¡Can someone help me pls!
How many cubic meters of blood does the heart
pump in a 20 years lifetime?Assume the average
flow rate is 5 L/min.
(5 L/m)x(1,440 m/da)x(365 da/yr)x(20yr)
That's 52,560,000 Liters, or 52,560 m^3.
A person jogs at an average velocity of 3 m/s West. How long will it take this person to run a 30-meter city block?
Answer:
It will take the person 10 seconds to run a 30-meter city block.
Explanation:
To solve this problem, we must remember the formula for velocity:
velocity = displacement/time
If we plug in the values that we are given, we get:
3 m/s = 30 m/time
We can see from the above equation that our answer should be in seconds, so we can get rid of the units to simplify the equation slightly.
3 = 30/t
Next, we can multiply both sides by t:
3t = 30
Then, we should divide both sides of the equation by 3 to get the variable t alone on the left side of the equation.
t = 10
Therefore, the correct answer is 10 s.
1. A runner drops her phone as she is running at a constant speed of 3 miles per hour from point A to point B in a park. Describe the motion of the phone as it is observed by someone sitting on a bench at the park.
Answer:
Let's define the point A as our zero in the x-axis.
As the phone drops, it keeps the horizontal velocity that it had before, so the horizontal velocity is:
Vx = 3 mi/h.
Now, the only force acting on the phone is the gravitational force that acts in the vertical axis, then we have:
Ay = -g
where g = 9.8 m/s^2
It is dropped, so we do not have a vertical initial velocity, then for the vertical velocity we should integrate over time:
Vy = -g*t
And for the position again, we integrate over time, but now we have an initial position H, that is the height at which the phone is dropped.
Py = -(1/2)*g*t^2 + H
And the horizontal position can be found by integrating over time the horizontal velocity.
Px = (3mi/h)*t
This will be the two equations that describe the motion of the phone, and we can not solve it further because we do not know the initial height of the phone.
But in general, we have a linear equation in the horizontal axis and a quadratic equation with a negative leading coefficient in the vertical axis.
Position(t) = ( (3mi/h)*t, -(1/2)*g*t^2 + H)
Answer:
yes he is running at 3 mph
Explanation:
because im the teacher
A block of density 2400kg/m3 has a volume of 0.20m3. Calculate:
a) it’s mass
b) it’s weight
c) it’s apparent weight when completely immersed in a liquid of density 800kg/m3
Answer:
a) mass=density x volume= 2400 x 0,20=480 Kg
b) weight= 480 x 9,81 = 4708,8 N
Find the density of a substance that has a mass of 75g and a volume of 35 mL
Answer:
The density of the substance precisely is 2142.8571428571, but you could always round the answer to something else.
Explanation:
The formula for finding density is ρ (density) equals mass over volume.
75 grams over 35 mL = 2.1428571428571 gram/mL = 2142.8571428571 kilogram/cubic meter.
Hope this helped. :)
A marble accelerates from rest at a constant rate and travels for a total displacement of 44 m in 20.0 s. What is the average velocity of the marble?
Answer:
2.2 m/s
Explanation:
use the formula to find meters per second
The radius of curvature of a spherical mirror is 20cm.What is its focal length?
Answer:
[tex] \boxed{\sf Focal \ length = 10 \ cm} [/tex]
Given:
Radius of curvature (R) of a spherical mirror = 20
To Find:
Focal length (f)
Explanation:
Formula:
[tex] \boxed{ \bold{\sf Focal \ length \ (f) = \frac{Radius \ of \ curvature \ (R)}{2}}}[/tex]
Substituting value of R in the equation:
[tex] \sf \implies f = \frac{20}{2} [/tex]
[tex] \sf \implies f = \frac{ \cancel{2} \times 10}{ \cancel{2}} [/tex]
[tex] \sf \implies f = 10 \: cm[/tex]
Focal length = 10 cm.
Solution :
Given radius of curvature = 20 cm.
Formula :
Focal length = Radius of curvature/2
→ Focal length = 20/2
→ Focal length = 10 cm.
Answer : 10 cm.
Equivalent resistance between A and B.
