Answers
Answer: I don't really see the answer choices.
Explanation:
Related Questions
Sulfur bonds with Beryllium in an ionic bond to create the stable compound Beryllium Sulfide. After the bond occurs, what is the charge of the Sulfur ion?
Answers
Answer:
S²⁺
Explanation:
Beryllium is in group 2, so it has a charge of 2+. So the S ion has to have a charge of 2-.
If the instantaneous voltage at a given moment in the circuit RL is V=VmaxSIN(150), then the instantaneous current at the...... same instant I=Imaxsin
Answers
The instantaneous current at the same moment in the RL circuit can be expressed as I = Imaxsin(150), where Imax represents the maximum current.
1. Given that the instantaneous voltage at a specific moment in the RL circuit is V = Vmaxsin(150).
2. We can express the current at the same moment using Ohm's Law, which states that V = IR, where V is voltage, I is current, and R is resistance.
3. In an RL circuit, the resistance is represented by the symbol R, and it is typically associated with the resistance of the wire or any resistors in the circuit.
4. However, the given equation does not explicitly mention resistance.
5. Since we are considering an RL circuit, it suggests the presence of inductance (L) along with resistance (R).
6. In an RL circuit, the voltage across the inductor (VL) can be expressed as VL = L(di/dt), where L is the inductance and di/dt represents the rate of change of current.
7. At any given instant, the total voltage across the circuit (V) can be expressed as the sum of the voltage across the resistor (VR) and the voltage across the inductor (VL).
8. Therefore, V = VR + VL.
9. Since the given equation represents the instantaneous voltage (V), we can deduce that V = VR.
10. By comparing V = VR with Ohm's Law (V = IR), we can conclude that I = Imaxsin(150), where Imax represents the maximum current.
The specific values of Vmax, Imax, and the phase angle have not been provided in the question, so we are working with the general expression.
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Please show work! A particle vibrates according to the equation x(t) = 0.65 cos(7.4 t)
Determine the frequency. Thanks!!
Answers
D. The frequency of the wave is determined 1.2 Hz.
What is frequency of a wave?The frequency of a wave describes the number of waves that pass a fixed place in a given amount of time.
General wave equation;
y = A cos(ωt)
where;
A is the amplitude of the waveω is the angular frequency of the waveFrom the given wave equation;
x(t) = 0.65 cos(7.4t)
ω = 2πf
7.4 = 2πf
f = 7.4/2π
f = 1.18 Hz
f = ≈ 1.2 Hz
Thus, the frequency of the wave is determined 1.2 Hz.
The correct option is D.
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PLEASE HELP ASAP !!!
The Earth orbits at an average distance of about 145 x 10^9m from the Sun. Light travels through
space at a speed of 3.00 x 10^8 m/s. How many minutes does it take light from the Sun to reach
Earth?
Answers
Answer:
8.06 minutes
Explanation:
Distance = speed x time
time = distanc/speed
From the information given,
speed = 3.00 x 10^8 m/s
distance = 145 x 10^9 m
Thus,
time = 145 x 10^9/3.00 x 10^8
time = 483.33 seconds
Recall,
60 seconds 1 minute
483.33 seconds = 483.33/60 = 8.06
It takes light 8.06 minutes to reach earth from the sun
How are decompression and how gasses dissolve in liquids related? Explain in your own words.
Answers
9.
The refractive index of water will change with its temperature due to the change in
density of its molecules.
a. True
b. False
Answers
A 50 kg mass is placed 2 meters from the fulcrum. To balance the lever, a second object is placed 4 meters
from the fulcrum. What is the mass of the second object?
Answers
Answer:
mass =25 kg
using clockwise moment = anticlockwise moment
Experiment 1: Motion over a curved surface Supplies: Spoon Directions: Hold a spoon such that the water will hit the back of the spoon. The handle of the spoon will be horizontal. Turn on the water, but not full strength though. Questions: (1) What did you observe with the stream of water as it flowed over the spoon
Answers
The water stream will trace a parabolic path similar to that of a free-falling object.
