Answer:
77
Explanation:
two streams merge to form a river. one stream has a width of 8.2 m, depth of 3.4 m, and current speed of 2.3 m/s. the other stream is 6.8 m wide and 3.2 m deep, and flows at 2.6 m/s. if the river has width 10.5 m and speed 2.9 m/s, what is its depth?
The depth of the river is calculated to be 3.7 m
Given,
Width of stream 1 = 8.2 m
Depth = 3.4 m
Current speed = 2.3 m/s
Width of second stream = 6.8 m
Depth = 3.2 m
Current speed = 2.6 m/s
Width of the river = 10.5 m
Current of river 3 = 2.9 m/s
For stream 1
h₁ = 3.4 m ,b₁= 8.2 m ,v₁= 2.3 m/s
For stream 2
h₂ = 3.2m ,b₂= 6.8 m , v₂=2.6 m/s
For river 3
b= 10.5 m ,v= 2.9 m/s
Lets take depth of the river = h
Total discharge should be constant.
We know that discharge
Q= A v
A=Area ,v=velocity
Q₁+Q₂ = Q
By putting the values
h₁b₁v₁ + h₂ b₂ v₂ = b h v
3.4 x 8.2 x 2.3 + 3.2 x 6.8 x 2.6 = 10.5 x 2.9 x h
h= 3.78 m
Therefore, the depth of the river is 3.78 m
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laser beams are sometimes used to burn away cancerous tissue.show answer no attempt what is the intensity, in watts per square meter, of a laser beam that is 90.0% absorbed by a 1.8-mm diameter spot of cancerous tissue and must deposit 525 j of energy to it in a time period of 4.25 s?
The intensity of the beam is 1.21*10^7 W/m^2 and the intensity is define as number of photons per unit time.
Radiation beam is energy in the form of waves of particles. There are two forms of radiation which are non-ionizing and ionizing.
Non-ionizing radiation has less energy than ionizing radiation; it does not possess enough energy to produce ions.
Ionizing radiation is capable of knocking electrons out of their orbits around atoms, upsetting the electron/proton balance and giving the atom a positive charge.
Alpha radiation consists of alpha particles that are made up of two protons and two neutrons each and that carry a double positive charge. Due to their relatively large mass and charge, they have an extremely limited ability to penetrate matter.
We know that,
Iabsorbed=P/A ------(1)
where P is the power and A is the area.
P= E/t-------(2)
using (2) and (1)
Iabsorbed=E/tA-----(3)
Now area,
A=πr^2 = 1.19*10^-5 m^2
putting in (3), we get
Iabsorbed = 1.09*10^7 W/m^2
Given only 90% of the beam is absorbed So,
I/100=1.19*10^-5/90
Now the intensity is,
I=1.19*10^-5*100/90
I=1.21*10^7 W/m^2.
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Khan academy need help asap
The correct expression of the acceleration of the object is given as; a = F/m. Option B.
What is the acceleration?We know that the acceleration has to do with the ratio of the force and the mass. The Newton second law can lead us to the definition of the force that acts on an object that does involve the acceleration of the object.
We then have;
F = ma
F = force on the object
m = mass of the object
a = acceleration of the object
Then we have;
a = F/m
This is the acceleration of the woman.
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the small piston of a hydraulic lift (see figure below) has a cross-sectional area of 3.30 cm2, and its large piston has a cross-sectional area of 204 cm2. what downward force of magnitude f1 must be applied to the small piston for the lift to raise a load whose weight is fg
The downward force of magnitude must be applied to the small piston for the lift to raise a load whose weight is Fg = 15.0 kN is 225N.
Given that,
The small piston of a hydraulic lift has a cross-sectional of 3.00 cm^2.
And its large piston has a cross-sectional area of 200 cm^2.
Based on the above information, the calculation is as follows:
Here we use the Pascal's principle,
........... (1)
Here
F denoted Force exerted on the larger piston,
f denoted force that applied to the smaller piston,
A denoted cross-sectional area of the larger piston,
And, a denoted cross-sectional area of the smaller piston.
Now
= 225 N
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moons that show few craters probably
Moons that display few craters presumably. They all pass straight over the equator of the globe. Uranus's five biggest moons. have the closest magnetic field axis.
