An object has one force acting on it. It is a 33- Newton force pointing downward. To create a net force of zero on the object, which force must be applied to it?

Answer:

Explanation:

No sound is heard , that means there is destructive interference at the place where sound is heard .

Path difference of the source of sound = 1.425 m - 1.230 m

= 0.195 m

Let frequency of sound be n .

wave length = velocity of sound at 0°C / n

λ = 330 / n

for destructive interference ,

path difference = ( 2m+1) λ /2 , where λ is wave length of sound.

0.195 m = ( 2m+1) λ /2

0.195 m = ( 2m+1)330 / 2n

2n = 1692.3 (2m+1)

If m = 0

n = 846 . which is nearest to given frequency of 993 Hz

So 993 Hz is the answer.

Answer:

9000

Explanation:

f=ma

f= force

m=mass

a=acceleration

f=ma

4500×2.0

9000N

Answer:

The frequency is  5.4 × 10^14Hz

Explanation:

The frequency of yellow-green light with a wavelength of 560 nm is approximately 5.4 x 10¹⁴ Hz.

The frequency of yellow-green light with a wavelength of 560 nm can be calculated using the formula:

frequency = speed of light/wavelength

Where the speed of light is approximately 3.0 x 10⁸ meters per second.

First, we need to convert the wavelength from nanometers to meters by dividing by 10⁹:

560 nm = 560 x 10⁻⁹ m

Then, we can plug in the values and calculate the frequency:

frequency = (3.0 x 10⁸ m/s) / (560 x 10⁻⁹ m)

frequency ≈ 5.4 x 10¹⁴ Hz

Therefore, yellow-green light with a wavelength of 560 nm has a frequency of approximately 5.4 x 1014 Hz.

To know more about the frequency of light follow

https://brainly.com/question/29213586

#SPJ6

Ray B. isn't possible for a converging lens, because after passing through focus ot would go parallel to the principal axis,

So, Correct option is :

=》Option B.)

Answer:

The pressure of the solid on the surface depends on the area of contact. The area of contact between the two surfaces. The greater the force or the smaller the area the greater the pressure.

(credits to the rightful owner for these answers :)

Solution :

Placing the[tex]$3 \ kg$[/tex] mass at the [tex]$\text{origin}$[/tex] and line up the square up with the axes.

[tex]$x_{cm} = \frac{\sum_i x_i m_i}{\sum_i m_i }$[/tex]

     [tex]$=\frac{1.5 a + 1.5a +0 +0}{7.5}$[/tex]

     [tex]$=\frac{3a}{7.5}$[/tex]

    [tex]$=\frac{2a}{5}$[/tex]

[tex]$y_{cm} = \frac{\sum_i y_i m_i}{\sum_i m_i }$[/tex]

     [tex]$=\frac{1.5 a + 1.5a +0 +0}{7.5}$[/tex]

     [tex]$=\frac{3a}{7.5}$[/tex]

    [tex]$=\frac{2a}{5}$[/tex]

Therefore,  r = [tex]$\sqrt2 \left(\frac{2a}{5}\right)$[/tex]

                           [tex]$=\frac{2 \sqrt2}{5}a$[/tex]

It s given that the side of the square is a = 32.2 cm

So, r [tex]$=\frac{2 \sqrt2}{5}a$[/tex]

       [tex]$=\frac{2 \sqrt2}{5}\times 32.2$[/tex]

       = 18.21 cm

So the distance of the 3 kg mass from the center of mass, r= 18.21 cm

Answer:

A,B,C,D,F,G

Explanation:

Edge 2021

The atoms, subatomic particles, particles that are 10^-9m, microtechnology systems, neutrons and particles that are 10^-3m  will displays the effects of quantum mechanics.

Quantum Mechanics is the branch of mechanics deals with the mathematical description of the motion and interaction of subatomic particles, incorporating the concepts of quantization of energy, wave–particle duality, the uncertainty principle, and the correspondence principle is Quantum Mechanics.

It is theory says at subatomic level, energy exists in discrete levels as "quanta" and particles behave as waves.

A Subatomic particles are the particle that are present inside an atom. These particles are electrons, protons, and neutrons.

Thus, atoms, subatomic particles, particles that are 10^-9m, microtechnology systems, neutrons and particles that are 10^-3m  will displays the effects of quantum mechanics.

Learn more about Quantum Mechanics;

brainly.com/question/7221719

#SPJ2

Answer:

Explanation:

vector A =(3i^+4J^-2k^),

let the required vector is B = x i^ + y j^

sqrt (x2 + y2) = 5,  

x2 + y2 = 25  ..............(1)

Since vector A and B are perpendicular to each other then,

A.B = 0

3x + 4 y = 0

y = -3x/4 ..............(2)

Solving these two equations we get x = 4 and y = -3;

hence vector B = 4 i^ -3 j^

Answer:

1) ngle of incidence and reflection are equal,  light carries does not change

2) the angle of this line with respect to the surface is 90º

3) protractor

4)    n₂  sin θ₂ = n_1 sin θ₁,  light ray must have a greater angle than the incident ray ,

Explanation:

1) When light falls on a reflective surface, the angle of incidence and reflection are equal and as it travels in the same medium, the speed that the light carries does not change

2) The normal is a line perpendicular to the point of incidence of light, so the angle of this line with respect to the surface is 90º

3) Angles are measured with a protractor

4) When light passes from one medium to another, the speed of the ray changes due to the difference in the refractive index in each medium, due to this change in speed the transmitted light ray must have a greater angle than the incident ray , since the speed increases as the density of the medium decreases

           [tex]\frac{sin \theta _2}{ sin \theta_1} = \frac{v_2}{v_1}[/tex]

          [tex]\frac{c}{v_2} \ sin \theta_2 = \frac{c}{v_1} \ sin \theta_1[/tex]

          n₂  sin θ₂ = n_1 sin θ₁

Answer:

nuclear fission!!!

The nuclear fission is taken place in the given reaction.

          Nuclear fission reaction is the process how the larger energy particles hit by a neutron and separated into lighter elements with some energy. The lighter elements can exhibit energy in the form of electromagnetic radiation and in the form of kinetic energy.

        For an example, the most known nucleus is Uranium - 235. This Uranium - 235 has the half life period of 740 million years. The Uranium - 235 when bombarded with neutrons, this causes the U-235 nucleus to split, producing, on average, Barium-141, Krypton-91, and  three neutrons.

        The given reaction is thus a nuclear fission reaction.

Thus, Option A is the correct answer.

Learn more about Nuclear fission reaction,

https://brainly.com/question/913303

#SPJ2

Always here to help. Bring it!!!

Answer:

All magnets have two poles: the North Pole and the South Pole.

Magnets attract ferromagnetic materials such as iron, nickel, and cobalt.

The magnetic force of a magnet is stronger at its poles than in the middle.

A freely suspended magnet always points in North-South direction.

Hope this helps

Answer:

1) [tex]I=1.8*10^{-6}\: W/m^{2}[/tex]  

2) [tex]E=0.037 \: V/m[/tex]

Explanation:

1)

The intensity equation is given by:

[tex]I=\frac{P}{4\pi r^{2}}[/tex]

Where:

[tex]I=\frac{20000}{4\pi (30000)^{2}}[/tex]

[tex]I=1.8*10^{-6}\: W/m^{2}[/tex]  

2)

Now, the intensity and the electric field are related as:

[tex] I=0.5c\epsilon_{0}E^{2}[/tex]

Here:

We need to solve it for E.

[tex]E= \sqrt{\frac{2I}{c\epsilon_{0}}}[/tex]

[tex]E= \sqrt{\frac{2(1.8*10^{-6})}{(3*10^{8})(8.85*10^{-12})}}[/tex]

[tex]E=0.037 \: V/m[/tex]

I hope it helps you!

The final velocity of the boat is 4.22 m/s in opposite direction to the boater.

The final velocity of the boat is determined by applying the principle of conservation of linear momentum as follows;

Let the initial velocity of the boater and the boat = v

[tex]m_1 u_1 + m_2 u_2 = v(m_1 + m_2)\\\\76(2.5) + 45u_2 = 0(76 + 45)\\\\190 + 45u_2=0\\\\45u_2 = -190\\\\u_2 = \frac{-190}{45} \\\\u_2 = -4.22 \ m/s[/tex]

Thus, the final velocity of the boat is 4.22 m/s in opposite direction to the boater.

Learn more about conservation of linear momentum here: https://brainly.com/question/7538238

Answer:

Mass, m = 6.18 kg

Explanation:

Given the following data;

Frequency, F = 10 Hz

Spring constant, k = 250 N/m

We know that pie, π = 22/7

To find the mass, we would use the following formula;

F = 1/2π√(k/m)

Where;

F is the frequency of oscillation.

k is the spring constant.

m is the mass of the spring.

Substituting into the formula, we have;

10 = 1/2 * 22/7 * √250/m

10 = 22/14 * √250/m

Cross-multiplying, we have;

140 = 22 * √250/m

Dividing both sides by 22, we have;

140/22 = √250/m

6.36 = √250/m

Taking the square of both sides, we have;

6.36² = (√250/m)²

40.45 = 250/m

Cross-multiplying, we have;

40.45m = 250

Mass, m = 250/40.45

Mass, m = 6.18 kg

Answer:

8.24 m/s²

Explanation:

Applying,

T = 2π√(L/g).................... Equation 1

Where T = period of the pendulum, L = Length of the pendulum, g = acceleration due to gravity of the planet, π = pi

From the question, we were asked to  find the value of g,

There we make g the subject of the equation

g = 4π²L/T²..................... Equation 2

Given: L= 48 cm = 0.48 m, T = (141/93) s = 1.516 s

Constant: π = 3.14

Substitute these values into equation 2

g = 4(3.14²)(0.48)/(1.516²)

g = 18.93/2.298

g = 8.24 m/s².

Hence the acceleration of the planet is 8.24 m/s²

The proper time between two events is measured by clocks at rest in a reference frame in which the two events occur in Nashville occur at the same coordinates. So, option d.

