Answer:
Explanation:
The voltage of a disconnected charged capacitor increases when the plate area is decreased.
When plate area decreases , capacitance C decreases , but charge Q remains constant .
Q = C V where C is capacitance and V is voltage .
when C decreases , V increases for keeping Q constant .
So the statement is true.
The electric field is dependent on the charge density on the plates.
This statement is true .
The voltage of a connected charged capacitor remains the same when the plate area is decreased .
For a connected capacitor , V or voltage is constant which is equal to voltage of charging battery .
So the statement is true .
Describe what happens to the magnitude of the net electrostatic force on the electron as the electron
is moved toward the positive plate. [1]
When the electron is moved toward the positive plate, the electrostatic force increases causing the electron to be attracted to the positive plate.
What is the electrostatic force?The electrostatic force is the force tat acts between two charges. The nature of this force is described by the Coulumb law.
When the electron is moved toward the positive plate, the electrostatic force increases causing the electron to be attracted to the positive plate.
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he inductance of a tuning circuit of an AM radio is 4 mH. Find the capacitance of the circuit required for reception at 1200 kHz.
Answer:
4.4pF
Explanation:
the capacitance of the circuit required for reception is given:
wL = [tex]\frac{1}{wC}[/tex]
w = 2π [tex]f[/tex]
Using both equation
Capacitance is given
C = 1 - 4π2 f2 L
1- 4×9.8969×144×10 10 ×0.004
=4.4pF
You dip your finger into a pan of water twice each second, producing waves with crests that are separated by 0.19 m. (a) Determine the frequency of the water waves. Hz (b) Determine the period of the water waves. s (c) Determine the speed of the water waves.
Answer:
a) The frequency of the waves are = 2 Hz (since you are making two pulses every second)
b)The period of the waves is 0.19 m (as the consecutive crests are separated by 0.19 m)
c) V = L x f
v = 0.19 m x 2 S-1 (Hz is actually per second)
v = 0.38 ms-1
pe nis
1. What is the ideal mechanical advantage of a wedge that is 12 cm long
and 4 cm wide?
A. 16
B. 48
C. 3
D. 8
On half of the moon appears to be lit (Light is on the RIGHT side of the moon)
this is science btw!!
Answer:
Moon appears lit on the right half of the Moon during the First Quarter. The Moon appears lit on the left side during the Third Quarter because the Moon is on the other side of Earth. Again, if you think of the baseball analogy, and you’re standing at home plate, the first base or First Quarter is on your right side.
Explanation:
i hope is help
)) What do these two changes have in common?
mixing chocolate syrup into milk
rain forming in a cloud
) Select all that apply.
Both involve chemical bonds breaking.
Both are changes of state.
Both are only physical changes.
Both are chemical changes.
Answer:
Both are only physical changes
Explanation:
A physical change is a change that does not involve or alter the chemical composition of the substances involved. Physical changes form no new substance and can be easily separated into individual constituents. Example of physical changes are change in state, boiling, melting etc.
According to this question, two processes were given as follows:
1. mixing chocolate syrup into milk
2. rain forming in a cloud
These two processes are similar in the sense that they are both examples of physical changes.
A researcher plans to release a weather balloon from ground level, to be used for high-altitude atmospheric measurements. The balloon is spherical, with a radius of 2.00 m, and filled with hydrogen. The total mass of the balloon (including the hydrogen within it) and the instruments it carries is 20.0 kg. The density of air at ground level is 1.29 kg/m3. (a) What is the magnitude of the buoyant force (in N) acting on the balloon, just after it is released from ground level
Answer:
B = 423.64 N
Explanation:
The thrust force in a fluid is equal to the weight of the displaced fluid,
B = ρ g V
where the density is that of air ρ=1.29 kg / m³ and the volume of the spherical balloon is
V = [tex]\frac{4}{3} \pi r^3[/tex]
v = 4/3 π 2³
V = 33.51 m³
let's calculate the thrust
B = 1.29 9.8 33.51
B = 423.64 N
PLEASE HELP!
what would the answer be?
Answer:
Tie aluminium foil on each end of the battery using rubber band, then use copper wire to attach the led to the aluminium foil...... probably would work
Because of surface tension, it is possible, with care, to support an object heavier than water on the water surface. The maximum thickness, h, of a square material that can be supported is assumed to be a function of the length of the side of the square, the density of the material, the acceleration of gravity, and the surface tension of the liquid. Develop a suitable set of dimensionless parameters for this problem.