Which 4 moons are known?There are many fascinating moons around the globe, but the Galilean satellites—Io, Europa, Ganymede, and Callisto—the first four moons identified beyond Earth—hold the most scientific curiosity.
Can Earth have Two moons?Moon and Earth
The basic explanation is that Earth only has one moon, that we name “the moon”. It is the biggest and brightest object in the night sky, and the only solar system body except Earth that humanity have visited in our space travel activities.
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a(n) 1.21 kg sphere makes a perfectly inelastic collision with a second sphere that is initially at rest. the composite system moves with a speed equal to one-third the original speed of the 1.21 kg sphere. what is the mass of the second sphere? answer in units of kg.
The mass of the second sphere is 2.42kg when a 1.21 kg sphere makes a perfectly inelastic collision with a second sphere that is initially at rest.
Given mass of first sphere (m1) = 1.21kg
initial speed of second sphere (u2) = 0 as it is at rest
Let initial speed of first sphere = u1
let mass of second sphere = m2
speed of composite system after collision (v) = 1/3u1
We know from the conservation of momentum we have :
m1u1 = (m1+m2)v
1.21xu1 = (1.21+m2)x1/3u1
m2 = 3.63 - 1.21 = 2.42 kg
Hence the mass of second sphere = 2.42kg
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fire hoses used in major structural fires have an inside diameter of 6.40 cm suppose such a hose carries a flow of 40.0 l/s, starting at a gauge pressure of 1.62 x 106n/m2 the hose rises up 10.0 m along a ladder to a nozzle having an inside diameter of 3.00 cm. what is the pressure in the nozzle?
The pressure in the nozzle greater than 2000.
A diameter of a circle is any instantly line section that passes through the center of the circle and whose endpoints lie at the circle. it could additionally be described because the longest chord of the circle. both definitions also are valid for the diameter of a sphere.
Calculation:-
Volume = 6.4× 3 × 10
= 192cm³
P= nRT/V
= 2000
A nozzle is a device designed to manipulate the course or traits of a fluid glide (especially to increase velocity) because it exits (or enters) an enclosed chamber or pipe.
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Which of the following statements about your derivation of the ideal gas law are true? Check all that apply. The Equipartition Theorem implies that )-G). O(2)Z) owing to inelastic collisions between the gas molecules. With just one particle in the container, the pressure on the wall (at z - Lz) is independent of Ly and L. O With just one particle in the container, the average force exerted on the particle by the wall (at -Lz) is independent of Ly and Lz Submit Previous Answers Request Answer
The equipartition theorem predicts that (Vx)²=(Vy)². The average force this wall applies to a particle in a container containing a single particle is independent of Ly& Lz.
The equipartition theorem establishes a connection between a system's temperature and average energy in classical statistical mechanics. Other names for the equipartition theorem include the law of equipartition, the equipartition of energy, and just the word "equipartition." A molecule's average kinetic energy per degree of freedom in translational motion should be equal to that in rotational motion, for example, according to the basic concept of equipartition, which states that energy is distributed equally among all of its many forms in thermal equilibrium.
Quantitative predictions are made using the equipartition theorem. Similar to the virial theorem, it provides the total average kinetic and potential energies for a system at a specific temperature, allowing one to calculate the system's heat capacity. Equipartition, however, also provides the average values for each of the energy's component parts.
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Imagine that you are hovering next to a space shuttle and your buddy of equal mass
who is moving a 4 km/h with respect to the ship bumps into you. If he holds onto
you, how fast do you both move with respect to the ship?
The total momentum vectors will not change prior to or following a collision. When two objects collide at an angle from one another, their momentum will not change. Thus, the momentum of objects colliding remains constant.
What fast you both move with respect to the ship?Because momentum is dependent on mass and velocity, objects in space can have momentum. Mass is a property that does not change depending on where an object is, unlike other properties like weight.
Simply said, mass is the continuous amount of matter that makes up an item. Thus, momentum is a property of objects in space.
Therefore, Both the ship and the individual are moving at a 2 km/h rate.
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Describe specific heat and explain one way that this is important to humans.
