A long distance runner sees the finish line and accelerates at a rate in 1.2 m/s2 for
the last 3 seconds to win the race. If he was initially running at speed of 3.2 m/s,
how far did he travel?
Answer: he did travel 15 meters.
Explanation:
We have the data:
Acceleration = a = 1.2 m/s^2
Time lapes = 3 seconds
Initial speed = 3.2 m/s.
Then we start writing the acceleration:
a(t) = 1.2 m/s^2
now for the velocity, we integrate over time:
v(t) = (1.2 m/s^2)*t + v0
with v0 = 3.2 m/s
v(t) = (1.2 m/s^2)*t + 3.2 m/s
For the position, we integrate again.
p(t) = (1/2)*(1.2 m/s^2)*t^2 + 3.2m/s*t + p0
Because we want to know the displacementin those 3 seconds ( p(3s) - p(0s)) we can use p0 = 0m
Then the displacement at t = 3s will be equal to p(3s).
p(3s) = (1/2)*(1.2 m/s^2)*(3s)^2 + 3.2m/s*3s = 15m
The value of atmospheric pressure at sea level
Answer:101.325 kilopascals
Explanation:
Which option is a potential environmental benefit of adopting a new
technology?
Answer:New technology can provide cleaner energy for the environment
Can also help clean the environment.
Explanation:
Which option is potentially environmental benefit of adopting a new technology?
what oversimplified assumption does the graph make about number of types of products the society produces?
Answer:
CAN'T UNDERSTAND YOUR QUERY
Explanation:
What is your qurey. plz explain properly.
A new born baby weights 7.15 lbs how many meters is that
Answer: 114.543 i think
8. Do you need to show your work on ANY problem that requires a calculation to receive full credit?
Yes
No
Answer:
Yes
Explanation:
How many nanoCoulombs are there in a milliCoulomb
Answer:
1 millicoulomb = 1000000 nanocoulombs.
Explanation:
The SI unit for electric charge is Coulomb.
1 coulomb = 1000000000 nC (nanocoulombs)
1 coulomb = 1000 mC (millicoulombs)
Which of the following is an example of a projectile? A Dropped ball B. Airplane C Missile D. Bird
I guess a missile?
A bird is not a projectile, a ball isn't really, and an airplane isn't, so, yeah.
?:]
According to cell theory, where do new cells come from?
Choose 1 answer:
(Choice A) A Carbohydrate evolution
(Choice B) B Cell division
(Choice C) C Spontaneous generation
(Choice D) D Cell fusion
Answer:
B
Explanation:
New cells come from something called cell division
Answer:
Cell division
Explanation:
The heart belongs to which body system? nervous O cardiovascular O digestive O endocrine
Answer:
The heart belongs to the Cardiovascular system. Along with blood vessels and the blood.
Which is one piece of information that astronomers use to calculate the age of the universe?
Answer:
the age of the oldest stars patterns of background radiation how fast distant galaxies are moving away from usExplanation:
According to the NASA, astronomers can estimate how old the universe is by comparing the age of the oldest stars and the rate of expansion of the universe. The rate of expansion of the universe is based on the Big Bang theory and it states that our universe is continuously expanding since it first developed. Astronomers measure Cosmic Microwave Background radiation resulting from the Big Bang.
Answer:
Patterns of background radiation
Explanation: well astronomy states that they are able to tell by the radiation gaps
Christina drives his moped 7 kilometers North. She stops for lunch and then drives 5 kilometers East. What distance did she cover? Please include the number and unit. 8.6 km What was the magnitude of her displacement? Please include the number and unit. What was the direction of her displacement? Please abbrieviate (N, S, E, W, etc.)
Answer:
She covers the distance is 12 km.
The magnitude of displacement is 8.6 km.
The direction of her displacement is north east.
Explanation:
Given that,
Christina drives his moped 7 kilometers North and stop for lunch and then drive 5 km east.
We need to calculate the total distance
Using formula of distance
[tex]d=d_{1}+d_{2}[/tex]
Put the value into the formula
[tex]d=7+5[/tex]
[tex]d=12\ km[/tex]
We need to calculate the magnitude of displacement
Using formula of displacement
[tex]D=xi+yj[/tex]
[tex]D=5i+7j[/tex]
[tex]D=\sqrt{5^2+7^2}[/tex]
[tex]D= 8.6\ km[/tex]
The direction of her displacement is north east.
Hence, She covers the distance is 12 km.
The magnitude of displacement is 8.6 km.
The direction of her displacement is north east.
Must be 8 letters (Dimensional Analysis escape room)
Answer: A-B-C-E-G-K-H-I
Explanation:
Ok, we start at A.
16 pints = x gallons.
We know that:
1 pint = 0.125 al
then:
16pint = 16*(0.125gal) = 2 gal.
The second letter is B.
Now we have:
12,320 yd = X mi
And we know that:
1 mi = 1760 yd.
Then 12,320yd = (12,320/1760) mi = 7mi
the letter is C.
Now we have:
432 cups = X gals
and:
1 cup = 0.0625 gal
then 432 cups = 432*(0.0625 gal) = 27 gal.
The next letter is E.
