1. Astronomical observatories have been available since ancient times, and many cultures set aside special sites for astronomical observations. The thing modern observatories have that was missing from these older observatories until about 1610 was: a. a dark site, where lights did not get in the way b. graduate students or other assistants for sharing the astronomer’s work c. a method of keeping good records d. a way of measuring from what general direction in the sky a beam of light was coming e. telescopes
Answer:
e telescopes
Explanation:
may i be marked brainliest?
If the resistance of an electric iron is 40 and a current of 2.2 A flows
through the resistance. Find the voltage between two points. *
Answer:
88 volts
Explanation:
Ohm's law gives the formula : I = V/R
In this case, since we are solving for voltage, you simply rearrange the equation to be : V = I * R
Therefore, given the resistance and current, you just plug in the numbers.
Voltage = 40 ohms * 2.2 amperes
Voltage = 88 volts
Light refracts when it
help please physics !!
Answer:
Option A. 1 bar = 1 atm
Explanation:
Pressure has various units of measurement. Each unit of measurement can be converted to other units of measurement. For example:
1 atm = 1 bar
1 atm = 760 mmHg
1 atm = 760 torr
1 atm = 1×10⁵ N/m²
1 atm = 1×10⁵ Pa
With the above conversion scale we can convert from one unit to the other.
Considering the question given above, it is evident from the coversion scale illustrated above that only option A is correct.
Thus,
1 bar = 1 atm
If a car is traveling 60 miles per hour, how far will it travel in one hour?
Answer:
60 miles
I hope it's helps you
Answer:
316800 feet or 60 miles per hour
Explanation:
it is already said in the problem 60 miles per hour
Compare and contrast the health benefits and the amount of physical or mental energy needed between active leisure activities and passive leisure activities
Answer:
Q...Compare and contrast the health benefits and the amount of physical or mental energy needed between active leisure activities and passive leisure activities.
A..Some active leisure activities, such as yoga and running, require a great deal of physical energy, while other activities, like playing chess, require a substantial amount of mental energy. Passive leisure activities, such as watching TV or going to the movies, require little to no physical or mental energy. Because of the exertion of physical or mental energy, active leisure activities have more health benefits than passive leisure activities.xplanation:
HELP ME ASAP ITS PHYSICS AND it’s finding the kinetic energy SHOW WORKKK
k = 1/2 × m × v^2
_____________________________
1. k = 1/2 × 60 × ( 10 )^2
k = 30 × 100
k = 3000 j
_____________________________
2. k = 1/2 × 60 × ( 9 )^2
k = 30 × 81
k = 2430 j
_____________________________
3. k = 1/2 × 60 × ( 4 )^2
k = 30 × 16
k = 480 j
_____________________________
4. k = 1/2 × 60 × ( 6 )^2
k = 30 × 36
k = 1080 j
______________________________
5. k = 1/2 × 60 × ( 0 ) ^2
k = 30 × 0
k = 0 j
the ans is like this
1 4
2 5
3
una llamada telefonica a brasil de 4 minutos costo el mes pasado 2430 si el valor por minuto se mantiene cualto debo pagar por una llamada de 6 minutos a ese pais
Answer:
Costo = 3645
Explanation:
Dados los siguientes datos;
Costo de la llamada = 2430
Duración = 4 minutos
En primer lugar, encontraríamos el costo por minuto;
Costo por minuto, Cpm = 2430/4
Cpm = 607.5
A continuación, para encontrar el costo de 6 minutos;
Costo = 607,5 * 6
Costo = 3645
Electromagnets are used in to produce a rotating magnetic field that turns a rotor.
A) TVs
B) computers
C) generators
D) motors
Answer:
A motor
Explanation:
(I'm not that good in physics but from what I know it might be motor or generator, I'm not 100% sure on this answer)
[tex]\huge\mathfrak\purple{hello...} \\ \\ \huge\mathfrak\green{what \: is \: energy} \\ \\ \huge\mathfrak\pink{asap \: please \: }[/tex]
Energy is "the ability to do work". Energy is how things change and move. It takes energy to cook food, to drive to school, and to jump in the air. Different forms of Energy. Energy can take a number of different forms.
Find the voltage across the 15 Q resistor.
[?] V
No links please
Answer:
Explanation:
same idea as before Liam, first, find the parallel resistance in 35 || 20
(35*20) / (35+20) = 700 / 55 = 12.727272 ohms
now add the 12.727272 + 15 = 27.727272 ohms total resistance
V = IR
10 = I * 27.727272
10 / 27.727272 = I
0.360655 = I
V = IR (again, but across the 15 ohm resistor)
V = 0.360655 * 15
V = 5.4098
Stored energy and the energy of position is the definition?