Water has a high specific heat, thus it takes a lot of heat to raise its temperature. This keeps the surroundings from getting overly hot or chilly.
Why is specific heat crucial for the human body?A substance can absorb more heat energy before changing when it has a high specific heat. 70% of the human body is made up of water. Thus, the high specific heat of water ensures that the body's temperature is maintained. Additionally, it functions as a heat energy regulator.Water has a high specific heat, thus it takes a lot of heat to raise its temperature. This keeps the surroundings from getting overly hot or chilly. Humans contain around 66% water, so this feature of water also aids in the regulation of our body temperature.To learn more about Specific heat refer to:
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the wall of a large room is covered with acoustic tile in which small holes are drilled 1.9 mm from center to center. how far can a person be from such a tile and still distinguish the individual holes, assuming ideal conditions? assume the diameter of the pupil of the observer's eye to be 4.00 mm and the wavelength of the room light to be 515.0 nm.
To distinguish the individual holes, the minimum distance between the person and the tile is 29.8mm ≈30 mm.
What is wavelentgh?Wavelength can be defined as the distances between 2 successively Crest or the throughs of any wave.
According to Rayleigh's criterion, the angular separation between two point sources is given as follows.
8 = 1.22A d
Here, λ = wave length,
d =circular aperture diameter.
Since the regular separatione is very small, the value of sine is nearby equal to e=㏑
Where D is the center-to-center distance between two point lights and L is the distance from the screen to the light source.
Substitute for e in the above equation 1.22A
8 =d
To obtain the expression for L as
D /L= 1.22A /d
Rearrange the mentioned equation for L as follows:
L = Dd d1.22A
Substitute 0.005m for D, 0.004m for d, and
550 × 10⁻⁹m for λ in the above equation
L = (Dd)/(1.22lambda) to obtain the values of L as follows:
L = ((0.005m)(0.004m))/(1.22(550 × 10 ⁻⁹ m))
L =29.8mm
Thus, the distance between the person from the tile distinguishes the individual holes.
(Rounding off to two significant figures) is 30 m.
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determine the magnitude of the gravitational force mars would exert on your body if you were on the surface of mars.
The magnitude of the gravitational force mars would exert on your body if you were on the surface of mars 252.6 N.
Why is it called gravitational force?Because it consistently attempts to pull objects together rather than pushing them apart, the gravitation force is known as attractive. It is obvious that the gravitational force directly relates to the masses of the two interacting objects; larger, more massive stars will pull apart with a stronger gravitational force. Because of size of the Earth and how far out from its core humans are on its surface, attraction (or the acceleration caused by gravity) equals 9.81 m / sec squared on Earth's surface.
Briefing:Newton's Law of Gravitation is used to mathematically determine the force between two bodies.
[tex]$F=G \frac{M m}{r^2}$[/tex]
[tex]$F=6.674 * 10^{-11} * \frac{68 * 6.42 * 10^{23}}{3396000^2}=252.6 \mathrm{~N}$[/tex]
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The complete question is-
Determine the magnitude of the gravitational force Mars would exert on man if he was on the surface of Mars. The mass of the man is 68.0 kg . The mass of the Mars is 6.42×1023kg and its radius is 3396 km
A charge Q exerts a 12 N force on another charge q. If the distance between the charges is doubled. of the force exerted on Q by q? what is the magnitude a) 3N b)6N c) 24N d) 28N
Answe8889
Explanation:
Ok, so add the five to 9. Then please subtract your sum from 885
A leaky faucet drips 40 times in 30s what is the frequency of the dripping?
The frequency of the dripping of a leaky faucet which drips 40 times in 30s is 1.3 Hz.
What is frequency?
Frequency is the number of occurrences of a repeating event per unit time. For clarity, this is also called temporal frequency, which is different from angular frequency. Frequency is measured in hertz (Hz) and corresponds to one event per second. Duration is the reciprocal of frequency because duration is the time interval between events.
For example, if his heart beats 120 times per minute (2 hertz), then the period T (interval between repeated beats) is 0.5 seconds (60 seconds divided by 120 beats). Frequency is an important parameter used in science and technology to describe the speed of vibrations and vibrational phenomena such as mechanical vibrations, audio signals (sound), radio waves, and light.
