Answer:
Explanation:
time= distance/speed
20km/ 15km/h
= 1 1/3 hours (4/3 in mixed fraction)
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:
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?
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.
Assuming that the hill on the left will provide all of the potential energy for the ride, would this roller coaster actually make it around the loop?
Thanks!
No, this roller-coaster would not able to make it around the loop because the hill would need to be higher than the loop's highest part,
The potential energy stored in the roller coaster from the first hill is not sufficient to make around-the-loop.
What is mechanical energy?The sum of all the energy in motion (total kinetic energy) and all the energy that is stored in the system (total potential energy) is known as mechanical energy.
The expression for total mechanical energy can be given as follows
ME= PE + KE
The roller coaster would not be able to complete the loop because the hill would need to be higher than the highest point of the loop, and the potential energy stored in the roller coaster from the first hill would not be enough to complete the circle.
Therefore, the correct answer is option A.
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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.
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 formula gives the value of velocity ratio of wheel and axle?
Answer:
measurement of force amplification
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.
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:
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
Convert 459 L into milliliters
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.
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.
Examples of increase in pressure due to increase in applied force
Answer:
injecting
Explanation:
(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
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 swimmer swims a half lap, moving from the left end to the right end of a pool that is 50 meters long. What is the Distance and Displacement?
Distance = 50m
Displacement = 50m to the right
Explanation:Distance is the total length of a given path. It is a scalar quantity and thus takes no consideration on the direction of the path.
Displacement on the other hand is the change in position of an object. It is a vector quantity and takes consideration on the direction of the object.
From the question:
The swimmer swims half lap by moving from the left end to the right end of a pool that is 50m long.
Distance = total length of the given path = 50m
Displacement = change in position of the swimmer from the left end (0m) to the right end (50m) = 50 - 0 = 50m
Since direction is important in displacement, the complete details of the displacement should be 50m to the right
Answer:
The distance is 50m and the displacement is also 50 m
Explanation:
the swimmer traveled 50m =distance
the swimmer was now 50m away from the start=displacement
An airplane is trying to land on the runway using the path below. Vectors and Scalars Questions – NAT 5 What is the total distance traveled by the airplane? m What was the magnitude of the airplane's displacement? m What was the direction of the airplane's displacement? Please abbreviate
Explanation:
The attached image shows the path followed by an airplane that is trying to land. From the figure, it can be seen that initially, its position was 200 m due east, then 150 m due south, 200 m due west, 250 m due south.
(a) The total path covered during its entire journey is called distance.
D = 200 m+150 m+200 m+250 m
D = 800 m
(b) The shortest path covered by an object is called displacement of an object. The shortest path covered is shown by red color. It means that displacement is (150+250) m = 400 m
(c) It is clear from the figure that, the Airplane's displacement is in the south direction.
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 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.
?:]
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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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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If a car races around a 2.3 mile oval track 220 times, what is the displacement of the car in meters when it crosses the finish line.
Answer: 0 miles.
Explanation:
First let's define what the displacement is:
The displacement is defined as the difference between the final position and the initial position.
So, if for example, you start at your house, then go to a store, and then go back to your house, your total displacement will be zero, because the initial position and the final position are the same.
Then when the car reaches the final line, it will be in the same place that it started (because this is an oval track, so the finish line connects with the starting point)
Then the total displacement is 0miles.
. You move at 3 m/s north, then at 5 m/s directly west.
Answer:
Explanation:
The question is incomplete. Here is the complete question.
You move at 3 m/s north, then at 5 m/s directly west. Find your displacement.
The displacement is the distance moved in a specified direction. If you first move 3m/s due to north, this means you moved in the positive y direction hence we can say that y = 3m/s. Then if you move 5m/s directly due west this means you moved in the negative x direction hence we can say that x = -5m/s. The displacement will be gotten using the pythagoras theorem as shown.
D² = x²+y²
D² = (-5)²+3²
D² = 25+9
D = √34 m/s
Hence your displacement is √34 m/s and the total distance covered is 3m/s + 5m/s = 8m/s
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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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
7. Mrs. Everhart developed the theory that all bulldogs are great pets. After all her bulldog Meatball is a
wonderful dog! Is this statement a scientific theory? Why or why not.
finoccientific method
Answer: No.
Explanation:
A scientific theory is an explanation of some aspect of the natural world that can be tested several times, and follows the scientific method. And, when possible, theories are tested with experiments.
Now, a scientific theory must meet some criteria, and one of those is that it must be supported by several (and independent) strands of evidence.
In this case, we have only one, Meatball, and it is not enough, then it can not be a scientific theory.
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:
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.