Answer:
Potential energy is energy that is stored-or conserved-in an object or substance. This stored energy is based on the position, arrangement or state of the object or substance
The Playground
A and G are at same height and where
skateboarder starts
E
A
G
ao oon
E
С
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F
D
O meters
List in order from greatest to least the Kinetic energy from greatest to least.
Drag the boxes in the correct order
1
1
DDDDDD
Three resistors of values 2 Q, 3 Q and 5 Q are connected in series with a battery of voltage 6.0 V. Calculate the current through each of the resistors, and the current through the battery.
Answer:
Current = 0.6 A
Explanation:
Given that,
Three resistors 2 ohms, 3 ohms and 5 ohms are connected in series with a battery of voltage 6 V.
In series combination of resistors, the current through each resistor is the same while the voltage divides.
The equivalent resistance in this case is given by :
[tex]R_{eq}=R_1+R_2+....[/tex]
Put all the values,
[tex]R_{eq}=2+3+5\\\\R_{eq}=10\ \Omega[/tex]
Let I be the current. Using Ohm's law,
[tex]V=IR\\\\I=\dfrac{V}{R}\\\\I=\dfrac{6}{10}\\\\I=0.6\ A[/tex]
So, the current through each resistor and the current through the battery is equal to 0.6 A.
I need help with this assignment please
Answer:
ill try
Explanation:
let me find this answer for you
A 2.0 kg 2.0kg2, point, 0, start text, k, g, end text cart moving right at 5.0 m s 5.0 s m 5, point, 0, start fraction, start text, m, end text, divided by, start text, s, end text, end fraction on a frictionless track collides with a 3.0 kg 3.0kg3, point, 0, start text, k, g, end text cart initially at rest. The 2.0 kg 2.0kg2, point, 0, start text, k, g, end text cart has a final speed of 1.0 m s 1.0 s m 1, point, 0, start fraction, start text, m, end text, divided by, start text, s, end text, end fraction to the left. What is the final speed of the 3.0 kg 3.0kg3, point, 0, start text, k, g, end text cart?
The final speed of the 3.0 kg cart is 4 m/s.
What is conservation of momentum principle?When two bodies of different masses move together each other and have head on collision, they travel to same or different direction after collision.
The external force is not acting here, so the initial momentum is equal to the final momentum. For elastic collision, final velocities is different for both the bodies.
m₁u₁ +m₂u₂ = m₁v₁ +m₂v₂
A 2.0 kg cart moving right at 5.0 m/s on a frictionless track collides with a 3.0 kg cart initially at rest. The 2.0 kg cart has a final speed of 1.0 m/s to the left.
Substitute the values for m₁ = 2kg, m₂ =3kg, u₁ =5 m/s and u₂ =0 m/s, then the final velocity will be
3x0 +2x5 = -2x1 + 3v₂
v₂ = 4 m/s
Thus, the the final velocity 3.0 kg cart is 4 m/s.
Learn more about conservation of momentum principle.
https://brainly.com/question/14033058
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Two positive charges are placed near each other what happens between the charges
Answer: coll
Explanation:
Answer: coll
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Answer: coll
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Answer: coll
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Answer: coll
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Answer: coll
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Answer: coll
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Answer: coll
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Answer: coll
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Answer: coll
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Answer: coll
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Answer: coll
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Answer: coll
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Answer: coll
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Answer: coll
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Answer: coll
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Answer: coll
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Answer: coll
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Answer: coll
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Answer: coll
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Answer: coll
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Answer: coll
Explanation:
state two environmental problems caused by coal fired power stations
Answer:
Air pollution and water pollution.
Explanation:
The burning of coal causes air pollution, and coal fired power stations dump waste in large bodies of water.
HELP PLZZZ I will give brainliest to who ever helps me the fastest plzzzzzzzz.
Answer: space race automobiles
Explanation:
they were used in space to get to planets
What is a conceptual model?
A. An image that helps you understand something complicated
B. A mathematical formula that helps you describe something
C. A computer that can make predictions about something
D. An object that looks just like something you are studying
Answer:
D
Explanation:
A conceptual model is a representation of a system, made of the composition of concepts which are used to help people know, understand, or simulate a subject the model represents.
There are 2 ways of collecting the sun’s energy. What are they? Give an example of each.
2.List two changes an unbalanced force can cause.
Answer:
By applying an unbalanced force, you can change the motion of an object. Unbalanced forces can make an object at rest start moving, make a moving object stop, or change the direction and speed of the object.
