Three components of vector A and vector B are:

Ax = +7.6 Bx = −15.2
Ay = -9.2 By = ?

If vector B is a scalar multiple of vector A , what are the possible values of By ?


A. 18.4 only

B. all non-zero decimals

C. all positive decimals

D. all decimals greather than 9.2

Solid sphere is the correct answer.

Answer:

D) A Solid Sphere

Explanation:

As per Dalton's atomic description he said that atom is not divisible and that is the smallest part of atom.

It has no net charge and it can not be divided further. So till Dalton's theory of atom electron and nucleons were not discovered.

So we can consider atom as a model of Solid sphere  because similar to a solid sphere the atom is considered to be unique and not destructible.

So here correct answer will be

D) A Solid Sphere

Answer:

    Magnitude of the force exerted by the heart muscle  = 0.03 N

Explanation:

  We have force = mass * acceleration

   Acceleration = Rate of change of velocity = Change in velocity/time = (0.32-0.20)/0.08

                          = 0.12/0.08 = 12/8 = 1.5 [tex]m/s^2[/tex]

   Mass of blood = 20 g = 20/1000 kg = 0.02 kg

   Magnitude of the force exerted by heart muscle = 0.02*1.5 = 0.03 N

The magnitude of the force exerted by the heart muscle is 0.03 N.

From Newton's second law, we know that F = ma

Where;

F = force

m = mass of the body

a = acceleration

Now we must find the acceleration from:

a = v - u/t

a = acceleration

v = final velocity

u = initial veocity

t = time taken

Substituting values;

a = 0.32 m/s -  0.20 m/s/ 0.08 s

a = 1.5 m/s^2

Since F = ma

But m was given in grams and we must convert to kilograms so m = 0.002 Kg

Therefore;

F = 0.002 Kg × 1.5 m/s^2

F = 0.03 N

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They have equal magnitudes and opposite directions.

Answer:

The magnitude of both velocities will be same but direction will be opposite.

Explanation:

Distance on Homestretch = d1 = 100 m

Distance on backstretch = d2 = 100 m

Time = t = 12.2 s

Magnitude of velocity on Homestretch = V1 = d1/t = 100/12.2 = 8.196 m/s

Magnitude of velocity on backstretch = V2 = d2/t = 100/12.2 = 8.196 m/s  

if we look at the racecourse, we will come to know that runner runs on homestretch and backstretch in opposite direction. Hence, magnitude of velocities will be same but direction will be opposite.  

The average velocity for the entire curve on a position-time graph can be found by calculating the slope between the initial and final points. In this case, the average velocity is -4 m/s.

The correct answer would be Option A: -4 m/s.

To find the average velocity for the entire curve on a position-time graph, you can calculate the slope of the line connecting the initial and final points on the graph.

In this case, it looks like the curve has a downward slope, so the average velocity would be negative. Based on the given answer options, the correct answer would be Option A: -4 m/s.

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Here current is flowing through the copper wire so this shows that copper is good conductor of electricity.

It is having less resistance as it conducts the current easily

Now a rubber coating on it will protect us from electric shock

So this property shows that rubber is a bad conductor of electricity

It is having large electrical resistance due to which it will conduct no current

Rubber : - No transmittance of electricity

copper :- good transmittance of electricity

Copper is a good conductor of electricity due to its low electrical resistance, while rubber is an insulator that prevents the flow of electric charge. The copper portion of the cable carries the electrical current while the rubber surrounds and isolates it.

Copper wire is a good conductor of electricity because it has a low electrical resistance, allowing electric charge to flow easily through it. This is due to the physical property of copper called low resistivity. On the other hand, rubber is an insulator and does not allow electric charge to flow through it easily due to its high resistivity. Rubber protects you from being zapped by electricity because it prevents the flow of electric charge, acting as a barrier. In a mini stereo speaker cable, the copper portion carries the electrical current while the rubber surrounds and isolates it.

