The ability to allow the heart, blood, vessels, and lungs to supply oxygen to the body is called Cardiovascular fitness.
In the winter, people often buy large bags of rock salt to sprinkle on their walkways. Why do people do this?
Answer:
It helps melt the ice away on their walkway.
Explanation:
The salt makes the ice to freeze at a lower temperature. So when a solute (salt) comes into contact with the ice the freezing point is lowered.
help pleasee i give brainliest
Answer:
A is a solid. C is a gas. In solid an liquid the particals are touching. In C, the particals have less affect on each other because they are so far apart.
A girl pushes her little brother on his sled with a force of 300 N for 750 m. a. How much work is this? _______________ b. How much energy is used?__________ c. How much power does she use if it takes her 25s?_________ d. How much power does she use if she runs and complete the 750m in 10s?________
Answer:
w=225000 J
E=225000 J
P=9000 W
P=22500 W
Explanation:
Ew=Fd=E
P=E/t
(A) w=225000 J
(B) E=225000 J
(C) P=9000 W
(D) P=22500 W
What is Force?
Aristotle famously described a force as anything that generates an object to undergo “unnatural motion. Sir Isaac Newton was one of the preferred scientists to explore gravity and force. Any kind of force is simply a push or a pull. It can be described as a push or pull on an object.
Thus, Ew=Fd=E (P=E/t)
Force can assemble a body that is at rest to move.
It can contain a moving body or slow it down.
It can accelerate the acceleration of a moving body.
It can also modify the direction of a moving body along with its build and size.
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TIME REMAINING
52:45
The robotic rover Curiosity has instruments that detect radiation both inside the spacecraft and in the Mars environment. What is most likely the purpose of this radiation detection?
to determine whether human exploration of Mars is possible
to develop better X-ray technology
to find evidence of once-living Martian microorganisms
to investigate evidence of hydrogen and water
Answer:
D
Explanation: just trust me
What is the wave speed of a 1,000 Hz wave with a wavelength of 0.04 m?
Wave speed = 40 m/s
Explanation:
Wave speed = frequency x wavelength
Wave speed = 1000 * 0.04
Wave speed = 40 m/s
If a giraffe runs for 30 minutes at a speed of 40 miles per hour, how far will the giraffe run? Please help me
Answer:
20 mi
Explanation:
distance= rate* time
30 min*(1 hour)/ 60 min
.5 hours
(40 mi/hr)(.5 hr)
20 mi
What is electronegativity? (2 points)
An atoms ability to attract other electrons and form a chemical bond
A type of electricity only found in some atoms
The total number of electrons in an atom
A property of electrons that give them a negative charge
Answer:
the first one
Explanation:
an atoms ability to attract other electrons and form a chemical bond
since other one got deleted :(
Electronegativity is an atom's ability to attract other electrons and form a chemical bond.
What is electronegativity?The tendency of an atom of a given chemical element to attract shared electrons (or electron density) when forming a chemical bond is known as electronegativity.
The electronegativity of an atom is affected by its atomic number as well as the distance between its valence electrons and the charged nucleus. The higher the associated electronegativity, the more an atom or substituent group attracts electrons.
Electronegativity is a simple way to quantify bond energy as well as the sign and magnitude of a bond's chemical polarity, which characterizes a bond along a continuous scale from covalent to ionic bonding.
Hence, electronegativity is an atom's ability to attract other electrons and form a chemical bond.
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Does frequency of sound change with the temperature?
Answer: Temperature is also a condition that affects the speed of sound. Molecules at higher temperatures have more energy, thus they can vibrate faster. Since the molecules vibrate faster, sound waves can travel more quickly. The speed of sound in room temperature air is 346 meters per second.
Explanation: so basically, yes!
I WILL MARK BRAINIEST
Answer:
i think answer b
Explanation:
what is the average velocity of a car that travels 30 kilometers due west in 0.50 hour
The average velocity of a car that travels 30 kilometers due west in 0.50 hour - 60 km/hour west.
Average velocity is the displacement of an object with the time change. To find the average speed of an object we divide the distance travelled by the time elapsed.
Velocity is a vector quantity and average velocity can be found by dividing displacement by time.Average velocity is defined as the change in position or displacement (∆x) divided by the time intervals (∆t) in which the displacement occursAverage velocity = ∆x/∆t
Then,
average velocity = 30/0.5
= 300/5
= 60
Thus, the correct answer would be - 60 km/hour west.
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a cricket ball is hit so that it travels straight up in the air and it require 3 second to reach the maximum height its initial velocity is
Answer:
v = u - gt
At maximum heitht, v = 0
0 = u - (9.8)(3)
u = 29.4 m/s initial velocity
A ball is dropped off the side of a bridge after 1.55 seconds how far has it fallen (units=m)
Answer:
d = 11.77 m
Explanation:
Given that,
A ball is droped off the side of a bridge after 1.55 seconds.
