After years of observation, Hubble made an extraordinary discovery. In 1923 he spotted a Cepheid variable star in what was known as the Andromeda Nebula. Using Leavitt's techniques, he was able to show that Andromeda was nearly 1 million light years away and clearly a galaxy in its own right, not a gas cloud.
A motor bike is sitting at the start line. It reaches a speed of 90m/s in 10 seconds. Calculate its acceleration.
Answer:
9m/s^2
Explanation:
a= dv/dt, 90m/s-0m/s/10s-0s=9m/s^2
a student pushes a shopping cart filled with groceries. the cart has a mass car of 12 kilograms (kg). The student pushes the cart with a force of 15 newtons (N). Assuming the ground is frictionless, how fast will the cart accelerate until the student stops applying force?
Answer:
the cart will have an acceleration of 1,25 m.s‐²
whats carbond6y12 explain!!
Answer: More info please
Explanation:
describe ohm law with examples
Here is your Answer:-
Ohm's Law
Ohm's law states that the current through a conductor between two points is directly proportional to the voltage across the two points. Introducing the constant of proportionality, the resistance, one arrives at the usual mathematical equation that describes this relationship: I=V/R, where I is the current through the conductor in units of amperes, V is the voltage measured across the conductor in units of volts, and R is the resistance of the conductor in units of ohms.
Conventional Domestic Fans.
Electric Heaters. The electric heaters are the common appliances used in winters throughout the world.
Electric Kettles and Irons. The electric kettle and irons have a lot of resistors in them.
Design of Electric Devices.
If a 3 kg block rests on a rough horizontal table and experienced a 2 N force of static friction then what is the coefficient of static friction between the block and the table
The coefficient of static friction of the block is 0.068.
What is static friction?This is the force between two bodies in contact and tends to oppose their motion. It is also the force that keeps two bodies at rest
To calculate the coefficient of static friction, we use the formula below.
Formula:
F = mgμ............. Equation 1Where:
F = Horizontal forcem = mass of the blockg = acceleration due to gravityμ = coefficient of static friction.Make μ the subject of the equation
μ = F/mg.............. Equation 2From the question,
Given:
m = 3 kgg = 9.8 m/s²F = 2 NSubstitute these values into equation 2
μ = 2/(3×9.8)μ = 2/29.4μ = 0.068.Hence, The coefficient of static friction of the block is 0.068.
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Different Betweens in Self Induced emf and Mutual Induced emf ~
Thank uh☃️
Answer:
brain cells that are in your brain
Explanation:
it has something to do with brain cells
Coulomb’s law is stated mathematically as
F
=
k
q
1
q
2
r
2
where F represents electrical force, k is the electrostatic constant, q represents strength of an electrical charge and r represents the distance between the centers of the charges.
• Explain the relationship between force and strength of electrical charge and the relationship between force and distance, based on this equation.
• Determine how doubling the strength of both charges at the same time affects the force between them.
Relationship between force and strength of electrical charge directly proportional whereas the relationship between force and distance is inversely proportional
Relationship between force, charges and distanceThe relationship between force and strength of electrical charge directly proportional to each other which means if one increases the other will automatically increases whereas the relationship between force and distance is inversely proportional which means that if one increases the other will decrease.
Doubling the strength of both charges at the same time affects the force between them because both charges are directly proportional to its force so we can conclude that relationship between force and strength of electrical charge directly proportional whereas the relationship between force and distance is inversely proportional.
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The SI unit of pressure is _______.
ANSWER:
pascal (pa) or newton per square metre
A 0. 5 kg arrow was shot at a target. The arrow accelerated at 200 m/s2. What was
the net force on the arrow to the nearest newton?
Answer:
100 newtons
Explanation:
F= ma
According to our present theory of solar system formation, why were solid planetesimals able to grow larger in the outer solar system than in the inner solar system?.
Answer:
According to our present theory of solar system formation, why were solid planetesimals able to grow larger in the outer solar system than in the inner solar system? Because only metal and rock could condense in the inner solar system, while ice also condensed in the outer solar system.
Explanation:
_____the form of energy which enables us to see any object is.
Answer:
Light
Explanation:
Light is the form of energy which enables us to see any object.
A 17,250 kg rocket is pushed with a thrust of 7236904 N. What is the acceleration of the rocket?.
The acceleration of the rocket of mass 17250 kg when pushed with a thrust of 7236904 N is 409.73 m/s².
What is acceleration?Acceleration can be defined as the rate of change of velocity
To calculate the acceleration of the rocket, we use the formula below, And this formula is obtained from newton's second law of motion.
