What is the closed physical system?
A. Non of the answers are true
B. A system where matter and energy can leave but not enter the system
C.a system where matter and energy can leave but not enter the system
D. A system where matter and energy can not enter or leave the system
How do you think the mass of an object affects how much friction get exerted on the object by a rough surface?
Explanation:
Friction can't affect mass of a substance(considering for a substance whose mass doesn't change with time),rather it is the mass of an object which can affect friction variously. Let's take some example to understand the situation. So,higher the mass of the object,higher will be the frictional force.
Friction occurs because no surface is perfectly smooth. Rougher surfaces have more friction between them. Heavier objects also have more friction because they press together with greater force. Friction produces heat because it causes the molecules on rubbing surfaces to move faster and have more energy.
What’s the difference between atoms and molecules in a substance?
Answer:
Atoms are single neutral particles.
example: Ne, O
Molecules are neutral particles made of two or more atoms bonded together.
example:O2,HCl
Answer:
Atoms are single particles while molecules are particles made of two or more atoms bonded together.
Explanation:
What do all electromagnetic waves have in common?
They can travel at the speed of light.
O They have the same wavelengths.
O They travel only through matter.
O They have nonmoving magnetic fields.
Answer: A they can travel at the speed of light
Explanation: A on EDGE
Answer:
a
Explanation:
got 100
When exercising, which hormone level decreases in females often causing a better mood?
Estrogen
Adrenaline
Blood Sugar
Cortisol
Answer:
The correct option is;
Adrenalin
Explanation:
The presence of Adrenalin can cause headaches, memory loss, confusion, make a person unable to concentrate, and therefore, generally affects the mode in female, as such it is important for a decrease the level of Adrenalin by exercising, which causes the Adrenalin and cortisol to reduce in a similar way to consuming gasoline by burning gasoline, cardiovascular exercises burns Adrenaline.
Doing exercises causes adrenaline and cortisol, which are the body's stress hormones to be reduced.
Answer:
It's adrenaline
Explanation:
I just took a quiz and got it right
The Flash can travel 400 m in just 5.2 minutes. What is his average velocity in m/s?
Answer:
76.9231
Explanation:
Divide 400m by 5.2 to get the answer.
Speed = (distance) / (time to cover the distance)
Speed = (400 m) / (5.2 minutes)
Speed = (400 m) / (312 seconds)
Speed = 1.28 m/s
There's not enough given information to find his velocity.
(I'll be honest with ya, Flash: 1.28 m/s is no big deal. It's only about 2.87 miles per hour. My dog can walk faster than that, and so can most healthy people. If that's the best you can do, then you probably shouldn't be running around chasing bad guys.)
A car accelerates from a rest at -3 m/s2. What is the displacement after 4.7 sec?
Raymond and Julie ar driving to Santa Barbara.
They drive at an average speed of Bomon for
2.5 hours before he stopping for lunch. H
takes them 30 minutes to eat. After lunch
they continue driving or an average speed
of so mon for 3.0 nono . What is their
average speed, in miles
for the
3.5
entive
HID
per hour
The net external force on the propeller of a 3.32 kg model airplane is 23 N forward. What is the acceleration of the airplane?
Answer:
6.93 m/s^2
Explanation:
Given that the The net external force on the propeller of a 3.32 kg model airplane is 23 N forward
Where
Mass M = 3.32kg
Force F = 23 N
Force = mass × acceleration
Substitute all the parameters into the formula
23 = 3.32 × a
a = 23/3.32
a = 6.93 m/s^2
Therefore, the acceleration of the airplane is 6.93 m/s^2
Which structure is represented by letter B?
Choose 1 answer:
(Choice A) A Cytosol
(Choice B) B Cell membrane
(Choice C) C Ribosome
(Choice D) D Cell wall
Answer: A Cytosol
Explanation: Jelly - like fluid that fills the space between cell organelles. Hoped This Helped :) Have a blessed day.
The cytoskeleton, which gives a cell its structure, allows organelles to move inside the cell, and provides a method by which the cell itself can move, is an ordered framework of fibrous molecules found in the cytoplasm. Thus, option A is correct.
