Answer:
Stellar Spectra Classification The patterns of lines detected in stellar spectra are used by astronomers to classify stars into spectral classes. These spectral classes are a measure of a star's surface temperature since the temperature of a star dictates which absorption lines are present in its spectrum.
Explanation:
NEED HELP!!! IF YOU ANSWER ALL QUESTIONS I WILL GIVE YOU BRAINEST!!!!! 15 POINTS!!!!
1. Marina comes from a family with a lot of heart disease. She knows that she will have to go out of her way to make sure that her heart stays strong and healthy. What would be the BEST exercise to achieve this goal?
A.
yoga
B.
bowling
C.
swimming
D.
weightlifting
2. Alicia’s coach thinks that she should try some interval training so that she can get some anaerobic activity. Which of these would be BEST for Alicia to add to her routine?
A.
biking with occasional sprints
B.
meditation several times a day
C.
taking stairs instead of escalators
D.
running at a steady pace for miles
3. You should be very ambitious when setting personal goals for health.
A.
True
B.
False
4. Imagine that you are going to make an exercise routine. If your goal was to develop your health rather than one specific improvement, what should be in your plan?
A.
a focus on the benefits of stretching
B.
a variety of aerobic and anaerobic exercises
C.
a single exercise with increasing intensity
D.
an exercise that you have never tried before
PLEASE NO LINKS
Answer:
1) C.
swimming
2) A.
biking with occasional sprints
3) A.
True
4) B.
a variety of aerobic and anaerobic exercises
Explanation:
Can I please get help with this?
A force applied to an object at rest causes the object to move. According to Newton’s first law, what must be true of the force?
Answer:
An object will not move unless acted upon by an unbalanced force.
Explanation:
Since Newton's first law states that if a body is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in a straight line at constant speed unless it is acted upon by a force.
Hope this helps!!
According to Newton's law of motion an object will at a state unless and until a force act upon it. Hence, force is an external agent which change the state of an object.
What is Newton's law of motion?Newton proposed three laws of motion explaining the motion an object. The first law states that an object will continue at the state of motion or rest unless a force acting on it.
Therefore force is an external agent which acts on a body to change it from the state of rest or motion. Force is directly proportional to the mass of the body. Hence, greater the mass, greater force must be applied to change its state.
The first of motion is called law of inertia, where inertia is the tendency of a body to stay in a state. Therefore, force changes this tendency of an object.
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Làm như thế nào v cái bài có hình đính kèm
Answer:
I don't understand that language. This brainly is english.
Explanation:
How many laws of motion are there? (Newton's) 3 4 2 1
Answer:
There is three laws of motion by newton
Explanation:
Why do we use silk threads to suspend charged rods instead of metallic threads?
Answer:When you rub the glass rod with the silk, the rod charges positive. If you place a charged rod on one of the swivel stands, and then bring another charged
Explanation: i no it
Sonar is a device that uses reflected sound waves to measure underwater depths. If a sonar signal has a frequency of 288 Hz and the speed of sound in water is 1450 m/s, what is the wavelength of the sonar signal?
A pressure of 0.01 N/cm squared is produced when a book with an area of 300cm squared is place on a table what is the weight of the book
Answer:
Pressure =Area × height
0.01N/cm=300cm×height
height=0.01×300
3cm
The weight of the book is equal to 3N.
What is Pressure?Pressure can be described as the ratio of the force exerted to the surface area over which the force is exerted. We can define pressure as the force applied perpendicular to the surface per unit area over which that applied force is distributed.
The SI unit of pressure can be represented as the pascal (Pa). A pascal is the force of one newton (N) exerted over a surface area of 1 m². Since the pressure is dependent on the area so the pressure can be increased and decreased without changing the force.
Given, the pressure on the book, P = 0.01 N/cm²
The area of the book, A = 300 cm²
Pressure = Force/ Area
Force = Pressure ×Area
Force = 0.01 × 300 = 3 N
Weight of the book, W = mg = 3 N
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Can someone help me with these 3 questions!!!
Answer:
Below
Explanation:
To find the height of a ball thrown upwards we can use this formula :
vf^2 = vi^2 + 2ad
0^2 = 22^2 + 2(-9.8)d
484 = 19.6d
24.69 = d
25 m = d
To find the time of the phone dropped we can use this formula :
t = √2d/g
t = √2(15) / 9.8
t = √30/9.8
t =√3.142857
t = 1.749
t = 1.7 seconds
For a) since this object is free falling we know that it will accelerate towards earth at a rate of 9.8 m/s^2. The slope of a velocity time graph gives us the acceleration of the object. So in this case the slope would be 9.8 m.s^2
Hope this helps!
Disolveram-se 6,0g de NaOH em 114,0g de agua , exprime a composicao da solucao em percentagem em Massa de soluto por Massa de solucao
Answer:
i donot know
Explanation:
i done it for the first time
Ce unitate de masura are indicele de REFRACTIE?
Answer:se obesrva ca indicele de refractie NU are unitate de masura, este adimensional. Se exprima print-un raport, de exemplu 4/3, 1,5 etc.
Explanation:
Is it possible to burn a paper using lens? How?