We need to find how far it has fallen.
It will fall under the action of gravity. It would mean that a = g = 9.8 m/s²
Let it is fallen at a distance d. d can be calculated using second equation of motion as follows :
[tex]d=ut+\dfrac{1}{2}at^2[/tex]
Put u = 0 and a = g
So,
[tex]d=\dfrac{1}{2}\times 9.8\times (1.55)^2\\\\d=11.77\ m[/tex]
Hence, it will fall at a distance of 11.77 m.
Answer:
-11.77!!!! DONNT FORGET NEGATIVE
Explanation:
15. What change of state occurs when butter turns into a liquid in a hot pan?
Answer:
Physical change from solid to liquid where it is a reversible reaction as melted butter can be frozen to its original form
Who discovered the strong nuclear force
Answer:
James Chadwick
Explanation:
James Chadwick discovered that the nucleus of each atom contains neutrons in 1932. Shortly after this, Eugene Wigner suggested that the electromagnetic force is not involved in holding the nucleus together and that there are two different nuclear forces. We now refer to these as the strong and weak nuclear forces.
Answer:
James Chadwick
Explanation:
i just searched it up lol
Determine the initial velocity of a marble that lands 1.8m away from a tabletop that is 0.8m from the ground.
Acceleration due to gravity = 9.85
0 2.25 m/s
2.6 m/s
0 1.8 m/s
4.5 m/s
Answer:
4.5 m/s
Explanation:
[tex]s_x[/tex] = Horizontal displacement = 1.8 m
[tex]s_y[/tex] = Vertical displacement = 0.8 m
[tex]u_x[/tex] = Horizontal velocity
g = Acceleration due to gravity = [tex]9.81\ \text{m/s}^2[/tex]
t = Time taken to fall down
[tex]s_y=u_yt+\dfrac{1}{2}gt^2\\\Rightarrow 0.8=0+\dfrac{1}{2}\times 9.8\times t^2\\\Rightarrow t=\sqrt{\dfrac{2\times 0.8}{9.8}}\\\Rightarrow t=0.4\ \text{s}[/tex]
[tex]s_x=u_xt+\dfrac{1}{2}a_xt^2\\\Rightarrow 1.8=u_x\times 0.4+0\\\Rightarrow u_x=\dfrac{1.8}{0.4}\\\Rightarrow u_x=4.5\ \text{m/s}[/tex]
The initial velocity of the marble is 4.5 m/s.
Lenny wrote the steps he used to find the mass of an object with 400 J of energy moving at a velocity of 8 m/s.
1. Find the square of 8 m/s, which is 64 m2/s2.
2. Divide kinetic energy, 400 J, by 64 m2/s2, which is 6.25 J per m2/s2.
3. Divide 6.25 J per m2/s2 by 2 to get a mass of 3.125 kg.
Which best describes Lenny’s error?
A. In Step 1, he should have found the square root of 400 J instead of squaring 8 m/s.
B. In Step 1, he should have multiplied 8 m/s by 2 instead of squaring it.
C. In Step 2, he should have divided 64 m2/s2 by 400 J instead of dividing 400 J by 64 D. m2/s2.
In Step 3, he should have multiplied 6.25 J per m2/s2 by 2 instead of dividing it by 2.
Answer:
In Step 3, he should have multiplied 6.25 J per m2/s2 by 2 instead of dividing it by 2.
Explanation:
D. In Step 3, he should have multiplied 6.25 J per m2/s2 by 2 instead of dividing it by 2.
What is Kinetic energy?The energy that it possesses due to its motion. It is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity.
According to the question,
The object posses an kinetic energy,
Given Mass of an object = 400 J
Energy moving at a velocity= 8 m/s.
[tex]E_k =\frac{1}{2} mv^2\\\\=400J = \frac{1}{2} *m(8)^2\\\\\\=\frac{400J}{64m^2/s^2} = \frac{1}{2}*m\\ \\ =6.25 *2 = m\\\\=12.25 kg[/tex]
Hence,
In the step 3 ,he should have multiplied 6.25 J per m²/s² by 2 instead of dividing it by 2.
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A. What did the neuron say to the muscle say? (Use your basic physiological knowledge, such as the function of
neurons and muscles, to answer the question)
Answer:
Somatic motor neurons originate in the central nervous system, project their axons to skeletal muscles (such as the muscles of the limbs, abdominal, and intercostal muscles), which are involved in locomotion.
Explanation:
Muscles move on commands from the brain. Single nerve cells in the spinal cord, called motor neurons, are the only way the brain connects to muscles. When a motor neuron inside the spinal cord fires, an impulse goes out from it to the muscles on a long, very thin extension of that single cell called an axon.
Which describes density?