Answer:
[tex]\pi 1 = \frac{h}{l}[/tex]
[tex]\pi 2 =[/tex] б / [tex]l^2gp[/tex]
[tex]\frac{h}{l} =[/tex] Ф ( б / [tex]l^2gp[/tex] )
Explanation:
Develop a suitable set of dimensionless parameters for this problem
The set of dimensionless parameters for this problem is :
[tex]\pi 1 = \frac{h}{l}[/tex]
[tex]\pi 2 =[/tex] б / [tex]l^2gp[/tex]
[tex]\frac{h}{l} =[/tex] Ф ( б / [tex]l^2gp[/tex] )
and they are using the pi theorem, MLT systems
attached below is a detailed solution
a. If half of the weight of a flatbed truck is supported by its two drive wheels, what is the maximum acceleration it can achieve on dry concrete where the coefficient of kinetic friction is 0.7 and the coefficient of static friction is 1m/s^2.
b. Will a metal cabinet lying on the wooden bed of the truck slip if it accelerates at this rate where the coefficient of kinetic friction is 0.3 and the coefficient of static friction is 0.55?
c. Answer both of these questions for the case that the truck has four-wheel drive, and the cabinet is wooden.
Answer:
A) a_max = 4.9 m/s²
B) the metal cabinet will not slip.
C) a_max = 9.8 m/s². The cabinet will slip.
Explanation:
A) We are given;
Coefficient of static friction; μ_s = 1
Coefficient of kinetic friction; μ_k = 0.7
Formula for maximum static friction;
F_s = μ_s•N
We are dealing with half of the weight of a flatbed truck. Thus;
N = mg/2
Thus;
F_s(max) = ½μ_s•mg
Now, the maximum acceleration it can achieve on dry concrete will be when the Maximum static friction is reached.
Because after maximum static friction, the cabinet will slip.
Thus; F_s(max) = ma
Therefore,
ma = ½μ_s•mg
m will cancel out to give;
a = ½μ_s•g
a = ½ × 1 × 9.8
a_max = 4.9 m/s²
B) we are told that the coefficient of static friction is now 0.55
Thus, the friction between the metal and the wood is;
F = μ_s•g = 0.55 × 9.8
F = 5.39 N
The acceleration gotten in the first part is less than μ_s•g = 5.39 N, then the metal cabinet will not slip.
C) Now, if we are considering a 4 wheel drive, then we will not divide the mass by 2 and so; N = mg
Like we did in A above;
ma = μ_s•mg
a = μ_s•g
a = 1 × 9.8
a = 9.8 m/s²
Now, this value of a_max is greater than μ_s•g in answer A above.
Thus, a_max > μ_s•g and thus, the cabinet will slip.
why do the stars rotate
Answer:
Angular momentum
Explanation:
Stars are formed as a result of a collapse of a low-temperature cloud of gas and dust. During the colapse conservation of angular momentum causes any small net rotation of the cloud to increase thus forcing the material into rotating
A block starting from rest slides down the length of an 18 plank with an acceleration of 4.0 meters per second. How long does the block take to reach the bottom?
Answer:
[tex]\boxed{\text{\sf \Large 3.0 s}}[/tex]
Explanation:
Use distance formula
[tex]\displaystyle d=ut+\frac{1}{2} at^2[/tex]
[tex]u= \text{\sf initial velocity}\\d= \text{\sf distance}\\a= \text{\sf acceleration}\\t= \text{\sf time taken}[/tex]
[tex]\displaystyle 18=0 \times t+\frac{1}{2} \times 4 \times t^2[/tex]
[tex]t=3[/tex]
A block starting from rest slides down the length of an 18 m plank with an acceleration of 4.0 meters per second square. Time taken by the block to reach at the bottom is 3 sec.
What is acceleration?The rate at which an object changes its velocity is known as acceleration. Acceleration is a vector quantity. If an object's velocity is changing then it is accelerating and an object with a constant velocity is not accelerating.
The speed at which something moves in a specific direction is known as its velocity. As an illustration, think of the speed of a car travelling north on a highway or the speed at which a rocket takes off.
Given that in the question block slides down an 18 m plank length with an acceleration of 4.0 meters per second square when it begins at rest.
Using equation of motion,
S = ut + (1/2)at²
s is distance, s = 18 m
u is initial velocity, u = 0
a is acceleration, a = 4 m/sec²
t is time
18 = 0*t + (1/2)*4*t
solving we get t = 3 sec.
