Explanation:
F=GMm/d^2
Distance between friends and us <<<<<Distance between centre of earth and us
what is lighting write its causes
Answer: lightning is the occurrence of a natural electrical discharge of very short duration and high voltage between a cloud and the ground or within a cloud, accompanied by a bright flash and typically also thunder.
the causes of lightning:
Lightning happens when the negative charges (electrons) in the bottom of the cloud are attracted to the positive charges (protons) in the ground.
In the early stages of development, air acts as an insulator between the positive and negative charges in the cloud and between the cloud and the ground. When the opposite charges build up enough, this insulating capacity of the air breaks down and there is a rapid discharge of electricity that we know as lightning.
Solar energy can be directly converted to elec-trical energy by which of the following de-vices?
Answer: (c) solar cell
Explanation:
Sand and salt are poured into a single beaker. The result is a mixture because_____?
Answer:
Sand and salt are poured into a single beaker. The result is a mixture because they can be separated by simple and easy physical means.
Explanation:
Mixture : Properties :
They are put in a indefinite proportion.They are physically mixed with each other.They can be separated by physical and easily methodsConstituents retain their own propertiesNow let us see these in the perspective of the question :
We could have put more of salt and less of sand, still it would not have become a compound. We had poured it into a single beaker with some physical means.We can use sedimentation and evaporation to separate them. After separating them, the will retain their own properties, it is not that the salt will become bitter or the sand will start not allowing the water to flow through it.These are some few reasons why these getting mixed, becomes a mixture, and we can choose any one point of the properties of mixture and give the answer.
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An athlete needs to get across a river. She must reach from point A on one bank to point B, which is directly across from point A on the opposite bank. If she wishes to minimize the total time T it would take to do so, at what angle upstreams (measured from the line AB) should she swim? Let her swimming/rowing speed relative to the water be 2.0 mi/h, and her running speed along the bank be 5 mi/h. The river flows downstream at 1.5 mi/h. (The rule of the competition stipulates that the athletes must swim first from point A, then run to reach point B.)
Answer:
θ = 90°
Explanation:
Speed at which she can swim in stationary water; v_m = 2 mi/h
Speed at which the river is flowing downstream; v_r = 1.5 mi/h
This can be illustrated in a form of triangle as attached. Where θ is the angle to the x-axis.
With respect to the bank of the river, the total speed of the girl is;
V_R = v_r + v_m
Now the horizontal component is;
V_R = v_r + v_m(cos θ)
While the vertical component is;
V_R = v_m(sin θ)
Now, the total time taken to get across the river is;
T = width of river/vertical component of total speed
Let's denote width of river as d.
Thus;
T = d/(v_m(sin θ))
Now, we are told she wishes o minimize the total time(T) .
Since the width(d) of the river is constant, and v_m is fixed, then it means the only variable we have is the angle θ.
Now, for the total time to be minimized, the denominator has to be at maximum.
Since angle θ is the only one that is variable, we have to find the value of angle θ that will make sin θ to be at a maximum value.
Now, for sin θ to be maximum, it means it has to be equal to 1.
Thus, θ = sin^(-1) 1
θ = 90°
2
In 1987, the fastest auto race in the United States was the Busch Clash in Daytona, Florida. That year, the
winner's average speed was about 318 km/h. Suppose the kinetic energy of the winning car was 3.80 MJ. What
was the mass of the car and its driver?
Since the winner's average speed was about 318 km/h and the kinetic energy of the winning car was 3.80 MJ. So, the mass of the car and its driver is 974 kg.
Kinetic energyThe kinetic energy of the car is given by K = 1/2mv² where
m = mass of car and driver and v = average speed of car = 318 km/h = 318 × 1000 m/3600 s = 88.33 m/sMass of the car and driverMaking m subject of the formula, we have
m = 2K/v²
Since K = 3.80 MJ = 3.80 × 10⁶ J, substituting the values of the variables into the equation, we have
m = 2K/v²
m = 2 × 3.80 × 10⁶ J/(88.33 m/s)²
m = 7.6 × 10⁶ J ÷ (7802.78 m²/s²)
m = 7600000 J ÷ 7802.78 m²/s²
m = 974.01 kg
m ≅ 974 kg
So, the mass of the car and its driver is 974 kg
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If the period of a wave is 20 s, then what is its frequency?
a girl on a bridge throws a rock straight down at -12.5 m/s. it hits the ground 38.4 m below. How much time did it take?
[tex]\\ \rm\rightarrowtail s=ut+\dfrac{1}{2}gt^2[/tex]
[tex]\\ \rm\rightarrowtail 38.4=12.5t+4.9t^2[/tex]
On solving further we get
t=1.8sA girl on a bridge throws a rock straight down at -12.5 m/s.the time required to hit the ground 38.4 m below is 4.35 s.