Formula:
ma = T-mg.............. Equation 1Where:
m = mass of the rocketa = acceleration of the rocketT = Thrust on the rocketg = acceleration due to gravity of the rocket.Make a the subject of the equation
a = (T-mg)/m............. Equation 2From the question,
Given:
T = 7236904 Nm = 17250 kgg = 9.8 m/s²Substitute these values into equation 2
a = [7236904-(17250×9.8)]/17250a = (7236904-169050)/17250a = 7067854/17250a = 409.73 m/s²Hence, The acceleration of the rocket is 409.73 m/s².
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7. A 500 g ball is about to roll off the edge of a 1. 5 m tall table. What is its current gravitational potential energy?
Answer: 7.35 Joules (7.35J)
Explanation:
Gravitational potential energy is defined to be the "stored" energy in the gravitational field. Since the force of gravity is conservative, the reference point for our zero potential does not matter. For simplicity, the zero reference point will be the floor which the table is sitting on. Gravitational potential energy is denoted as a capital 'U' and is defined to be:
[tex]U=mgh[/tex]
The 'm' is the mass, the 'g' is the acceleration due to the gravitational field, and the 'h' is the vertical height from the reference point. Plugging in the given values, you get:
[tex]U=(0.5kg)(9.8m/s^2)(1.5m)[/tex]
[tex]U=7.35J[/tex]
The SI units for mass is always the kilogram. So, you need to convert the grams into kilograms using the conversion factor of 1000g = 1kg.
HEYY! Please help!
Turn this Algebraic expression into a Verbal expression!
2(3j+5+8j)
Thank you! <33
Answer:
22J+10
Explanation:
that is it in verbal expression
A jet is flying at a velocity of 30m/s. It speeds up to 150m/s in 40s.
Calculate its acceleration.
Answer:
acceleration= Final velocity - initial velocity/time taken
or u can put the formula by their symbols
a= V-u/t
a=150m/s - 30m/s= 120
120/40s= 3s
so the answer is 3s.
an object moving at 10 km/h has a kinetic energy of 10 J. what is the kinetic energy of the same object if it is moving at 20 km/h
KE = 1/2 mv²
v = 10 km/h = 2.78 m/s
v = 20 km/h = 5.56 m/s
10 = 1/2 m . 2.78²
m = 2.59 kg
KE = 1/2 x 2.59 x 5.56²
KE = 40.03 J
A circuit contains a 1. 5 volt battery and a bulb with a resistance of 3 ohms. Calculate the current
A common activity like cooking a meal can use many natural _________.
A common activity like cooking a meal can use many natural Ingredients
Ingredients
Ingredients are substances combined to make a particular mixture such as a meal. most of the ingredients used for the preparation of a meal are sourced naturally.
In cooking different recipes of a meal the use of specific ingredients for each recipe differentiates the recipes.
Therefore we can conclude that cooking a meal requires the use of natural ingredients.
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good morning! can someone please answer this, ill give you brainliest and you will earn 50 points.
How demands became the obstacles ?
The demands forces the human to go to different places in order to fulfill their requirements .So they have to shift their homes to different places .Pick all of the statements that are correct
Natural resource supplies depend solely on physical availability
Demand for natural resources have influenced human settlement patterns ✓
More the resources,more the fraction of the population living near that areaClean air, clean water, and food are examples of natural resources
we get air from the atmosphere, water from hydrosphere and food from the lithosphere and all of them are natural resourcesWhen floating a ping-pong ball with a hairdryer, which two forces are balanced?
Force pushing up:
Force pulling down:
rearrange the equation d=vt-1/2at^2 to find v
Explanation:
This is the formula for the change in distance (δx) of an object moving with constant acceleration (a) and initial velocity (v), one of the standard Equations of motion. To solve for t first rearrange
12at2+vt−δx=0
then apply the formula for solving a Quadratic equation if our equation is At2+Bt+C=0 then the solution is
t=−B±B2−4AC√2A,
here A=12a, B=v, C=−δx so plugging these in the formula gives
t=−v±✓v2−4(12a)(−δx)√2(12a) (Apply quandriatic equation)
simplifying
t=−v±v2+2aδx√a.
Note how there are two possible solutions one corresponding to the + and one to the -. Sometimes one of these will give a negative time, so you may want to eliminate that. Indeed if δx>0, v>0 and a>0 we only want the positive solution. In other cases you may want to consider both solutions, for instance if we thow a ball up in the air the initial velocity is positive and the acceleration is negative, it will pass a fixed height above your head twice, once on the way up and once on the way down.
help.
Help help help help
Answer:
B. 1.750 x 10^3
Explanation:
1/2 * 35 * 10^2
State Coulomb’s Law equation and give the meaning of every variable and the units.
The Coulomb's law equation is F = Kq₁q₂/r².
What is Coulomb's law?This is the law that relates the product of two charges to the square of distance between the two charges.
Coulomb's law states that the force of attraction or repulsion is directly proportional to the product of the charges and inversely proportional to the square of distance between the charges.
Coulombs' law equationThe equation of Coulomb's law is given as;
F = Kq₁q₂/r²
where;
K is Coulomb's constant, Nm²/C²q₁ is the first charge, Cq₂ is the second charge, C)r is the distance between the charges, mThus, the Coulomb's law equation is F = Kq₁q₂/r².
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A plane makes a complete circle with a radius of
3622 m in 2.10 min. What is the speed of the plane?
Answer:
10
Explanation:
The magnitude of the electric field between two parallel charged plates is 200. An electron moves to the negative plate 5. 0 cm away. Two horizontal parallel plates have equally spaced vectors going from the top plate to the bottom plate labeled E and the plates are spaced a distance d apart. There is a negatively charged sphere is near the positively charged plate and a second is directly below and near the negatively charged plate. The two charged particles are connected by a dashed line vector point from the top to the bottom one. Find the electric potential difference and the work. Recall the charge of an electron is 1. 602 × 10–19 C. ΔV = V Round work to one decimal. W = × 10–18 J.
The potential difference between the two ends of the circuit is the electric potential difference. The electric potential difference and the work will be 10V and 1.6 x 10^-18 J respectively.
What is an electric field?An electric field is an electric property that is connected with any location in space where a charge exists in any form. The electric force per unit charge is another term for an electric field.
The given data in the problem is given by;
E is the electric field = (200 N/C)
d is the distance = 5.0 cm.=0.05 m
Q is the charge of electrons= 1.602 x 10^-19 C
The formula for electric potential is given by;
[tex]\rm V=Ed[/tex]
[tex]\rm V=Ed \\\\ \rm V=200 \times 0.05 \\\\ \rm V= 10 \frac{Nm}{C} = 10 \frac{J}{C} = 10 V.[/tex]
The work is defined as the product of the potential difference and charge of an electron.
[tex]\rm W= 10 \times 1.602 x 10^{-19} \\\\\ \rm W= 1.6 x 10^{-18 }J[/tex]
Hence the electric potential difference and the work will be 10V and 1.6 x 10^-18 J respectively.
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first part is 10 second part is 1.6
What do all scientific areas of study have in common?
Answer:
They examine theories in a systematic manner.
Explanation:
Charge q1 = 7. 5 nc is located at the coordinate system origin, while charge q2 = 1. 5 nc is located at (a, 0), where a = 1. 1 m. The point p has coordinates (a, b), where b = 2. 6 m
The electrical field along the horizontal axis is 3.36N/C and the 8.11N/C along the vertical axis
Data;
q1 = 7.5nCq2 = 1.5nCa = 1.1mb = 2.6mElectrical Field ForceThe electrical field force is given as
[tex]E = \frac{kQ}{r^2}[/tex]
The distance apart will be
[tex]r = \sqrt{1.1^2 + 2.6^2} = 2.8m[/tex]
Let's find E1 and E2
E1 will be
[tex]E_1 = \frac{-9*10^9 * 7.5*10^-^9}{2.8^2} = -8.61N/C[/tex]
E2 will be
[tex]E_2 = \frac{-9*10^9*1.5*10^-^9}{2.8^2} = -1.72N/C[/tex]
Let's find the angle between the charges
[tex]tan\theta = \frac{2.6}{1.1} \\\theta = 67.04^0[/tex]
The value E12
[tex]E_1_2 = |E|cos\theta = 8.61(cos67.04) = 3.36N/C[/tex]
The value of E21 = 0
The value of electrical field along the horizontal axis
[tex]E_x = 3.36 N/c[/tex]
The value along the vertical axis
[tex]E_1_y = -|E_1|sin \theta = -7.93 N/C\\E_2_y = E_2 sin 90^0 = -1.72N/C\\E_y = \sqrt{7.93^2 + 1.72^2}= 8.11N/C[/tex]
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Describe the key features of the national grid, explaining why electricity is transmitted in this way.
The National Grid network is made of high-voltage power lines, gas pipelines, interconnectors, and storage facilities that together enable the distribution of electricity. The grid ensures that all areas of Said country have power/gas/oil products. this also allows more efficient power generators like nuclear plants to contribute more to the power grid than just where they are located.
How does the interference of sound waves make sounds louder of softer?
Answer:
Explanation:
Lower pitch Normal pitch Sound Interference If you walk through a room with stereo speakers at each end, the sound might seem louder in some places and softer in others. The waves from each speaker interact with one another. Interference occurs when waves that overlap combine, forming a new wave.
What is the unit of measurement used for Electric Potential difference?
Answer:
e. V
Explanation:
Electric potential is the amount of work needed to move a unit charge from a reference point to a specific point against an electric field.
In the SI, the units are Volts denoted by the letter V, in honor of Alessandro Volta
Option E is the correct answer