Answer:
see explanation
Explanation:
sound travels faster in liquid than in gases because the molecules are packed closer together!
hope this helped! xoxo raina
Do you think the amount of positive charge on the glass after rubbing it with silk cloth will be equal to the amount of negative charge on the silk? explain.
What is the intensity of sound produced by an elephant's call if it has a power of 0.45 W and you are standing 32.5 m away from the lumbering beast
Answer:
I = 1.36 x 10⁻⁴ W/m²
Explanation:
The intensity of the sound produced by the Elephant can be calculated by using the following formula:
[tex]I = \frac{P}{A} \\\\[/tex]
where,
I = Intensity of sound = ?
P = power of sound = 0.45 W
A = area = πr² = π(32.5 m)² = 3318.3 m²
Therefore,
[tex]I = \frac{0.45\ W}{3318.3\ m^2} \\\\[/tex]
I = 1.36 x 10⁻⁴ W/m²
a bicycle process 1000 unit of momentum what would be the bicycles Momentum if its mass is tripled
The diagram below shows a periodic wave. Which two points on the wave are 180 degrees out of phase?
Please explain as well, thanks so much
Answer:
A and C are 180 deg out of phase (opposite points on a 360 deg wave)
The two points on the periodic wave which are 180 degrees out of phase are point A and Point C.
When two points of wave are out of phase?The two points of a wave is said to be out of phase when they show up or down motion at different times.
If a point on the wave, say (X) is reached to the maximum or minimum point before the other point. Then these two points are said to be out of phase.
Also, when the points are 180 degree apart from each other. Which means if a point is in the crest of the wave and other is on the through.
The diagram below shows a periodic wave. In this diagram,
A and I are the end points of the periodic wave.B,C,D,E,F and G are the other points on the periodic wave.Here, the point A and C are opposite point of each other. So they are 180 degrees out of phase.Hence, the two points on the periodic wave which are 180 degrees out of phase are point A and Point C.
Learn more about the periodic wave here;
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Help please please it's due today
Answer:
the right answer is option 2
A type of wave that carries energy from one place to another, even through
empty is : (fill in the blank) A-light, B-absorb , C- transmit , D- reflect
Answer:
light waves :)
Explanation:
How many snowmen do you think this sled can destroy? Explain your answer.
Answer:
342,690
Explanation:
I think, given 342,690 snowmen down a giant hill, that sled could destroy every single snowman :)
What information is represented by the slope of a graph of displacement versus time (displacement-time graph)?
is there a "real" simple machine that has an efficiency of 100%?
Answer:
NO
Explanation:
No, a machine cannot be 100% efficient. This is due to the movement of the moving parts siding against each other and causing friction. This friction is the one that creates heat and causes wear and tear between moving ports f the machine hence making the machine to decrease in efficiency with time
AYUDAAAAAAA Un ciclista de montaña se mueve cuesta abajo por la pendiente, si acelera a 3 m/s2 y se demora en bajar 15 minutos (900 segundos) ¿Qué distancia recorre? AYUDENME PORFAVOOOR
The question is: HELPAAAAAAA A mountain biker moves downhill if he accelerates at 3 m / s2 and takes 15 minutes (900 seconds) down, how far does he travel? HELP ME PLEASE
Answer: The distance travelled by the mountain biker is 2430 km.
Explanation:
Given: Acceleration = [tex]3 m/s^{2}[/tex]
Time = 15 minutes (900 sec)
Displacement = ?
Formula used to calculate the final velocity is as follows.
[tex]v = u + at[/tex]
where,
v = final velocity
u = initial velocity = 0 m/s (here)
t = time
a = acceleration
Substitute the values into above formula as follows.
[tex]v = u + a \times t\\v = 0 + 3 m/s^{2} \times 900 s\\= 2700 m/s[/tex]
The relation between velocity (speed) and distance is as follows.
[tex]Speed = \frac{Distance}{time}\\2700 m/s = \frac{Distance}{900 s}\\Distance = 2430000 m (1 m = 0.001)\\= 2430 km[/tex]
Thus, we can conclude that distance travelled by the mountain biker is 2430 km.
A skydiver uses a parachute to:
increase air resistance, which increases terminal velocity decrease air resistance, which decreases her mass
increase air resistance, which decreases terminal velocity increase air resistance, which decreases gravitational acceleration
increase air resistance, which decreases gravitational acceleration
how can a sound of a different note be produced in a guitar without changing the length of wire?
Answer:
how tightly strung the wire is
-- Make the string tighter or looser.
-- Keep the same length, but make the string thicker or thinner.
-- Touch the string at a point exactly 1/2, 1/3, 1/4, or 1/5 of its length from one end.
The bumper cars crash into each other and stop. Explain why both bumper cars stop after the crash. [4marks]
Answer:
The collision is inelastic
Explanation:
There are two kinds of collision; elastic collision and inelastic collision. In an elastic collision, both momentum and kinetic energy are conserved.
