if relative density is equal to 1 then the substance would sink in water ..true or false​

The moment of forces in a valve equals force multiplied by the perpendicular distance to the pivot.

This can be defined as an action which changes the motion of an object. A valve is fixed to a pivot and opens and closes thereby controlling flow of fluid.

The moment of forces in a valve is the force multiplied by the perpendicular distance to the pivot.

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Answer:

Physics helps you to understand the world around you, and satisfy your curiosity. It develops your critical thinking and problem-solving skills.

Answer:

Going with the current. You every watch Finding Nemo and the turtle guy says " Going with the waves bro"

Explanation:

Answer:

Young sea turtles make a concerted effort to swim in particular directions, instead of drifting with ocean currents.

A. Going with the current.

With no friction, block 1 would be pulled to the edge of the table as block 2 falls. By Newton's second law, the net horizontal force on block 1 is

∑ F[1, h] = T = (2 kg) a

where T = magnitude of tension and a = acceleration of the blocks, while the net force on block 2 is

∑ F[2] = (3 kg) g - T = (3 kg) a

where (3 kg) g = weight of block 2 and g = 9.8 m/s². Notice that we take the downward fall of block 2 to be the positive direction.

Eliminate T and solve for a :

T + ((3 kg) g - T) = (2 kg) a + (3 kg) a

(3 kg) g = (5 kg) a

a = 3g/5

Solve for T :

T = (2 kg) (3g/5) = 6g/5 kg = 11.76 N

Now, taking friction into account, block 1 would have net force

∑ F[1, h] = T - sf = 0

so that the maximum magnitude of static friction is sf = 11.76 N. The net vertical force on block 1 is

∑ F[1, v] = n - (2 kg) g = 0

where n = magnitude of the normal force. Let µ be the coefficient of static friction. It follows that

n = (2 kg) g = 19.6 N

sf = µ n   ⇒   µ = (11.76 N) / (19.6 N) = 0.6

The voltage of the power source flowing through the given wire is determined as 2.67 x 10⁻⁵ V.

The voltage of the power source is determined from ohm's law as shown below;

V = IR

where;

But, I = Q/t

V = (Q/t)R

[tex]V = \frac{QR}{t} \\\\V = \frac{(1\times 10^{15} \times 1.602\times 10^{-19} \ C) \times \ 10 \ ohms}{1 \times 60\ s} \\\\V = 2.67 \times 10^{-5} \ V[/tex]

Thus, the voltage of the power source flowing through the given wire is determined as 2.67 x 10⁻⁵ V.

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Answer:

.

Explanation:

For an electron is in the ground state of an infinite square well, the wavelength of electromagnetic radiation and the width of the square well  is mathematically given as

Generally, the equation for the  wavelength is mathematically given as

[tex]\lambda=\frac{hc}{24e}[/tex]

Therefore

\lambda=1240/12.24ev

\lambda=67.96nm

In conclusion, the width of the square well

[tex]a^2=\frac{\pi^2*h^2}{2me}[/tex]

Therefore

[tex]a^2=\frac{9.85*1.10*10^-68}{18.2*10^31*1,21*10^{19}}[/tex]

a^2=0.492*10^18

a=0.7nm

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Answer:

λ=898.5nm

Explanation:

a)

ΔE=hc/λ

ΔE=[tex]E_{2} -E_{1}\\[/tex]

[tex]E_{2} =E_{1} *(n^{2} )[/tex]

Where n equals the new energy level (in this case 2)

so ΔE=(0.46)*4-0.46 = 1.38eV

λ=hc/ΔE

λ=1240nm eV/1.38eV

λ=898.5nm

The effective resistance of the car radio drawing in the given amount of current is 42.86Ω.

Ohm's law states that "the voltage between two points is directly proportional to the current flowing through the resistance.

It is expressed as;

V = IR

Where V is voltage, I is current and R is resistance.

Given the data in the question;

To determine the effective resistance of the car radio, we substitute our given values into the expression above.

V = IR

12V = 0.28A × R

R = 12V ÷ 0.28A

R = 42.86Ω

Therefore, the effective resistance of the car radio drawing in the given amount of current is 42.86Ω.

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For a single slit illuminated with a 500 nm light gives a diffraction pattern on a far screen,the angle  is mathematically given as

theta=25.3

Option A is correct

Generally, the equation for the the angle   is mathematically given as

[tex]\theta=n(\lambda/d)[/tex]

Therefore

[tex]\theta 1/ \theta 2=n1(\lambda/d)/ n2(\lambda/d)[/tex]

In conclusion

theta/7=16/5

theta=10*7/5

theta=25.3

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Answer:

The answer must be B

Explanation:

Because the hot soup increases the temperature of the room it also increased the temprature of the ice water and because whatever surroundings the soup and the ice is in it transfers heat energy to the room and because most of the energy is lost in the room it eventually becomes the same tempature.

Unlimited, clean energy plant describes the renewability of utility-scale wind energy.

Utility-scale wind turbines are installed in large, multi-turbine wind farms connected to the nation's transmission system. These turbines produce clean and unlimited energy.

So we can conclude that Unlimited, clean energy plant describes the renewability of utility-scale wind energy.

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Answer:

Answer 3

Explanation:

I took the test

Answer:

I think that it is called speed

Explanation:

Answer:

speed

Explanation:

The rate of change of POSITION is speed

The rate of change of SPEED is acceleration

Answer:

The direction of the field is downward, and negatively charged particles will experience an upwards force due to the field.

F = N e E     where E is the value of the field and N e the charge Q

M g = N e E      and M g is the weight of the drop

N = M g / (e E)

N = 1.1E-4 * 9.8 / (1.6E-19 * 370) = 1.1 * 9.8 / (1.6 * 370) * E15 = 1.82E13

.00011 kg is a very large drop

Q = N e = M g / E = .00011 * 9.8 / 370 = 2.91E-6 Coulombs

Check:     N = Q / e = 2.91E-6 / 1.6E-19 = 1.82E13   electrons

Answer:

Explanation:

10. As a spaceship is moving toward Earth, an Earthling measures its length to be 325 m, while the captain on board radios that her spaceship's length is 1150 m. (c = 3.00 × 108 m/s) (a) How fast is the rocket moving relative to Earth? (b) What is the TOTAL energy of a 75.0-kg crewman as measured by (i) the captain in the rocket and (ii) the Earthling?

Answer:

The answer is C

Explanation:

Answer:

A magnet is a material or object that produces a magnetic field. This magnetic field is invisible but is responsible for the most notable property of a magnet: a force that pulls on other ferromagnetic materials.

Answer:

The door's moment of inertia for rotation about a vertical axis inside the door, 14 cm from one edge is 4.205 kgm².

The door's moment of inertia for rotation about a vertical axis inside the door, 14 cm from one edge is calculated as follows;

[tex]I = I_{cm} + Md^2[/tex]

where;

[tex]d = \frac{L}{2} - 0.14\\\\d = \frac{0.91}{2} - 0.14\\\\d = 0.315 \ m[/tex]

[tex]I = \frac{1}{12} ML^2 + Md^2\\\\I = \frac{1}{12} (25)(0.91)^2 \ + \ (25)(0.315)^2\\\\I = 1.725 \ + \ 2.48\\\\I = 4.205 \ kgm^2[/tex]

Thus, the door's moment of inertia for rotation about a vertical axis inside the door, 14 cm from one edge is 4.205 kgm².

The complete question is below;

A 25kg solid door is 220 cm tall, 91 cm wide. What is the door's moment of inertia for rotation about a vertical axis inside the degr,  14 cm from one edge.

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Explanation:

v = s/t

20 = s/5

100 = s

s = 100 = 1 × 10².

When a cyclist bikes with an average velocity of 20 m/s for 5 seconds, the magnitude of the cyclist displacement would be 1×10² meters.

The total displacement covered by any object per unit of time is known as velocity. It depends on the magnitude as well as the direction of the moving object. The unit of velocity is meter/second. It can also be represented by the infinitesimal rate of change of displacement with respect to time. The generally considered unit for velocity is a meter per second.

The mathematical expression for velocity is given by the formula

velocity= total displacement/Total time

The area under the velocity-time graph represents the total displacement covered by the object while the slope of the velocity time graph represents the acceleration of the object.

For the given problem when a cyclist bikes with an average velocity of 20 m/s for 5 seconds,

Displacement =velocity×time

                       =20×5

                       =1×10²

The magnitude of the cyclist's displacement is 1×10²

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Answer:

About 7.67 m/s.

Explanation:

Mechanical energy is always conserved. Hence:

[tex]\displaystyle \begin{aligned} E_i & = E_f \\ \\ U_i + K_i &= U_f + K_f\end{aligned}[/tex]

Where U is potential energy and K is kinetic energy.

Let the bottom of the slide be where potential energy equals zero. As a result, the final potential energy is zero. Additionally, because the child starts from rest, the initial kinetic energy is zero. Thus:

[tex]\displaystyle U_i = K_f[/tex]

Substitute and solve for final velocity:
[tex]\displaystyle \begin{aligned} mgh_i &= \frac{1}{2}mv_f^2 \\ \\ 2gh_i &= v^2_f \\ \\ v_f &= \sqrt{2gh_i} \\ \\ & =\sqrt{2(9.8\text{ m/s$^2$})(3.00\text{ m})} \\ \\ & \approx 7.67\text{ m/s} \end{aligned}[/tex]

In conclusion, the child's speed at the bottom of the slide is about 7.67 m/s.