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Answer:

a)  Acceleration = [tex]8.75m/s^2[/tex]

b) Slow down acceleration = 0.625[tex]m/s^2[/tex]

c) Car travels 9.8 m

Explanation:

  Acceleration = Change in velocity/Time

a) Change in velocity = 3.5-0 = 3.5 m/s

   Time = 0.4 seconds

    Acceleration = [tex]3.5/0.4=8.75m/s^2[/tex]

b) Change in velocity = 0 - 3.5 = -3.5 m/s

   Time = 5.6 seconds

   Acceleration = [tex]-3.5/5.6=-0.625m/s^2[/tex]

   Slow down acceleration = 0.625[tex]m/s^2[/tex]

c) We have equation of motion, [tex]v^2=u^2+2as[/tex], where u is the initial velocity, u is the final velocity, s is the displacement and a is the acceleration.

 Here v = 0 m/s, u = 3.5 m/s, a = -0.625[tex]m/s^2[/tex]

 Substituting

    [tex]0^2=3.5^2-2*0.625*s\\ \\ s=9.8m[/tex]

  So, car travels 9.8 m

Answer:

Number of carbon, hydrogen, and oxygen atoms in sugar:

Explanation:

1) Given balanced chemical equation:

2) Mass conservation law: in a chemical reaction, the atoms are not created nor destroyed; they recombine to form new substances, so the number of atoms of each kind in the reactants is equal to the number of atoms of the same kind in the products.

3) Balance.

-----------------------------------------------------------------------------------------------------

Atom          Products                    =            Reactants

-----------------------------------------------------------------------------------------------------

C                12CO₂ ⇒ 12               =             12 in sugar

-----------------------------------------------------------------------------------------------------

H               11H₂O ⇒ 11 × 2 = 22   =             22 in sugar

-----------------------------------------------------------------------------------------------------

O               12CO₂ ⇒ 12 × 2 = 24                12 × 2 = 24 in O₂ + x in sugar

                  11H₂O ⇒ 11

                 -----------------------------       --------------------------------------------------

                  24 + 11 = 35                =         24 + x

----------------------------------------------------------------------------------------------------

Solve for x: 35 = 24 + x ⇒  x = 35 - 24 = 11 ∴ 11 O atoms in sugar

Conclusion:

Number of carbon, hydrogen, and oxygen atoms in sugar:

Igneous Rocks are rocks that are made from magma (molten lava). The correct order of the Igneous Rock formation is ACBD.

These are the rocks made from magma (molten lava). The magma form in the upper mantle and lower crust because of very high temperature.

These rocks form,

Therefore, the correct order of the Igneous Rock formation is ACBD.

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Answer:

a)  Acceleration = [tex]8.75m/s^2[/tex]

b) Slow down acceleration = 0.625[tex]m/s^2[/tex]

c) Car travels 9.8 m

Explanation:

  Acceleration = Change in velocity/Time

a) Change in velocity = 3.5-0 = 3.5 m/s

   Time = 0.4 seconds

    Acceleration = [tex]3.5/0.4=8.75m/s^2[/tex]

b) Change in velocity = 0 - 3.5 = -3.5 m/s

   Time = 5.6 seconds

   Acceleration = [tex]-3.5/5.6=-0.625m/s^2[/tex]

   Slow down acceleration = 0.625[tex]m/s^2[/tex]

c) We have equation of motion, [tex]v^2=u^2+2as[/tex], where u is the initial velocity, u is the final velocity, s is the displacement and a is the acceleration.

 Here v = 0 m/s, u = 3.5 m/s, a = -0.625[tex]m/s^2[/tex]

 Substituting

    [tex]0^2=3.5^2-2*0.625*s\\ \\ s=9.8m[/tex]

  So, car travels 9.8 m

Final answer:

The bus's acceleration, calculated using the formula for acceleration (change in velocity over change in time), is 2 meters per second squared (2 m/s²).

Explanation:

To calculate the acceleration of a bus whose speed changes from 6 m/s to 12 m/s over a period of 3 seconds, we use the formula for acceleration (a), which is the change in velocity (Δv) divided by the change in time (Δt). The change in velocity is the final velocity minus the initial velocity. In this case, the final velocity (vf) is 12 m/s and the initial velocity (vi) is 6 m/s. Thus, Δv = vf - vi = 12 m/s - 6 m/s = 6 m/s. The change in time, Δt, is 3 seconds.