Therefore, The frequency of the dripping of a leaky faucet which drips 40 times in 30s is 1.3 Hz.
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the signal detected by a doppler radar is: question 8 multiple choice options a radiowave emitted by lightning a soundwave produced by thunder a radiowave reflected by precipitation a soundwave produced by wind shear
The signal detected by a Doppler radar is: a radio wave reflected by precipitation
How does Doppler radar works?Doppler weather radar determines the speed of precipitation in the atmosphere, that is somewhere near to the radar. Precipitation as it falls generally moves with the wind, this the wind velocity can be determined with doppler technology.
It uses doppler effect. It refers to the change in wave frequency when their occurs a relative motion between a wave source and its observer
A Doppler radar uses electromagnetic radiation waves that can detect how far away precipitation takes place.
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when a weight w is hanging from a light vertical string, the speed of pulses on the string is v. if a second weight w is added without stretching the string, the speed of pulses on this string will now become. true or false?
It is false to say that speed of pulse remains v after adding the second weight w on the vertical string.
We know very well that speed of transverse wave v in a string is given by:
v=√T / √μ
where,
T represents the tension in the string
μ represents the linear mass density defined for the string
Now, in the given situation,
when weight is hanging on light vertical string is W, speed of the wave v is :
v=√W / √μ ----(eq1)
On addition of an additional weight of W, speed of the wave becomes v ' as :
v′ = √2W /√μ -----(eq2)
After comparing eq1 and eq2, we observe that
after addition of same amount of weight in the given light string, speed will increase by √2 times the previous speed.
Hence, the given statement is false.
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what is the relationship between voltage and energy? more precisely, what is the relationship between potential difference and electric potential energy?
Voltage is usually known as potential difference, which is the difference of potentials at two different points. Amount of work done to move a unit positive charge from one point to other is potential difference.
What is the relationship between electric potential energy and potential difference?Voltage is the electric potential energy per unit charge, which is measured in joules per coulomb ( volts). It is referred to as electric potential which must be distinguished from electric potential energy by understanding that potential is a per-unit-charge quantity.
The potential difference between points A and B, VB−VA, is defined to as the change in potential energy of a charge q moved from A to B, and then divided by the charge.
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which tools do astronomers use to determine the effects of collisions between galaxies? select the two correct answers.(1 point)
Astronomers use space telescopes to determine the effects of collisions between galaxies.
A space telescope could be a telescope in outer space utilized to watch astronomical objects. Space telescopes avoid the sifting and distortion of electromagnetic radiation which they observe, and maintain a strategic distance from light pollution which ground-based observatories experience. They are divided into two sorts, such as Satellites which outline the entire sky, and satellites which center on selected galactic objects or parts of the sky and beyond. Astronomy deals with the study of external space. The study centers on planets and other celestial bodies. For the most part, telescopes are utilized to study external space.
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which tools do? select the two correct answers. (1 point)
computer simulations
print encyclopedia entries
space telescopes
solar system models
Correctly identify the following formed elements. eBook Lymphocyte Neutrophil Eosinophil Platelets Monocyte Basophil Prev 1 of 17 Next >
Granulocytes (neutrophils, eosinophils, and basophils), monocytes, and lymphocytes are different kinds of white blood cells (T cells and B cells). Histamine is released by basophils to elicit an all-purpose immune response.
While battling germs and parasites, eosinophils can also cause allergic symptoms. B and T cells that function as lymphocytes protect the body from particular invaders. Monocytes remove dead cells from the body. Granulocytes, lymphocytes, and monocytes are the three primary types of white blood cells according to medical experts. All of the body's components receive nutrition and oxygen so they can continue to function. The lungs, kidneys, and digestive system use the blood to transport carbon dioxide and other waste products to be expelled from the body. Additionally, blood transports hormones throughout the body and fights infections.
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Which of the following is the correct relationship of wavelength and frequency of EM waves?
a) λ = c / r
b) λ = c / f
c) λ = c / h
d) λ = h*c / f
Answer:
c=f⋅λ (The speed of light is directly proportional to f and λ).
Explanation:
what is the apparent weight of a 0.80 g drop of water
Therefore, the apparent weight of 1.1 g of water is 3.57 N.
What is apparent weight?
According to physics, an object's perceived weight is a characteristic that describes how heavy it is. When the force of gravity acting on an item is not counterbalanced by a force of equal but opposite normality, the apparent weight of the object will differ from the actual weight of the thing.
given
Speed of rotation, N = 1300 rpm
diameter, d = 35 cm, so that
radius, r = 17.5 cm = 0.175 m
mass of drop = 0.80 g = 0.80 *10^-3 kg
Angular speed of water, ω = 2πN/60
ω = 2π*1300/60
ω = 8169.2/60
ω = 136.15 rad/s
apparent weight will be gotten by
W(a) = mω²r
W(a) = 0.80*10^-3 * 136.15² * 0.175
W(a) = 0.80*10^-3 * 18536.82 * 0.175
W(a) = 3.57 N
Therefore, the apparent weight of 1.1 g of water is 3.57 N.
Complete question: The spin cycle of a clothes washer extracts the water in clothing by greatly increasing the water's apparent weight so that it is efficiently squeezed through the clothes and out the holes in the drum. In a top loader's spin cycle, the 35-cm-diameter drum spins at 1300 rpm around a vertical axis.
What is the apparent weight of a 0.80 g drop of water?
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if column a gets heated what happens to the ball
Answer:-A metal ball is made up of atoms having minimum interatomic distance, so when we heat the metal its atoms actually vibrate about their mean position and thus colliding with neighboring atoms and making them to vibrate, due to this continuation process metals size increases or metal expands on heating.
When heat is added to a substance, the molecules and atoms vibrate faster. As atoms vibrate faster, the space between atoms increases. The motion and spacing of the particles determines the state of matter of the substance. The end result of increased molecular motion is that the object expands and takes up more space “Steel will expand from 0.06 percent to 0.07 percent in length for each 100oF rise in temperature. The expansion rate increases as the temperature rises. Heated to 1,000oF, a steel member will expand 9½ inches over 100 feet of length When a metal ring is heated both inner and outer radii increase. This can be understood better by visualizing that the ring in reality is a rod bent into a circle. That rod will expand upon heating. The same bar bent into a ring thus also expands.
true or false: the quantities di and do are measured from the lens (or mirror).
The quantities di and do are measured from the lens (or mirror): False.
True statement: The quantities of di and do are not measured from the lens (or mirror).
What is lens?A lens is a piece of transparent material that is typically round in form with two polished surfaces that are either convex (bulging) or concave on one or both sides (depressed). In other words, the radius of curvature is constant since the curves are virtually always spherical.
Lenses are a common component of telescopes, binoculars, and cameras, among other image equipment. Additionally, they are utilized as visual aids in spectacles to treat vision problems including myopia and hypermetropia.
The statement is false.
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suppose we found out that there is no dark matter in galaxies. what is an alternate explanation of the rotation curve?
Our understanding of gravity is wrong for great distances is an alternate explanation of the rotation curve.
What is galaxies and its types?Astronomers classify galaxies into three basic categories: elliptic, spiral, and irregular. These galaxies come in a wide range of sizes, from star clusters with as few as 25 million stars to massive galaxies with more than a trillion stars.
How do galaxies develop?Massive gas clouds that collapse + rotate are the starting point for galaxies. Stars develop within them as they develop. The collision of entire galaxies can alter their appearance. We can view planets at earlier stages of evolution by gazing deep into space, which helps us understand how galaxies evolve.
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consider each of the electric- and magnetic-field orientations given next. in each case, what is the direction of propagation of the wave? (a) es in the x-direction, bs in the y-direction; (b) es in the -y-direction, bs in the x-direction; (c) es in the z-direction, bs in the -x-direction; (d) es in the y-direction, bs in the -z-direction.
The direction of the propagation of the wave is -x direction.