A 15 g bullet is fired horizontally into a 3.000 kg block of wood suspended by a long cord. The bullet comes to a rest in the block. Determine the velocity of the bullet if the impact causes the block to swing 10 cm above its initial level
Answers
The velocity of the bullet if the impact causes the block to swing 10cm above its initial level is 281m/s.
What is law of conservation of momentum?The law of conservation of momentum determines that the momentum of a system remains conserved after a collision. The initial momentum of a system of two bodies is equal to the final momentum of the system.
After collision, initial K.E. (Kinetic energy) of combined mass = 3 × 10 × 0.1 = 3J
1/2 × 3 × v² = 3
v = √2m/s
Conservation of momentum,
15 × v = 3000 × √2
v = 281m/s
Therefore, the velocity of the bullet is 281m/s.
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A liquid x at 25 degree Celsius is poured to a height of 40cm in a capillary tube of length 70cm and the diameter is 1cm .Assume that volume does not change with temperature. A find the initial volume of the liquid in cm^3. B. The temperature is reduced by 10°C causing the liquid to reduce in height to 37cm.Find the volume coefficient of the thermal expansion of the liquid. C. At the initial height of 40cm and temperature of 25°C , what change in temperature is needed for liquid to rise to a height of 49cm.
Answers
The initial volume of the liquid is 31.4 cm³. The volume coefficient of thermal expansion of the liquid is 0.002 per degree Celsius. A temperature increase of 109.5°C is needed for the liquid to rise to a height of 49cm.
The initial volume of the liquid can be found using the formula for the volume of a cylinder:
V = πr²h
where r is the radius (half the diameter), h is the height, and π is approximately 3.14. Plugging in the given values, we get:
V = π(0.5 cm)²(40 cm)
V = 31.4 cm³
The volume coefficient of thermal expansion (β) is defined as the fractional change in volume per degree Celsius change in temperature. It can be calculated using the formula:
β = ΔV/(VΔT)
where ΔV is the change in volume, V is the initial volume, and ΔT is the change in temperature. We can rearrange this formula to solve for ΔV:
ΔV = βVΔT
We know that ΔT = -10°C (a decrease of 10°C) and that the height decreased from 40cm to 37cm, or by 3cm. The change in volume can be found using the formula for the volume of a cylinder again, with the new height of 37cm:
ΔV = π(0.5 cm)²(40 cm - 37 cm)
ΔV = 0.59 cm³
Plugging in all the values, we get:
0.59 cm³ = β(31.4 cm³)(-10°C)
β = 0.002
To find the change in temperature needed for the liquid to rise to a height of 49cm, we can use the same formula as before, but solve for ΔT:
ΔT = ΔV/(βV)
We know that ΔV is the difference between the initial volume and the volume at the new height, which is:
ΔV = π(0.5 cm)²(49 cm - 40 cm)
ΔV = 6.86 cm³
Plugging in all the values, we get:
ΔT = 6.86 cm³/(0.002)(31.4 cm³)
ΔT = 109.5°C
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gAn optical engineer needs to ensure that the bright fringes from a double-slit are 15.7 mm apart on a detector that is from the slits. If the slits are illuminated with coherent light of wavelength 633 nm, how far apart should the slits be
Answers
Answer:
d = 68.5 x 10⁻⁶ m = 68.5 μm
Explanation:
The complete question is as follows:
An optical engineer needs to ensure that the bright fringes from a double-slit are 15.7 mm apart on a detector that is 1.70m from the slits. If the slits are illuminated with coherent light of wavelength 633 nm, how far apart should the slits be?
The answer can be given by using the formula derived from Young's Double Slit Experiment:
\(y = \frac{\lambda L}{d}\\\\d =\frac{\lambda L}{y}\\\\\)
where,
d = slit separation = ?