Answer:
NO Y
Explanation:
MMMMMMMMM
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notes of diffusion
An aircraft traveling at 600km/h accelerates steadily at 10km/h per second. Taking the speed of sounds as 1100km/h at the aircraft's altitude, how long will it take to reach the sound barrier.
Answer:
V2 - V1 = a t for uniformly accelerated motion
t = (V2 - V1) / a = (1100 -600) km/hr / 10 km/hr/sec
t = 500 / 10 sec = 50 sec
what is physical change
Answer:a usually reversible change in the physical properties of a substance, as size or shape:
Freezing a liquid is a physical change.
Explanation:
Kevin and Kisha are ice skating. Kisha has a mass of 60 kg, and Kevin has a mass of 45 kg. As they face each
other, Kevin pushes off Kisha with a force of 54 N. Assume the friction between the skaters and the ice is
negligible.
t
Determine the magnitude of Kevin's acceleration.
Write your answer to two significant figures.
m/s
m
If Kevin with mass 45kg pushes Kisha with a force of 54N, the magnitude of Kevin's acceleration is 1.2 m/s²
Kisha's mass = 60 kg
Kevin's mass = 45 kg
Kevin pushes off Kisha with a force of 54 N
Since it was Kevin that pushed Kisha, and the required force is 54N, we can look for Kevin's acceleration using the equation below
F = ma
The considered mass is Kevin's mass
54 = 45a
a = 54/45
a = 1.2 m/s²
The magnitude of Kevin's acceleration is 1.2 m/s²
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Two cables are pulling on a box, sliding it across the (frictionless) floor. One cable
pulls to the east with a force of 3N, the other pulls to the north with a force of 4N.
If the box has a mass of 0.5kg, what is the net force and acceleration acting on this
box?
1) Net force is 7N, acceleration is 14 m/s/s
2) Net force is 7N, accelerations is 3.5 m/s/s
3) Net force is 5N, acceleration is 10 m/s/s
4)Net force is 5N, acceleration is 2.5 m/s/s
Answer:
Net force is 7N, accelerations is 3.5 m/s/s
Explanation:
PLEASE HELP
If the change in energy of an object is 50J, the work done on the object is
Answer:
Explanation: Since work done is= to energy lost,the work done on this object will also be 50J...
based on the illustrations, what happens to current in the presence of resistance in the connecting wire?
it prevents the current from passing through properly causing a surplus of voltage
Chauncy is driving down the hill that descends at an angle a 4.5° below horizontal. After driving 4.60 kilometers along the road, how much elevation has chauncy lost?
Answer:
360 m
Explanation:
Explanation is given in the attached image below.
Please Help with Acceleration graphs
When two atoms bond chemically it is because of the interaction between
A) the nuclei of each atom.
B) the protons in each atoms.
C) all electrons in the atoms.
D) the valence electrons in each atom.
Pls hurryyyy!!!
Answer:
Explanation:D
When two atoms bond chemically it is because of the interaction between the valence electrons in each atom because only the valence electrons of an atom are responsible for the chemical activity.
Therefore the correct answer is option D.
What is a chemical reaction?A chemical reaction is a process in which one or more substances, also known as reactants are converted to one or more different substances, known as products.
Because only an atom's valence electrons are responsible for the chemical activity and because the quantity of valence electrons indicates an atom's valency,
Valency is a highly important requirement for the chemical reactivity of any element, two atoms connect chemically as a result of their contact.
Thus, the correct answer is option D.
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what is the mass on mercury of an object that weighs 784 n on the earth’s surface?
Answer:
80 kg weighs 80 kg x 9.8 m/s2 = 784 kg m/s2, or 784 Newtons. The surface gravity of Mercury is 0.39 that of Earth's (table 10-1), so 80 kg weighs 784 N x 0.39 = 306 N.
Explanation:
I hope that helps you
what if water didnt have a negative charge?
im confused on number one
Explanation:
v=?, u=0, a=?, S=22m.
Using the formula, S=ut+½at²
22={0×5}+(½.a.5²)
22=½.a.5²
a=44/25 = 1.76m/s².
Therefore, net force = work done = ma = 48×1.76 = 84.48N.
therefore, power = work done/time = 84.48/5 = 16.896W.
hope this helps you.
why are hydraulic brakes less effective if there is air in the liquid
Answer:
air is compress able
since air can be compressed, then the hydraulics will not work as well. It won't be able to push the object or brake the wheels. Since water cannot be compressed, it is able to push something, that's how hydraulics work.
Explanation:
it reduces pressure and essentially makes the process less effective.
Sarah decelerates from 30 to 10m/s over a distance of 5m. What is her acceleration?
10. Analyze What is the wavelength of these waves?
Answer:
Wavelength is the distance between the two closest points that are in phase with each other along a wave.
Explanation:
The atomic mass of sodium is 0.0230 kg/mole. How many moles are in 1.59 kg of sodium?
[tex]\\ \sf\longmapsto No\;of\:moles=\dfrac{Given\:mass}{Atomic\:mass}[/tex]
[tex]\\ \sf\longmapsto No\:of\:moles=\dfrac{1.59}{0.0230}[/tex]
[tex]\\ \sf\longmapsto No\:of\:moles=69.13moles[/tex]
5) Find the length of guitar string that would vibrate at a fundamental frequency of 825 Hz if the string is stretched so that the velocity of waves on the string is 580 m/s?
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