Now, we plug these values into the formula:

a = Δv / Δt = (12 m/s - 6 m/s) / 3 s

a = 6 m/s / 3 s

a = 2 m/s²

Therefore, the acceleration of the bus is 2 meters per second squared (2 m/s²).

9.  Force = mass * acceleration.

F = ma

(8) = (1)a

8m/s^2 = a

10.  First solve for the kinetic energy of the vehicle:

Kinetic energy = (1/2)mass * velocity^2

KE = (1/2)(1200)(2)^2

KE = 2400J

Now use this value in the equation for work:

Since the car comes to a halt, the work is equal to the kinetic energy.

Work = Force * Displacement

W = Fd

(2400) = F(0.15)  Remember to convert cm to m

1.6*10^4 N = F

9.

The 1N = 1kg * 1 m/s^2 has no influence on the answer.

F = 8 N

m = 1 kg

a = ??

F = m * a

8N = 1 kg * a

8N/1kg = a

a = 8 m/s^2

10

This is the beginning of a 2 step process. You are back to the basic 4 equations to find the acceleration. Then you can use F = ma

Givens

m = 1200 kg

vi = 2m/s

vf = 0

d = 15 cm = 0.15 m

Formula

F = m*a

vf^2 = vi^2 + 2 * a * d

0 = 2^2 + 2 * a * 0.15,

0 = 4 + 0.3 * a

- 4 = 0.3 * a

- 4 / 0.3 = a

- 13.3333333 = a

F = m * a

F = 1200 * (- 13.3333333)

F = - 16000 N

Comment (Extremely Important)

Why aren't any of the answers minus? It is because the minus represents the amount of force needed to stop the vehicle. But the question asks you about the rock. What is the rock experiencing? The rock is opposing the 0.15 m so the force it offers is in the opposite direction to that exerted by the vehicle.

The circuit component the symbol represents is: C) Battery

Explanation :

An electric circuit is a closed network consisting of an electrical component. It consists of a resistor, a battery, an ammeter, a voltmeter etc.

A symbol is given to every component.

The given symbol shows a battery. It consists of more than one cell and used as a power source in a circuit. It has two terminals i.e a positive terminal and a negative terminal.          

The positive terminal of a battery is a cathode and a negative terminal is an anode.    

Hence, the correct option is (C) " battery ".

A

This is a right triangle with legs 45 and 45 . Calculating the hypotenuse gives the distance from the starting point

let hypotenuse be h, then using Pythagoras' identity

h = √(45² + 45² ) = √4050 = 63.6396.. ≈ 64

The noble gasses, they are the elements on group 18 of the periodic table and do not usually form compounds. The noble gases are as follows: helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn), and oganesson (Og).

Hope this helped :)

The elements that do not ordinarily form compounds are the noble gases. These gases are found in Group 18 of the periodic table and include helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn).

Noble gases are extremely stable and inert, which means that under typical circumstances, they do not typically combine with other elements to produce compounds.

They are chemically stable because they have an entire outer electron shell. They are less likely to gain, lose, or share electrons with other atoms due to their entire outer electron shells, which is crucial for the formation of compounds.

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Answer:

trade winds

Explanation:

In tropics regions on the lower portion of earth's atmosphere the surface winds are observed in prevailing pattern. In northern hemisphere the trade wind predominantly blows from north east. In southern hemisphere it flows from south east. Subtropical high and the equator is in between these areas.

Thus, trade wind blow between the subtropical high and the equator.

Answer:

trade winds

Explanation:

True is your answer.

Hope this helps....

Answer:

True

Explanation:

Color is the splitting of light into different spectra. Light, by nature, is monochromatic. This means that it has one wave length. The prism experiment has proved that light has many colors. About 7 colors have been discovered.

The colors simply denote the different wavelengths of the "monochromatic" light. The colors are the different wavelengths of light when it is split.

The eye, sees color as a reflection. In the electron sense, color is as a result o electrons being "excited" or promoted from a lower orbital to a higher energy orbital.

