Answer:
M = ρ V = 9 gm/cm^ 3 * cm^3 = 27 gm
a = (V2 - V1) / t = (6 - 2) m/s / 12 s = 1/3 m/s^2 the acceleration
F = M a = 27 gm * 1/3 m/s^2 = 9 dynes net force applied
L4 What is meant by the internal energy of an object?
Answer:
Internal energy is all the energy contained in an object, including both kinetic energy and potential energy
What is the current in a 160 V circuit if the resistance is 2
V= IR
160 = I × 2
80 A = I = current
Answer:
80 A
Explanation:
by ohm's law, resistance is equal to the change in voltage over the current so if we plug and solve for current we get I = (160V)/(2V/A)= 80 A
What is the difference between a sonic boom and a shock wave?
Answer:
When a sound source moves faster than the speed of sound, a shock wave is produced as the sound waves interfere. A sonic boom is the intense sound that occurs as the shock wave moves along the ground.
More importantly, all of the energy gets concentrated into a very small distance this is called a shock wave. In this case, the observer does not hear the approaching source at all until the shock wave hits with all of the energy in the wave. For sound waves, this can cause a very loud noise, called a sonic boom.
Sonic booms produced by aircraft flying supersonic at altitudes of less than 100 feet, creating between 20 and 144 pounds overpressure, have been experienced by humans without injury. Damage to eardrums can be expected when overpres- sures reach 720 pounds
Explanation:
marke as brainliest
A 1kg blob of clay moving at 8 m/s collides inelastically with a 3 kg woode a. What is the initial momentum of the system? 6 kg m/s 9 kg m/s 8 kg m/s 4 kg m/s 4 s
The momentum of the blob of clay before collision which is the same as the initial momentum of the system is 8kgm/s.
Given the data in the question;
Mass of the blob of clay; [tex]m_b = 1 kg[/tex]Velocity of the blob of clay; [tex]v_b = 8m/s[/tex]Mass of wood; [tex]m_w = 3kg[/tex]Initial momentum of the system; [tex]P = \ ?[/tex]
MomentumMomentum is simply the product of the mass of an object and its velocity.
Its is expressed as;
[tex]P = m * v[/tex]
Where m is the mass of the object and v is its velocity.
To determine the initial momentum which is the momentum of the blob of clay before collision, we substitute our given values into the expression above.
[tex]P = m * v\\\\P = 1kg * 8m/s\\\\P = 8kg.m/s[/tex]
Therefore, the momentum of the blob of clay before collision which is the same as the initial momentum of the system is 8kgm/s.
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Find the velocity of the watch whose radius is 5 meter and time is 2 seconds
Question :-
Find the Velocity of the Watch whose Radius is 5 meter and Time is 2 seconds .Answer :-
Velocity of the Watch is 2.5 m/s .[tex] \rule {180pt} {2pt} [/tex]
Given :-
Radius = 5 meterTime = 2 seconds
To Find :-
Velocity = ?Solution :-
As per the provided information in the given question, we have been given that the Radius of the Watch is 5 meter , Time is given 2 seconds . And, we have been asked to calculate the Velocity of the Watch .
For calculating the Velocity , we will use Formula :-
Velocity = Displacement / TimeTherefore , by Substituting the given values in the above Formula :-
⇒ Velocity = Displacement / Time
⇒ Velocity = 5 / 2
⇒ Velocity = 2.5
Hence :-
Velocity = 2.5 m/s .[tex] \underline {\rule {180pt} {4pt}} [/tex]
⇒ Velocity = Displacement / Time
⇒ Velocity = 5 / 2
⇒ Velocity = 2.5
what is polygon of force
Answer:
a closed polygon whose sides taken in order represent in magnitude and direction a system of forces in equilibrium.
Explanation:
Answer: a closed polygon whose sides taken in order represent in magnitude and direction a system of forces in equilibrium.
Explanation: Hope that helps.
In a two-cell flashlight the batteries are normally connected in series. Why not connected them in a parallel.
Answer:
In series the battery voltage adds up but in parrel they don't which makes is usefull for a small device which uses multiple batteries.(if this is correct pls mark this brainly to let me know ty :)
A bird accelerating from rest at a constant rate , experiences a displacement of 28m in 11s .what is the final velocity after 11s?
Answer:
308m/s
Explanation:
Let the final velocity, displacent, time taken and initial velocity be V, S, T and U respectively.