Time taken by the block to reach at the bottom is 3 sec.
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help meee plisssssssssssssssssssssssssssss
Answer:
Resistance = 0.22 Ohms
Current = 13.63636 A
Explanation:
Total resistance for resistors in parallel is given by:
[tex]\frac{1}{T} =\frac{1}{R1} +\frac{1}{R2} +...+\frac{1}{Rn}[/tex] where n is the number of resistors
[tex]\frac{1}{T} = \frac{1}{1.1} +\frac{1}{1.1} +\frac{1}{1.1} +\frac{1}{1.1} +\frac{1}{1.1}[/tex]
if you solve that you get [tex]\frac{1}{T} = 5/1.1 \\\\T = 1.1/5T = 0.22 Ohms[/tex]
Solve current using V=IR
I=V/R =
I=3/0.22
I = 13.63636 A
9. Name the two different symbols used to store all digital data on microchips in binary code. Explain how only two options can store such a great variety of data, such as a digital picture of a kitten. (1 point)
Answer:
x and y, or 0 and 1. These two symbols form hundreds of patterns that represent data like numbers, letters, even pictures, and videos. Digital images are made up of pixels, and each pixel contains binary code. When all that code comes together and the pixels are formed we can see things like family photo albums or we can watch a movie on our phones. We can even see a digital picture of a kitten I guess. k, bye.
Explanation:
The acceleration used for the height is 9.81 m/s2 because it is the acceleration due to gravity. (true or false)
Answer:
true
Explanation:
Gravity (or the acceleration due to gravity) is 9.81 meters per second squared, on the surface of Earth, because of the size of Earth and the distance we are on its surface from its center.
What are some ways the government can help reduce greenhouse gases?
Answer:
Switching power plants, for example, from coal-burning to gas-burning can significantly reduce emissions. Equip fossil fuel plants with carbon capture and storage technology. ... Although it doesn't exactly reduce emissions, carbon capture technology does prevent emissions from reaching the atmosphere.
Can atoms go bad?, not in the reversible way like ionization and isotopes but really malfunction our die.
Answer:
atoms cannot go bad
Explanation:
Because they stay alive and get good nutriants
A child falls sideways off the sled while sledding on frictionless ice. What happens to the velocity of the sled
Answer:
Same as before.
Explanation:
we can use momentum conservation to solve the problem.
Let mass of child be m and of the sled be M. Also let both have initial velocity u.
since, child fells off on the sled it will still have same velocity of ''u''.
By momentum conservation we have,
(M + m) x u = m x u + M x v
⇒ Mu=Mv
⇒ u=v
Hence, velocity of the sled remains the same.
1. Is it possible for the ball to move so quickly that the angle between the cable and vertical post stays at ninety degrees?
2. When the ball is moving in a horizontal circle, what vertical force (or component) balances gravity?
3. What happens to the centripetal force as the length of the cord increases?
Answer:
Tetherball is an interesting game in which two players tries to hit the ball hard so that it goes around the
pole.Each time the player hits the ball, it's orbit rises higher off the ground.Let's understand the physics
behind this.The motion of a tetherball is governed by two forces.These two forces combine to generate a
net force, i.e. centripetal force.If the ball is moving more quickly, it requires a greater centripetal force,
which in turn requires a greater tension force.Since the ball's weight hasn't changed, the angle of the
tension force changes until the ball is in vertical equilibrium.
To access this physics simulation visit: http://goo.gl/xVdwgO Page 02Exploration Series www.ck12.org
Ball Mass : This slider controls the mass of the ball. A ball with more mass will have more inertia, requiring
a greater net force to accelerate it. A ball with more mass will ALSO have a greater gravitational force
acting on it. Watch both of these effects occur when you manipulate this slider.
Cable Length : This slider controls the length of the cable. A longer cable is capable of allowing a greater
circular radius of motion for the ball. It is important to remember that the radius of the circular motion is
NOT equal to the length of the cable. Instead, if you want to understand the size of the circle of the ball's
motion, ignore the cable and just imagine the path of the ball.
Ball Speed : This slider controls the speed of the ball - imagine a kid just hit the ball and it sped up. A ball
moving more quickly is also accelerating more quickly because its velocity is changing as it moves in a
circle (remember that changes in DIRECTION of velocity 'count' as changes to velocity).