λ = wavelength = 633 nm = 6.33 x 10⁻⁷ m
L = distance from screen (detector) = 1.7 m
y = distance between bright fringes = 15.7 mm = 0.0157 m
Therefore,
\(d = \frac{(6.33\ x\ 10^{-7}\ m)(1.7\ m)}{0.0157\ m}\\\\\)
d = 68.5 x 10⁻⁶ m = 68.5 μm
A vehicle, starting from rest, accelerates on a circular track with a 335m diameter.
Answers
The distance travelled by the vehicle around the circular track is 1,052.4 m.
What is the distance travelled by the vehicle in one complete cycle?
The distance travelled by the vehicle in one complete cycle is calculated by using the following equation as show below.
d = 2πr
d = πd
Where;
r is the radius of the circular trackd is the diameter of the circular trackIn one complete cycle, the vehicle will travel the circular track only once.
d = π(335 m)
d = 1,052.4 m
Thus, the distance travelled by the vehicle around the circular track is a function of the diameter of the circular track.
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The complete question is below:
A vehicle, starting from rest, accelerates on a circular track with a 335m diameter. What is the distance travelled by the vehicle when it makes one complete cycle?
A truck speed from rest to 120km/h in 13s. Find its acceleration. (convert to m/s)
Answers
answer:
2.5 m/s²
Explanation:
120 km/h = 120 ÷ 3.6 = 100/3 ≈ 33 m/s
a = (v2 - v1)/∆t = (33m/s - 0)/ 13s = 33/13 m/s²≈ 2.5 m/s²
1. A train is moving north at 5 m/s on a straight track. The engine is causing it to accelerate northward at 2 m/s^2.
How far will it go before it is moving at 20 m/s?
A) 83
B) 43
C) 39
D) 94
E) 20
Answers
Answer:
(D) x = 93.8 m
Explanation:
v^2 = v0^2 + 2ax
(20 m/s)^2 = (5 m/s)^2 + 2(2 m/s^2)x
Solving for x,
x = 93.8 m
You are studying in your dorm room, but your neighbor is blasting the television in the adjacent room. When you gently request that your neighbor turn the volume down until you cannot hear it, you are asking your neighbor to make the volume less than your _____.
a. Absolute threshold
b. Perceptual constancy
c. Extrasensory perception
d. Difference Threshold
Answers
The correct Option is a. Absolute threshold.
Absolute threshold is the smallest level of stimulus that can be detected by a person's senses. In this case, you are asking your neighbour to make the volume less than your absolute threshold, which means you are asking them to make the volume so low that you cannot hear it.
Perceptual constancy is the ability of the brain to maintain a constant perception of an object even when it is viewed from different angles or in different lighting conditions. Extrasensory perception is the ability to perceive information through means other than the five senses. Difference threshold, also known as just noticeable difference, is the smallest amount of change in a stimulus that can be detected.
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In ancient wars, heavy rocks are thrown horizontally from the wall as weapons. f the initial speed of a rock is 3 m/s , how many meters will it travel horizontally from a wall 25 meters abov the ground after 2 seconds(neglect air resistance, g=9.8m/s2)
Answers
Answer:
The horizontal distance traveled by the rock from the wall after 2 seconds is 6m.
Explanation:
Given;
initial speed of the rock, u = 3 m/s
height of the wall, h = 25 m
time of travel, t = 2 seconds
The horizontal distance is determined as follows;
X = ut + ¹/₂gt²
where;
g is acceleration due to gravity, horizontal distance is not affected by gravity, g = 0
X = ut
X = 3 x 2
X = 6 m
Therefore, the horizontal distance traveled by the rock from the wall after 2 seconds is 6m.
List different type of thermometer in terms of their thermometer properties
Answers
Answer:
Look below.
Thermometric Property ThermometerVolume expansion of a gas Gas thermometer
Volume expansion of a liquid Laboratory or clinical thermometer
Volume expansion of a solid Bi-metallic strip thermometer
Pressure change of a fixed mass of gas Constant – volume gas thermometer
How are gases different from solids and liquids?
Answers
Answer: All of these states of matter have atoms, molecules, etc. Gases have their molecules all spread out and are not confined to one spot. Liquids and solids both have their molecules in a specific place. For liquid, water, and for solids, an example could be ice. Solids such as ice are tightly packed together and can not move much. Liquids are not packed together as much as solids.