Electromagnetic spectrum is the collection of electromagnetic waves arranged from low frequency electromagnetic waves to high frequency electromagnetic waves.

Electromagnetic waves are produced by electric charge that are accelerating. When a magnetic field combines with electric field electromagnetic waves are produced. The electric field and magnetic wave are perpendicular to one another in electromagnetic waves.

Below are the type of electromagnetic waves in electromagnetic spectrum: (from high frequency ---> low frequency)

Gamma rays - it is in the end of the electromagnetic spectrum, with highest frequency but shortest wavelength. Gamma rays are generated by radioactive substances.

X-rays - it is next to Gamma rays with respect to frequency but has longer wavelength.  This wavelength can penetrate metal. It was discovered by Wilhelm Conrad Roentgen in 1895.  

Ultraviolet -  ultraviolet waves or ultraviolet radiation have shorter wavelength compared to visible light. The main source of UV radiation is the sun.

Visible Light- among other electromagnetic waves, this the only electromagnetic wave that is visible to the naked eye. The waves inside the range of visible light are the colors. From red( longest wavelength inside visible light) to violet (shortest wavelength inside visible light).

Infrared - infrared radiation is beyond the red color on the visible length. Bodies on earth radiated infrared radiation.

Hope this helps, good luck.

Answer:

Radio waves.

Explanation:

Electromagnetic spectrum is an example of an electromagnetic waves which does not require material medium for its propagation. This electromagnetic spectrums are listed according to increase in their energy level i.e from Gamma ray to Radio waves

According to the their energy level, Gamma ray>X-ray>Ultraviolet rays>Visible light>Infrared rays>Radio waves.

This arrangement is also in terms of their increasing frequency and decreasing wavelength. This shows that radiowaves has the lowest energy level out of the electromagnetic spectrum

From that particular list:

Mica (A), Quartz (B), and Copper (D) are minerals.

Steam (C) isn't.

a falling rain drop may be an example.

Answer:

When a ball is dropped from some height from rest then while its motion under gravity its initial gravitational potential energy converts into kinetic energy

Explanation:

When ball is placed at some height "h" above the floor at rest then initial gravitational potential energy is given as

[tex]U = mgh[/tex]

here we know

m = mass of the ball

g = acceleration due to gravity

h = height of the ball

now when ball is dropped from this height then its initial potential energy will convert into kinetic energy.

so speed of ball at some instant of time is given as

[tex]\frac{1}{2} mv^2 = mgh[/tex]

[tex]v = \sqrt{2gh}[/tex]

so here in this case gravitational potential energy will convert into kinetic energy of ball

Answer:

The gradient of the mountain is 2.5 m.

Explanation:

Given that,

Height = 5000 m

Distance = 2 km

Gradient of the mountain is the ratio of rise of y axis and rise of x axis.

We need to calculate the gradient of the mountain

Using formula of gradient mountain

[tex]gradient\ mountain=\dfrac{rise\ y}{rise\ x}[/tex]

Put the value into the formula

[tex]gradient\ mountain=\dfrac{5000}{2000}[/tex]

[tex]gradient\ mountain=2.5\ m[/tex]

Hence, The gradient of the mountain is 2.5 m.

Answer:

B

Explanation:

Edge 2020

The answer is C.  

An object on the moon is six times lighter than on Earth.

The statement accurately describes the weight of an object on the moon is  An object on the moon is 1/6 times lighter than on Earth.

The weight is the product of mass of the object and acceleration due to gravity on the specific planet.

When the acceleration due to gravity is less, the weight measured will be less. The acceleration due to gravity on the moon is 1.6 m/s2, about a sixth that of Earth’s.

Thus, an object on the moon is 1/6 times lighter than on Earth.

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When two permanent magnets are placed adjacent to each other then they will exert magnetic force on each other.