Answer:

See below

Explanation:

Wavelength is distance between  consecutive wave crests or consecutive  troughs

 in this situation when one boat is at crest the other is in the trough...

    the wavelength will be twice this distance between the boats

           WL = 2 * 18 = 36 meters

amplitude is (distance from bottom to top) divided by two

    ampl = 2.6/2 = 1.3 m    (this is the same as the distance from the midline of the wave to the top of the wave)

5 cycles in 10 seconds  ...the frequency is in Hz ...which is cycles per second ,  so the frequency = 5 cycles/ 10 seconds = .5 Hz

 Period is = 1/f = 1/.5 Hz = 2 seconds per cycle

Answer:

94,800 m

Explanation:

F = kq1 q2/r^2

1 = 9 x 10^9 x 1 / r^2

Answer:

The steps involved in the scientific method are;

•Draw up a research question

•Construct a hypothesis

•Test the hypothesis through experiments

•Analyse experimental results

•Draw conclusions

Science is a study of the universe from an empirical point of view. This means that scientific investigations depend onexperiments.

The first step in the scientific method of investigation is to draw up the research questions to be investigated. After this is done, subjected to experiments. The experiments may confirm or disprove the hypothesis. If the hypothesis is disproved, then it is revised in line with the results of experiments.

a research hypothesis is constructed and

Answer:

Quarks

Quarks are among the smallest particles in the universe, and they carry only fractional electric charges. Scientists have a good idea of how quarks make up hadrons, but the properties of individual quarks have been difficult to tease out because they can't be observed outside of their respective hadrons.

Answer:

Quarks

Quarks are among the smallest particles in the universe, and they carry only fractional electric charges. Scientists have a good idea of how quarks make up hadrons, but the properties of individual quarks have been difficult to tease out because they can't be observed outside of their respective hadrons.

Hi there!

Recall the equation for an LR circuit time-constant:
[tex]\tau = \frac{L}{R}[/tex]

L = Inductance (H)

R = Resistance (Ω)

Plug in the given values.

[tex]\tau = \frac{0.005}{1000} = 0.000005 s = \boxed{\text{5 } \mu s}[/tex]

Answer:

534 j

Explanation:

100 lbs = 45.359 kg

work = F * d

         = 45.359 * 9.81  * 1.2 = ~ 534 j

The work done is the dot product of force and displacement. 100 lbs is 45.3 kg in weight. The work done on this weight to make a displacement of 1.2 m is 532.728  J.

Work done in physics is the dot product of  force and displacement. Force exerted on an object if results in displacement, it is said to be work  done on the object. Work done is a vector quantity, thus, both magnitude and direction.

Not any force results in work done. Work is done only if there occurs a displacement. It is given that the weight of object moved is 100 lbs.

1 lbs. = 0.453 kg

thus, 100 lbs. = 45.3 Kg.

Force F = mg

             = 45.3 Kg × 9.8 m/s²

             = 443.94 N

This is the force by its own weight.

Work done = Force × displacement.

                   =  443.94 N × 1.2 m

                   = 532.728  J

Therefore, the work done to move the weight is 532.72 J.

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Answer:

The principle of simple machine states that "if there is no friction in a simple machine, work output and work input are found equal in that machine.

Explanation:

Answer:

Usually, the term refers to the six classical simple machines which were defined by Renaissance scientists:

Also, a simple machine uses a single applied force to do work against a single load force.

The slope obtained using the above information is acceleration and the magnitude of the acceleration is determined as 0.21 m/s².

The slope of velocity time graph is known as acceleration. Acceleration is the rate of change of velocity with time.

a = Δv/Δt

where;

Δv = vf - vi

Δv = 2.35 - 0.4

Δv = 1.95 m/s

Δt = t2 - t1

Δt = 10 - 0.5

Δt = 9.5 s

a = Δv/Δt

a = (1.95) / (9.5)

a = 0.21 m/s²

Thus, the slope obtained using the above information is acceleration and the magnitude of the acceleration is determined as 0.21 m/s².

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Answer:

2 pi R / T =     speed of moon

m V^2 / R = G M m / R^2        centripetal force = gravitational force

V^2 / R = G M / R^2

4 pi^2 R^2 / (T^2 R) = G M / R^2     using first equation

R^3 = 1 / (4 pi^2) * G M T^2        we need to know G and M

R^3 = .0253 * 6.67E-11 * 5.98E24 T^2 = 1.01E13 * T^2

63.3 da = 5.47E6 sec

T^2 = 2.99E13 sec^2

R^3 = 1.01E13 * 2.99E13 = 3.02E26 = 302E24 m^3

R = 6.70E8 m from center of earth

Using 1609 m/mile

R = 416,000 miles

Note: our moon is about 239,00 miles away

So this distance is about 1.74 our earth-moon distance

If T^2 proportional R^3    (the moon period is 27.3 da)

63.3/27.3 = 2.32         2.32^2 = 5.38

416/239 = 1.74              1.74^3 = 5.27

Not exact but reasonably close

Answer:

The third line of defense is immune cells that target specific antigens. The immune cells that play a role in the third line of defense are B-cells and T-cells, both are white blood cells. The B-cells produce antibodies. The T-cells help identify pathogenic cells and destroy targeted cells.

Answer:

17.15 N

Explanation:

Remember   F = m a

                       = 7 kg * 2.45 m/s^2 = 17.15 N