Given,
U=0( The bird started from rest)
T= 11s
S=28m
then,
V=U+S×T
or, V=0+11×28
or, V= 308m/s
While traveling home at dusk, a motorcyclist gets on the highway and increases the combined mass (400 kg
for the motorcycle and 150 kg for the motorcyclist) from 30 mi/hr to 70 mi/hr in 3 seconds. While struggling to
clean his helmet later that evening, he wonders what would have been the acceleration of one of those bugs
striking his helmet if it had a mass of 5 g.
The acceleration of one of those bugs is equal to 305mi/s.
Acceleration calculation
To calculate the insect's acceleration, the action and reaction force of the impact must be considered.
As the insect will hit the helmet, the force it hits is the same force it receives, so we can make the following expression:
[tex]m_m \times a_m = m_b \times a_b[/tex]
[tex]550 \times 0.0027 = 5 \times 10^{-3} \times a_b[/tex]
Speed has been converted to miles per second
[tex]a_b = 305 mi/s[/tex]
So, the acceleration of one of those bugs is equal to 305mi/s.
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If a student weighs 100 pounds on Earth, how much more or less would she weigh on Pluto than Mars?
A. She would weigh 38 pounds less on Pluto
B. She would weigh 38 pounds more on Mars
C. She would weigh 31 pounds more on Mars
D. She would weigh 31 pounds less on Mars
Answer:
c because that's the answer
She would weigh 31 pounds more on Mars than on Pluto. Therefore option C is correct.
To calculate the differences in weight using the given information.
1. Weight on Earth: 100 pounds
Now, let's calculate the weight differences for Pluto and Mars:
2. Weight on Pluto:
Pluto's gravity is about 0.06 times that of Earth's.
Weight on Pluto = Weight on Earth × Pluto's gravity
Weight on Pluto = 100 pounds × 0.06 = 6 pounds
3. Weight on Mars:
Mars' gravity is about 0.38 times that of Earth's.
Weight on Mars = Weight on Earth × Mars' gravity
Weight on Mars = 100 pounds × 0.38 = 38 pounds
Comparing the weight differences:
Weight difference between Earth and Pluto = 100 pounds - 6 pounds = 94 pounds
Weight difference between Earth and Mars = 100 pounds - 38 pounds = 62 pounds
Therefore, the correct answer is C. She would weigh 31 pounds more on Mars than on Pluto.
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3. Which of the following are true of static electricity charges? *
+
A positively charged object has lost electrons.
A positively charged object has gained protons.
A positively charged object has gained electrons
Running with an initial velocity of +10.2 m/s m / s , a horse has an average acceleration of -1.77 m/s2 m / s 2 . How much time does it take for the horse to decrease its velocity to +6.1 m/s m / s ?
Using first equation of kinematics
[tex]\\ \rm{:}\dashrightarrow v=u+at[/tex]
[tex]\\ \rm{:}\dashrightarrow v-u=at[/tex]
[tex]\\ \rm{:}\dashrightarrow 6.1-10.2=-1.77t[/tex]
[tex]\\ \rm{:}\dashrightarrow -4.1=-1.77t[/tex]
[tex]\\ \rm{:}\dashrightarrow t=2.32s[/tex]
l
If iron filings were sprinkled evenly across the
entire paper circle, at which location would
the
grealest concentration of iron filings be found after
30 seconds?
Express 900 rev/hour (rpm) in rad/s
Answer:
900 Revolution/Minute (rev/min)
=
94.24778 Radian/Second (rad/s)
Explanation:
Which type of force can be used to kick a soccer ball?
Answer:
The answer is Friction.
Hope this helps :)
Please mark me brainliest :)
Answer:
I believe the answer is A. Contact
Explanation:
Hope that helps
Candace is interested in learning more about colors. Which question about colors could be answered through scientific investigation?
Which color bends the most to make a rainbow?
What color of scented marker has the best smell?
Which flower has the prettiest shade of purple on its petals?
What is the best-looking color on a high-performance sports car?
The question about colours that could be answered through scientific investigation is 'Which color bends the most to make a rainbow?'. That is option A.
What can cause color to bend?A beam of white light is made up of several colours which bends or refracts away as it strikes another medium or glass.
This bending of these colours can be visualised using prism experiments.
When this experiment is carried out, it would be observed that each color has a different wavelength, and it bends differently from all other colors.
Therefore, The question about colours that could be answered through scientific investigation is 'Which color bends the most to make a rainbow?'.
