Answer:
A. And D.
A. They vary in how tightly their arms are wound.
D. Some have a band of stars and materials through their middle, but others do not.
The appearance of spiral galaxies vary in the following ways:
A. They vary in how tightly their arms are wound.
D. Some have a band of stars and materials through their middle, but others do not
Spiral galaxies are the galaxies where the gas clouds and the stars are concentrated in spiral arms.
Examples of spiral galaxies include Milky way, Sunflower Galaxy, Andromeda Galaxy, etc.
It should be noted that spiral galaxies vary in how tightly their arms are wound while some have a band of stars and materials through their middle, but others do not.
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Which of the following types of stars is hottest?
A
B
C
D
Answer:
graph b
Explanation:
What force prevents a machine from having 100% efficiency? A. Magnetic B. Electric O C. Friction O D. Gravity
Answer:
I believe it would be C ? my apologies if I'm wrong.
Suppose you take a trip that covers 490 km and takes 1 hours to make. Your average speed is
O 35 km/h
O 490 km/h
O 70 km/h
O 980 km/h
Answer:
B
Explanation:
490km/h
490km/1h
490000/3600
note: 1h= (60×60)=3600
hope it help??
By the time children are five years old:
A. the typical 90-minute sleep cycles of alternating REM and NREM are established.
B. about 50 percent of sleep time is spent in REM sleep and 50 percent is spent in quiet sleep that is very similar to NREM stages 1 and 2.
C. their sleep pattern is characterized by 60-minute sleep cycles, producing up to 13 cycles per day.
D. they will begin to experience their first dreams and nightmares.
Option D is correct. Around the age of five, children begin to experience their first dreams and nightmares
By the time children are five years old, several developments occur in their sleep patterns.
Option A is incorrect because the typical 90-minute sleep cycles of alternating REM (Rapid Eye Movement) and NREM (Non-Rapid Eye Movement) are not yet established at this age.
Option B is also incorrect as the sleep time distribution between REM sleep and quiet sleep (similar to NREM stages 1 and 2) is not necessarily equal at this stage.
Option C is inaccurate because 60-minute sleep cycles producing up to 13 cycles per day do not align with the typical sleep patterns of five-year-olds.
However, option D is correct. Around the age of five, children begin to experience their first dreams and nightmares.
This is an important milestone in their cognitive and emotional development, as it reflects the maturation of the brain regions involved in dreaming and the processing of emotions during sleep.
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a stone is dropped down an empty mine shaft. it takes 3 seconds to reach the bottom. assuming that the stone falls from rest and accelerates at 10m/s^2, calculate.
a) the maximum speed reached by the stone before hitting the bottom.
b) the average speed of the stone in flight.
c) the depth of the mine shaft.
Answer:
I think A. I had a similar question
Explanation:
Describe the procedure of using pani ghatt
Answer:
The water from head of 20m or above is brought in open or closed conduit. Traditionally wooden blades are used as turbine on which water jets are strike upon, jets rotates the bigger wheel mounted on smaller wheel. There is continuos feed of grains in between grinds into finer particles.
When an object moves in a straight line, which statement is true?
A. the object moves at a constant speed, the resultant force is zero
B. the object accelerates , the resultant force is zero
C. the object moves at a constant speed, the forward force is greater than the resistive force
D. The object requires a resultant force in order to move at a constant speed
Answer:
In think the answer is a I’m not sure
Explanation:
Becuase constant speed is always zero there is no acceleration
Why are there fewer elements than there are compounds?
Compounds are 2 or more elements that are combined together to form a new substance. Why are there are more compounds than elements? Because elements can combine with more than just one element, thus creating a whole series of combination possibilities.
If the strength of the sun's magnetic field decreased from its current level, why would the temperature of sunspots increase?
Magnetic field lines emerge from one sunspot and re-enter at the other spot. Also, there are more sunspots during periods of increased magnetic activity. At ...
The temperature of sunspots increases because magnetic field lines emerge from one sunspot and reappear in another. During periods of increased magnetic activity, there are also more sunspots.
What is the sun's magnetic field?The magnetic field of the sun has two poles, similar to a bar magnet. Every 11 years, at the peak of the solar activity cycle, the poles flip.
The magnetic field is carried away from the sun's surface and through the solar system by a solar wind made up of charged particles. The sun is more like a fluid than a solid ball.
Thus, the magnetic field lines emerge from one sunspot and reappear in another. During periods of increased magnetic activity, there are also more sunspots.
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Which of the following is a product in the process of photosynthesis?
O Nitrogen
O Water
O Glucose
O Sunlight
Answer:
glucose is the product in the process of photosynthesisA sphere of radius r =34.5 cm and mass m = 1.80 kg starts from rest and rolls without slipping down a 30.0∘ incline that is 10.0 m long.
A.) calculate its translational speed when it reaches the bottom.
B.) Calculate its rotational speed when it reaches the bottom.
C.) what is the ratio of translational to rotational kinetic energy at the bottom?
Answer:
Explanation:
It depends on the construction of the sphere.