Sorry for the dull explanation.
Explanation:
We used a “dot” to represent the Sun’s location in the picture. Is this dot too small, too large or just the right size to represent the size of the Sun on the picture?
Answers
The dot used to represent the Sun’s location in the picture is too large to represent the size of the Sun on the picture.
1 cm = 10000 light-years
1 mm = 1000 light-years
Dot = 0.5 to 1 mm
Diameter of the Sun = 1.5 * \(10^{-7}\) light-years = 1.5 * \(10^{-10}\) mm
On comparing, the Sun should not be visible to a human eye in that picture. Even using an Electron microscope, we cannot spot the Sun according to the given scale.
A light-year is a measurement of distance. It is the distance travelled by light in one year.
Light speed = 300000 km / s = 9.46 * \(10^{12}\) km / yr
1 light year = 9.46 * \(10^{12}\) km
Diameter of sun = 1.39 * \(10^{6}\) km
Therefore, the dot used to represent the Sun’s location in the picture is too large to represent the size of the Sun on the picture.
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A sharpshooter fires a rifle while standing with the butt of the gun against her shoulder. If the forward momentum of a bullet is the same as the backward momentum of the gun, why isn't it as dangerous to be hit by the gun as by the bullet? (Select all that apply.)
The butt distributes the recoil force over an area much larger than that of the bullet.
The rifle has a much lower speed than the bullet.
The rifle has a much smaller kinetic energy than the bullet.
The rifle has much less mass than the bullet.
The rifle has much more total momentum than the bullet.
Answers
It as dangerous to be hit by the gun as by the bullet because of the following;
(A) The butt distributes the recoil force over an area much larger than that of the bullet.
(B) The rifle has a much lower speed than the bullet.
What is principle of conservation of linear momentum?
The principle of conservation of linear momentum states that in an isolated system, the total momentum of the system is conserved.
That is the sum of the initial momentum is equal to the sum of the final momentum.
momentum of the gun = momentum of the bullet
Mu = mU
where;
M is mass of the gunu is the velocity of the gunm is mass of the bulletU is the velocity of the bulletIf the forward momentum of a bullet is the same as the backward momentum of the gun, the speed of the gun will be smaller than the speed of the bullet since the mass of the gun is bigger than mass of the bullet.
We cannot conclude on the kinetic energy, since it depends on both mass and velocity.
Finally, the butt distributes the recoil force over an area much larger than that of the bullet, since the butt has a larger surface area and will hit more surface area than the bullet.
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Question
Name and write briefly on the international body
that Introduced si units .
Answers
Answer:
International System of Units. it was established in 1960 by the 11the General Conference on Weights and Measures
A negative charge of -6.0x10-6 C exerts an
attractive force of 65 N on a second charge that is
0.050 m away. What is the magnitude of the second
charge?
Answers
The magnitude of the second charge given that the first is –6×10¯⁶ C and is located 0.05 m away is +3.0×10¯⁶ C
Coulomb's law equationF = Kq₁q₂ / r²
Where
F is the force of attraction K is the electrical constant q₁ and q₂ are two point charges r is the distance apart How to determine the second charge Charge 1 (q₁) = –6×10¯⁶ CElectric constant (K) = 9×10⁹ Nm²/C²Distance apart (r) = 0.05 mForce (F) = 65 NCharge 2 (q₂) =?F = Kq₁q₂ / r²
Cross multiply
Fr² = Kq₁q₂
Divide both side by Kq₁
q₂ = Fr² / Kq₁
q₂ = (65 × 0.05²) / (9×10⁹ × 6×10¯⁶)
q₂ = +3.0×10¯⁶ C (since the force is attractive)
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The strength of the magnetic field increases as the size of the current increases.
Which of the following best describes why an electric current fan create a magnetic field?
OA. Magnetism and electricity are part of the same force.
OB. Electricity powers both permanent magnets and electromagnets.