A) 2.4 ohms
B)18 ohms
C) 6 ohms
D) 36 ohms
First of all see the attachment for better understanding[tex].[/tex] :D
Eq. resistance between C and D :
➝ 1/Rp = 1/6 + 1/6
➝ 1/Rp = 2/6
➝ Rp = 3Ω
Eq. resistance of upper part :
(All three are in series)
➝ Rs = 3 + 3 + 3
➝ Rs = 9Ω
Eq. resistance of lower part :
(Both are in series)
➝ Rs' = 3 + 3
➝ Rs' = 6Ω
Eq. resistance between A and B :
(Rs and Rs' are in parallel)
➝ 1/Req = 1/Rs + 1/Rs'
➝ 1/Req = 1/9 + 1/6
➝ 1/Req = (2 + 3)/18
➝ Req = 18/5
➝ Req = 3.6ΩAnswer:
Explanation:
Eq. resistance between C and D :
➝ Rp = 3Ω
Eq. resistance of upper part :
➝ Rs = 9Ω
Eq. resistance of lower part :
➝ Rs' = 6Ω
Eq. resistance between A and B :
➝ Req = 18/5
➝ Req = 3.6Ω
Your microwave will not turn on, and you speculate that a circuit breaker in the house has been tripped. In scientific terminology, the steps would be described as:
Answer:
Your microwave will not turn on, and you speculate that a circuit breaker in the house has been tripped. In scientific terminology, the steps would be described as: developing a hypothesis based on an observation.
A charge of 12c passes through an electroplating apparatus in 2 min, what is the average current?
Answer:
Explanation:
If I am not wrong
current = charge/time
All you have to take care of is the units should be in the same system
so
current = 12/(2*60) --------- 2 min = 2*60 sec
current = 12/120 = 0.1 amp
simple question..
Is speed the same as velocity?
Answer: no
Explanation: speed = rate of change of distance; distance/time
velocity = rate of change of displacement; displacement/time
the image formed by a convex mirror of focal length 30 cm is a quarter of the length of the object the distance of the object from the mirror is
Answer:
The answer to the question is 90 cm i.e the object distance is 90 cm from the mirror.
CALCULATION:
As per the question, the focal length of the convex mirror f = 30 cm.
The magnification is: 1/4
We are asked to calculate the object distance [u].
As per the sign convention for reflection, the measurements taken along the direction of light is taken as positive and its reverse is taken as negative.
The transverse measurement above the principal axis is taken as positive and below the principal axis is taken as negative.
Hence, the focal length of the convex mirror f = +30 cm.
The image formed by a convex mirror is virtual and erect.
Hence, the magnification will be positive.
Hence, magnification m = +1/4=+0.25
The relation between focal length, magnification and object distance is given as -
m= f/f=u
u= m=1/m multiplyed by f
= 0.25=1/0.25 multiplyed by -(30)
= -90 cm [ans]
Here, the negative sign is due to the fact that object distance is measured opposite to the direction of light.
(sorry, brainly didn't allow me to put pictures of the calculation)
hope this helps :)
A person lifts a load of 60kg ustag a wheel and axle
Of VR 3. If the diameter of the axle is 5 cm, find the
radius of the wheel, MA and effort applied . Also find
its efficiency
Explanation:
Hope it will help you alot.
what does it mean to have a good experimental design?
Answer: Experimental design means creating a set of procedures to test a hypothesis. A good experimental design requires a strong understanding of the system you are studying. By first considering the variables and how they are related (Step 1), you can make predictions that are specific and testable (Step 2).
Explanation:
1. Hydroelectric ____________ come from the energy of fallen water.
2. Using fossil fuels is the main reason of global ___________
3. Turning off the lights, TV and computer when we aren't using them is a way to _________, or save energy.
4. Energy efficient light bulbs use ___________ energy than normal light bulbs.
5. ________ is made from trees.
6. _______ energy comes from things besides fossil fuels.
7. You can ________ or bike to school instead of driving.
8. Most of the energy we use around the world comes from _______ ________.
Please answer these quickly. I'm tired.
Answer:
1.Power
2.warming
3.preserve
4.less
5.Paper
6.Fossil
7.ride cycle
8.Non renewable energy sources
Please check it once and reply
what is the main aim of pokhara regional international airpot project
Answer:
Explanation:
The main aim of pokhara regional international airpot project is to provide improved air transportation services to the people. It will also strengthen the country's civil aviation sector and contribute to economic and social development, as well as tourism.
hope this helps
plz mark as brainliest!!!!!!
The main aim of Pokhara regional international airport project is to improve the country's aviation services and contribute to economic and social development as well as tourism.
When a force is acting at axis of rotation,why torque is zero?
Explanation:
see, torque=force × perpendicular distance
...that perpendicular distance is between axis of rotation and the point where force acts... so in above's case perpendicular distance is zero... so the torque is zero!
A box with a mass of 15 kg is pushed with a net force of 180 N. What magnitude of acceleration will the box experience?
[tex] \huge{ \underline{ \underline{ \red{ \bf{Solution:}}}}}[/tex]
We know that, Newton's second law of motion states that Force is the product of mass and Accleration which is actually derived from the original statement, Rate of change of momentum is directly proportional to Force applied and acts in the same direction of force.
According to this,
[tex] \large{ \cdot{ \boxed{ \rm{f = m \times a}}}}[/tex]
Where,
F = Force appliedm = mass of the bodya = acceleration of the bodySo, By using formula,
➝ F = m × a
➝ 180 N = 15 kg × a
➝ 15a = 180
➝ a = 180/15 = 12 m/s²
❍ Accleration of the body = 12 m/s²
Hence, solved !!
━━━━━━━━━━━━━━━━━━━━
[tex]\tt {\pink{Given}}\begin{cases} \sf{\green{Force=180 \: newtons}}\\ \sf{\blue{Mass=15 \: kg}}\\ \sf{\orange{Acceleration= \: ?}}\end{cases}[/tex]
____________________Answer:
[tex]\qquad \: \tiny\dag\:\underline{\tt By \: applying \: Newtons \: second \: law \: of \: motion \: we \: get : } \\ \\ [/tex]
[tex]:\implies\sf F = ma \\ \\ [/tex]
[tex]\tt {\pink{Where}}\begin{cases} \sf{\green{F=Force}}\\ \sf{\blue{m=Mass}}\\ \sf{\orange{a=Acceleration}}\end{cases}[/tex]
This law states that, "the rate of change of momentum of a body is directly proportional to the external force applied on the body and the change takes place in the direction of applied force" :][tex]\qquad\tiny\dag\:\underline{\tt Now,substituting\: the \: given \: values \: in \: above \: Formula \: we \: get :} \\ \\ [/tex]
[tex]:\implies\sf 180 = 15 \times Acceleration \\ \\ \\ [/tex]
[tex]:\implies\sf Acceleration = \dfrac{180}{15} \\ \\ \\ [/tex]
[tex]:\implies \underline{ \boxed{\textsf{ \textbf{ Acceleration = 12 m/s$^2$ }}}} \\ \\ \\ [/tex]
[tex]\therefore\underline{\textsf{ Acceleration produced by the box is \textbf{12 m/s$^2$}}}. \\ [/tex]
write a brief note on gravitational force
Answer:
[tex] \boxed{ \boxed{ \sf{see \: below}}}[/tex]
Explanation:
[tex] \underline{ \bold{ \underline{ \huge{ \boxed{ \sf{gravitational \: force}}}}}}[/tex]
------------------------------------------------------------------
According to Newton, the bodies in the universe attract each other. This force if attraction is called force of gravitation. For example, the earth attracts the moon and the moon attracts the earth too. Similarly, the earth attracts the Jupiter and the Jupiter attracts the Earth.
The effect of force of attraction of a big body on a small body can be observed but that of a small body on a big one cannot be observed. The sun is so large that even the sum of the masses of all its planets and the satellites is only about 0.0015th part of mass of the sun. Due to the gravitational force between the sun and the earth, the earth keeps on moving around the sun. Similarly, the gravitational force between the satellites and planets makes the satellites to revolve around the planets. So, The gravitational force is responsible for the existence of solar system. The effect of gravitation can be experienced more on liquid than solid. Hence, we see tides in the sea and ocean due to the force of gravitation of the moon and the sun on the earth when they lie on the same straight line.
--------------------------------------------------------------------
Hope I helped!
Best regards!!
What is your speed if you travel 7564 km in 23 hours? Convert this to miles per hour.
Answer:
[See Below]
Explanation:
Your average speed would be 204.35 mph.
Match each term to the appropriate definition.
percent error
a mathematical way of showing
accuracy
when two variables both increase or
decrease together
dependent variable
inverse relationship
when one variable increases and the
other variable decreases
direct relationship
what is changed by the researcher
during an experiment
independent variable
what is measured and affected during
an experiment
Answer: In statistics, a perfect positive correlation is represented by the ... variables in question move together by the exact same percentage ... Positive correlation is a relationship between two variables in which both variables move in ... other variable decreases, or one variable increases while the other increases.
Explanation:
make me a brainlist and like and rate
Percent error is a mathematical way of showing accuracy, dependent variable is what is measured and affected during the experiment, independent variable is what is changed by the researcher.