The perspective from which you perceive and measure things is known as a reference frame. It's applied to describe how an object is moving or where it is.

Here,

Depending on the frame of reference, the time elapsed between two occurrences may vary, according to the Theory of Special Relativity.

The duration between two events occurring in the rest frame, as measured from a reference frame in motion relative to the rest frame, will always be longer than the correct time. Time dilation is a phenomenon that develops in accordance with the relativity of space and time.

A single clock that is present for both occurrences can be used to determine the right time difference between them.

The appropriate time between two events is the amount of time that elapses within a frame in which the two events take place at the same location, to put it another way.

Hence,

The proper time between two events is measured by clocks at rest in a reference frame in which the two events occur in Nashville occur at the same coordinates. So, option d.

To learn more about frame of reference, click:

https://brainly.com/question/1217098

#SPJ2

Most hair dryers are in the 1800 watt range and lets assume you turned it to the highest speed and heat setting.

It will heat up the air in the box, failry quickly. Rules of thermodynamics says that the heat will increase the temperature according to the rate of heat input minus the rate of heat loss from the box… due to conduction, radiation and convection (in this case none of the latter because the box is sealed).

The loss rate depends in the temperature difference and the thermal resistance. THicker and better insulation increases the resistance; larger area decreases the resistance. Eventually the heat (temperature) will rise and the difference between inside and outside will be so large that the temperature will rise no more. But in the case of a 1800 W hairdryer the temperature will exceed the melting point of plastics and wire insulation and if allowed to come to heat equilibrium will probably short out and catch fire or blow an external fuse.

Most modern hair dryers have a internal thermal fuse that cuts out at temperatures below the melting point and probably this will cut off the dryer before catastrophic meltdown. Its a one time fuse and not readily available, mostly you toss the dryer when the fuse goes

Answer:

If the frequency of a wave is doubled, what happens to its wavelength? If the frequency is doubled, the wavelength is only half as long. 3. ... As the frequency slows down, the wavelength increases.

Explanation:

Answer:

Reaction rate are not sensitive to temperature.

Answer:

Explanation:

1/v - 1/u = 1/f

given, f = 0.3 m, u = -0.4m

so, 1/v - 1/-0.4 = 1/0.3

or, 1/v = 1/0.3 - 1/0.4 = 1/1.2

v = 1.2 m

now, differentiating 1/v - 1/u = 1/f with respect to t,

-1/v² dv/dt + 1/u² du/dt = 0

or, dv/dt = (v/u)² du/dt

putting, du/dt = 0.01 m/s , v = 1.2 m and u = -0.4 m

so, dv/dt = (1.2/-0.4)² × 0.01

= 0.09 m/s

hence, speed of image with respect to lens is 0.09 m/s .

from formula of magnification

magnification, m = v/u

differentiating with respect to time both sides,

dm/dt = (u dv/dt - vdu/dt)/u²

= (-0.4 × 0.09 - 1.2 × 0.01)/(-0.4)²

= (-0.036 - 0.012)/0.16

= -0.048/0.16

= -0.3 m/s

hence, magnitude of rate of change of lateral magnification is 0.3 m/s

Answer: 588 N

Explanation: pressure = force/area, or p = F/A. Then p1=p2

And F1//A1 = F2/A2 . F2 = F1·A2/A1 = 11760 N·0.0125 m²/ 0.25 m²

Answer:

F = 160.0 N

Explanation:

Given: Soccer payer with a mass = 80 kg, force = 20 N

To find: force

Formula: [tex]F=ma[/tex]

Solution: It is summarized by the equation: Force (N) = mass (kg) × acceleration (m/s²). Thus, an object of constant mass accelerates in proportion to the force applied.

F = m × a

F = 20 kg - 10 = 2  

F = 80 × 2 = 160

F = 160.0 N

Newtons are derived units, equal to 1 kg-m/s². In other words, a single Newton is equal to the force needed to accelerate one kilogram one meter per second squared.

Answer:

Aerobic exercise is an important component of a healthy lifestyle. Find out more about aerobic equipment that can help keep you fit.

Aerobic equipment simulates the movements of aerobic exercises such as walking, jogging, rowing, skiing, hiking, biking, and climbing. These activities rhythmically and continuously move your large muscles — the key to getting your heart beating fast enough and long enough for aerobic conditioning.

The devices don't "draw" 120v. The 120v comes to your house from the power company. They decide it should be 120v and that's what they send you. It's hypothetically technically possible for you to change that, but if you try it, you'll definitely burn the house down.

The total resistance of those two devices in parallel is 6 and 2/3 ohms. That doesn't depend on what they're plugged into. It would still be 6 and 2/3 ohms if they were connected in parallel, wrapped in tissue, sealed in a jar of chicken soup and stored in a box on a high shelf.

But since they ARE plugged into 120v, they draw 18 Amperes from the socket, and they turn all of that electrical energy into 2160 watts of heat. That's about the same as a good size toaster oven, and you have to figure out a way to get rid of all that heat before you burn the house down.

Answer:

The answer is B.

Explanation:

مافيني اشرح

Answer with explanation: