Answer:
See down
Explanation:
Airborne Testing
In order to rate the airborne sound insulation of a party element, speakers are used to generate white noise, usually at levels of around 100 decibels, in the source room. Then, using a moving microphone technique, the average sound pressure level is measured the other side of the element in question.
you have two positively charged spheres. one sphere has 3 times the charge of the other sphere if they are 0.16m apart and the force between them is 0.28 N, what are the charges of the two spheres?
this is the answer
pls give brainliest
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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A crate is released from the highest point of a 12 m long ramp inclined at 60° with the horizontal. The motion is frictionless. What is the speed of the crate at the base of the ramp?
law of conservation of mechanical energy
PE1 = Ek2
mgh=1/2mv²
h = 12 sin 60
[tex]\tt v=\sqrt{2gh}=\sqrt{2\times 9.8\times 12\times sin~60}=14.27~m/s[/tex]
When studying energy, the main units to consider are the calories. However, many times the needed numbers are not readily available. Often, conversions need to be done in order to calculate the correct values. Knowledge of the metric system is essential to do this successfully.
If a female lion runs a distance of 469.2 meters while chasing an antelope, how many millimeters did she run?
A.
0.0004692 mm
B.
0.4692 mm
C.
46,920 mm
D.
469,200 mm
Answer:
B. O.4692 mm
Explanation:
I hope its help keep safe
Answer:
Its D trust me it is
Explanation:
In Figure 10.13, the author illustrates a book being raised at constant speed. Which of the following statements are true? Select all that apply.
There is no change in the kinetic energy of the book.
The potential energy of the book-Earth system decreases.
The potential energy of the book-Earth system increases.
The potential energy of the book increases.
Answer:
There is no change in the kinetic energy of the book and the potential energy of the book-Earth system increases.
Explanation:
This is because velocity is constantly increasing. This supports the idea that the kinetic energy of the book doesn't change and that the potential energy of the book-Earth system increases.
The true statement is that ;there is no change in the kinetic energy of the book and the potential energy of the book-Earth system increases.
We have to note that from the law of conservation of mechanical energy, the sum of the kinetic and potential energy of the book at any point remains constant.
If the book is being raised at constant speed, the the true statement is that ;there is no change in the kinetic energy of the book and the potential energy of the book-Earth system increases.
Learn more about kinetic energy: https://brainly.com/question/15308590
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:
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
a An electron is placed in a uniform electric field with field strength of 150lavono calculate the duration fort to travel somm from its stationary position. Give an Explanation for your Answer.
Explanation:
Explanation for your Answer.
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
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
A ball with a volume of 3 cm3 and a density of 9.0 g/cm3 increases its velocity from 2 m/s to 6 m/s over a 12
second period of time. What force was applied to get it moving?
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
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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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.
The figure is a cross section through three long wires with linear mass density 55.0 g/m. They each carry equal currents in the directions shown. The lower two wires are 4.0 cm apart and are attached to a table. (Figure 1)
The current that will allow the upper wire to float so as to form an equilateral triangle with the lower wires is 328.3 A.
Net force at the center of the equilateral triangleThe current that will allow the upper to float will form zero resultant force due to the current at the left and the current at the right.
Weight effect of the wires acting downwardsW = mg
W = (σL)g
Resultant electric force of the two upward wires[tex]F_1 = F_2 = \frac{\mu_o I^2 l}{2\pi r}[/tex]
The total force due to angle formed by the top wire
[tex]F_t = F_1cos\theta + F_2 cos \theta= 2Fcos\theta = \frac{2\mu_o I^2 l \times cos\theta}{2\pi r} \\\\F_t = \frac{\mu_o I^2 l \times cos\theta}{\pi r}[/tex]
At equilibrium the upward force must equal downward force
[tex]\sigma lg=\frac{\mu_o I^2 l \times cos\theta}{\pi r}\\\\I^2 = \frac{\sigma lg \pi r}{\mu_0 l \times cos\theta} = \frac{\sigma g \pi r}{\mu_0 \times cos\theta} \\\\I^2 = \frac{(0.055)\times 9.8\pi \times 0.04 }{4\pi \times 10^{-7} \times cos60} \\\\I^2 = 107,800\\\\I = \sqrt{ 107,800} \\\\I = 328.3 \ A[/tex]
Thus, the current that will allow the upper wire to float so as to form an equilateral triangle with the lower wires is 328.3 A.
Complete question is below:
The figure is a cross section through three long wires with linear mass density 55.0 g/m. They each carry equal currents in the directions shown. The lower two wires are 4.0 cm apart and are attached to a table. (Figure 1). What current I will allow the upper wire to "float" so as to form an equilateral triangle with the lower wires?
Learn more about magnetic force here: https://brainly.com/question/13277365
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 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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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
Please answer this question. Thank you and have a fruitful day.
Answer:
top box: upthrust
right box: water resistance
bottom box:gravity / weight
left box: thrust
Explanation:
You too have a fruitful day! Hope I could help!
#Down
The weight of the ship is pulling downwards#Up
Upthrust or buyoant force of water#Left
The force of motor
#Right
Drag force of airWhat 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
Energy cannot be changed from one variety to another.
True or False
Answer:
False, Hope this helps.
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]
Forest protect the soil from erosion ? True or False
Answer:
TrueForests helps in binding the soil together. Thus, prevent soil from erosion.
Answer:
True
Explanation:
Forest protect the soil from erosion because the trees in the forest hold the soil together not allowing it to erode.
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
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
An object, initially at rest, accelerates uniformly with an acceleration of 6 m/s². What is the displacement of the object after 10 s?
a. 300m
b. -300m
c. 600 m
d. -600m
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
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 :)
Express 900 rev/hour (rpm) in rad/s
Answer:
900 Revolution/Minute (rev/min)
=
94.24778 Radian/Second (rad/s)
Explanation:
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
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.