OC. Electric kinetic energy is stored as magnetic potential energy.
OD. Magnetism and electricity are two of the four fundamental forces.
Answers
Answer:
b. they both have permanent magnets and elctromagnetes
Answer:
A) Magnetic and electric are part of the same force - see Maxwell's equations.
What is the key for a successful relationship? and Why?
Answers
Answer:
communication, if you don't talk you'll never know what's going on.
Explanation:
Water which contains large amounts of calcium dissolved within it results from
a) factory sewage outfalls.
b) water dissolving materials in the ground.
c) volcanic activity.
d) increase in number of wells in area.
Answers
Answer: B
Explanation:
The other options have nothing to do with the water apart from transporting it.
Do this question by electric flux
A conducting sphere of radius 10cm has an unknown charge. If the electric field 20 cm from the centre of the sphere is \(1.5*10^{3}\) N/C and points radially inwards what is the net charge on the sphere.
Answers
Answer:
To find the net charge on the sphere using electric flux, we can use the formula:
Φ = Q/ε0
Where Φ is the electric flux, Q is the charge, and ε0 is the permittivity of free space.
Given that the electric field 20 cm from the center of the sphere is N/C and points radially inwards, we can use the formula for electric field due to a charged sphere to find the charge on the sphere:
E = kQ/r^2
Where E is the electric field, k is Coulomb's constant, Q is the charge, and r is the distance from the center of the sphere.
Substituting the given values, we get:
20 = (1/4πε0)(Q)/(0.2)^2
Solving for Q, we get:
Q = (20)(0.2)^2(4πε0)
Q = 0.64πε0 C
Now, substituting this value of Q in the formula for electric flux, we get: Φ = Q/ε0 = (0.64πε0)/(ε0) = 0.64π C
Therefore, the net charge on the sphere is 0.64π C.
Brainlist!! Help!! Atom A consists of 10 protons, 12 neutrons, and 10 electrons.
Atom B consists of 10 protons, 10 neutrons, and 12 electrons.
The atoms are isotopes of each other.
The atoms are not isotopes of each other.
Answers
Atom A has 10 protons, 12 neutrons, and 10 electrons, while Atom B has 10 protons, 10 neutrons, and 12 electrons.
Atom A and Atom B are not isotopes of each other. Isotopes are atoms of the same element that differ in the number of neutrons but have the same number of protons. In this case, Atom A and Atom B have different numbers of protons, which means they are not isotopes of each other.
The number of protons determines the element, and since Atom A and Atom B have different numbers of protons, they belong to different elements.
Isotopes, on the other hand, have the same number of protons but differ in the number of neutrons.
This variation in the number of neutrons gives isotopes different atomic masses while retaining the same chemical properties.
However, Atom A and Atom B do not fulfill this criterion, so they cannot be considered isotopes of each other.
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There are three 20.0 Ω resistors connected in series across a 120 V generator
Answers
Answer:
That is equal to R1 + R2. If three or more unequal (or equal) resistors are connected in series then the equivalent resistance is: R1 + R2 + R3 +…, etc. One important point to remember about resistors in series networks to check that your maths is correct.
Give the name of a suitable material to use for the armature.
Answers
Answer:
Steel
Explanation:
Calculate the de Broglie wavelength of a proton whose kinetic energy is equal to the rest mass energy of an electron. What should be the accelerating potential that need to be applied on an electron so that it has a de Broglie wavelength equal to that of the proton calculated above?
Answers
mvh=1. 654106. 6210=41014m is the de Broglie wavelength of a proton whose kinetic energy is equal to that of the proton.
What is the energy of an electron that has undergone a 100 kV potential difference?An electron has an energy of 100,000 eV (100 keV) at a potential difference of 100,000 V (100 kV), and so on. The energy gained by an ion with a double positive charge when it is accelerated through 100 V is 200 eV.
What is the relationship between kinetic energy and the de Broglie wavelength?De Broglie wavelength is the length of a particle with kinetic energy E. The wavelength changes to /2 when energy E is added to it.
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