Given:
Speed, u = -12.5 m/s
Distance, d = 38.4 m/s
There are three equations of motion present. For the given question, we will use the second equation of motion.
The second equation of motion helps in the determination of velocity, time, and distance. For the given question, we have initial velocity, and distance, to find time we can use the second equation of motion.
From the second equation of motion:
[tex]s = ut + 1/2 at^2\\38.4 = -12.5t - 9.8/2* t^2\\\4.9t^2 - 12.5 t -38.4 = 0[/tex]
Solving the equation, the required time is:
[tex]t = 4.35 s[/tex]
Hence, the time required to hit the ground 38.4 m below is 4.35 s.
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The Earth rotates once every day. What is the velocity of a person on its surface, if the radius of Earth is 6 million meters
Answer:
v = ω R
number of seconds in 24 hrs = 24 * 3600 = 86400 s / da = T (period)
f = 1 / T
ω = 2 Π f = 2 Π / T = 2 Π / 86400
v = 2 Π / 8.64E4 * 6.0E6 = 436 m / s
Check:
S = 2 Π * 6.0E6 = 3.77E7 m/da
S / T = 3.77E7 m/da / 8.64E4 s/da = 436 m / s
A student is moving a magnet through a coil of wire. Which of these indicates the strength of the electric current in the coil?
Answer:
Can you help me with another question
Explanation:
The electric current in the coil depends on changes in the magnetic field of the magnet.
Electricity is generated when there is relative motion between a conductor and a magnetic field. As the magnet is being moved through the coil of wire, the magnetic flux around the conductor changes and current is induced on it.
Hence, the strength of the electric current in the coil is determined by changes in the magnetic field of the magnet.
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How does the organization know what their needs and expectations are ?
Answer:
When scientific knowledge changes overtime, it can be to anything at anytime. The Explosion in what we know about life form is important and change because we might have a plant we can’t touch or something like that. That is not the only thing that is important about how scientific knowledge change over time it is also the food pyramid. We know that especially The Explosion in What We Know About Life Forms, is because there might be like a new plant we can’t touch because say it is potions or something. According to the life forms article people are wondering if scientist have found all the living species on earth yet
Explanation:
1) A pile driver with mass 1x10⁴ kg strikes a pile with velocity 10.0 m/s. What is the kinetic energy of the driver as it strikers the pile?
Explanation:
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How can you strengthen the magnetic force of an electromagnet? (check all that apply)
(I'M TAKING TEST PLEASE HELP)
A. Increase the voltage of the battery attached to the electromagnet.
B. Increase the wire coils wrapped around the metal core.
C. Spread out the wire coils wrapped around the metal core.
D. Increase the number of batteries attached to the electromagnet.
1 wrapping the coil around a piece of iron (such as an iron nail)
2 adding more turns to the coil.
3 increasing the current flowing through the coil.
QUESTION 4
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If a car is moving at 37 km/h for 42 min, what is the distance that the car has traveled. (Give your answer in terms of meters and round to
the nearest whole number.)
Answer:
s=25956m
Explanation:
first 37 km/h is 10.3 m/s
then 42 min is 2520s
finally s=vt => s=2520s*10.3m/s
s=25,956m
Answer:
25956
Explanation:
Convert 37km/h to m/s =10.3m/s
Where s=vt
S=10.3×2520
S=25,956
S=25,000
1. You set the thermostat in your house to 70 degrees so that when it goes above that temperature the air conditioner will turn on. What is the feedback of this system? 2. You set the thermostat in your house to 70 degrees so that when it goes above that temperature the air conditioner will turn on. What is the input of this system?
PLEASE HELP
Answer:
Negative Feedback...... Temperature
Explanation:
as the Temperature increase more than the set point the air conditioner turn on to lower the temperature so that means it is Negative feedback because it is not INHANCING the temperature
Input should be Temperature or Heat because AC turns on when the temperature is getting above 70 degrees
NOW WHERE IS MY BRAINLIESTTTT
Which of the following statements about charging objects is FALSE. Select one: If an object gains electrons it becomes positively charged. If an object gains electrons it becomes negatively charged. Charges cannot travel in an insulator. Charges can travel in a conductor.
Answer:
If an object gains electrons it becomes positively charged.
Explanation:
Electrons negatively charge.
Condition when an organ is impaired sickness
Answer:
As traditionally used, impairment refers to a problem with a structure or organ of the body; disability is a functional limitation with regard to a particular activity; and handicap refers to a disadvantage in filling a role in life relative to a peer group.
