When a drawing is shown at 1/8 ′=1 ′−0 " scale, that means: If something measures 1/8" on the drawing, it is 10 feet long in reality. The entire drawing is equal to or less than 1/8 " square. If something measures 1" on the drawing, it is 8'-0" long in reality. If something measures 1" on the drawing, it is 1/8 " long in reality.

Answer:

1.In dry cells, manganese dioxide acts as a ‘depolariser'.

In the depolarization process, the depolariser is used to remove hydrogen and doesn't allow the voltage to get reduced due to polarisation of the cell . Manganese oxide was used as a depolariser in Leclanché cell .

In zinc-carbon dry cell, the manganese dioxide takes in electrons as it is converted to Manganese III oxide (Mn2O3)

2.The fuse breaks the circuit if a fault in an appliance causes too much current flow. This protects the wiring and the appliance if something goes wrong. The fuse contains a piece of wire that melts easily. If the current going through the fuse is too great, the wire heats up until it melts and breaks the circuit.

Answer: Animals are used in many different kinds of experiments. These are just a few examples and alternatives to using animals in experiments.

Explanation:

Answer:

It allows people in different places and different countries to use the same units, avoid mistakes and understand each other more easily. The common base 10 of all units makes it easier and has more accurate calculations that are made without cumbersome conversion factors.

Answer:

Explanation:

As we know that the SI units are extended versions of the MSK system. SI system helps us to calculate the appropriate measurement of any quantity. SI system is convenient(easy) to use and it is also followed all over the world which can help in international trade as well. So, SI system been developed.

Answer:

No

Explanation:

There are many units that are used to measure length of an object. For example centimeters, meters, millimeters etc.

There is a relationship between any of two units to measure lengths. If we want to convert some length from cm to m, it can be done as follows :

1 cm = 0.01 m

or

1 m = 100 cm

When we use this conversion, the calculation remains the same. Only the way to represent it will be different.

Hence, there is no lose of information when converted from centimeters to meters.

Answer:

Both physical and chemical changes

Answer:

Both physical and chemical changes follow the law since when the system is closed to all transfers of matter and energy, the mass of the system must remain constant over time, irrespective of the state.

Explanation:

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If you had a sugar cube that was made of white dwarf matter, it would weigh about as much as an elephant.

White dwarfs are the smallest type of stars in the universe, and they have a density of around 100 million times greater than that of water. This means that if you took a sugar cube that was made entirely out of white dwarf matter and put it on your kitchen counter, it would weigh about as much as an elephant!

But don't worry—you're not going to find any white dwarfs at your local grocery store or restaurant. White dwarfs are formed when red giants collapse in on themselves after burning through their fuel. And if you did happen to find one, you'd need a really big countertop.

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When an aluminum rod is placed in the middle of an inductor, the resonance frequency of the LRC circuit should: decrease

The inductance of an inductor depends on its physical dimensions and the material it is made of. Placing an aluminum rod in the middle of an inductor changes its effective inductance due to the presence of the conductive material. Since the effective inductance is reduced, the resonance frequency of the LRC circuit is decreased. This is because the resonance frequency depends on the values of the inductance, capacitance, and resistance in the circuit, and a decrease in inductance results in a decrease in the resonance frequency. This effect can be utilized in various applications, such as in proximity sensors and metal detectors.

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Answer:

the reflection of the candle in the concave mirror formed upside down real image that is diminished

Solve for the linear/tangential speed:

a = v²/r

where a = centripetal acceleration, v = speed, and r = radius.

4.7 m/s² = v²/(0.3 m)

v² = (0.3 m) (4.7 m/s²)

v ≈ 3.96 m/s

For every time the record completes one revolution, a fixed point on the edge of the record travels a distance equal to its circumference, which is 2π (0.3 m) ≈ 1.88 m. So if 1 rev ≈ 1.88 m, then the angular speed of the record is

(3.96 m/s) (1/1.88 rev/m) ≈ 7.46 rev/s

Take the reciprocal of this to get the period:

1 / (7.46 rev/s) ≈ 0.134 s/rev

So it takes the record about 0.134 seconds to complete one revolution.

Answer:

0.36cm

Explanation:

Given parameters:

Output distance  = 2.0cm

M.A = 5.5

Unknown:

Input distance = ?

Solution:

The mechanical advantage is the value of the force multiplier.

   M.A = Output distance /  Input distance

Input distance  =  Output distance / mechanical advantage

Input distance = \(\frac{2.0cm}{5.5}\)   = 0.36cm

Spin is an intrinsic property of electron. This is useful to find comprehensive details about the electron in atom, such as, energy perturbation, angular momentum etc.

The term "spin quantum number" refers to the fourth quantum number that is presented to characterize the orientation of the electron spin (rotation) in space. It can move either clockwise or counterclockwise.

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Answer:

\(a = 7.69\: {m(s)}^{ - 2} \)

Explanation:

\(f = ma \\ a = \frac{f}{m} = \frac{500}{65} = \frac{100}{13} \\ a = 7.6923076923 \: {m(s)}^{ - 2} \)

The question relies on conservation of energy

2 Energy equations:

Kinetic Energy = 1/2mv^2

Gravitational potential energy = mgh

Initial energy = final energy

1/2m(v0)^2 = mgh + 1/2m(vf)^2

Divide mass out to save time

1/2(v0)^2 = gh + 1/2(vf)^2

PLug in what we know:

v0 = 39 m/s

h = 21 meters

1/2(39)^2 = 9.8(21) + 1/2(vf)^2

1/2(39)^2 - 9.8(21) = 1/2(vf)^2

554.7 = 1/2(vf)^2

1109.4 = (vf)^2

vf = 33.3076 m/s

Answer:

.1 seconds per meter

Explanation:

I am going to assume they are asking for the average time per 1 meter.

Because it took 10.23 seconds to run 100 meters, we are going to divide 10.23 by 100. This number will be the time per 1 meter.

To divide by 100, we will move the decimal point over by two. That will give us .1023 seconds.

The question asks to round to the nearest tenth, so we round it to .1 seconds.

*Just some trivia: Danie van Blerk does in fact have a time of 10.23 seconds. He has the 1073rd best 100 meter dash time. First place, Usain Bolt, has a time of 9.58 seconds.

Answer:

KE = 10530 J or 10.53 KJ

Explanation:

The formula for kinetic energy is KE = 1/2 mv^2

Let's apply the formula:

KE = 1/2 mv^2

KE = 1/2 (65kg) (18m/s)^2

KE = 10530 J or 10.53 KJ

The numerical value of the intensity (I) in watts per square meter is given by:

I = (1/2) * (E0^2 / (µ0 * c))

a. The direction of the magnetic field can be determined using the right-hand rule. According to the right-hand rule, if the electric field is in the y-direction (Ey), then the magnetic field (B) will be in the z-direction. This means the magnetic field is perpendicular to both the electric field and the direction of propagation (x-direction).

b. The relationship between the electric field (E) and the magnetic field (B) in an electromagnetic wave is given by the equation: B = E/c, where c is the speed of light in vacuum.

From the given information, we have E0 = 165 N/C as the amplitude of the electric field. Therefore, the amplitude of the magnetic field (B0) can be expressed as:

B0 = E0 / c

c. The intensity of an electromagnetic wave (I) is related to the amplitude of the electric field (E0), the speed of light (c), and the permeability of free space (µ0) by the equation:

I = (1/2) * ε0 * c * E0^2

However, in the given question, it mentions the permeability of free space (µ0) instead of the electric constant (ε0). The electric constant is related to the permeability of free space by the equation: ε0 = 1 / (µ0 * c^2).

Substituting the value of ε0, the intensity (I) can be expressed as:

I = (1/2) * (1 / (µ0 * c^2)) * c * E0^2

I = (1/2) * (E0^2 / (µ0 * c))

d. To solve for the numerical value of the intensity (I) in watts per square meter, we need the value of the permeability of free space (µ0). The permeability of free space is approximately 4π × 10^-7 T·m/A.