What is the main function of cytosol in the cell?The fluid that fills cells is called cytosol. In this water-based solution, organelles, proteins, and other cell components float. Any cell's cytosol is a sophisticated solution whose characteristics allow for the performance of life's essential processes.
The cytoplasm houses all the organelles found in eukaryotic cells, including the nucleus, endoplasmic reticulum, and mitochondria.The portion of the cytoplasm that is not contained in an organelle is known as the cytosol.
Therefore, Although the cytoplasm may not seem to have any shape or organization, it is actually quite well-organized.
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Fish oil in your diet will improve your memory. Independent variable? Dependent variable
Which form of emission is commonly not written in nuclear equations because they do not affect charges, atomic numbers, or mass numbers?
Answer:
Gamma radiation .
Explanation:
Three types of emission result at the time of nuclear emission .
alpha emission
Beta emission
Gamma radiation emission
Gamma radiation results in the emission of gamma ray . This is a very high frequency radiation . It is not a particle having charge and mass like alpha and beta emission . So it has no effect on the mass and charge of the product that is formed after gamma radiation . The only effect it has on the product is that it reduces the kinetic energy of the emitting particles or it reduces the internal energy of the product . It causes negligible change in the mass of the product and no change in the charge of the product.
That is why , generally this product is not written in the nuclear reaction .
Answer:
The answer is Gamma ray
Explanation:
Because this is a very high frequency radiation, is not a particle having charge and mass like alpha and beta emission, so it has no effect on the mass and charge of the product that is formed after gamma radiation. The only effect it has on the product is that it reduces the kinetic energy of the emitting particles or it reduces the internal energy of the product, it causes negligible change in the mass of the product and no change in the charge of the product.
Same amount of force is acting on car and bus.If the ratio of the bus and car 25:1 calculate the ratio of the acceleration produced in the car to the acceleration produced in the bus
Answer:
1:25
Explanation:
The force acting on an object is given by :
F = ma ...(1)
m is mass and a is acceleration
It is given that the ratio of force acting on the bus and car 25:1 i.e. [tex]\dfrac{F_1}{F_2}=\dfrac{25}{1}[/tex], 1 is for bus and 2 is for car.
We need to find the ratio of the acceleration produced in the car to the acceleration produced in the bus. From equation (1),
[tex]\dfrac{F_1}{F_2}=\dfrac{a_1}{a_2}[/tex]
[tex]\dfrac{a_2}{a_1}=?[/tex]
[tex]\dfrac{F_1}{F_2}=\dfrac{1}{25}[/tex]
So, the ratio is 1:25.
An ant crawled from a hole to the food. For the first 6
minutes, it travelled at an average speed of 15 m/min. For
the next 9 minutes, it travelled at an average speed of 10
m/min. What was the average speed of the whole journey?
m/min
Answer:12
Explanation:Average speed=Total Distance divided by Total Time.
what are different type of plastids explain them?
Answer:
types of plastids
chloroplasts
chromoplasts
gerontoplasts
leucoplasts
Explanation:
ans
When deciding antenna types, why might the use of an omnidirectional antenna be inadvisable?
Answer:
Omnidirectional antennas are inadvisable to be used because when oriented vertically they radiate radio power equally in all horizontal directions, but heir radio power varies with the angle to the axis, reducing to zero at the axis.
Explanation:
Omnidirectional antennas radiates equal radio power in all directions perpendicular to an axis, with power varying with the elevation angle. This means that their power declines to zero on the axis. This is unlike the isotropic antennas that radiates equal power in all directions, without any reduction in radio power with angle to the axis. Omnidirectional antennas are mostly used for radio broadcasting antennas in mobile devices that use radio such as cell phones, FM radios, walkie-talkies, wireless computer networks etc.
A mass is measured as 6.2 kg in one experiment and as 6.20 kg in another. in what way do these measurements differ
Answer:
They are both same
Explanation:
6.20=6.2kg
what is base rule of rounding off
10.What is the Kinetic Energy of a 150 kg object that is moving with a speed
of 15 m/s? (7b)
Choose the nonmetallic elements from the list. Check all that apply. yttrium oxygen boron polonium argon gallium carbon
Answer:
oxygen
argon
carbon
Explanation:
Answer:
B E G Oxygen Argon Carbon
Explanation:
what is the difference between an ideal machine and a practical machine
Answer:
Ideal machines are said to have parts which are weightless , frictionless and strings if any are inextensible. Practical machines have parts which have weights, friction and it causes some loss of work done.
Explanation:
Answer: Ideal machines are said to have parts which are weightless , frictionless and strings if any are inextensible. Practical machines have parts which have weights, friction and it causes some loss of work done.
Explanation:
What is the average speed of a car that traveled 222.0 miles in 4.596 hours?
Answer:
48.3mph
Explanation:
Given that
Distance = 222.0miles
Time = 4.596hours
Average speed = total distance/total time
= 222.0miles/4.596
= 48.3mph
Hence the average speed is 48.3mph
Driving at 75 m/s, you hit the brakes on your new car, accelerating at
a rate of -20 m/s2. How much time will it take the car to come to
rest?
Explanation:
initial velocity, u = 75m/s
acceleration, a = -20m/s2
final velocity, v = 0m/s (rest)
Using the formula,
v = u + at
0 = 75 + (-20)t
t = 3.75 seconds
Name three common areas where unethical situations can occur in research.
Answer:
Unethical behavior or ethical code are very important ion research or different areas. Ethical code protects people from misbehavior, disclose their privacy etc.
Explanation:
Many of people walk to the working place where most of people witnessed the unethical behavior with them. There are many area that are responsible for misconduct such as :
Misusing company timeAbusive behavior by researcher in field work.Leak privacy by a doctor of patient. In organization lying to the employee related to contract.To violet the company policies. In clinical setting misbehave with patient that unethical Unethical behavior could occur in business, among individual, by professional and among the political parties and social workers.Which of the following is NOT a piece of evidence for the Big Bang Theory?
Ratio of Hydrogen and Helium to other elements
Expanding Universe
Black Holes
Cosmic Microwave Background Radiation
um the answer is A
np :3 i hope this is right
If Johnny won a 300 meter race in 40 seconds, his speed would be ?
Formula: s = d/t
s = speed
d = distance
t = time
Solve using the values we are given.
s = 300/40
s = 7.5m/s
Best of Luck!
Answer:
7.5 m/s
Explanation:
Tell me about your experiences with science
Answer:
Well i once did an expiremnet and it exploaded in my face lol
Explanation:
Answer:
so good
Explanation:
perfect nice and explody too muchA motorcycle travels at 6.0 m/s. After 3.0 seconds, the motorcycle travels at 15.0 m/s.
Which of the following was the average acceleration of the motorcycle?
The average acceleration of the motorcycle is determined as 3 m/s².
Acceleration of the motorcycle
The acceleration of the motorcycle is calculated as follows;
a = (v - u)/t
where;
v is the final velocityu is the initial velocityt is time of motiona = (15 - 6)/3
a = 3 m/s²
Thus, the average acceleration of the motorcycle is determined as 3 m/s².
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A long, nonconducting, solid cylinder of radius 4.0 cm has a nonuniform volume charge density r that is a function of radial distance r from the cylinder axis: r ! Ar2 . For A ! 2.5 mC/m5 , what is the magnitude of the electric field at (a) r ! 3.0 cm and (b) r ! 5.0 cm?
Answer:
a) 1.91 c/m
b) 3.62 c/m
Explanation:
See attached image
I will give brainliest if right
Which cell structure is thought to have arisen through an endosymbiosis in plant but not animal cells?
Choose 1 answer:
(Choice A) A Cell wall
(Choice B) B Mitochondria
(Choice C) C Chloroplast
(Choice D) D Ribosome
Answer:
chloroplast
Explanation:
Endosymbiosis theory explains the origin of chloroplast and mitochondria in the eukaryotic organisms.
When the pro-eukaryotes engulfed the blue-green algae or photosynthetic bacteria, these bacteria formed the symbiotic relationship with the pro-eukaryotes. These photosynthetic bacteria transformed into the chloroplast organelles of the eukaryotes which can capture the sunlight and use it in the synthesis of glucose molecules. These eukaryotic cells later formed the plant kingdom.