Explanation:
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Amanda has started running as her primary form of exercise, but she's getting bored with it and finds excuses to procrastinate. It's also getting really hot outside now that it's summer, and Amanda's skin is sensitive to the sun. She has a significant budget available to help her fix the problem but is unsure how to spend the money.
What might be the most appropriate purchase for Amanda?
ANSWER please ⬆️⬆️⬆️ correctly! GIVING OUT BRAINLY STARS!!!
Answer:
: An app thr features menu planning with healthy recipes and pairs with a calorie tracking tool
Electric field lines moves away from positive to wards negative?
The vector force on the unit positive charge placed at any location in the field defines the strength of the electric field at that point. The charge used to determine field intensity (field strength) is known as the test charge. Now, a field line is defined as a line to which the previously mentioned field strength vectors are tangents at the relevant places. When we study positive charge field lines, the field strength vectors point away from the positive charge. If there is a negative charge anywhere in the vicinity, the field lines that began from the positive charge will all terminate at the negative charge if the value of the negative charge is the same as the value of the positive charge. Remember that the number of field lines originating from positive charge is proportional to the charge's value, and similarly, the number of field lines terminating at negative charge is proportionate to the charge's value. As a result, if all charges are equivalent, all lines originating from the positive charge terminate at the negative charge. If the value of the positive charge is greater than the value of the negative charge, the number of lines ending at the negative charge will be proportionally less than the number of lines beginning at the positive charge. The remaining lines that do not end at the negative charge will go to infinity. If the positive charge is less, all lines from it terminate at a negative charge, and any other reasonable number of ines terminate at a negative charge from infinity. We should also keep in mind that the number of lines that run perpendicular to the field direction across a surface of unit area is proportional to the field strength at that location. As a result, lines are dense in the strong field zone and sparse in the low intensity region.
WHO WANTS BRAINLY? PLEASE ANSWER THIS PHYSICS QUESTION!
force of 187 N acts on a 7.3 kg bowling ball for 0.40 s.
1. What is the change in momentum of the ball?
2. What is its change in velocity?
Change in momentum of the ball is 74.8 kg m/s
change in velocity of the ball is 0.25 m/s
What is change in momentum?
Change in momentum is the product of mass and change in velocity this is also equal to impusle which ia a product of force and time.
Change in momentum = m ( v - u ) = Impulse = f * t
m = mass
change in velocity = v - u
v = final velocity
u = initial velocity
f = force
t = time
Given:
f = 187 N
m = 7.3 kg
t = 0.40 s
!.
Change in momentum = impulse = f * t
Change in momentum = 187 * 0.40
Change in momentum = 74.8 kg m/s
2.
Change in momentum = m * ( v - u )
( v - u ) = change in momentum / m
( v - u ) = 187 / 7.3
( v - u ) = 10.25 m/s
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What occurs during stage one sleep
Answer:
Stage one of sleep, also known as the transitional phase, occurs when one finds themselves floating in and out of consciousness. During this NREM stage, you may be partially awake while your mind begins to drift off. This period of drowsiness eventually leads to a light sleep
Explanation:
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What is the final velocity of a drag racer that has constant acceleration and finishes a
1/4 mile race in 15 seconds?
Answer:
120 mph
Explanation:
Given:
Δx = 0.25 mi
v₀ = 0 mi/s
t = 15 s
Find: v
Δx = ½ (v + v₀) t
0.25 mi = ½ (v + 0 mi/s) (15 s)
v = 0.0333 mi/s
v = 120 mi/h
A skydiver has a mass of 80 kg. When she is at a height of 900 m, her GPE is
705,600 J. She is falling at a velocity of 32 m/s downward. What is her ME at this
point?
Answer:
11.25 J
Explanation:
GPE=wxh=80kg over 900m=11.25 J
A transformer has 500 volts applied to the primary side and 10,000 volts are measured
on the secondary side. If 10mA is applied to the primary side. What is the anticipated
current on the secondary side? Is this a step-up or step down transformer?
Answer:
0.5 mA, step-up transformer
Explanation:
Power is constant
V * I = constant
500 V * 10 mA = 10,000 V * I
so I = 0.5 mA
From 500 V increases to 10,000 V, so it is a step-up transformer
Where is the stigma located?
Answer:
At the tip of the pistil
Explanation:
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5. Use the algebraic technique for adding vectors to find the total displacement of a person who walks the following three paths (displacements-on a flat field. First, she walks 25.0 m in a direction 49.00 north of east. Then she walks 23.0 m heading 15.00 north of east. Finally, she turns and walks 32.0 m in a direction 68.0° south of east.
Answer:
jjjjjjjjjjjjjjjj
Explanation:
Two Earth satellites, A and B, each of mass m = 940 kg , are launched into circular orbits around the Earth's center. Satellite A orbits at an altitude of 4500 km , and satellite B orbits at an altitude of 11100 km .
c) How much work would it require to change the orbit of satellite A to match that of satellite B?