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The law of conservation of energy states that (1 point)
A. all energy in the universe comes from the sun and remains in the same form
B. energy is neither created nor destroyed; it is transformed and transferred
C. new energy within a system is converted or transferred and destroyed as it is used
D. energy is created from the sun and is transformed from one type to another
Answer:
energy is neither created nor destroyed; it is transformed and transferred
Explanation:
energy is neither created nor destroyed; it is transformed and transferred
After being accelerated to a speed of 1.17×105 m/s , the particle enters a uniform magnetic field of strength 0.800 T and travels in a circle of radius 35.0 cm (determined by observing where it hits the screen as shown in the figure). The results of this experiment allow one to find m/q .
Find the ratio m/q for this particle.
Express your answer numerically in kilograms per coulomb.
The ratio m/q for this particle is mathematically given as
m/q=2.39*10^{-6}
What is the ratio m/q for this particle?Question Parameters:
After being accelerated to a speed of 1.17×105 m/s
the uniform magnetic field of strength 0.800 T and travels in a circle of radius 35.0 cm
Generally, the equation for the Centrifugal force is mathematically given as
[tex]qvB=\frac{mv^2}{r}[/tex]
Therefore
m/q=(0.8*0.35)/(1.17*10^{5})
m/q=2.39*10^{-6}
In conclusion, the ratio m/q for this particle
m/q=2.39*10^{-6}
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Which choice is the best description of a well-defined, testable question for a science experiment?
The scientist has created questions for people to answer after they read about the science investigation.
The question is clearly stated, the question can be tested in an experiment, and the results can be measured.
The words are all defined in a glossary and a test can be given to see what students learned.
An experiment can be completed to help define the meaning of scientific words and phrases.
The best description of a well-designed testable question is "The question is clearly stated, the question can be tested in an experiment, and the results can be measured".
What is a scientific question?This type of question is the one that focuses on facts and aims at testing a hypothesis.
What are the features of a scientific question?Some features include:
The question is clear as it lets the reader know the phenomenon being studied.The question can be tested which means it is based on a phenomenon that can be studied through exact instruments.The results can be measured, which means the question leads to evidence.Learn more about science in: https://brainly.com/question/935949
Answer:
b
Explanation:
what is propagation
Nira here :)
Answer ASAP pls
[tex]\large{\underline{\underline{\pmb{\frak {\color {red}{Question:}}}}}}[/tex]
[tex] \sf \red{what \: is \: propagation}[/tex]
[tex]\large{\underline{\underline{\pmb{\frak {\color {blue}{Answer:}}}}}}[/tex]
Propagation is an asèxual method of reproduction. In propagation, the DNA from the parents is taken to form another organism.
[tex]\green\star[/tex]There are two types of propagation:
Vegetative propagation Artificial propagation.1. Vegetative propagation: In vegetative propagation, new plants are obtained from the parts of old plants (like stem, roots and leaves), without the help of any reproductive organs.
2. Artificial propagation: Human grow by some man made methods are called artificial propagation.
[tex] \boxed{ \frak \red{brainlysamurai}}[/tex]
Select the correct answer.
in which situation is no work being done?
А
a person carrying a box from one place to another
В.
a person picking up a box from the ground
C.
a person pushing a box from one place to another
D. a person pulling a box from one place to another
effect of earthquake Causes of earthquake and protection against earthquake. final conclusion
Causes of earthquake:
1 Groundwater extraction – decrease in pore pressure
2. Groundwater – increase in pore pressure.
3. Heavy rain.
4. Pore fluid flow.
5. High CO2 pressure.
6. Building dams.
Effects of earthquake:
1. Loss of lives
2. Increase in government expenditure
3. Loss of properties
Protection against earthquake:
We cannot prevent natural earthquakes from occurring but we can significantly mitigate their effects by identifying hazards, building safer structures, and providing education on earthquake safety. By preparing for natural earthquakes we can also reduce the risk from human induced earthquakes.
A solid steel ball is thrown directly downward, with an initial speed 7.30 m/s, from the top of a building at a height of 29.5 m. How much time in seconds does it take before the ground?
Answer:
1.82 seconds
Explanation:
see paper for full explanation :)
h=vi.t+1/2gt²
29.5 = 7.3t+1/2 x 9.8 x t²
4.9t²+7.3t-29.5=0
abc formula⇒ t = 1.82 s
An ice skater can change the rate of their spin by moving their arms into and away from their body without any other forces or torques. Explain this in terms of angular momentum.
