Answer:
For a photocopier to work, a field of positive charges must be generated on the surface of both the drum and the copy paper. These tasks are accomplished by the corona wires. These wires are subjected to a high voltage, which they subsequently transfer to the drum and paper in the form of static electricity.
help me, i don't know the answer
Explanation:
1)
A) Bb BB
B) 50%
2)
A) 50%
B) b. b
B. Bb. Bb
b. bb. bb
A 12 v battery produces a current of 25 amps. What is the resistance
Please help me
Answer:
The resistance is 2 ohms
A twirler’s baton is 0.76 m long and spins around its center. the end of the baton has a centripetal acceleration of 47.8 m/s2. how long does it take the baton to complete one spin? 0.31 s 0.56 s 4.3 s 70 s
The time it takes the baton to complete one spin is determined as 0.56 s.
Time of motion of the baton
The time of motion of the baton is calculated as follows;
a = 4π²R/T²
where;
R is radius of the wire = ¹/₂(0.76) = 0.38T² = 4π²R/a
T² = (4π² x 0.38)/47.8
T² = 0.3138
T = 0.56 s
Thus, the time it takes the baton to complete one spin is determined as 0.56 s.
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An oscillator makes 720 vibrations in 3 minutes.
A: How many vibrations does it make in one minute?
B: How many vibrations does it make in one second?
C: What is its period in seconds?
D: What is its frequency in hertz?
Answer:
Below :)
Explanation:
A) 720/3 =240. 40 per minute.
B) 720/180 = 4 per second.
C) T=1/4 s^-1 (the formula) = 1/4 s. (The time peroid.)
D) V=1/T
V= 4 Hz
[tex]\qquad\qquad\huge\underline{{\sf Answer}}[/tex]
An oscillator makes 720 vibrations in 3 minutes. so, we have to solve the given problems based on it ~
#1. what's the number of vibrations per minute •
[tex]\qquad \sf \dashrightarrow \: 3 \: min = 720 \: vib[/tex]
[tex]\qquad \sf \dashrightarrow \: 1 \: min = \dfrac{720}{3} [/tex]
[tex]\qquad \sf \dashrightarrow \: 1 \: min = 240 \: vib[/tex]
#2. Calculate unit vibrations per second •
[tex]\qquad \sf \dashrightarrow \: 1 \: min = 240 \: vib[/tex]
[tex]\qquad \sf \dashrightarrow \: 60 \: sec = 240 \: vib[/tex]
[tex]\qquad \sf \dashrightarrow \: 1 \: sec = 4 \: vib[/tex]
#3. What's it's time period •
time taken to do 1 vibration is known as a period, so we can infer that :
[tex]\qquad \sf \dashrightarrow \: 1 \: vib = \dfrac{1}{4} \: sec[/tex]
[tex]\qquad \sf \dashrightarrow \: t = 0.25 \: sec[/tex]
#4. what is it's frequency in hert •
[tex]\qquad \sf \dashrightarrow \: f = \dfrac{1}{t} [/tex]
[tex]\qquad \sf \dashrightarrow \: f = \dfrac{1}{0.25} [/tex]
[tex]\qquad \sf \dashrightarrow \: f = 4 \: hertz[/tex]
you are designing an airport for small planes. one kind of airplane that might use this airfield must reach a speed before takeoff of at least 27.8m/s and can accelerate at 2.00m/s a)if the runway is 150m long,can this airplane reach the required speed for take off?(in this case v=24.5 m/s) b) if not, what minimum length must the runway have(193m)
(a)The required speed for take off will be 24.49 m/sec.
(b)The minimum length must the runway have 193 m.
What is speed?Speed is defined as the rate of change of the distance or the height attained. it is a time-based quantity. it is denoted by u for the initial speed while v for the final speed. its SI unit is m/sec.
(a)The required speed for take off will be 24.49 m/sec.
From the Newtons third equation of motion;
[tex]\rm v^2 = u^2+2as \\\\ v=0+2 \times 2 \times 150 \\\\ v=\sqrt{600}\\\\ v=24.49 \ m/sec[/tex]
Hence, the required speed for take off will be 24.49 m/sec.
(b)The minimum length must the runway have 193 m.
From the Newtons third equation of motion;
[tex]\rm v^2 = u^2+2as \\\\ (27.78)^2 = 0+2\times 2 s \\\\\ s=192.93 \ m[/tex]
Hence, the minimum length must the runway have 193 m.
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please help me with the question below the best answer with an explanation will get brainliest
Answer:
B
Explanation:
i hope this is correct.