Now we have:
1/4 ton = X pounds.
And 1 ton = 2000 pounds
then 1/4 ton = (1/4)*2000 pounds = 500 pounds
The next letter is G.
Now we have:
3.5 gal = X ounces.
and we know that:
1 gal = 128 oz
Then:
3.5 gal = 3.5*(128oz) = 448oz
The next letter is K.
Now we have:
1/2 day = x minutes.
and we know that:
1 day = 24*60 min = 1440 min
then 1/2 day = (1/2)*1440 min = 720 min.
The next letter is H.
Now we have:
360 in = x yd
And we know that:
1yd = 36 inches.
then 360 in = (360/36) = 10 yd.
The next letter is I
Now we have:
56 cups = x quarts.
and we know that;
1cup = 0.25 quart
then: 56 cups = 56*0.25 quart = 14
So here this ends.
Then the code is:
A-B-C-E-G-K-H-I
A remote-controlled, pilot-operated ___ valve is type of pilot-operated relief valve that uses one or more external pilot valves to set the pressure at which the relief valve will open.
Answer:
A remote-controlled, pilot-operated _Relief__ valve is type of pilot-operated relief valve that uses one or more external pilot valves to set the pressure at which the relief valve will open.
It takes a person 22 seconds to swim in a straight line from the south end of the pool to the north end of the pool a distance of 28 meters. What is the swimmers velocity? A. 0.8 m/s south b. 1.3 m/s north C. 1.3 m/s north D. 0.8 me north
Answer:1.3 m/s north
Explanation:
just did it on apex
Which statements accurately describe elements? Check all that apply
Answer:
Elements are made up of only one type of atom. Each element has a unique chemical symbol. Elements can be identified by their atomic number.
Examples of increase in pressure due to increase in applied force
Answer:
injecting
Explanation:
Which characteristic is shared by extrusions, intrusions, and faults?
O
All are cracks.
All are igneous rocks.
O All cause gaps in the geologic record.
All are younger than surrounding rocks.
Answer:D
Explanation:
The characteristic shared by extrusions, intrusions, and faults is all are younger than surrounding rocks.
The correct option is fourth.
What is extrusion?Extrusion is a process of extruding.
Intrusion is the process of intruding. The forced entry of molten rock or magma into two different rock formations. It is also the intruded magma.
The movement of magma over the surface of the Earth coming out through volcano craters and cracking in the earth's crust forms igneous rock.
The characteristic shared by extrusions, intrusions, and faults is all are younger than surrounding rocks.
The surrounding rocks are already present. After that the entry of magma occurs which forms new rock. So, in age surrounding rocks are older than the middle.
Thus, the correct option is fourth.
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(3.8 × 10−6)(2.37 × 10−3)
Answer:
0.000000009006 or 9.006 x 10^-9
Explanation:
0.0000038 x 0.00237 = 0.000000009006 or 9.006 x 10^-9
15. Write down your height in feet and inches):
a. Determine your height in inches.
I
b. Determine your height in centimeters.
c. Determine your height in yards.
Answer:
example 5foot 5in
a)65
b)165.1
c) 1.83
Explanation:
a) multiply the amount of feet by 12. thats 60. then add the extra 5 inches. 65 inches in total.
b) multiply your previous answer by 2.54. (there are 2.54 centimeters for every inch) the answer is 165.1
c) a yard is three feet. divide 5foot 5 by 3.
Which of the following . is a result of the transfer of energy?
A
gravity
B
sound
с
magnetis
D
matter
Answer:
magenicts sshbsunuwi
Explanation:
Option B (Sound) is the appropriate choice.
There are surface and groundwater vibrations that cause individual eardrums to vibrate, causing the sensory organ to be felt, which is considered as a Sound.
The other given alternatives such as:
Gravity - A force that seeks to bring two items together, is gravity. Gravitational influence is a property of all objects with weight.
Magnetism - Magnetism seems to be the force that magnetically exerts whenever they approach as well as repelled each other.
Matter - Material or materials from which a thing is usually made, is a matter.
These three choices are not related to the given question. Thus the above is the right answer.
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Which of the following is an example of technology influencing science?
A.Use of recording devices to view the growth of plants.
B.Use of X-ray machines for airport security.
C.Invention of the microscope to observe cells.
D.Invention of the thermometer to measure heat.
Answer:A and C
Explanation:
Answer:
a
Explanation:
Neglecting air resistance, which of the following statements is true regarding an object in freefall?Lector inmersivo A. An object’s acceleration increases at a constant rate. B. An object maintains a constant velocity. C. An object falls an equal distance in between each second. D. An object’s velocity and acceleration both increase at a constant rate. E. An object’s velocity changes at a constant rate, and its acceleration remains constant.
Answer:
E. An object’s velocity changes at a constant rate, and its acceleration remains constant.
Explanation:
When an object is in freefall, it implies that the object is falling freely under gravity. If it falls towards the earth surface, the fall is in the direction of the Earth's gravitational force.
At the point of release of the object, its initial velocity is zero because it is at rest. But when released, its velocity increases at a constant rate until it is acted upon by an external force. But its acceleration remains constant, acceleration due to gravity.