A. amount of volume for a given object
B. ability of an object to take up space
C. amount of mass in a given volume
D. ability of an object to float in water
Answer:
the answer to your question is C, Amount of mass in a given volume
Explanation:
Answer:
c
Explanation:
HI CAN ANYONE PLS ANSWER DIS PLS!!!!!!
Answer:
Volume of an object (L): blue 105.00, yellow 105.00, green 102.50, red 101.25
Density of an object (kg/L) Mass / Volume: blue 1, yellow 1, green 1.014, red .992
Sink or Float: blue sink, yellow sink, green float, red float
hope this helps
Reese can run 10 meter in 5 seconds.What is her speed?
Answer:
2 meters per second
Explanation:
You are at the Super Bowl. The coach puts you in during the 4th quarter to be the quarterback to secure your team the win. Since you are fresh off the bench, you are able to throw the ball with more force than the last person. What advantages, using Newton's second law, will this have when playing?
Answer:
the ball will fly faster, and longer distance, which means there is going to be less air resistnace friction acting upon the ball.
Explanation:
Write a paragraph describing the series of events that occur in the operation of a complex machine that you have used recently and Identify the simple machines that make up parts of the complex machine.
Alice and Tom dive from an overhang into the lake below. Tom simply drops straight down from the edge, but Alice takes a running start and jumps with an initial horizontal velocity of 25 m/s. Neither person experiences any significant air resistance. Just as they reach the lake below,
Answer:
The velocity of Alice (25 m/s) will be greater than that of Tom (0), when they reach the lake below.
Explanation:
Given;
initial horizontal velocity of Tom is zero since he dropped straight down from the edge.
initial horizontal velocity of Alice is 25 m/s.
Their respective horizontal velocity when they jumped is the same as when they reach the lake below.
If we compare their velocities when they reach the lake, one will be greater than the other, if we neglect air resistance.
Thus, the velocity of Alice (25 m/s) will be greater than that of Tom (0), when they reach the lake below.
The earth____ around the sun because the earth___ we have night and day
Answer:
The Earth Revolves around the sun because the Earth Tilts, we have night and day.
Explanation:
Hope this helps! <3
Mark has a ball. He tosses it into the air. In 3.7 seconds, it falls to the ground. Why did this happen to Mark's ball? Explain.
Mark's ball falls to the ground because there is a gravitational pull from Earth's core. There are chemicals and elements in the Earth that make this pull. Mark's ball does not stay in the air for this reason.
Hope this helps you!
Answer:
This happened because there is a gravitational pull.
Explanation:
(BRAINLIEST!) Does more momentum mean more force?
Answer:
no.
Explanation:
A 350 kg motorcycle moves with a velocity of 30 m/s. What is its kinetic energy?
10500 Joules
c. 31500 Joules
b. 157500 Joules
d. 900 Joules
Answer:
C 31500
Explanation:
1/2mv*2=KE
k.e= 350× (30)*2
=350×900
k.e= 31500
Select the correct answer.
Which phase in the cell cycle consists of the cell readying itself for its division?
A.
Prophase
B.
Interphase
C.
Anaphase
D.
Metaphase
Answer:
A
Explanation:
The phase of cell cycle consists of the cell readying itself for its division is called prophase of the cycle. It is the first phase in mitosis at which a cell duplicate into two daughter cells.
What is cell cycle?Cell cycle is a biological process by which a cell divide into two genetically identical daughters cells. Prophase is the initial stage of cell division in both mitosis and meiosis. When the cell reaches prophase, DNA replication has already started after interphase.
The chromatin reticulum condenses and the nucleolus vanishes during prophase, which are the key events. Other phases are interphase, anaphase etc. and the last stage is called the telophase.
Cell cycle is a very important biological process by which organisms are producing their offspring. This process differ in each level of organism where for all the starting phase is called prophase.
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A bowling bowl rolls 33m with an average speed of 2.5 m/s how many seconds did the ball roll
1. A car accelerates uniformly from 12 m/s to 39 m/s in 12 seconds. What is the car's average acceleration
2. A butterfly is flying at 4 m/s. It accelerates uniformly at 1.2 m/s for 6 seconds. How far does the butterfly travel during the period of acceleration?
Answer:
(1) 2.25m/s^2
(2) 45.6m
Explanation:
(1) A car accelerates uniformly from 12m/s to 39m/s in 12 seconds
Therefore the average acceleration can be calculated as follows
a = 39-12/12
a = 27/12
a= 2.25m/s^2
(2) A butterfly is flying at 4m/s , it accelerates uniformly at 1.2 m/s for 6 seconds
u= 4
a= 1.2
t= 6
Therefore the distance can be calculated as follows
S= ut + 1/2at^2
= 4×6 + 1/2 × 1.2 × 6^2
= 24 + 1/2 × 1.2 × 36
= 24 + 1/2 × 43.2
= 24 + 21.6
S = 45.6m
Hence the butterfly travels at 45.6m
