Answer:
A child holds the bar of a set of weights without moving I think
how can we change the frequency of the wave
Answer:
.Also we can change the frequency by decreasing wavelength , or increasing velocity
Explanation:
which direction should a ceiling fan turn in the summer
Show that the square of the period of revolution of a satellite is directly proportional to the cube of the orbital radius
Answer:
Explanation:
If a proton and an electron are released when they are 2.0 * 10-10 m apart (a typical atomic distance), find the initial acceleration of each particle.
The initial acceleration of proton and electron is 3.45 x 10¹⁸ m/s² and 6.33 x 10²¹ respectively.
What is electrostatic force?The electrostatic force F between two charged objects placed distance apart is directly proportional to the product of the magnitude of charges and inversely proportional to the square of the distance between them.
F = kq₁q₂/r²
where k = 9 x 10⁹ N.m²/C²
Given is the charge on proton and electron is q =1.6 x 10⁻¹⁹ C, distance r =2 x 10⁻¹⁰m , then the force will be
F = k q²/r²
Substituting the above values in the formula, we get the electrostatic force,
F = (9 x 10⁹) (1.6 x 10⁻¹⁹)²/(2 x 10⁻¹⁰)²
F = 5.76 x 10⁻⁹ N
The acceleration of electron when both proton and electron released is
acceleration = electrostatic force / mass of electron
Putting the values, we have initial acceleration of electron
a = (5.76 x 10⁻⁹)/(9.1 x 10⁻³¹)
a = 6.33 x 10²¹ m/s²
The acceleration of proton is due to the electrostatic force of attraction between proton and electron is given by
acceleration = electrostatic force / mass of proton
inserting the values, we get the initial acceleration
a '= (5.76 x 10⁻⁹)/( 1.67 x 10⁻²⁷)
a'= 3.45 x 10¹⁸ m/s²
Thus, initial acceleration of proton and electron is 3.45 x 10¹⁸ m/s² and 6.33 x 10²¹ respectively.
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Select all the correct answers. which two statements are true about all generators? they convert motion energy to electric energy. they have a fixed pair of magnets and a rotating metal coil. they’re powered by fossil fuels. they convert electric energy to motion energy. they use the relative motion of a magnet and a coil of wire.
The two correct statements about generators are, they convert motion energy to electric energy and they use the relative motion of a magnet and a coil of wire.
What are generators?Generators are devices which convert mechanical energy into electrical energy.
Generators work by the laws of electromagnetism.
There are two types of generators, A.C. and D.C. generators.
Therefore, the two correct statements about generators are, they convert motion energy to electric energy and they use the relative motion of a magnet and a coil of wire.
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HELP PLEASE
Which is true about the price of sustainable buildings?
It is generally less expensive over the lifetime of the building, due to lower energy costs in production of the materials and lower energy bills,
It is almost always less expensive upfront because insulation is so inexpensive.
It is almost always more expensive, but businesses choose to construct them anyway because climate change is a priority for them.
It is generally more expensive over the lifetime of the building, which is an issue that should be weighed in a cost-benefit analysis.
Sustainable buildings are generally less expensive over the lifetime of the building, due to lower energy costs in production of the materials and lower energy bills. Option A is correct.
What is sustainable buildings?Sustainable buildings refer to both a structure and the implementation of environmentally responsible and resource-efficient methods.
Sustainable buildings are generally less expensive over the lifetime of the building, due to lower energy costs in production of the materials and lower energy bills,
Hence,option A is correct.
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3. Classify the different types of spectra by how they are created. Physical science
Answer:
Most light sources can be classified into three main types: continuous, absorption, and emission. A hot, opaque object, like the filament in an incandescent light bulb, emits a continuous spectrum, having light of all wavelengths. A hot, dense gas is another example of an object that emits a continuous spectrum.
Explanation:
What is the acceleration along the ground of a 10 kg wagon when it is pulled with a force of 44 n at an angle of 35° above the horizontal? 0.23 m/s2 0.28 m/s2 2.52 m/s2 3.60 m/s2
Based on the calculations, the acceleration of this wagon along the ground is equal to: D. 3.60 m/s².
Given the following data:
Mass = 10 kg.
Angle = 35°
Force = 44 Newton.