However, in an inelastic collision, kinetic energy is not conserved. So, when the bumper of two cars collide, the cars come to a stop because the collision is inelastic.
A box is being moved with a velocity v by a force p (parallel to v) along a level horizontal floor. The normal force is FN, the kinetic firictional force is fk, and the weight of the box is mg. Decide which forces do positive, zero, or megative work. Provide a reason for each of your answers
Two ropes support a load of 478 kg. The two ropes are perpendicular to each other, and the tension in the first rope is 2.2 times that of the second rope. Find the tension in the second rope. The acceleration of gravity is 9.8 m/s 2 . Answer in units of N.
Answer:
T₂ = 1937.68 N
Explanation:
First, we will calculate the weight of the object:
[tex]W = mg = (478\ kg)(9.81\ m/s^2)\\W = 4689.18\ N[/tex]
Now, we will calculate the resultant tension in the ropes. Since the ropes are perpendicular. Therefore,
[tex]T = \sqrt{T_1^2+T_2^2}\\[/tex]
where,
T = Resultant Tension
T₁ = Tension in rope 1
T₂ = Tension in rope 2
According to the given condition tension in the first rope is 2.2 times the tension in the second rope:
T₁ = 2.2 T₂
Therefore
[tex]T = \sqrt{(2.2T_2)^2 + T_2^2}\\\\T = 2.42T_2[/tex]
Now, the weight of the object must be equal to the resultant tension for equilibrium:
[tex]T = W\\2.42T_2 = 4689.18\ N\\\\[/tex]
T₂ = 1937.68 N
c) Explain the following.
Keftles, cooking pans and iron boxes have polished surfaces
Answer:
Polished surfaces reduce heat loss
As an electric current flows through the copper sulfate solution, copper settles on the negative electrode. How will the mass of the copper covering this electrode change if we increase the current by 4 times and halve its flow time?
Answer:
Ține ogaru ca să o lingă pe măta în cur să nu mai facă alt prost ca tine
Two resistors, R 1 and R 2 , are connected in parallel. R 2 =221.0 ohms, and the equivalent resistance of the combination is 120.7 ohms. What is the value of R 1 ? (Unit = ohm)
Answer:
Explanation:
When resistors are connected in parallel combination, then equivalent resistance is given by,
[tex] \to \quad \bf{ \dfrac{1}{R_1} + \dfrac{1}{R_2} =\dfrac{1}{R_p}}[/tex]
Inserting values,
[tex] \to \quad \bf { \dfrac{1}{R_1} + \dfrac{1}{R_2} =\dfrac{1}{R_p} } \\ \\ \to \quad \bf { \dfrac{1}{R_1} + \dfrac{1}{221} =\dfrac{1}{120.7} } \\ \\ \to \quad \bf { \dfrac{221+R_1}{(R_1)(221)} =\dfrac{1}{120.7} } \\ \\ \to \quad \bf { \dfrac{221+R_1}{221R_1} =\dfrac{1}{120.7} } \\ \\ \to \quad \bf { 120.7(221+R_1) = 221R_1(1)} \\ \\ \to \quad \bf { 26674.7 + 120.7R_1= 221R_1} \\ \\ \to \quad \bf { 26674.7= 221R_1- 120.7R_1} \\ \\ \to \quad \bf { 26674.7 = 100.3R_1} \\ \\ \to \quad \bf { \dfrac{26674.7 }{100.3} =R_1} \\ \\ \to \quad\underline{\boxed{ \bf { 265.9 \; \Omega=R_1}}} \\ [/tex]
Un diapasón vibra a 140 [Hz] y la onda emitida por él se propaga con una rapidez de 340 m/s.Considerando lo anterior, se puede afirmar correctamente que la longitud de onda de la onda emitida por el diapasón es
The question is: A tuning fork vibrates at 140 [Hz] and the wave emitted by it propagates with a speed of 340 m / s. Considering the above, it can be correctly stated that the wavelength of the wave emitted by the tuning fork is
Answer: Wavelength of the wave emitted by the tuning fork is 2.43 m.
Explanation:
Given: Frequency = 140 Hz
Speed = 340 m/s
wavelength = ?
Formula used to calculate the wavelength is as follows.
[tex]\lambda = \frac{v}{f}[/tex]
where,
[tex]\lambda[/tex] = wavelength
v = speed
f = frequency
Substitute the values into above formula.
[tex]\lambda = \frac{v}{f}\\= \frac{340 m/s}{140 Hz} (1 Hz = 1 s^{-1})\\= 2.43 m[/tex]
Thus, we can conclude that wavelength of the wave emitted by the tuning fork is 2.43 m.
What is the difference between the spectrum of an incandescent solid and the spectrum of an incandescent gas?