Answer:
Angular momentum is conserved if there are no external forces
P1 = P2
I1 ω1 = I2 ω2
ω2 / ω1 = I1 / I2
If the skater pulls their arms in (I2 < I1) then the angular speed must increase for angular momentum to be conserved.
A 1,550 kg roller coaster cart is pulled at a constant speed of 2.3 m/s to the top of a 53.5 m tall ramp
that has a 30° incline. The coefficient of friction between the ramp and the roller coaster cart is
M = 0.075.
tow cable
53.5 m
Calculate the work done by friction on the roller coaster cart during its motion Jup the ramp.
Write your answer to three significant figures.
kJ
The work done by friction on the roller coaster cart during its motion up the ramp is -813 kJ
Conservation of energyThe total mechanical energy at the bottom of the tall ramp, E equals the total mechanical energy at the top of the tall ramp, E'
E = E'
U + K + W = U' + K' + W' where
U = initial potential energy of block = mgh , K = initial kinetic energy of block = 1/2mv², W = work done by friction at bottom of rampU = final potential energy of block = mgh', K' = final kinetic energy of block = 1/2mv'² and W' = work done by friction at top of rampSo,
mgh + 1/2mv² + W = mgh' + 1/2mv'² + W' where
m = mass of block = 1550 kg, g = acceleration due to gravity = 9.8 m/s², h = initial height of block = 0 m, v = initial velocity of block = 2.3 m/s, W = work done by friction at bottom of ramp = 0 J, h' = height of ramp = 53.5 m, v' = final velocity of block = 2.3 m/s = v (since it moves at constant speed), and W' = work done by friction at top of ramp. Work done by frictionSubstituting the values of h, W and v' into the equation, and making W' subject of the formula, we have
mgh + 1/2mv² + W = mgh' + 1/2mv'² + W'
mg(0) + 1/2mv² + 0 = mgh' + 1/2mv² + W'
0 + 1/2mv² + 0 = mgh' + 1/2mv² + W'
1/2mv² - 1/2mv² - mgh' = W'
W' = -mgh
Substituing the values of the variables into the equation, we have
W = -mgh
W = 1550 kg × 9.8 m/s² × 53.5 m
W = -812665 kgm²/s²
W = -812665 J
W = -812.665 kJ
W ≅ -813 kJ
So, the work done by friction on the roller coaster cart during its motion up the ramp is -813 kJ
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precaution taken to ensure accuracy
HELPPPPPP PLEASEEEEEEE-
Answer:
One piece has a north pole only, and the other piece has à soutn pole only.
Explanation:
mark me brainliest!!
Answer: B
Explanation:
When we split a magnet in half, both halves act as magnets, with each having a north and south pole. As with the original magnet, the matching north and south poles remain on the sides as in the original magnet. This means that the 2 broken sides must be polarized in the opposite direction.
Data
Table A
Record your data either in your lab notebook or in the tables below.
Cart Speed
Cart Speed
Elapsed Time
(s)
(Low fan speed) (Medium fan speed)
(cm/s)
(cm/s)
16.4
23
Cart Speed
(High fan speed)
(cm/s)
31.7
1
31.5
64.0
2
54
36
89.8
3
118.1
4
5
6
7
The speed will be calculated by dividing the distance traveled by the object by the time elapsed.
What is speed?Based on the information given, an overview will be given to you on how to calculate the speed of the cart.
Average speed is a scalar quantity and is gotten by dividing the distance by time taken. For example, if the distance traveled is 100km and the time taken is 4 hours. The speed will be:
= Distance/Time
= 100/4.
= 25km/h.
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what is angular momentum
Answer:
the quantity of rotation of a body, which is the product of its moment of inertia and its angular velocity.
angular momentum : The property of rotating object given by radius times linear momentum.
L = r x p
p = linear momentum
or
L = I x ω
I = inertia
ω = angular velocity
Determine the magnitude and direction of vector V2 such that V=2V1 + V2 acts along the positive z-axis having a magnitude of 20 from which vector V = 20i- 15j + 15k.
Answer:
Explanation:
V₁ = <20, -15, 15>, V = <0, 0, 20>
V₂ = V - 2V₁ = <0, 0, 20> - <40, -30, 30> = <-40, 30, -10> = -40i + 30j - 10k
magnitude = [tex]\sqrt{40^2+30^2+10^2}}=51[/tex]