Substituting the value of µ0 into the equation, we can calculate the numerical value of I.

To obtain the numerical value, substitute the known values:

µ0 ≈ 4π × 10^-7 T·m/A

c ≈ 3.0 × 10^8 m/s

E0 = 165 N/C

Substituting these values into the equation, we have:

I = (1/2) * (165^2 / (4π × 10^-7 * (3.0 × 10^8)^2))

Simplifying the equation and evaluating it will give the numerical value of I in watts per square meter.

Please note that due to the complex calculations involved, it is recommended to use a calculator or a software program to obtain the precise numerical value of I.

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The average specific heat capacity of the liquid in this temperature is 2506 J/kg/C

The specific heat capacity, or massic heat capacity, of a substance is calculated using thermodynamics as the heat capacity of a sample of the substance divided by the mass of the sample.A substance's specific heat capacity may be substantially higher when heated in an open vessel that permits expansion than when heated in a closed vessel that prevents expansion, especially when the substance is a gas (specific heat capacity at constant pressure) (specific heat capacity at constant volume).

the amount of heat input to the liquid is 65W x 120s = 65(J/s) x 120s = 7800J

then we have that

Q = \(m\times c \times \delta t\) so that

c = (\(\frac{Q}{m\times\delta t}\)) = \(\frac{7800J}{0.78kg * 3.99C}\) = 2506 J/kg/C

if some of the energy heated the container or surroundings, then less energy actually went into heating the liquid; if less energy caused the 3.99C temp increase, the specific heat must be less, so the value we just calculated is an overestimate.

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The tension in the cord is equal to centripetal force which is 32 newton.

We need to know about centripetal force to solve this problem. When an object moves in a circular motion, the object is experiencing centripetal force. The magnitude of centripetal force is

Fc = m . v²/R

where Fc is the centripetal force, m is mass, v is velocity and R is the radius.

From the question, we know that

m = 2 kg

v = 4 m/s

R = 1 m

The tension in the cord is equal to centripetal force

T = Fc

T = m . v²/R

T = 2 . 4² / 1

T = 32 N

Hence, the tension in the cord is 32 newton.

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Answer:

2 g / cm^3

Explanation:

Density = mass / volume

              = 4 g / 2 cm^3   = 2 g / cm^3

The scaled diameters of the missing planets are listed below:

Mercury                      1.4 cm

Venus                        3.3 cm

Mars                           1.9 cm

Jupiter                     39.2 cm

Saturn                      33.1 cm

Uranus                     14.0 cm

Neptune                  13.6 cm

In this question we must use conversion factor to calculate the scaled diameters by means of the following direct relationship:

d = k · D     (1)

Where:

The conversion factor is found by using the real and scaled diameter of the Earth:

k = 3.5 cm/12,756 km

k = 7/25512 cm/km

Then, we determine the scaled diameters of the rest of planets:

Mercury                      1.4 cm

Venus                        3.3 cm

Mars                           1.9 cm

Jupiter                     39.2 cm

Saturn                      33.1 cm

Uranus                     14.0 cm

Neptune                  13.6 cm

The statement reports a table with numerous mistakes, the correct table is shown below:

Planet               Diameter (km)             Scaled Diameter (cm)

Mercury                  4,879

Venus                    12,104

Earth                      12,756                                    3.5

Mars                        6,792                                    

Jupiter                 142,984

Saturn                120,536

Uranus                    51,118

Neptune               49,528

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Answer:

When dealing with the force of gravity between two objects, there are only two things that are important – mass, and distance. The force of gravity depends directly upon the masses of the two objects, and inversely on the square of the distance between them

From the principle of energy conservation, the kinetic energy of the pendulum at 0.5 m is 14.7 J.

A pendulum swings back and forth and can be used to show the change of potential energy to kinetic energy and vice versa.