Station A
? Arrival Time for P Wave
minu
? Arrival Time for 5 Wave
? S-P Lag Time (secs)
? Distance from Epicenter (km)
30
Station B
TIME(econd
Station B
? Arrival Time for P Wave
wwwwwwww
? Arrival Time for S Wave
? S-P Lag Time (secs)
? Distance from Epicenter (km)
30
TIME (second)
-Buon C
Station C
? Arrival Time for P Wave
10
призми мили
? Arrival Time for S Wave
? S-P Lag Time (secs)
100
300
200
Distance from Epicenter
? Distance from Epicenter (km)
90
TIME (second)
NOW: Use your information above to determine which earthquake these seismographs represent. Check the correct box!
90
2
8
8
*PART THREE:
MYSTERY EARTHQUAKE
/Mark the start of the P Wave AND S Wave
Find the Lag Time
Use the Lag Time Graph to determine each
Stations' distance to the epicenter.
Based on the Distances, choose which map
depicts your earthquake!
Graph
Lag time of S-wave behind P-wave
(seconds)
100 0
8
Nasme
8
A wave travels at 18 m/s and has a wavelength of 3 meters. What is the frequency of the wave?
Answer:
0.1667Hz
Explanation:
by explanation frequency is given by 1/time
after carrying out the calculation of time we can easily get frequency.
time=speed/distance
=18/3
=6s
but frequency=1/time
hence=1/6
=0.1667hertz
Which is the last stage in the life cycle of an average star? (1 point)
A.white drawf
B.super red giant
C. planetary nebula
D.neutron star
Answer:
The answer is A. White Dwarf
Explanation:
average stars like sun end their life as white dwarf surrounded by disappearing planetary nebula.Aluminum is often melted down for recycling purposes. Assuming 1 kg of aluminum is at room temperature, what is the minimum amount of heat needed to melt it to a liquid? The specific heat capacity of aluminum is 899 J/kg°C, the melting point is 660°C, and the latent heat of fusion is 3.97 x 105 J/kg.
60 points
The minimum amount of heat needed to melt it to a liquid will be 569.067 kJ.
What is enthalpy of fusion?The minimum amount of heat needed to melt it to a liquid is known as the enthalpy of fusion.
The formula for the enthalpy of the fusion is;
[tex]\rm L_f=Q/m \\\\ L_f=mCdt/m \\\\ L_f= Cdt \\\\ L_f= 899 J/kg^0C \times (660^0-27^0) \\\\ L_f= 569,067 \ J \\\\\ L_f=569.067 \ kJ[/tex]
Hence, the minimum amount of heat needed to melt it to a liquid will be 569.067 kJ.
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On a space mission, the gravitational environment can negatively affect the bone density of astronauts. Which accommodation will most likely protect the bone health of the crew on a space mission?.
Answer:
a lot of oxygen with spacesuits
An airplane is flying in a horizontal circle at a speed of 490 km/h. If its wings are tilted at angle ɵ = 45° to the horizontal, what is the radius of the circle in which the plane is flying? Assume that the required force is provided entirely by an “aerodynamic lift” that is perpendicular to the wing surface.
The radius of the circle in which the plane is flying is 1887 m.
What is aerodynamic lift?The aerodynamic lift is the force that keeps the aircraft flying in the air.
Let the aerodynamic lift be F1 sinθ= mv^2/R ---- (1)
and F1 cosθ= mg --------- (2)
Equating (1) and (2) and eliminating the mass;
R = v^2/ g tanθ
Where v = 490 km/h or 136 m/s
R = (136)^2/9.8 * tan 45
R = 18496/ 9.8
R = 1887 m
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Why does Venus have the largest gravitational attraction to the sun compared to the other inner planets?Write your Claim below:
the force of gravity is proportional to the mass of an object and inversely proportional to the square of the distance between the objects.
I NEED HELP!!!!
The three areas of discipline are ________.
isolation
instruction
punishment
admonition
nurture
Answer:
Instruction, admonition, nurture
Explanation:
the practice of training people to obey rules or a code of behavior, using punishment to correct disobedience:what is collinear and concurrent
Answer:
Collinear Force System: When the lines of action of all the forces of a system act along the same line, this force system is called collinear force system. Concurrent Force System: The forces when extended pass through a single point and the point is called point of concurrency.
Throughout this lesson, you learned about the lives and contributions of key scientists in this area of physics. Create a timeline that ties them all together. The timeline does not need to be highly detailed, but it should do the following:
Include at least the four major scientists covered in this unit: Oersted, Ampère, Faraday, and Tesla.
Include key contributions of each scientist and provide a year, if possible, for those contributions.
Note any relationships among these and other scientists, especially if one developed something based on the work of another.