Force Diagram : This allows you to turn on or off the diagram of the forces acting on the ball. Look for the
ball to be in vertical force balance, which means the vertical component of tension is canceled by the
gravitational force. The ball should NOT be in horizontal force balance - it is accelerating towards the center
of the circle! It is important to note that this free body diagram should really be moving with the ball so that
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the tension force always points along the cord - we are just showing the forces at the moment the ball is at
the furthest-right on this screen.
Centripetal force vs Tetherball speed : This is a plot of centripetal force required to keep the ball in
circular orbit about the pole as a function of its speed. As expected, a more quickly-moving ball is changing
in velocity more often in a given amount of time, and so is accelerating more. This greater (centripetal, or
center-pointing) acceleration requires a greater net force.
Explanation:
The potential energy of an object is 16.0 joules. The object is 145cm high.
What is the mass of the object?
Answer:
I don't know but you got this!!
6) The acceleration due to gravity on Mars surface is 37.9% of that on Earth. An
astronaut's life support backpack weighs 300 lb on Earth. What does it weigh on the
Red Planet?
Weight is directly proportional to the acceleration of gravity wherever you happen to be at the moment.
If the backpack weighs 300 lb on Earth, and you take it to a place where gravity is 37.9% of Earth's gravity, then the backpack will weigh
(37.9%) x (300 lb)
(0.379) x (300 lb)
That's 113.7 lb.
8. A weight lifter lifts a set of weights a vertical distance of 2 m. If a constant net force of 350 N is exerted on the weights, what is the net work done on the weights? Please show full working out ( not in words)
Answer: Work = change in energy which can be calculated by force * displacement so taking this we can multiply 350n by *2m and we can come out with 700 joules
Explanation: I Hope This Helps I'm new at this.
A metal pot feels hot to the touch after a short time on the shove. what type of material is the metal pot
can someone pls help
Answer:i
Explanation:∩
What is the tension on a rope holding up a 7.50 kg box?
A) 7.50N
B) 73.5N1
C) 7.3N
D) 0.765N
Answer:
B
Explanation:
F=m×g
=7.50×9.8 (standard gravitational force of earth)
=73.5N
The correct option is (b) 73.5N.
Tension is the force produced by pulling something tightly, a strain in a relationship, or physical or mental strain. The feeling of trying to reach a deadline is an illustration of tension. For example -Pulling the rubber band's two ends apart further and further is an illustration of tension.Is tension force?The force transferred through a rope, string, or wire when two opposing forces pull on it is known as the tension force. The tension force pulls energy equally on the bodies at the ends and is applied along the entire length of the wire.F= 7.50 kg is given in this question .
So, we apply formula
F=m×g
=7.50×9.8 (g= 9.8standard gravitational force of earth)
=73.5N
Therefore, The tension on a rope holding up is 73.5N .
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2. Predict what will happen if the 80 kg adult was further from the pivot (more right) and explain your reasoning. 3. Predict what will happen if the 30 kg child was closer to the pivot (more right) and explain your reasoning. 4. Test your predictions in the Balance Lab. Make notes about any ideas you have that need to be changed. 5. What are some rules you could use to make predictions for other situations where masses are on a balance
Answer:
2) τ = F x torque increases, 3) troque decreases,
4) man approaches the pivot and the child must move away
5) Σ τ = 0
Explanation:
2) when the man moves away from the pivot his torque increases significantly, since his distance increases
τ = F x
τ = m g x
therefore the system rotates faster
3) when the child approaches the pivot, his troque decreases, because the distance decreases
τ = f x
therefore the system must spin slower
4) If we place the man and the child on the side of a scale, the movement must be the man approaches the pivot and the child must move away, so that the torque is the same and the system can reach a balance
5) the rotational equilibrium expression
Σ τ = 0
is the one that describes the equilibrium of a system with several forces
Following are the solution to the given points:
For question 2:
If the guy was further to the right, say the [tex]5^{th}[/tex] unit,[tex]\to W_2\times d_2=80\times 5=300\ units[/tex]
Since this value is larger than [tex]W_1\times d_1=30\times 8=240\ units[/tex]As just a result, the boards will lean towards the guy, and will tumble to the right.For question 3:
If the girl was [tex]6^{th}[/tex] units closer to a pivot,[tex]\to W_1\times d_1=30\times 6=180 \ units[/tex]
This value is once again less than [tex]W_2\times d_2=80\times 3=240\ units[/tex]As just a result, the boards will tilt towards the guy, and will fall to the right.For questions 4 and 5:
Whenever experimenting, verify that the mass you utilize and the distance you travel are carefully measured. Since even a tiny quantity of ambiguity in such measures can produce unexpected results.Learn more:
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The new roller coaster at Carowinds flies along at 80 m/s. How long does it take to
travel 16000 meters of track?