How to calculate the acceleration along the ground?In accordance with Newton's Second Law of Motion, the net force acting on this wagon is equal to the horizontal component of the force that is parallel to the slope:
F = macosθ
Substituting the given parameters into the formula, we have;
44 = 10 × a × cos35
44 = 10a × 0.8192
44 = 8.192a
a = 44/8.192
a = 3.60 m/s²
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Please answer these! Will mark brainiest if correct!
Answer:
11 is d. 12 is c. 13 is b. 14 is b. 15 is b.
Explanation:
Marjorie drops an object from a height of h meters, and it hits the ground with a velocity of v m/s, as given by the function v equals the square root of 19.6 h. If the velocity of the object is 68.6 m/s, what was the height of the object before it was dropped? Round your answer to the nearest tenth.
Answer:
240.1 m
Explanation:
Potential energy ( mgh) is fully converted to Kintetic energy ( 1/2 mv^2)
equate them
mgh = 1/2 mv^2 divide by 'm'
gh = 1/2 v^2
9.8 h = 1/2 v^2
19.6 h = v^2 v = sqrt ( 19.6h) (as given)
68.6 = sqrt (19.6 h) solve for h = 240.1 m
Find the force of a 240 kg vehicle accelerating at a rate of 4.5 m/s/s when it hits the wall.
Answer:
1080 Newtons
Explanation:
F = m * a
F = 240kg * 4.5 m/s
F = 1080
The brakes on a 17,600 N car exert a stopping force of 650. N. The car’s velocity changes from 25.0 m/s to 0 m/s.
a) What is the car’s mass?
b) What was its initial momentum?
c) What was the change in momentum for the car? d) How long does it take the braking force to bring the car to rest?
(a) The mass of the car is 1,795.92 kg
(b) The initial momentum of the car is 44,897.96 kgm/s.
(c) the change in momentum for the car is 44,897.96 kgm/s..
(d) The time it takes the braking force to bring the car to rest is 69.4 s.
Mass of the carThe mass of the car is calculated as follows;
W = mg
m = W/g
m = (17,600)/9.8
m = 1,795.92 kg
Initial momentum of the carPi = mvi
Pi = 1,795.92 x 25
Pi = 44,897.96 kgm/s
Change in momentum of the carΔP = Pf - Pi
ΔP = 0(1,795.92) - 44,897.96 kgm/s
ΔP = - 44,897.96 kgm/s
Time taken for the car to come to restF = ma
-650 = 1,795.92(a)
a = -650/1,795.92
a = -0.36 m/s²
v = u + at
0 = 25 - 0.36t
0.36t = 25
t = 69.4 s
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The products of nuclear fission have slightly less mass than the original atom that undergoes fission. During the process, a very large amount of energy is produced. What do you think happens to the "missing" mass in a fission reaction?
Answer:
missing mass has been converted to energy according to Einstein mass energy equation
How long will it take a runner, starting from rest and accelerating uniformly at 1.5 m/s2, to travel 3.0 m
What is the wavelength a wave if it has a frequency of 7,143 Hz and a velocity of 1,151 m/s?
Wavelength = 0.16m to 2.dp
Wavelength = wave speed / frequency
= 1,151 ÷ 7,143
= 0.1611367773
Hope this helps!
12. What are the components of the vector with a magnitude of 65.0 and a direction of 101.7°?
O (13.2, -63.6)
O (63.6, -13.2)
O (-63.6, 13.2)
O (-13.2, 63.6)
Answer:
V = 65 at 101.7 deg
Vx = V cos θ = 65 cos 101.7 = -13.2
Vy = V sin θ = 65 sin 101.7 = 63.6
The last option is correct
What is physics and how does it affect every day life
Explanation:
Physics, or the study of matter, energy, and the interactions between them, helps us to understand the laws and rules that govern the physical world.
In classical physics, relative motion is absolute. For example, consider an object moving in a straight line with speed v0 on a platform. If the platform is moving with speed vp in the same direction relative to the ground, the object will be moving with speed v0 + vp relative to the ground. However, it is known that the speed of light is the same for all observers regardless of reference frame, which contradicts the classical model of relative motion. Which of the following statements is a conclusion that could be drawn from this contradiction?А. There are no absoluta celerence frames.B. All physical quantities are the same in al reference frames.C. Light can be described by a wave model and a particle model.D. Observers in different reference frames will measure time and distance differently.
Answer:
d) observers in different reference frames will measure time and distance differently
The speed of sound in water is 1,492 m/s. A sonar signal is sent straight down from a ship at a point just below the water's surface and 7.5 s later the reflected signal is detected. How deep is the ocean beneath the ship?
Answer:
5595 m
Explanation:
The wave travels down (the depth) and the back up (the depth again)
this distance is 2 d
2 d = 1492 m/s * 7.5 s
2d = 11190 m
d = 5595 m
What is the difference between
longitudinal waves that have
different amplitudes?
Answer:
Wave amplitude of a transverse wave is the difference of height between a crest and the resting position. Wave amplitude of a longitudinal wave is the distance between particles of the medium where it is currently compressed by the wave.
Answer:
A wave caused by a disturbance with more energy has greater amplitude
Explanation:
How does the ratio of tin to copper affect the properties of the alloy bronze?
Answer:
Stronger and harder than either of the pure metals
Explanation:
what do you mean by impulse ratio?
Two electrons (-1.6 x 10-19 C) are separated by an insulator at a distance of 0.10 mm. Which of the following is the electrostatic force between these electrons?
The electrostatic force between these electrons will be 2.3×10⁻²⁰ N.
What is Columb's law?The force of attraction between two charges, according to Coulomb's law, is directly proportional to the product of the charges and inversely proportional to the square of the distance between them.
Charges that are similar repel each other, whereas charges that are diametrically opposed attract each other.
They will repel, moving in opposite directions at the same speed. Because the magnitude and nature of the charge are same.
The electrostatic force between these electrons is;
[tex]\rm F= \frac{Kq_1q_2}{r^2} \\\\ F=\frac{9 \times 10^9 \times -1.6 \times 10^{-19} \times- 1.6 \times 10^{-19} }{(0.10 \times 10^-3)^2} \\\\F= 2.3 \times 10^{-20} \ N[/tex]
Hence, the electrostatic force between these electrons will be. 2.3×10⁻²⁰ N.
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Which electromagnetic has the shortest wavelength?.
Answer:
Gamma rays
Explanation:
The symbol most often used to describe density is?
Answer:
he density, or more precisely, the volumetric mass density, of a substance is its mass per unit volume. The symbol most often used for density is ρ
Explanation:
derive a relation between critical angle and refractive index of a substance
Answer:
Explanation:
Refractive index of denser medium w.r.t rarer medium
[tex]r[/tex]ч[tex]d[/tex][tex]=\frac{1}{sini_{c} }[/tex]
where, [tex]i_{c}[/tex] = critical angle
A weight lifter does 586 J of work on a weight that he lifts in 3.5 seconds. What is the power with which he lifts the weight?
need help fast please
Answer:
Explanation:
The quantity of energy transferred by a force when it is applied to a body and causes that body to move in the direction of the force work.
The theoretical capacity of a process is the reciprocal of the theoretical flow time of the process. Do you agree? Explain.
I do not agree with the statement 'theoretical capacity of a process is the reciprocal of the theoretical flow time of the process' because time is only one variable.
What is theoretical capacity?The theoretical capacity of a process can be defined as the ability to perform a given work in a given period of time.
The theoretical capacity of a process is not only dependent on the time that takes to carry out but also on other variables (e.g., temperature, light conditions, etc).
In conclusion, I do not agree with the statement 'theoretical capacity of a process is the reciprocal of the theoretical flow time of the process' because time is only one variable.
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Which of the following summarizes cellular respiration?
Oxygen reacts with glucose to produce carbon dioxide and water, and release energy.
Light energy is changed into chemical energy.
Light energy is used to join water and carbon dioxide to make oxygen and glucose.
Chemical energy is changed into light energy.
The statement which summarizes cellular respiration is Oxygen reacts with glucose to produce carbon dioxide and water, and release energy.
What is cellular respiration?Cellular respiration is the process by which food, in the form of glucose is transformed into energy within cells.
The food is prepared by the plants by the process of photosynthesis in presence of sunlight. This food is in the form of glucose.
The respiration of plants is done by breaking of glucose by absorbing oxygen. This produces carbon- di- oxide and water along with the release of energy.
Thus, the cellular respiration is oxygen reacts with glucose to produce carbon dioxide and water, and release energy.
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A wave is sent down a tunnel where it travels and bounces of the far wall, returning to the sender. The wave travels at 4m/s and it takes 120 seconds to travel there and back. How deep is the cave?
Answer:
100ft
Explanation:
