Answer:
Average speed = 13.5 m/s
Explanation:
Since the car is running at a speed of 27 m/s and it stops after 3 seconds by applying the brake. Therefore, the initial speed of the 27 m/s and final speed is 0.
Use below formula to find the average speed :
Average speed = (Initial speed + final speed ) / 2
Average speed = (27 + 0 ) / 2
Average speed = 13.5 m/s
These bacteria use chemicals and heat in the water to make their own food are classified as
Answer: Autotrophs
Explanation: Autotrophs make their own food from nature. They do not depend on other creatures for food
¡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.
5 words to describe mass science
Answer:
Scientific Definition of Mass. Mass is the quantity of inertia (resistance to acceleration) possessed by an object or the proportion between force and acceleration referred to in Newton's Second Law of Motion (force equals mass times acceleration). In other words, the more mass an object has, the more force it takes to get it moving.
Explanation:
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
456.7 in scientific notation
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.
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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!
1. Simplify the following expression
8-6/4-12+3^2
Answer:
-5/2
Explanation:
8-6/4-12+3^2
8-6/4-12+9
2/4-12+9
LCM =4
(2-48+36)/4
(-46+36)/4
-10/4
-5/2
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.
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
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
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.
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.
please help
will give the brainliest!
please answer correctly.
Urgent!!!!!!!!!!!!
a) Live wire
b) It has gained extra electrons.
c) Part of circuit can be turned off while other parts remain on.
d) [tex] R=\frac{V}{I}=60 \Omega[/tex]
A car speeds up from rest to some final velocity in some amount of time. If the time is doubled to reach the same final velocity, what
happens to the acceleration? Is this a proportional or inversely proportional relationship?
If the time is doubled to reach the same final velocity, then the acceleration will be half the acceleration before.
What is the rate of change?The rate of change of an object's velocity with respect to time is defined as acceleration. Vector quantities are accelerations.
Let's assume the final and the initial velocity of the object is v and u, respectively. Also, the time it takes is represented by t. Therefore, the acceleration can be written as,
a₁ = (v-u)/t
Now, if the time is doubled then the acceleration can be written as,
a₂ = (v-u)/2t
= (1/2) × [(v-u)/t]
= 0.5 × a₁
a₂ = 0.5a₁
Hence, If the time is doubled to reach the same final velocity, then the acceleration will be half the acceleration before.
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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.
Position vs Time
Based on the information presented in the graph, what
is the velocity of the object?
15
m/s
12
Position (m)
3
0
1
2
3
4
5
Time (s)
) Intro
Done
Answer:
3
Explanation:
just did it
90. An uranium nucleus (at rest) undergoes fission and splits into two fragments, one heavy and the other light. Which fragment is moving faster after the fission?
Answer:
Explanation:
No external force is acting on uranium nucleus so we can apply law of conservation of momentum . If M and m be the mass of bigger and smaller fragments respectively and V and v be their velocity after fission , Total momentum after fission = total momentum before fission
MV - mv = 0 , since the nucleus was at rest , its momentum before fission is zero . negative sign of mv is taken because smaller fragment will move in opposite direction to that of bigger fragment .
MV = mv
M / m = v / V
M > m
Hence,
v > V
So velocity of smaller fragment will be higher .
Pls with a clear explanation
Explanation:
We know that :
[tex]P = \frac{V^{2} }{R} [/tex]
Resistance of Bulb :
[tex]R = \frac{ V^{2} }{P } = \frac{ {(240)}^{2} }{280} = 205.71 \: ohms[/tex]
As per Ohms laws :
Current when (V = 200)
[tex]i \: = \frac{ V}{ R} = \frac{200}{205.71} = 0.97 \: A[/tex]
what is the kinetic energy of a body mass 5kgwhich moves with velocity of 4m/s
Answer:
The answer is 40 JoulesExplanation:
The kinetic energy of a body can be found by using the formula
[tex]KE = \frac{1}{2} {mv}^{2} [/tex]where
m is the mass
v is the velocity
From the question
mass = 5 kg
velocity = 4 m/s
Substitute the values into the above formula and solve
We have
[tex]KE = \frac{1}{2} \times 5 \times {4}^{2} \\ = \frac{1}{2} \times 5 \times 16 \\ = 5 \times 8[/tex]We have the final answer as
40 JoulesHope this helps you
All but one of the following are studies done in sociology. Which one best illustrates a study done in psychology? A. a study that shows how Marissa’s study habits change when she is at the library with her friends B. a study that shows how Joey’s clownish behavior only occurs when he is around his peers C. a study that shows how Katrina’s stress levels contribute to her obsessive exercise habits D. a study that shows how Lisa’s obsession with snowboarding is caused by her group of friends
Answer:
i believe its c
Explanation:
I took the test
The one best illustrates a study done in psychology is a study that shows how Katrina’s stress levels contribute to her obsessive exercise habits. The correct option is C.
What is psychology?Psychology is the scientific study of human mind and his behavior on various situations. It includes the study of conscious and unconscious phenomena, feelings and emotions attached to some person or a habit.
The psychology deals with the stress levels which make up the wrong habits. This may be caused due to overthinking, one starts to push himself more and more. He wants to stress out to manage this stress and does the exercise obsessively.
So, the study how Katrina’s stress levels contribute to her obsessive exercise habits is an example of psychology study.
Thus, the correct option is C.
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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
Which is the correct acceleration vs. time graph for the velocity vs. time graph shown in (Figure 8)?
Answer:
The correct option is the second option with horizontal bars at a = 6, a = -1, and a = 4 m/s²
Please find attached the table of values and a graph representing the correct option
Explanation:
The given data can be presented as follows;
Time (s), Velocity (m/s), Acceleration (m/s²)
0, -1, 6
0.5, 2, 6
1, 5, 6
0, 5, -1
0.5, 4.5, -1
1, 4, -1
1.5, 3.5, -1
2, 3, -1
2.5, 2.5, -1
3, 2, -1
0, 2, 4
0.5, 4, 4
1, 6, 4
1.5, 8, 4
2, 10, 4
From the data, and the graph the acceleration for the period from the time t = 0 to t = 1 is 6 m/s²
From t = 1 to t = 4, the acceleration is constant and equal to -1
From t = 4 to t = 6 the acceleration is also constant and equal to 4
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]
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
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. :)
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:
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
Which statement explains the relationship between the density of a material and its movement in Earth’s interior?
A.Cooler materials move from Earth’s mantle to the lithosphere.
B.Cooler materials are highly dense, causing them to sink to the outer core.
C.Warmer materials sink to the mantle because their density slowly decreases. D.Warmer materials have a high density, causing them to rise to Earth’s surface.
B) Cooler materials are highly dense, causing them to sink to the outer core.
Answer:
the answer is B i did the test
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]
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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.
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