What are Heredity and Punnett Squares?
Answer: A Punnett square can be used to predict genotype and phenotypes of offspring from genetic crosses. ... In the P generation, one parent has a dominant yellow phenotype and the genotype YY, and the other parent has the recessive green phenotype and the genotype yy.
Explanation:
how were the outer planets formed?
Answer:
All planets including the outer larger planets were formed at the same time somewhere around 4.5 Billion years ago.
Explanation:
the young sun drove away most of the gas from the inner solar system, leaving behind the rocky cores also known as the terrestrial planets.
A solenoid consists of 4200 turns of copper wire. The wire has a diameter of 0.200 mm. The solenoid has a diameter of 1.00 cm. When the solenoid is connected to a 12.0 V battery, we observe that the current increases over time and is 155 mA after 1.50 milliseconds have passed. Assume that the internal resistance of the battery and connecting wires is negligible.
Required:
a. What is the length of wire needed to form the solenoid?
b. What is the inductance of the solenoid?
c. What is the length of the solenoid?
d. What will be the current after three time constants have elapsed?
Answer:
a. The length of the solenoid wire is approximately 131.95 m
b. The inductance of the solenoid is approximately 2.078 × 10⁻³ H
c. The length of the solenoid is 0.84 m
d. The current after three time constants have elapsed is approximately 456.1 A
Explanation:
The given parameters are;
The number of turns in the solenoid, N = 4,200 turns
The diameter of the wire, d = 0.200 mm
The diameter of the solenoid, D = 1.00 cm
The voltage of the battery connected to the solenoid, V = 12.0 V
The current increase = 155 mA
The time for the increase = 1.50 millisecond
The internal resistance of the battery is negligible
a. The length of wire needed to form the solenoid, l = π·D·N
∴ l = π × 0.01 × 4,200 ≈ 131.95
The length of the solenoid, l ≈ 131.95 m
b. The inductance, 'L', of the solenoid is given as follows;
[tex]L = \dfrac{\mu_0 \cdot N^2 \cdot A}{l}[/tex]
Where;
μ₀ = 12.6 × 10⁻⁷ H/m
N² = 4,200²
A = The cross sectional area of the solenoid = π·D²/4
l = Length of the solenoid = d × N = 0.0002 m × 4,200 = 0.84 m
∴ L = (12.6 × 10⁻⁷ × 4,200² × 0.01² × π/4)/0.84 ≈ 0.002078 = 2.078 × 10⁻³
The inductance, L ≈ 2.078 × 10⁻³ H
c.) The length of the solenoid = d × N = 0.0002 m × 4,200 = 0.84 m
The length of the solenoid = 0.84 m
d. The current after three time constant
We have;
∈ = -L × di/dt
di/dt = 155 mA/1.5 ms = 103.[tex]\overline 3[/tex] A/s
∈ = 103.[tex]\overline 3[/tex] A/s × 2.078 × 10⁻³ H = 0.21472[tex]\overline 6[/tex] V
We have;
[tex]\tau = \dfrac{t}{\left(ln\dfrac{1}{1-\dfrac{Change}{Final-Start} } \right)}[/tex]
The change in voltage = 0.21472[tex]\overline 6[/tex] V
The start voltage = 0 V
The final voltage = 12.0 V
t = 1.5 ms = 0.0015 s
We get;
[tex]\tau = \dfrac{0.0015}{\left(ln\dfrac{1}{1-\dfrac{0.21472\overline 6}{12-0} } \right)} \approx 8.3076\times 10^{-2}[/tex]
τ = L/R
Therefore,
R = L/τ =
The resistance = 2.078 × 10⁻³/(8.3076×10⁻²) = 0.0250
The resistance = 0.0250 Ω
[tex]I= \dfrac{V}{R} \cdot \left(1 - e^{-\dfrac{t}{\tau} }\right)[/tex]
Therefore, after three time constants, we have;
∴ I = (12.0/(0.0250)) × (1 - e⁻³) ≈ 456.1
The current after three time constants have elapsed, I ≈ 456.1 A.