If multiple measurements are taken and they vary quite a bit from each other, the measurements are
Answer:
precise
Explanation:
usatestprep
The degree of agreement between two or more measurements is what is referred to as a substance's precision. Your measurement is incredibly exact, but not necessarily correct if you weigh the same substance five times and obtain 3.2 kg each time.
What precision vary quite a bit from each other?The level of agreement between measurements of the same thing is known as precision. Accuracy is not necessary for precision. In other words, it is possible to be accurate without being exact, as well as to be highly precise but not particularly accurate.
As was mentioned before, you can be extremely exact but inaccurate. You can also be precise while being inaccurate. For instance, you have accuracy without precision if, on average, your measurements for a specific substance are close to the known value, but the measurements are far apart.
Therefore, The standard deviation, or the amount and frequency of measurement variation, is what determines precision. A high standard deviation indicates low precision, according to the metric.
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What is the kinetic energy of a 7.56 kg bowling ball that is rolling at a speed of 2 m/s ?
Answer:
K.E=?
Mass=7.56 kg
Velocity=2m/s
Solution::
K.E = 1/2mv^2
K.E=0.5*7.56*(2)^2
K.E= 0.5*7.56*4
K.E=15.12 joules.
describe the motion of an object has an acceleration of 0 m/s2
Answer:
The object is either traveling at a constant speed or is not moving.Explanation:
It is not possible for the position of an object to be changing and the acceleration to be zero. Acceleration is the change in velocity divided by the change in time.There are only two possible situations if the motion of an object has an acceleration of 0 m/s²,
Either the object is at rest or the object is moving at a uniform velocity
What is acceleration?The rate of change of the velocity with respect to time is known as the acceleration of the object. Generally, the unit of acceleration is considered as meter/seconds².
As we know the rate of change of velocity is known as acceleration
acceleration =change in velocity/change in time
As given in the problem statement the motion of an object has an acceleration of 0 m/s²
Considering that every moving particle has zero overall acceleration. The particle will then experience zero overall applied force.
Newton's first law states that if all forces acting on a moving object are equal to zero, the object will be traveling in a straight line at a constant speed.
When there is no acceleration, the particle's motion will continue in the same direction. Additionally, the particle's velocity will not remain constant if the direction of motion changes.
Thus, If an object's motion has an acceleration of 0 m/s², there are only two possible outcomes: either the object is at rest or it is moving at a constant speed.
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Convert 459 L into milliliters
If, as is typical, each of them breathes about 500 cm3 of air with each breath, approximately what volume of air (in cubic meters) do these astronauts breathe in a year
Answer:
a) 12614.4 m^3
b) 28.8 m
Explanation:
The complete question is
Four astronauts are in a spherical space station. (a) If, as is typical, each of them breathes about 500 cm^3 of air with each breath, approximately what volume of air (in cubic meters) do these astronauts breathe in a year? (b) What would the diameter (in meters) of the space station have to be to contain all this air?
The average breathing rate is 12 breaths per minute
there are 60 minutes x 24 hours x 365 days in a year = 525600 minutes in a year
if an average human takes 12 breath per minute, then in a year an average human take 12 x 525600 = 6307200 breath
For the four astronauts, the amount of breath = 4 x 6307200 = 25228800 breath in total.
The volume of air per breath = 500 cm^3
1 cm^3 = 10^-6 m^3
500 cm^3 = [tex]x[/tex] m^3
[tex]x[/tex] = 500 x 10^-6 = 5 x 10^-4 m^3
Therefore in a year, the volume of these astronauts breath in a year = 5 x 10^-4 x 25228800 = 12614.4 m^3
b) If the space station is spherical, the volume will be given as = [tex]\frac{4}{3} \pi r^3[/tex]
where r is the radius of the space station
This volume of the space station must be able to contain all the volume of breath produced by the astronauts which is = 12614.4 m^3
Equating, we have
12614.4 = [tex]\frac{4}{3} \pi r^3[/tex]
12614.4 = [tex]\frac{4}{3}*3.142*r^3[/tex]
12614.4 = 4.1893[tex]r^{3}[/tex]
[tex]r^{3}[/tex] = 12614.4/4.1893 = 3011.1
r = [tex]\sqrt[3]{3011.1}[/tex] = 14.4 m
diameter of the space station = 14.4 m x 2 = 28.8 m
Jennifer, who has a mass of 50.0 kg, is riding at 35.0 m/s in her red sports car when she must suddenly slam on the brakes to avoid hitting a deer crossing the road. She strikes the air bag, that brings her body to a stop in 0.500 s. What average force does the seat belt exert on her
Answer:
Average force = 3.5 kN
Explanation:
Given:
Mass of Jennifer (m) = 50 kg
Initial velocity = 35 m/s
Time taken to stop body = 0.5 s
Find:
Average force
Computation:
v = u + at
0 = 35 + a(0.5)
Acceleration (a) = - 70 m/s² = 70 m/s²
Average force = ma
Average force = (50(70)
Average force = 3500 N
Average force = 3.5 kN
which formula gives the value of velocity ratio of wheel and axle?
Answer:
measurement of force amplification