The direction of the propagation of the wave in each case are:
A) +z direction
B) +z direction
C) -y direction
D) -x direction
\vec Ein is the Electrical field vector and \vec Bin is the Magnetic field vector, because the field vectors are always perpendicular to each other the propagation of the wave is perpendicular to the two vectors. The direction of the propagation of the wave can be found by \vec Ein X \vec Bin (Cross product of two vectors). This can also be done by using the RIGHT HAND RULE.
Cross product can be found by
i x j = k and j x i = - k
j x k=i and k x j = - i
k x i=j and i x k = - j
where i represents the +x direction, j represents the +y direction and k represents the +z direction
The RIGHT HAND RULE can be used to illustrate the cross product by using the right hand and pointing the index finger in the direction of the first vector and the middle finger along the second vector, the cross product is in the direction of the thumb.
A) \vec Ein the +x direction,\vec Bin the +y direction,
Finding the cross product of the two vectors (i x j = k) would give a vector in the +z direction
B) \vec Ein the -y direction,\vec Bin the +x direction
Finding the cross product of the two vectors (- j x i = k) would give a vector in the +z direction
C) \vec Ein the +z direction,\vec Bin the -x direction
Finding the cross product of the two vectors (k x - i = - j) would give a vector in the -y direction
D) \vec Ein the +y direction,\vec Bin the -z direction
Finding the cross product of the two vectors (j x - k = - i) would give a vector in the -x direction
The direction of the propagation of the wave is -x direction.
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Water used for dialysate must be treated because dialysis patients?
Dialysis patients are exposed to huge amounts of water during dialysis, hence water used for dialysate must be treated. the liquid and dissolved substances in a dialysis procedure that just pass through the dialyzer.
Additionally, as they cannot travel through the semipermeable membrane, they are thrown together with the harmful compounds that have been removed once the water has returned from the Dialysis. Dialysis patient with excessive fluid intake. Fluid overflow or hypervolemia is the medical term for having too much water in your body. Fluid homeostasis in the body is one of the kidneys' primary roles. A buildup of excess fluid in the body can have negative impacts on your health, including breathing problems and swelling.
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what is the upper block's acceleration if the coefficient of kinetic friction between the block and the table is 0.21?
Answer:
0.21 brokies
Explanation:
A crate slides down a ramp that makes a 20∘ angle with the ground. To keep the crate from sliding too fast, Paige pushes back on it with a 67 N horizontal force.
The energy an object has as a result of motion is known as kinetic energy.
What Factors Affect Kinetic Energy? Mass and speed are the two elements that have an impact on kinetic energy. If neither of these two things changes, an item keeps its kinetic energy. The kinetic energy of an item varies with changes in mass or speed.In other words, when an object's mass doubles, so does its kinetic energy because kinetic energy increases as the square of the speed.An object's kinetic energy doubles for every two times it moves at the same speed. Imagine two identical cars, one of which is moving at a speed that is twice as fast as the other. Accordingly, assuming equivalent braking forces, the quicker car will need to travel four times farther to stop than the slower car.On the other hand, doubling the speed of the quicker car requires four times as much work.
The Complete Question is Kinetic Energy.
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a child in a tree house uses a rope attached to a basket to lift a 26 nn dog upward through a distance of 5.0 mm into the house.
Total work done is 0.13 Joules
What is work done ?The sum of the displacement and the component of the applied force of the object in the displacement direction is the work done by a force.
According to the given information
We need to find the work done
work done = force × distance
We are given,
force = 26 N
Distance = 0.0005 meter
hence ,
Work done = 26 × 0.005
= 0.13 Joules
Total work done is 0.13 Joules
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The net force exerted on a car traveling in a circular path at constant speed is
A) directed toward the center of the curve. B) zero because the car is not accelerating. C) directed forward, in the direction of travel. D) none of the above
At each point in a circular journey, an object's direction and speed change. Centripetal force is the name given to the force that results in this velocity or acceleration. Thus, option B is correct.
What net force exerted on a car travelling in a circular path?Centripetal force is felt by a vehicle travelling in a circle. A circularly moving body is subject to a centripetal force that pushes toward the center of the circle it is travelling in.
Therefore, Centripetal force is the force that keeps an object moving in a circular motion when it is travelling due to velocity, or its speed in a particular direction. By attracting an object to a circle's center, it achieves this.
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