There are four fundamental forces in nature

1. Gravitational force

2. Electromagnetic force

3. Weak Nuclear force

4. Strong nuclear force

So here magnets will exert two fundamental forces on each other Electromagnetic force and Gravity

#2

mass is defined as the composition or amount of substance while we can define weight as gravitational force of earth of the given object

Now when we transport an object from surface of earth to space far away from any planet then the amount of substance or mass will not change while the weight of the substance will decrease to zero because there is no gravity at this position

So we can say

mass = constant and will remain same

Weight = mass * gravity = 0

The weight of the object changes, the mass stays the same

The electromagnetic and gravitational forces are what affect two permanent magnets placed an inch apart, with electromagnetism being the stronger influence. If an object is moved to deep space, its weight changes due to reduced gravity, but its mass remains constant.

When two strong permanent magnets are placed one inch apart, the two fundamental forces that will most affect them are electromagnetic and gravity. The electromagnetic force is responsible for the interaction between the magnetic fields of the magnets, causing them to attract or repel each other depending on their poles. Despite being a very weak force in comparison, gravity also acts upon the magnets, although its effect is negligible compared to the electromagnetic force.

In the case of an object transported from Earth to deep space, the weight of the object changes, but the mass stays the same. Weight is the force exerted on an object by gravity, which would decrease significantly far from any stars or planets. However, mass is a measure of the amount of matter in an object, which remains constant regardless of location.

the correct answer is 0

The child walked a total distance of 1772 meters, which is the perimeter of the rectangular park measured by adding together twice the length and twice the width of the park.

To find out the distance the child walked around the rectangular park, we calculate the perimeter of the rectangle. The park is mentioned to be 411 meters wide and 475 meters long. To compute the perimeter, we add the length of all four sides of the rectangle together:

Perimeter of rectangle = 2( length) + 2(width)

Perimeter of the park = 2(475 m) + 2(411 m)

Perimeter of the park = 950 m + 822 m

Perimeter of the park = 1772 m

Therefore, the child walked a total distance equal to the perimeter of the park which is 1772 meters.

Water is placed at room temperature at 20 degree C

now after some water evaporate at room temperature

so here we can say speed of water molecules will not change as the temperature is same after evaporation

as we know that total kinetic energy is given by

[tex]KE = \frac{f}{2} nRT[/tex]

since temperature is same then energy will not change here

now as water evaporate to vapors then we can say that here all molecules are separated more in vapor phase so force of interaction will be less in this phase

And since potential energy depends on the force so potential energy will decrease in this phase

When water evaporates, the molecules that escape to the gas phase have an increase in average kinetic energy and a decrease in average potential energy.

When a liquid, such as water, evaporates, the molecules that escape into the gas phase have an increase in average kinetic energy and a decrease in average potential energy compared to when they were in the liquid phase.

The increase in average kinetic energy is due to the fact that molecules in the gas phase move faster than those in the liquid phase. This increase in kinetic energy allows the molecules to overcome the intermolecular forces and escape into the gas phase.

On the other hand, the decrease in average potential energy occurs because the intermolecular forces holding the liquid together are weaker than those between molecules in the gas phase. As a result, the average potential energy of the molecules that escape to the gas phase is lower.

Answer: 1500 m/sec. ( b )

Solution:

V= f (λ)

Speed = frequency. Wavelength  

And frequency = 1/time period

First we will find the frequency :

Frequency = 1/time period

1/0.006 = 166.67 Hz

Using this in the equation:

Speed = frequency. Wavelength  

V= f (λ)

9 × 166.67  

= 1500.03 ≈ 1500

V (Speed) = 1500 m/s.

Note: Do not forget to mention the units or otherwise they may cost you marks!

Answer:

B

Explanation:

The vector best represents the net force acting on the +4 C charge in the diagram is X. The correct option is B.

A vector is the representation of a physical quantity in magnitude and direction.

A vector incline at an angle in has two components. On in x direction and other is in y direction.

Three charges are located at the vertices of a triangle, as shown.

The vector best represents the net force acting on the +4 C charge in the diagram is X.

Thus, the correct option is B.

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The prefix "giga..." means 1 billion. We talk about that flash drive as if its capacity is exactly 1 billion bytes.

But with digital things, a "giga..." Is actually 2^30 = 1,073,741,824 .