Answer:
tốt ý bạn là gì?
Explanation:
3. Automobile companies often test the safety of cars by putting them through crash tests to observe the integrity of the passenger compartment. If 1100kg car is sent toward a cement wall with a speed of15 m/s, an impact force of 185,000 N stops the car, how long does it take before the car is brought to a stop?
Answer:
Time taken for car to stop = 0.89 seconds (Approx.)
Explanation:
Given:
Mass of car = 1100 kg
Speed of car = 15 m/s
Impact force = 185,000 N
Find:
Time taken for car to stop
Computation:
Change in momentum of car = M(v) - M(u)
Change in momentum of car = 1100(0) - 1100(15)
Change in momentum of car = -16,500
Time taken for car to stop = I Change in momentum of car I / Impact force
Time taken for car to stop = I-16,500I / 185,000
Time taken for car to stop = 0.89 seconds (Approx.)
The time it takes for the car to stop will be 0.89 sec. Due to the external resistive force, the car will stop after some time.
What is momentum?The momentum is defined as the product of mass and the velocity of the body. It is denoted by the letter P. It occurs due to the applied force. Its unit is Kg m/s².
The change in the momentum of the car is given as;
[tex]\rm \triangle P = m(V-U) \\\\ \triangle P = 1100(0-5) \\\\ \rm \triangle P =-16,500 Kgm/s[/tex]
The time taken for a car to stop will be;
[tex]I \triangle p= F\triangle t \\\\ \rm t = \frac{\triangle p }{F} \\\\ \rm t = \frac{|-16500|}{18500} \\\\ \rm t =0.89 \ sec[/tex]
Hence the time it takes for the car to stop is 0.89 sec.
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If the charge q is placed at the centre of the line joining two equal charges Q such that the system is in equilibrium then the value of q is? <br /><br />Really need it, with a good explanation, will appreciate such answer.
Let's just suppose this situation, so it's like this;
Q --------------- q --------------- Q
Now, acc. to the question, the system is equilibrium which means that possibly both the Q should be exerting some pressure on the middle charge q, so let's suppose Q be +ve and q be -ve
The charge that we have kept at a certain distance something like this;
+Q --------------- -q --------------- +Q
<––– d ––– > <––– d ––– >
Now, we +Q will be exerting some force on the another +Q that it should be acc. to columbs law like this;
F = k × Q1Q2/r²
F = k × QQ/(2d)²
F1 = k × Q²/4d²
Also, when this +Q will exert force on -q, it could be written as;
F = k × Q1Q2/r²
F2 = k × Qq/d²
From the question, we know that the system is a equilibrium which means that these two force F1 and F2 will be equal to each other;
= k × Q²/4d² = k × Qq/d²
Eliminate the common values= Q/4 = q
Wait wait! The answer had still not came! remember this q is actually -q?= Q/4 = -q
= -Q/4 = q
So, the charge on q is -Q/4.
-------------------------------------------
Have already answered this question, but still!
[A] Write an expression for the equivalent resistance of three resistors connected in parallel.[ no derivation needed]
[B] In the circuit diagram given along-side, find:
[i] Total resistance of the circuit.
[ii] Total current flowing in the circuit.
[iii] The potential difference across R1
Answer:
1) R1 + ((R2 × R3)/(R2 + R3))
2) 0.5 A
3) 3.6 V
Explanation:
1) We can see that resistors R2 and R3 are in parallel.
Formula for sum of parallel resistors; 1/Rt = 1/R2 + 1/R3
Making Rt the subject gives;
Rt = (R2 × R3)/(R2 + R3)
Now, Resistor R1 is in series with this sum of R2 and R3. Thus;
Total resistance of circuit = R1 + ((R2 × R3)/(R2 + R3))
2) R_total = R1 + ((R2 × R3)/(R2 + R3))
We are given;
R1 = 7.2 Ω
R2 = 8 Ω
R3 = 12 Ω
R_total = 7.2 + ((8 × 12)/(8 + 12))
R_total = 7.2 + 4.8
R_total = 12 Ω
Formula for current is;
I = V/R
I = 6/12
I = 0.5 A
3) since current through the circuit is 0.5 and R1 is 7.2 Ω.
Thus, potential difference through R1 is;
V = IR = 0.5 × 7.2 = 3.6 V
The school band is practicing their scales. As the pitch and frequency of the notes increases, what happens to the wavelength of the notes?
○ The wavelength increases.
○ The wavelength decreases then increases.
○ The wavelength stays the same.
○ The wavelength decreases.
Answer:B
Explanation:
Answer:
LETTER BTHE WAVELENGTH DECREASES THEN INCREASESExplanation:
PLEASE MARK ME AS BRAINLIEST AND FOLLOW MEWhat is the capacitance of a capacitor that has 7.9 x 107 C of charge and a potential
difference of 12.0 V?