Answer:
The required work done is [tex]6.5\times10^{9}\ J[/tex]
Explanation:
Given that,
Mass of each satellites = 940 kg
Altitude of A = 4500 km
Altitude of B = 11100 km
We need to calculate the potential energy
Using formula of potential
[tex]U_{A}=-\dfrac{Gm_{A}m_{E}}{r_{A}}[/tex]
Put the value into the formula
[tex]U_{A}=-\dfrac{6.67\times10^{-11}\times940\times5.98\times10^{24}}{6.38\times10^{6}+4.50\times10^{6}}[/tex]
[tex]U_{A}=-3.44\times10^{10}\ J[/tex]
We need to calculate the potential energy
Using formula of potential
[tex]U_{B}=-\dfrac{Gm_{B}m_{E}}{r_{A}}[/tex]
Put the value into the formula
[tex]U_{B}=-\dfrac{6.67\times10^{-11}\times940\times5.98\times10^{24}}{6.38\times10^{6}+11.10\times10^{6}}[/tex]
[tex]U_{B}=-2.14\times10^{10}\ J[/tex]
We need to calculate the value of [tex]k_{A}[/tex]
Using formula of [tex]k_{A}[/tex]
[tex]k_{A}=-\dfrac{1}{2}U_{A}[/tex]
Put the value into the formula
[tex]k_{A}=\dfrac{1}{2}\times3.44\times10^{10}[/tex]
[tex]k_{A}=1.72\times10^{10}\ J[/tex]
We need to calculate the value of [tex]k_{B}[/tex]
Using formula of [tex]k_{B}[/tex]
[tex]k_{B}=-\dfrac{1}{2}U_{B}[/tex]
Put the value into the formula
[tex]k_{B}=\dfrac{1}{2}\times2.14\times10^{10}[/tex]
[tex]k_{B}=1.07\times10^{10}\ J[/tex]
We need to calculate the work done
Using formula of work done
[tex]W=\Delta K+\Delta U[/tex]
[tex]W=(k_{B}-k_{A})+(U_{B}-U_{A})[/tex]
[tex]W=(-\dfrac{U_{B}}{2}+\dfrac{U_{A}}{2})+(U_{B}-U_{A})[/tex]
[tex]W=\dfrac{1}{2}(U_{B}-U_{A})[/tex]
Put the value into the formula
[tex]W=\dfrac{1}{2}\times(-2.14\times10^{10}+3.44\times10^{10})[/tex]
[tex]W=6.5\times10^{9}\ J[/tex]
Hence, The required work done is [tex]6.5\times10^{9}\ J[/tex]
Please Help Me
When you apply brakes on a bicycle, the bicycle’s ________________________
energy is not destroyed; instead, the bicycle’s _____________________energy is
transformed into thermal energy. The __________________amount of energy remains the same.
Answer:
1. Acceleration begins to slow down quickly
2. Kenetic
3. Mass
Answer:
Acceleration slows down
Kinetic
Mass
Explanation:
A large toy car has a mass of 15 Kg and is pushed horizontally with a force of 2 N. Assume friction is so small it can be ignored. What is the acceleration?
Answer:
0.133 m/s²
Explanation:
F=ma
F is force
m is mass
a is acceleration
F=ma
2=15.a
a=2/15
a=0.133 m/s²
A boulder of mass 4 kg rolls over a cliff and reaches the beach below with a velocity of 20 metres per second minus 1.
what is the kinetic energy of the boulder when it lands?
what is the potential energy on the cliff?
How high is the cliff??
Given:-
Mass of boulder = 10kg
Final Velocity = 15m/s
Acceleration due to gravity = +10m/s
To Find:-
The kinetic energy of the boulder as it lands
The potential energy of the boulder when it was at the top of the cliff
The height of the cliff
Formulae used:-
Kinetic energy = mv²/2
Potential energy = mgh
Now,
We will first find the Kinetic enrgy,
→ K. E = ½mv²
→ K. E = ½ × 10 × (15)²
→ K. E = 5 × 225
→ K. E =1125J
But we know that when the body starts moving the Potential enrgy of the body starts Converting into Kinetic enrgy. Before reaching to the last spot it has equal kinetic energy and Potential energy.
Therefore,
→ mgh = 1125J
The Potential enrgy of the boulder when it was on top is 1125J
Now,
→ mgh = 1125J
→ 10 × 10 × h = 1125J
→ 100h = 1125J
→ h = 1125/100
→ h = 11.25m
Hence, The Height of the Cliff is 11.25m
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Which particles have more speed: Solid or Liquid? Why?