Explanation:
why did the united states and the soviet union begin experimenting with and trying to improve the v-2 rocket ?
Answer:
To Increase National Security
Explanation:
1 Newton = 1,,,,,,,,
Answer:
kg*m/2
Explanation:
hope this helps just did it
Answer:
c
Explanation:
A car was traveling at a certain speed. It then accelerates for 5.0 s with an acceleration of 1.6 m/s2, and reaches a speed of 20 m/s. What was its initial speed?
I will give u a brainest
Answer:
12m/s
Explanation:
To find the initial speed of the car, we need to find the how much it accelerated/increased in speed and then subtract it from its final speed.
We can do this by using the equation: [tex]a=\frac{\Delta v}{t}[/tex]
Which we can rearrange to find change in velocity: [tex]\Delta v=at[/tex]
The given acceleration is 1.6m/s^2, and the time is 5s. Therefore the car's change in speed was [tex]\Delta v = (1.6)(5)\\\Delta v = 8m/s[/tex]
Since the final speed was 20m/s, we can now simply subtract the change in speed to find the initial speed:
20 - 8 = 12
The initial speed of the car was 12m/s.
Hope this helped!
EASY BRAINLIEST PLEASE HELP!!
-if you answer correctly ill give you brainliest which will give you 100pts-
(if you put links or don't answer accordingly im reporting your account)
Answer:
I think the awnser is B (but don't qoute me on that) if its right then yay but if its wrong im sorry
Explanation:
Answer:
Solution given:
frequency[f]=x
velocity[V]=15000m/s
wave length=59m
we have
wave length=[tex] \frac{V}{f} [/tex]
59m=[tex] \frac{15000}{x} [/tex]
x=[tex] \frac{15000}{59} [/tex]=254.Hz
B.254 hz
6. Why do telescopes have to have a good motorized drive system to move them quickly and smoothly? a. because the Earth is rotating, with the telescope attached to it b. because astronomers typically have to look at many objects in the sky in a few minutes c. because all objects in the sky vary in brightness very quickly d. because the telescope can then be moved out from under the clouds to where it is clear e. You can’t fool me, telescopes never move; they stay in one position all night
Answer: The correct option is A ( because the Earth is rotating, with the telescope attached to it).
Explanation:
A telescope is a device that is used mostly for viewing distant objects. It's an optical instruments as it's made up of lens and curved mirror depending on the type of telescope. The first telescope was invented by Hans Lippershey in 1608. It is used extensively in war,sea and astronomical discoveries.
Parts of a typical telescope includes:
--> the optical system: this is the most important part of a telescope. This determines the optical aperture of the telescope, how bright or how sharp the formed image would be. This can be a lens or a mirror.
--> Eyepiece: this magnifies the image formed.
--> Motorized drive system: these drive system are mounted with the telescope to aid in a quick and smooth movement while detecting, for example, celestial bodies. This part of the telescope is important as the telescope is mounted on the earth surface which rotates about its axis from west to east. Since the drive system is motorized, it can automatically move very smoothly from east to west at exactly the same rate that Earth is rotating from west to east, so it can continue to point at the object being observed.
A seesaw is 4.0m long with a pivot at its midpoint. A boy who weighs 400N sits at a distance of 1.5m from the pivot. His sister weighs 300N. Calculate the distance at which the girl must sit if the beam is ti be balanced
Answer:
the girl must sit 2 cm from the pivot at the opposite end of the seesaw.
Explanation:
Given;
length of the seesaw, L = 4.0 m
weight of the boy, W₁ = 400 N
position of the boy from the pivot, d₁ = 1.5 m
weight of her sister, W₂ = 300 N
First, make a sketch of this information given;
0---0.5m---------------------Δ--------------------------4m
↓<--------1.5m-------> <---------x--------->↓
400 N 300N
Apply the principle of moment about the pivot, to determine the value of x;
Sum of anticlockwise moment = sum of clockwise moment
400(1.5) = 300(x)
600 = 300x
x = 600/300
x = 2 cm
Thus, the girl must sit 2 cm from the pivot at the opposite end of the seesaw.
Unpolarized light can undergo polarization by this means off a nonmetallic surfaces.
Answer:
तिकडी एकच
Explanation:
आप सल क्ल वल दन रव दंचंबी एक गम ok plz
Please, I need to finish my homework.
An object is to the left of a convex mirror. Describe the two rays needed to indicate the location and height of the image. Additionally, state what side of the mirror the image is on and whether it is real or virtual.
Answer:
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