Answer:
6.58×10⁶ F
Explanation:
Applying,
Q = CV..................... Equation 1
Where Q = charge of the capacitor, C = Capacitance of the capacitor, V = Volatage
Make C the subject of the equation
C = Q/V................. Equation 2
From the question,
Given: Q = 7.9×10⁷ C, V = 12.0 V
Susbtitute these values into equation 2
C = 7.9×10⁷/12
C = 6.58×10⁶ F
the weight of the buggy was 105N on earth And 40N on mars. Why was the weight of the buggy less on mars than earth?
Answer: The gravity on Mars is considerably less than it is on Earth, so while the buggy still has the same physical mass, its relative weigh it considerably less.
HELP ASAP Miguel claims that as a ball falls, it loses potential energy. Izzy claims that as a ball falls, it
gains kinetic energy. Can both students be correct? Describe the evidence which would support
either student.
Answer and Explanation:
They are both correct.
This is because potential energy is when there is potential for the object to have energy, while kinetic energy is energy that is moving already.
So, as the ball falls, it loses its potential energy, or "still/Stalled" energy, and gains kinetic energy, or moving energy.
#teamtrees #PAW (Plant And Water)
How much would an 80.0kg person weigh on Mars, where the acceleration of gravity is 3.93m/s and in Earths moon, where the acceleration of gravity is 1.63m/s
Answer:
this is the answer
Explanation:
This is the solution, hope it helps
While driving on Fairway Drive, you see a pedestrian in the crosswalk, so you step on the brakes. If you decelerate at a rate of -2.4m/s2 and you were originally driving at a rate of 24 miles per hour (*hint convert to m/s), how long would it take you to come to a full stop. Please give your answer in seconds.
In what way is consciousness a construct?
Answer:
Consciousness is a psychological construct because it is believed to exist, but we are unable to physically measure it, so descriptions are 'constructed' to explain it. ... The more aware we are of our thoughts, feelings, perceptions and surroundings, the higher the level of consciousness.
The universe could be considered an isolated system because
many people think that no energy or matter exists outside the universe
energy and matter are created in the universe and flow freely into and out of the universe
energy is created outside the universe and matter is created within the universe
energy is created in the universe and matter is transferred out of the universe
Answer:
A(many people think that no energy or matter exists outside the universe)
Explanation:
How many electrons are contained in 1.0 C of charge? What is the mass of the electron in 1.0C of charge?
There are approximately 6.24 x 10¹⁸ electrons contained in 1.0 C of charge. The mass of the electron in 1.0 C of charge remains the same as the mass of an electron, which is approximately 9.109 x 10⁻³¹ kg.
We may utilise the elementary charge, which represents the charge of a single electron, to calculate how many electrons are present in 1.0 C of charge. It is estimated that the elementary charge is 1.602 x 10-19 C.
Number of electrons = Charge ÷ Elementary charge
Number of electrons = 1.0 C ÷ (1.602 x 10⁻¹⁹ C)
Calculating the division:
Number of electrons ≈ 6.24 x 10¹⁸ electrons
Therefore, there are approximately 6.24 x 10¹⁸ electrons contained in 1.0 C of charge.
It is crucial to remember that the electron's mass is unaffected by the charge when considering the electron's mass in 1.0 C of charge. Regardless of the charge it carries, an electron has a mass of about 9.109 x 10⁻³¹ kg.
Thus, the mass of one electron, which is roughly 9.109 x 10⁻³¹ kg, remains constant in 1.0 C of charge.
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What does Positive electrons mean
Answer:
Protons and Electrons
For every proton in an atomic center, somewhere, in an orbital, there will be an electron. A proton carries a positive charge (+) and an electron carries a negative charge (-), so the atoms of elements are neutral, all the positive charges canceling out all the negative charges.
Explanation:
thank me later
In space, are fires possible without oxygen? If so how would it happen?
Answer:
no
Explanation:
it just doesn't work that way, try to search the fire pyramid on G. O. O. G. L. E. and you'll see why
Why is the horizontal velocity of a
projectile constant?
Answer:
Explanation:
I'll try to answer this is clearly as possible without talking in circles. If an object is launched into projectile motion, something was behind it, pushing it forward. Once this launching was done, the launching mechanism was no longer important to the object and the object is free to keep moving forward at that same velocity forever...if that was the only thing at play here. But, because of air resistance and GRAVITY, the object is pulled down and eventually hits the ground. In other words, if there was no such thing as gravity, an object would continue to move forever in the diretion and at the speed at which it was launched.
A student jumps from a flat surface with an initial velocity of 15ms. If the distance covered is 3m. What is the acceleration due to gravity and the time?