What is Percent error?Percent error is the difference between the estimated value and the actual value in comparison to the actual value of the experiment and is expressed as a percentage value. In other words, the percent error is the relative error multiplied by the number 100.
Direct relationship is a relationship between any two variables whereby both the variables increase or decrease together. Directly affect each other.
Inverse relationship is a relationship between any two variables whereby one variable increases and the other variable decreases. The variables affect each other but inversely.
An independent variable is the variable which is changed by the researcher through the experiment.
A dependent variable is the variable which is measured and affected during the experiment and it often described as being dependent on the independent variable of the experiment.
Learn more about Errors here:
https://brainly.com/question/19575648
#SPJ6
Define uniform circular motion and state an
expression for velocity of the body performing
whiform circular motion
Definition: When an object moves in a circular path with uniform speed, the motion is called uniform circular motion.
ac=rv2=ω2r
what happens when you dip open bottle in bucket full of water?why?
chapter=pressure
Answer: It goes inside filling most of it .
Explanation: This happens because the bottle is empty and the bucket is full of water.
Using the following equation, find in seconds 145m = 9 m/s x t-35m
Answer:
t = 20 s
Explanation:
145 m = 9 m/s × t – 35m
We can obtain the value of t in seconds by doing the following:
145 m = 9 m/s × t – 35m
Add 35 m to both side as shown below:
145 m + 35 m = 9 m/s × t – 35m + 35 m
180 m = 9 m/s × t
Divide both side by 9 m/s
t = 180 m / 9 m/s
t = 20 s
Therefore, the value of t is 20 seconds.
88 L + 120 dL = _____________ L
100 l
Explanation:1 dl = 0.1 l
120 dl = 120×0.1l = 12 l
88 l + 12 l = 100 l
Derive the unit of intensity???
My answer is "Watt per square meter".
What did Blaise Pascal discover, and how did he impact Physics?
Answer:
Well it really depends because he found out about a lot of things in a lot of scientific fields actually. He is known for contributing Pascal's triangle and probability theory. He also invented an early digital calculator and a roulette machine. In the field of physics, Blaise contributed to the study of atmospheric pressure by discovering that vacuums are real and exist in the real world.
Answer:
Well it really depends because he found out about a lot of things in a lot of scientific fields actually. He is known for contributing Pascal's triangle and probability theory. He also invented an early digital calculator and a roulette machine. In the field of physics, Blaise contributed to the study of atmospheric pressure by discovering that vacuums are real and exist in the real world.
Explanation:
Which of the following is not accelerating? Q) A. a car coming to a stop a t a traffic light B. a sprinter starting from rest and running 100 min 9.8 s C. a racecar traveling 175 km/ hr on a straight track D Which of the following is not accelerating? Q) A. a car coming to a stop a t a traffic light B. a sprinter starting from rest and running 100 min 9.8 s C. a racecar traveling 175 km/ hr on a straight track D an airplane traveling at 500 km/hr and turning to the north
Answer
A. a car coming to a stop at a traffic light
Which statement describes the Oort cloud?
O It is shaped like a donut.
O It contains huge icy objects.
O It is home to short-period comets.
O It is about 1,000 AU from the Sun.
The statement which best describes the Oort cloud is that it contains huge icy objects and is therefore denoted as option B.
What is a Cloud?This is referred to as the mass of water drops or ice crystals suspended in the atmosphere and are of different types such as oort, cumulus etc. It is also involved in rain formation in the ecosystem.
Oort cloud on the other hand is defined as a hypothetical, spherical distribution of icy bodies located in the far reaches of the Solar system which is therefore the reason why option B was chosen as the correct choice.
Read more about Cloud here https://brainly.com/question/508705
#SPJ1
Answer:
it’s B
Explanation: I got it right
What is the elevator's average acceleration from t = 2 to t= 8? Leave your answer in 3 significant figures.
Answer:
Average Acceleration = 0 m/s²
Explanation:
The average acceleration between t = 2 sec to t = 8 sec is given as follows:
Average Acceleration = (Final Velocity - Initial Velocity)/Total Time
From Graph,
Total Time = 8 sec - 2 sec = 6 sec
At t = 2 sec
Initial Velocity = 3 m/2 s = 1.5 m/s
At t = 8 sec
Final velocity = 12 m/8 s = 1.5 m/s
Therefore,
Average Acceleration = (1.5 m/s - 1.5 m/s)/ 6 s
Average Acceleration = 0 m/s²