Incandescent solids emit bright-line spectra; incandescent gases emit continuous spectra.
Incandescent solids emit one wavelength; incandescent gases emit several wavelengths.
Incandescent solids emit continuous spectra; incandescent gases emit bright-line spectra.
Incandescent solids emit scattered spectra; incandescent gases emit continuous spectra.
Answer:
ncandescent solids emit continuous spectra; incandescent gases emit bright-line spectra.
Explanation:
Materials when heated emit a continuous spectrum with all wavelengths.
Hot gas gases emit a spectrum that depends on the transitions between atomic states, therefore it is a discrete spectrum.
When reviewing the answers, the correct one is:
ncandescent solids emit continuous spectra; incandescent gases emit bright-line spectra.
Lithium has an atomic number of 3. How many electrons does it have?
A 4
B. 1
C. 2
D. 3
Answer:
it has 3 electrons. brainliest please
A fairground ride consists of a large vertical drum that spins so
fast that everyone inside it stays pinned against the wall when
the floor drops away. The diameter of the drum is 10 m. Assume
that the coefficient of static friction between the drum and the
rider’s clothes are 0.15.
a) What is the minimum speed required for the riders so that
they stay pinned against the inside of the drum when the
the floor drops away?
Answer:
v = 3.84 m/s
Explanation:
In order for the riders to stay pinned against the inside of the drum the frictional force on them must be equal to the centripetal force:
[tex]Centripetal\ Force = Frictional\ Force\\\\\frac{mv^2}{r} = \mu R = \mu W\\\\\frac{mv^2}{r} = \mu mg\\\\\frac{v^2}{r} = \mu g\\\\v = \sqrt{\mu gr}[/tex]
where,
v = minimum speed = ?
g = acceleration due to gravity = 9.81 m/s²
r = radius = 10 m
μ = coefficient of friction = 0.15
Therefore,
[tex]v=\sqrt{(0.15)(9.81\ m/s^2)(10\ m)}[/tex]
v = 3.84 m/s
1. You and your forensics team are working a crime scene of a 19 year-old female who was found in the woods behind
the local hospital. She is found lying on her torso (face down), but lividity is present on the dorsal (back) side of the
victim.
What can you conclude about the victim/situation?
Answer:
You could conclude the 2nd fact
Explanation:
The conclusion will be that she died before 4-5 hours and she has been poisoned.
What will be the conclusion?It is found that the 19 years old female was found in the woods and she finds lying her face down and also the lividity is present on the backside of the woman.
First of all, we will understand what is lividity. Lividity is the process in which the color of the body changes and it starts after 1-4 hours of death.
lividity occurs when the blood does not pump the blood in the body and the blood is collected to the particular area where the gravity is acting.
If the body is found face down with signs of blanching on its back, it suggests to forensic scientists that the individual had likely died on their back and been moved.
If the body color changes to red cherry then it can be predicted that the individual died from carbon mono oxide poisoning
If the body color changes to pink it can be due to cyanide poisoning.
Thus the conclusion will be that she died before 4-5 hours and she has been poisoned.
To know more about lividity follow
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what do you think "you see the world the way you feel" means
A regular incandescent bulb is 7% efficient. Which of the following statements best explains this statement?
A.
For every 100 units of electrical energy that enter a light bulb, 7 units are changed into light energy.
B. Every hour that a light bulb is on it uses 7 kW of electric energy.
C. 7 % of the electrical energy that reaches a light bulb is wasted as heat.
D. 7 % of the electrical energy that reaches a light bulb goes right through without being used.
Answer:
Fossil fuels store energy from the sun as
will and elephant fall faster than a mouse and why
Answer:
elephant fall faster then a mouse because of the air resistance.
hope it helps.
Explanation:
elephant fall faster than a mouse and because of the air resistance .
hope it is helpful to you
1- Three 6-ohms resistors in a series circuit give equivalent resistance of
Answer:
The equivalent resistance of the three resistors is 18 ohms.
Explanation:
The value of three resistors are 6 ohms.
We need to find the equivalent resistance of the resistors. In series combination, the equivalent resistance is given by :
R = R₁ + R₂ + R₃ +.....
Put all the values,
R = 6+6+6
R = 18 ohms
Hence, the equivalent resistance of the three resistors is 18 ohms.
What is the frequency of a wave with a speed of 45 m/s and
a wavelength of 2.5 m?
Answer:
f=s/w
f=45/2.5=18
s means speed which is in m/s while w is wavelength which is Lamda
Please help ..........................
Answer:
it's 10 you can see it goes by 2 and the others fo by 1 pretty simple
I need help , Please help .
Answer: Instead, A increases slightly with temperature as the increased kinetic energy of molecules at higher temperatures causes them to move slightly faster and thus undergo more collisions per unit time.
*Edited*