Answer:
the acceleration due to gravity, g is zero (0)
the time of the motion is 0.2 s
Explanation:
Given;
initial velocity of the student, u = 15 m/s
distance traveled by the student, x = 3 m
The motion of the student is directed towards the horizontal and the acceleration due to gravity, g is zero (0).
The time of the motion is calculated as;
x = ut + ¹/₂gt²
x = ut + ¹/₂(0)t²
x = ut
t = x/u
t = 3 / 15
t = 0.2 s
Therefore, the time of the motion is 0.2 s
Use trigonometry to find the missing values of the sides of the triangles below.
Explanation:
tan ● = opposite / adjacent
tan 31.5 = 19 / F
0.613 = 19 / F
0.613F = 19
F = 31
sin ● = opposite / hypotenuse
sin 31.5 = 19 / a
0.52 = 19 / a
0.52a = 19
a = 36. 36
Using trigonometry, the base of the triangle is approximately 33.476, and the hypotenuse of the triangle is approximately 38.118.
To find the base and hypotenuse of a right triangle with one angle of 31.5 degrees and a given height of 19:
Here,
Opposite side = height = 19 (given)
Adjacent side = base (unknown)
Hypotenuse = hypotenuse (unknown)
First, let's find the base (adjacent side):
tan(θ) = opposite ÷ adjacent
tan(31.5 degrees) = 19/base
To find the base, we can rearrange the equation:
base = opposite ÷ tan(θ)
base = 19 ÷ tan(31.5 degrees)
Calculating the value:
base ≈ 33.476
So, the base of the triangle is approximately 33.476.
Now, using the Pythagorean theorem, we can write:
hypotenuse² = base² + opposite²
hypotenuse² = (33.476)² + 19²
hypotenuse ≈ 38.118
Therefore, the hypotenuse of the triangle is approximately 38.118.
Thus, base is 33.476, and hypotenuse is 38.118.
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When was Volleyball originated?
Answer:
Volleyball was invented in 1895 by William G. Morgan, physical director of the Young Men's Christian Association (YMCA) in Holyoke, Massachusetts.
Which term describes an area of low density in a longitudinal wave?
A. Crest
B. Compression
C. Rarefaction
D. Trough
Answer: rarefaction
Explanation: correct answer on a p e x
Rarefaction term describes an area of low density in a longitudinal wave.
What is wave ?Wave is a disturbance in a medium that carries energy as well as momentum . wave is characterized by amplitude, wavelength and phase. Amplitude is the greatest distance that the particles are vibrating. especially a sound or radio wave, moves up and down. Amplitude is a measure of loudness of a sound wave. More amplitude means more loud is the sound wave.
Wavelength is the distance between two points on the wave which are in same phase. Phase is the position of a wave at a point at time t on a waveform.
There are two types of the wave longitudinal wave and transverse wave. Longitudinal wave : in which, vibration of the medium (particle) is parallel to propagation of the wave. Sound wave is a longitudinal wave. Transverse wave : in which, vibration of the medium (particle) is perpendicular to propagation of the wave. Light wave is a transverse in nature wave.
In Longitudinal wave, wave carries energy and momentum with compression and rarefaction. Compression is region of high density, in this region particles of the medium is compressed. rarefaction is region of expansion and it is low density region of longitudinal wave.
Hence option C is correct.
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Please help!!
What happens to the apparent wavelength in the doppler effect example as the wave source moves forward, towards you?
Answer:
The waves travel at the same speed, but the observed frequency depends on any relative motion between the observer and source. When the observed frequency changes, so does the wavelength. If the observer and source are moving toward each other, then the frequency increases and the wavelength decreases
Explanation:
Hope it helps.
How might the rate of conduction be affected if the fiber absorbs moisture ?
Answer:
Moisture absorbed by fabric material in a humidity environment or liquid water ... Perspired moisture penetrating into the hydrophobic fiber can increase ... Moisture content within the porous insulating materials greatly affect thermal ... When the ambient humidity increase or decrease
Explanation:
Can somebody help I'll give brainliest
Sorry my answer was wrong :P
[tex]what \: is \: amplitude \: {?} [/tex]
Answer:
The amplitude is a measure of its change in a single period (such as time or spatial period)
what is amplitude?
Answer:A periodic variable's amplitude is a measure of its change across a single period, such as time or space. Amplitude is defined in a variety of ways, but they're all based on the size of the disparities between the variable's extreme values. The amplitude of a periodic function is sometimes referred to as the phase in older writings texts.
-------------------------hope it helps...have a great day!!What is the time required for sound to travel 1.75 km if the temp of the air is 20 C°?
Answer:
Explanation:
The 2 equations we need for this are
[tex]v=331.5+.606T[/tex] and
d = rt. First we need to find the velocity using the first equation, then we will plug it into the distance equation as the rate to find the time.
v = 331.5 + .606(20.0) I used 3 sig figs for the temp instead of the 1 found in 20.
v = 331.5 + 12.1 so
v = 343.6 m/s
Now, before we can find the time in seconds, we need to convert the distance to meters.
