final displacement is:
List the elements mentioned from hydrogen to iron in the order of their fusing temperature.
Explanation:
H
Hydrogen
-259.14 -252.87 0.00008988 (gas, 273K)
2
He
Helium
-272.20 (under pressure) -268.934 0.0001785 (gas, 273K)
3
Li
Lithium
180.54 1347 0.534
4
Be
Beryllium
1278 2970 1.8477
5
B
Boron
2300 3658 2.34
6
C
Carbon
3527 4827
(sublimes) 2.260 (graphite)
3.513 (diamond)
7
N
Nitrogen
-209.86 -195.8 0.0012506 (gas, 273K)
8
O
Oxygen
-218.4 -182.96 0.001429 (gas, 273K)
9
F
Fluorine
-219.62 -188.14 0.001696 (gas, 273K)
10
Ne
Neon
-248.67 -246.05 0.00089994 (gas, 273K)
11
Na
Sodium
97.81 882.9 0.971
12
Mg
Magnesium
648.8 1090 1.738
13
Al
Aluminum
660.37 2467 2.698
14
Si
Silicon
1410 2355 2.329
15
P
Phosphorus
44.1 (white)
410 (red, under pressure) 280 (white) 1.82 (white)
16
S
Sulfur
113 (α)
119 (b)
106.8 (g) 444.67 2.070 (α)
1.957 (b)
17
Cl
Chlorine
-100.98 -33.97 0.003214 (gas, 273K)
18
Ar
Argon
-189.37 -185.86 0.001784 (gas, 273K)
19
K
Potassium
63.65 774 0.862
20
Ca
Calcium
839 1484 1.55
21
Sc
Scandium
1541 2831 2.989
22
Ti
Titanium
1660 3287 4.54
23
V
Vanadium
1887 3377 6.11 (292 K)
24
Cr
Chromium
1857 2672 7.19
25
Mn
Manganese
1244 1962 7.44
26
Fe
Iron
1535 2750 7.874
27
Co
Cobalt
1495 2870 8.90
28
Ni
Nickel
1453 2732 8.902 (298 K)
29
Cu
Copper
1083.4 2567 8.96
30
Zn
Zinc
419.58 907 7.133
31
Ga
Gallium
Melissa's hair stands up on end after she takes her wool hat off in the winter but not in the summer
Answer:
Static electricity
Explanation:
A static reaction is transpiring with the surrounding air as well as her hair.
A 20 Ohm resistance is connected
across the secondary winding of a
single-phase power transformer
whose secondary voltage is 150 V.
Calculate the primary voltage if the
supply current is 5 A, neglecting
losses.
Answer: 225 V
Explanation:
Given:
Secondary voltage,V2 = 150v
Resistance is connected across secondary winding,∴R2 = 20Ω
Supply current, ie, I1 = 5A
[tex]\text{Now, secondary current,} \ $I_{2}=\frac{V_{2}}{R_{2}}=\frac{150}{20}=7.5$$$\therefore I_{2}=7.5 \mathrm{~A}$$For Transformers, we have $\frac{N_{2}}{N_{1}}=\frac{V_{2}}{V_{1}}=\frac{I_{1}}{I_{2}}$ so, Taking $\frac{N_{2}}{N_{1}}=\frac{l_{1}}{l_{2}}$ inserting all given \& obtained values, we get $\frac{N_{2}}{N_{1}}=\frac{5}{7.5}$$$\therefore \text { Turns ratio }=\frac{N_{1}}{N_{2}}=\frac{7.5}{5}=\frac{3}{2}=3: 2$$[/tex]
[tex]\text{Again taking,}\frac{N_{1}}{N_{2}}=\frac{V_{2}}{V_{1}}$ \\So, \\$V_{1}=\frac{N_{1}}{N_{2}} V_{2}\\$ inserting all values, we get, $V_{1}=\frac{7.5}{5} * 150=225$\\Therefore, \fbox{Primary voltage, {$V_{1}=225 \mathrm{~V}$}}[/tex]
13. A mass of 1 kg undergoes simple harmonic motion with amplitude of 1 m. If the period of the oscillation is 1 s, calculate the internal energy of the system.
Please show all of your work.
first we need omega
T=1sHence
[tex]\\ \rm\rightarrowtail \omega=\dfrac{2\pi}{T}=2\pi[/tex]
Now
Total energy:-
[tex]\\ \rm\rightarrowtail \dfrac{1}{2}m\omega ^2A^2[/tex]
[tex]\\ \rm\rightarrowtail \dfrac{1}{2}(1)(2\pi)^2(1)^2[/tex]
[tex]\\ \rm\rightarrowtail \dfrac{1}{2}(4\pi ^2[/tex]
[tex]\\ \rm\rightarrowtail 2\pi ^2[/tex]
[tex]\\ \rm\rightarrowtail 2(3.14)^2[/tex]
[tex]\\ \rm\rightarrowtail 19.72J[/tex]
Where in their life cycle are stars on the main sequence?.
Answer ,,a main sequence stars burns through the hydrogen in it's core
Explanation:
When the stars go out
Eventually,reaching the end of its life cycle. At this point, it leaves the main sequence. Stars smaller than a quarter the mass of the sun collapse directly into white dwarfs
A circuit has a resistance of 2.5 N and is powered by a 12.0 V battery.
The current in the circuit, to the nearest tenth, is what ?
Activity 1. Circuit Designer
DIRECTIONS: Draw the corresponding circuit diagram and symbols using the given
number of components. If the diagram is given identify its components.
Please answer this correctly thank you.
The circuit diagram is a representation of an electric system. It represents the components of the system with symbols. Drawings in the attached file.
What is a circuit diagram?The circuit diagram is an electrical circuit representation, including the sequence of electrical components or devices.
These diagrams make use of different symbols to represent the elements in the electrical circuit and make clear the connections to one another.
Some of the components composing the electrical circuits are
Single electric cell ⇒ It is represented with two perpendicular lines. The larger line indicates the positive terminal, and a shorter line represents the negative terminal.
The battery ⇒ combination of cells. Two or more cells together
NOTE: Some authors represent the battery as a single cell. You should draw your diagrams considering this. In my representations, I will consider a battery as two cells.
Switch ⇒ plug key that allows or stops the current flow. It is represented as two circles and a line between them. If it is open, it is a perpendicular line. If it is closed, it is a horizontal line.Wire ⇒ connection between devices. It is represented as a continuous line.
Bulb ⇒ devise that glows when connected to electricity. It might be represented as a cross in a circle.
The resistor ⇒ regulates the amount of energy provided by the source. It is represented as a zig-zag line or a rectangle.
The ammeter ⇒ measures the current. Represented with an A.
Voltmeter ⇒ It measures the voltage. Represented with a V.
In the attached files, you will find the representations and the components. Please remember that a single battery is represented as two single cells. Make changes in your drawings if necessary.
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