Let's ASSUME it is uniform construction with a moment of inertia (2/5)mR²
The Change in potential energy will equal the change in kinetic energy
mgh = ½mv² + ½Iω²
mgh = ½mv² + ½((2/5)mR²)(v/R)²
2gh = v² + 2/5v²
2gh = 7/5v²
v = √((10/7)gh)
v = √((10/7)(9.81)(10.0sin30.0))
A) v = 8.37 m/s
B) ω = 8.37/0.345 = 24.3 radians/s
C) ½mv² / ½Iω² = mv²/Iω² = mv²/((2/5)mR²)(v/R)² = 5/2
If a person weighs 160 Newtons on Earth, what is their weight in pounds on Earth?
A. 27
B. 36
C. 712
D. 534
Answer:
B. 36 lb
Explanation:
m = 160/9.8 = 16.3 kg
16.3 kg ( 2.205 lb/kg) = 36 lb
Why might a scientist use a physical model of a plant cell instead of studying
a cell directly?
A. A model can be used for things that are too hot to handle easily.
B. A model can be used for things that are too small to see clearly.
C. A model can be used for things that are too large to study directly.
D. A model can be used for things that are too simple to study
directly
B. A model can be used for things that are too small to see clearly
A 8 kg brick is sitting on a frictionless table. If a 60 N horizontal force is applied to the brick and it accelerates at 2 m/s2, what will be the force of friction
a.24
b.44
c.0
d.600
Five example of effect of gravitation in our daily life
Five example of effect of gravity in our daily life
Five example of free fall in our daily life
Answer:
The apple
falling to our death
the earth pulling us down
what a rock falls onto our head and we die
when a child falls into a volcano and lives for 2 seconds and then dies
Explanation:
Ralph is mowing the back yard with a push mower downward with a force of 20.0 N at an
angle of 30.0° to the horizontal. What are the horizontal and vertical components of the force
exerted by Ralph?
Answer:
Horizontal component = (10N) · sin (20°) = 3.42... N (rounded)
Vertical component = (10N) · cos (20°) = 9.39... N (rounded)
Explanation:
what characteristic feature do all anxiety disorders share?
Answer:
Something they all share is excessive worry that disturbs their normalized living style.
An astronaut drops a hammer from 3.0 meters above the surface of the Moon. If the acceleration due to gravity on the Moon is 1.62 meters per second2, how long will it take for the hammer to fall to the Moon’s surface?
Distance = (1/2 acceleration) · (time)²
3 m = (0.81 m/s²) · (t²)
t² = (3m / 0.81 m/s²)
t² = 3.70 s²
t = 1.92 seconds
Answer:
it c on edge
Explanation:
trust
How many significant figures are in the following measurements? a. 3000000000 m/sA bike rider accelerates uniformaly at 2.0m/s^2 in 7.0 s. What was the speed of the object after 2.0 seconds?
Answer: 1 sig fig
Explanation: because 0s aren‘t significant and yes decimal points matter but after the decimal it’s a 0. So it is 1. If it was 0.30 it would be 2 sig figs but 0.03 would be one sig fig.
!!! , ? ? ? (no silly answers please).
Answer:
hellooo
Explanation:
i think ummm
. . .
Help.. mee..
;-;
Dont answer if you dont know I dont want to fail this
Answer:
It would be B because the warm air heats up and then burns the marshmallow. And the heat and the marshmallow were touching each other
Explanation:
Answer:
its B because both objects are touching, every other option the heat moves through the air
how do sound waves behave as a solid
a. they travel faster in a solid than other mediums
b. they travel slower in a solid than other solids
c. they stop when they hit a solid
d.sound waves behave the same in any medium
Answer:
A. They travel faster in a solid than other mediums
Explanation:
Sound waves travel faster in solids because the density of solids is higher than that of liquids which means that the particles are closer together and sound can be transmitted more easily.
bro someone please help me, i need to turn this in by tomorrow first class of the day. if you can answer this page for me, please answer with a short sentence or paragraph if needed. thank you and please help me.
Answer: Sorry you I don't umderstand
Explanation:
A helicopter propeller applies an upward force of 2800 N. The force of gravity on the helicopter is 2000 N. Another person of weight 950 N grabs the helicopter and holds on
1.) can the helicopter take off with the person holding on?
2.) Why or why not? (answer in terms of forces and directions)
3.) how much force would the propeller need to produce to perfectly balance the forces on the helicopter?
Answer:
Explanation:
1) No take-off possible
2) The downward force is greater than the upward force.
3) 2000 + 950 = 2950 N upward
If the ambient temp. is 75 F, what is it Centigrade?
Explanation:
We know
C/5 = F -32/9C/5 = 75 -32/9C/5 = 43/9C ≈ 25°CDuring which section was the person moving at the highest speed? What was their speed? Defend your answer.
Where's the person that the question is talking about?
Answer:
d was
Explanation:
Tarea del 21 de octubre 2021 del 5 de primaria
Answer:xss
zzz
Explanation:
zzz
True or false: Electronic machines with no moving experience friction and get hot because electricity is moving through wires
Answer:
true..............yh
1. A 6-volt battery produces a current of 0.5 amps. What is the power in the circuit?
Answer:
hope this will help you
have a great day
Explanation:
please mark me as the brainliest
Why is mass not included in the calculated height equation ?
Answer:
You can't use energy conservation when mass is removed. This has required energy that you are not taking into account.
Answer:
because some time it dose not need to be i equation becasue it is not need
Explanation:
