Answer:
Food provides energy for physical activity
Explanation:
As you get more active and more fit, and/or as you lose weight, your energy needs (how many calories you need) may change. To get the energy you require, you need to get the proper amount of: Protein, which is needed to maintain and rebuild tissues such as muscles.
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which of the following is a selectively permeable membrane?
a) nulcer membrane
b) plasma membrane
c) cell wall
d)none of these
Answer:
B
Explanation:
The plasma membrane is a selectively premeable membrane that chooses what goes in and out of the cell. The cell wall is for support and the nuclear membrane decides what goes in and out of the nucleus
Answer:
Plasma membrane
Explanation:
The plasma membrane consists of a lipid bilayer that is semipermeable.The plasma membrane regulates the transport of materials entering and exiting the cell.So, it is selectively permeable membrane.
HOW WOULD SOUND REFLECT
Answer:
Reflection. If a sound is not absorbed or transmitted when it strikes a surface, it will be reflected. ... Reflection of a sound wave at a barrier, as if from an imaginary source at an equal distance behind the barrier. Sound reflection gives rise to DIFFUSION, REVERBERATION and ECHO.
Answer:
by a echo
Explanation:
if u are I a sound proof room you shout to the wall the echo will then reflect
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?
Áp dụng công thức tính độ dài ạ
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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Which of the following forces exists between objects even in the absence of direct physical contact
A. Contact force
B. Field force
C. Fundamental
Answer:
B. Field Force
Explanation:
Answer:
The Answer is (B) Your welcome!
what is the relationship between electric field lines and equipotential surfaces?
what is the prefix of 10^10
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what supports a white dwarf against the crush of gravity?
Answer: In particular, electron degeneracy pressure is what supports white dwarfs against gravitational collapse, and the Chandrasekhar limit (the maximum mass a white dwarf can attain) arises naturally due to the physics of electron degeneracy.
Explanation:
Degeneracy pressure keeps a white dwarf from collapsing under its own gravity.
What is Degeneracy pressure?Electron degeneracy pressure is a particular manifestation of the more general phenomenon of quantum degeneracy pressure.
The maximum mass that a white dwarf can support against collapse is 1.4 solar masses due to the Chandrasekhar limit.
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How many laws of motion are there? (Newton's) 3 4 2 1
Answer:
There is three laws of motion by newton
Explanation:
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?
at a certain distance from a point charge the electric potential is 200V and electric field is 200V/m, what is this distance
a. 10m
b. 8m
c. 0.1m
d. 0.8m
Explanation:
0.1 m
i dont know how to explain but i know the ans so ............byee ...
A boy exerts an unknown horizontal force as he pulls a 52 N sled across packed snow. The coefficient of friction is 0.12. If a person weighing 650 N sits on the sled, what force is needed to pull the sled across the snow at constant speed?
Answer:
0.62
Explanation:
Ff = mg = 52 N
Since the speed is constant, the friction
force equals the force exerted by the
girl, 36 N.
Ff = ukFn
so uK = Ff/Fn
= 36 N/52 N
= 0.69
Force is needed to pull the sled across the snow at constant speed is 0.62 N
What is force?A force in physics is an effect that has the power to alter an object's motion. An object with mass can change its velocity, or accelerate, as a result of a force. An obvious way to describe force is as a push or a pull. A force is a vector quantity since it has both magnitude and direction.
Given in the question a boy exerts an unknown horizontal force as he pulls a 52 N sled across packed snow. The coefficient of friction is 0.12. If a person weighing 650 N sits on the sled,
Ff = mg = 52 N
Since the speed is constant, the friction force equals the force exerted by the boy, 36 N.
Ff = (uk).(Fn)
so uK = Ff/Fn
= 36 N/52 N
= 0.69 N
Force is needed to pull the sled across the snow at constant speed is 0.62 N
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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.
A motorboat accelerates uniformly from a velocity of 10.5 m/s to the west to a velocity of 6.5 m/s to the west. If its acceleration was 4.5 m/s2 to the east, how far did it travel during the acceleration
Answer:
7.4m ............................
Công thức tính quãng đường đi được của chuyển động thẳng biến đổi đều là:
At time t = 0 the velocity is v1. Therefore C1 = v1 and C2 = x1. Equations (1), (2), (3), and (4) fully describe the motion of particles, or bodies experiencing rectilinear (straight-line) motion, where acceleration a is constant.
hi can someone please answer the number 2 question i really need it thank you ❤️
#Batangas
[tex]\\ \tt\longmapsto d=\dfrac{49.07}{8}\times 100[/tex]
[tex]\\ \tt\longmapsto d=6.13(100)[/tex]
[tex]\\ \tt\longmapsto d=613km[/tex]
#Puerto Princesa
[tex]\\ \tt\longmapsto d=\dfrac{58.10}{8}\times 100[/tex]
[tex]\\ \tt\longmapsto d=7.26(100)[/tex]
[tex]\\ \tt\longmapsto d=726km[/tex]
#Davao
[tex]\\ \tt\longmapsto d=\dfrac{39.47}{8}\times 100[/tex]
[tex]\\ \tt\longmapsto d=4.93(100)=493km[/tex]
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
what is the smallest possible value for the index of refraction?
Answer:
1.0
Explanation:
The smallest possible value for the index of refraction is 1.0.
What is Index of refraction?This talks about how fast light travels through an object by taking note of how much the light is bent, or refracted, as it enters into the material.
The smallest possible value for the index of refraction is 1.0 because the speed of light in any medium is always less than than the speed of light in air or vacuum.
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ultraviolet light destroys which vitamin essential for cell division?
Answer:
Both Vitamin D and folate level are affected by UV radiation from sunlight.
Explanation:
A) half as much
B) as much
C) two times as much
D) three times as much
Answer:
3 times as much
Explanation:
half as much would be 12%, as much would be 24%, and two times as much would be 48%.
3 times as much is 72, which is about 74%
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:
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...
A car, travelling at a speed of 30 m/s in a straight line, brakes and decelerates at a uniform rate of 2 m/s2. How much further does it travel before coming to rest?
Answer:
You are finding acceleration, so it would be 15 m/s2
Explanation:
30 divided by 2
You throw an orange out a widow at a height of 12 meters upwards at an angle of 32 to the horizontal with an initial velocity of 3.5m/s.How long will the orange be in flight before it hits the ground? Round the answer to the nearest tenth.__ Seconds
Answer:
3 meters
Explanation:
add up dum boi
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.
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
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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Exercise will not help maintain the health of your endocrine system.
A.
True
B.
False
is the right answer c?
Answer:
Yea I believe so
Explanation:
Please Help with Acceleration graphs