Given that the kinetic energy is converted to the potential energy; the potential energy at 0.5 m is 3 * 9.8 * 0.5 = 14.7 J.

Following the principle of energy conservation, the kinetic energy of the pendulum at 0.5 m is 14.7 J.

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If one of the magnets is put into assembly backward, it will reverse the magnetic polarity of the assembly.

What is magnetic polarity?

The direction in which the magnetic field lines travel is referred to as magnetic polarity. When a magnet is divided in half, each piece retains its magnetic polarity, with north on one side and south on the other. The magnetic pole refers to the location on the magnet's surface where the magnetic field is at its strongest.

Different poles of a magnet:

Magnetic north and south poles are found on opposite ends of a magnet. When two magnets are brought near each other, opposite poles attract, and like poles repel. When two opposite poles are brought together, the magnetic fields are drawn together, increasing the magnetic field strength. When two like poles are brought together, the magnetic fields are pushed away from each other, decreasing the magnetic field strength.

What happens when one of the magnets is put assembly backward?

If one of the magnets in an assembly is reversed, it will reverse the magnetic polarity of the entire assembly, causing the magnetic fields of the magnets to repel rather than attract each other. If you try to connect the two ends of the assembly, the magnets will push each other away rather than attract each other. The strength of the magnetic field will also be diminished, causing the assembly to have less magnetism.

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The correct answer is option D.2 years

According to Kepler's Third Law of Planetary Motion, T² is proportional to r³, where T is the period of revolution of the planet and r is the distance between the planet and the star.

In order to solve for T,  

AU = 1

Astronomical Unit = the average distance between the Earth and the Sun = 149.6 million kilometres

Therefore, the planet is orbiting at a distance of 149.6 million kilometres from the star.

Substituting the values of r and solving for

T².T² ∝ r³T² ∝ (149.6)³T²

= (149.6)³T²

= 3.522 x 10¹²T

= √3.522 x 10^¹²T

= 1.87 x 10⁶ seconds

T = 31,100 minutes

T = 518 hours

T = 21.6 days

T = 2 years

Therefore, the orbital period of the planet with twice the mass of Earth orbiting at a distance of 1 AU from a star with the same mass as the Sun is 2 years.

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If the glider oscillates back and forth on the air-track, at what point in the motion is the acceleration zero when the glider reaches the extreme points of its motion, i.e., at the endpoints of the oscillation.

In the motion of a glider oscillating back and forth on an air-track, the acceleration is zero when the glider reaches the extreme points of its motion, i.e., at the endpoints of the oscillation. These points are called the turning points or the points of maximum displacement.

On the other hand, the velocity is maximum at the center of the motion, which is the midpoint between the two turning points. At this point, the glider changes its direction of motion and its velocity reaches its maximum value.

Here's a simplified diagram illustrating the motion of the glider:

  |       |

  |       |

  |       |

  |       |

  |       |

---+-------+---

Turning  Turning

Point    Point

At the turning points, the acceleration is zero (the glider momentarily stops before changing its direction), while at the midpoint between the turning points, the velocity is maximum (the glider is moving at its highest speed).

Note that this diagram represents a one-dimensional motion, where the glider moves back and forth along a straight line. In reality, the glider's motion may involve more complex trajectories, but the concept of acceleration being zero at the turning points and maximum velocity at the midpoint still holds true.

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Answer: C

A Systematic error occurs when there is a problem with the instrument , so the answer should be c .

Explanation:

Answer:

A Systematic Error Occurs When There Is A Problem With The Instrument, so The Answer Is C

Explanation:

Answer: b. The United States Constitution

Explanation:

Montesquieu argued that the best form of government, was one where the legislative arm, executive arm, and judicial powers were separate. and in doing so helped kept each other in check to prevent any branch from becoming too powerful. Montesquieu’s separation of powers was not accurate when compared the government of England, But this was later adopted by Americans as the foundation of the U.S. Constitution.