1.75 km = 1750 m:
1750 = 343.6t so
t = 5.09 seconds
The current illustrated in the diagram is directed upward in a straight vertical wire. A compass is placed alongside the wire at the X mark. Which way will the compass point?
- north
- south
- west
- east
The right answer is South. But why? Thank you.
Answer: South
Explanation:
According to the right-hand thumb rule, if the thumb's direction indicates the current, then the wrapping of fingers gives the direction of the magnetic field.
In the given case, magnetic field lines around the wire are in the form of concentric circles. If the compass is placed at x, then the direction of the magnetic field line will be tangential to the concentric circles, which will point toward the south.
Please help I’ll give brainliest
State the difference between viscosity and friction
Answer:
The main difference between friction and viscosity is that friction is used to refer to forces that resist relative motion, in general, whereas viscosity refers specifically to resistive forces that occur between layers of a fluid when fluids attempt to flow.
Explanation:
Answer:
Viscosity
Viscosity is defined as a measure of the resistance of a fluid, which is being deformed by either shear stress or tensile stress. In more common words, viscosity is the “internal friction” of a fluid. It’s also referred as the thickness of a fluid. Viscosity is simply the friction between two layers of a fluid when the two layers move relative to each other. Sir Isaac Newton was a pioneer in fluid mechanics. He postulated that, for a Newtonian fluid, the shear stress between layers is proportional to the velocity gradient in the direction perpendicular to the layers. The proportional constant (proportionality factor) used here is the viscosity of the fluid. The viscosity is usually denoted by the Greek letter “µ”. Viscosity of a fluid can be measured using Viscometers and Rheometers. The units of viscosity are Pascal-seconds (or Nm-2s). The cgs system uses the unit “poise”, named after Jean Louis Marie Poiseuille, to measure viscosity. Viscosity of a fluid can also be measured by several experiments. The viscosity of a fluid depends on the temperature. The viscosity decreases as the temperature is increased.
τ = μ (∂u / ∂y)
Viscosity equations and models are very complex for non-Newtonian fluids. It can be clearly seen that viscosity always acts in a direction, to oppose the flow of the liquid. Viscous forces are distributed throughout the volume of the liquid in a given dynamic condition.
Friction
Friction is probably the most common resistive force we experience every day. Friction is caused by the contact of two rough surfaces. Friction has five modes; dry friction that occurs between two solid bodies, fluid friction, which is also known as viscosity, lubricated friction, where two solids are separated by a liquid layer, skin friction, which opposes a moving solid in a liquid, and internal friction that causes the internal components of a solid to make friction. However, the term “friction” is most commonly used in place of dry friction. This is caused by the rough microscopic cavities on each of the surfaces fitting each other and refusing to move. The dry friction between two surfaces depends on the friction coefficient and the reactive force normal to the plane acting on the object. The maximum static friction between two surfaces is just a bit higher than the dynamic friction.
Explanation:
PLS MARK ME BRAINLIEST
An electron in a hydrogen atom drops from the n= 3
energy level to the n=2 energy level. The energy of
the emitted photon is
A) 1.89 eV
C) 1.51 eV
B) 3.40 eV
D) 4.91 eV
Answer: D) 4.91 eV
Explanation:
الإجابة الصحيحة هي
كرة كتلتها g 200 مربوطة بنهاية خيط طوله m 1 تتحرك حركة دائرية منتظمة في مسار دائري افقي ، اذا كانت الكرة تدور دورتين في الثانية ، فإن مقدار قوة الشد في الخيط بوحدة النيوتن تقريبا
تساوي :
ا
اعتبر النسبة التقريبية تساوي 3.14
Answer:
what do you mean?
Explanation:
Answer:
un arabe
Explanation:
A child with a mass of 23 kg rides a bike with a mass of 5.5 kg at a velocity of 4.5 m/s to the south. Compare the momentum of the child with the momentum of the bike
Answer:
Explanation:
Given the following data;
Mass of child = 23 kg
Mass of bike = 5.5 kg
Velocity = 4.5 m/s
Momentum can be defined as the multiplication (product) of the mass possessed by an object and its velocity. Momentum is considered to be a vector quantity because it has both magnitude and direction.
Mathematically, momentum is given by the formula;
[tex] Momentum = mass * velocity [/tex]
To find the momentum of each of them;
I. Momentum of the child
Momentum C = mass * velocity
Momentum C = 23 * 4.5
Momentum C = 103.5 Kgm/s
II. Momentum of the bike
Momentum B = mass * velocity
Momentum B = 5.5 * 4.5
Momentum B = 24.75 Kgm/s
Hence, we can deduce from the calculations that the momentum of the child is greater than that of the bike because of the higher mass possessed by the child.