Arrange the scientists chronologically by their first key contribution, not by their birth date.
Oersted -Electromagnetic theory in 1820(July).
Ampere - Static needle -a component of galvanometer in 1820 (September).
Faraday - Electromagnetic induction in 1831.
Tesla - First Alternating current motor and transmission system in 1882.
What is magnetic field?The region of space where a charged object moves in the direction of magnetic force and induces current.
Thus, the scientist are arranged chronologically with their key inventions.
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how are the magnetic domains of a magnet different from the domains of an ordinary piece of metal?
density of water? And tin?
Answer:
the density of water is 1 and tin is 7.31 if i remember right
Explanation:
The two principal sources for the internal heating of terrestrial planets are accretion and radioactivity. radiation and convection. convection and radioactivity. convection and accretion. accretion and eruption.
The three principal sources of internal heat of terrestrial planets accretion and radioactivity. Option A is correct.
What is heat transfer?The term "heat transfer" refers to the movement of heat. The flow of heat across a system's boundary is due to a temperature differential between the system and its surroundings.
The three principal sources of internal heat of terrestrial planets accretion and radioactivity.
Option A is correct.
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Can someone please answer this, ill give you brainliest Would be very appreciated.
Answer:
C. Surface tension
What property of water allowed the paperclip to stay on the top of the water?
Solution:Surface Tension
Explanation:The strong surface tension enables the paper clip float on the water, despite its much higher density which is caused by the cohesive forces between liquid molecules.
How do astronauts counteract the effects of microgravity on their bones while they are in space?.
Answer:
they use a spaceship plus oxygen space has a gravitational force
At what time did time begin
50 points :)
Answer:
According to the standard big bang model of cosmology, time began together with the universe in a singularity approximately 14 billion years ago.
Explanation: the big bang
Answer:
approximately 14 billion years ago
Show that the square of the period of revolution of a satellite is directly proportional to the cube of the orbital radius
Answer:
Explanation:
what could you do to increase the final momentum of a golf ball?
Answer:
I would hit it as hard as you can with the club.
Explanation:
well one thing that I like to do is hit the golf ball as hard as possible with the club.
This is because for me, when I do that, I can normally get more momentum which means I also get a farther hit.
The brightness of a star decreases by the square of the distance. This is known as:.
Answer:
inverse-square law.
Explanation:
Since the area increases as the square of the distance, the brightness of the light must decrease as the inverse square of the distance.
hope this helped you!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Answer:
Second choice
Explanation:
I suppose ME is the same as POTENTIAL energy
ME = mgh = 70 * 10 * 12 = 8400j
Half way down, 4200 j is converted to Kinetic Energy
1/2 m v^2 = 4200
1/2 (70) v^2 = 4200 v = 10.95 m/s
Just before impact ALL of the 8400 j is now KE
1/2 (70)v^2 = 8400 v = 15.49 m/s
Question 19 of 20
Which force causes the protons in an atom to be attracted to one another?
OA. Strong nuclear
OB. Magnetic
OC. Weak nuclear
OD. Electric
The force that causes the protons in an atom to be attracted to one another is Strong nuclear.
What is nuclear force?Nuclear force is a force that acts between the protons and neutrons of atoms.
Neutrons and protons, both nucleons, are affected by the nuclear force almost identically and it is responsible for the attraction of protons in an atoms.
Thus, the force that causes the protons in an atom to be attracted to one another is Strong nuclear.
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#2. If we have a 9V battery connected to a 100 resistor , what is the current ?
Answer:
90 mAmps
Explanation:
V=IR
V/R = I
9 v / 100 ohm = .09 amps = 90 mAmps
Select all the correct answers. which two statements are true about all generators? they convert motion energy to electric energy. they have a fixed pair of magnets and a rotating metal coil. they’re powered by fossil fuels. they convert electric energy to motion energy. they use the relative motion of a magnet and a coil of wire.
The two correct statements about generators are, they convert motion energy to electric energy and they use the relative motion of a magnet and a coil of wire.
What are generators?Generators are devices which convert mechanical energy into electrical energy.
Generators work by the laws of electromagnetism.
There are two types of generators, A.C. and D.C. generators.
Therefore, the two correct statements about generators are, they convert motion energy to electric energy and they use the relative motion of a magnet and a coil of wire.
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What type of nuclear reaction is shown in the diagram below? Write 2 - 3 sentences describing what happens in this reaction, where it happens, and how the energy released can be harnessed for use in homes.
This happens at Sun 's inside
The process is called fusionThis denotes to
When two hydrogen nucleus combine to form a single helium nucleus.It releases lots of solar energy which can be used to create electricity