An airplane is traveling from North Africa to England. Which arrow correctly shows the direction gravity pulls the plane?

(A) 1

(B) 2

(C) 3

(D) 4

Answer:

it is called melting or phase transition :)

Explanation:

Answer: The rating scale that is used in food history inventory is from 1 to 8.

Explanation:

In this case the participants have to rate 24 items on a scale of 1 to 8.There are variety of questions related to food or fooding habits.

The questions like do you go out for food?

Do you like bread ? if yes how will you rate it on a scale of 1 to 8.

The questions like this has to be answered in a way . It is done in order to see the preferences and false memory  regarding the food preference that people have.

As the altitude decreases,air pressure increases. The statement is true. Option A is correct.

The force applied perpendicular to the surface of an item per unit area across which that force is spread is known as pressure.

It is denoted by P. The pressure relative to the ambient pressure is known as gauge pressure.

As the altitude decreases,air pressure increases. The statement is true.

Hence, option A is correct, and the given statement is true.

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Answer:

100 N

Explanation:

From the question given above, the following data were obtained:

Mass (m) = 5 kg

Acceleration (a) = 20 m/s

Force (F) =?

Force is simply defined as the product of mass and acceleration. Mathematically, it can be expressed as:

Force (F) = mass (m) × acceleration (a)

F = ma

With the above formula, we can obtain the force need to move the object. This can be obtained as follow:

Mass (m) = 5 kg

Acceleration (a) = 20 m/s

Force (F) =?

F = ma

F = 5 × 20

F = 100 N

Therefore, a force of 100 N is needed to move the object.

Explanation:

Mass of a lump of gold remains constant where they may be shifted to because mass is depends on the amount of matter within a substance.

At anywhere in the universe, the mass of a body is a constant provided there is no loss in the amount of matter it contains.

Answer:

Explanation:

Mass - 3

Height - 1

Gravity - 1

Velocity - 2

Potential Energy: mgh

Kinetic Energy: 1/2mv^2

Answer: D.Touch it with the ground

Explanation:

The charged object can become neutral if touched with the ground in a process known as grounding.

If the charged object is negatively charged, excess electrons will flow into the ground thus making the object neutral. If the object is positively charged, electrons will flow from the ground into the object and neutralise it.

Answer:

The frequency of the swing: 1/2 Hertz

The period is: 2 Seconds

Explanation:

The time the kid takes to make a complete to-and-fro swing = 2 seconds

The period, T, is the time it takes to make one complete cycle of an oscillatory motion, therefore, we have;

The frequency, f, is the number of cycles completed each second, therefore, we have;

The time for 1 cycle = 2 seconds

2 seconds = 1 cycle

Dividing both sides by 2 gives;

2/2 seconds = 1/2 cycles

2/2 = 1

In 2/2 = 1 seconds The number of cycles completed = 1/2 cycles

Therefore, the number of cycles completed per (one) second = 1/2 cycles

Therefore the frequency of the swing, f = 1/2 cycle/seconds = 1/2 Hertz

The period, T, is the time it takes to complete one to-and-fro swing which is one cycle which is 2 seconds

Therefore, the period is 2 Seconds.

The force applied in raising the block to the given height is 25 N.

The given parameters:

The force applied in raising the block to the given height is calculated as follows;

[tex]Work \ done= \ F \times d\\\\W = Fd\\\\F = \frac{W}{d} \\\\F = \frac{50 \ J}{2 \ m} \\\\F = 25 \ N[/tex]

Thus, the force applied in raising the block to the given height is 25 N.

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Answer:radio waves are electromagnetic waves propagating in any non-conductive media by varying the field at each point in it. Sound is a wave of pressure changes of the medium such as air. Radio waves are a combination of electric and magnetic fields that need no medium to travel upon.

Explanation:please give brainliest

Radio waves are longest electromagnetic waves whereas sound waves are mechanical waves. Sound waves can move only through a medium and electromagnetic waves does not need a medium to travel.

Radio waves are a kind of electromagnetic waves. In the electromagnetic spectrum, radio waves has the longest wavelength and smallest frequency. Thus, radio waves have lower energy in comparison to other electromagnetic waves.

Sound waves are mechanical waves. Mechanical waves needs a medium to travel where as electromagnetic waves does not need a medium and they can moves through vacuum.

Sound waves are longitudinal mechanical waves where, the oscillation of particles is in the direction along the wave propagation. Electromagnetic waves are more energetic and faster than sound waves.

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Answer:

50%

Explanation:

2326/4696 = 0.495

Can be rounded to: 0.50

50%

Answer:

50

Explanation:

just took the test :)

Answer:

Explanation:

The following data

Distance x = 17km = 17000m

Speed v = 340m/s

Using the formula to get the time;

2x = vt

t = 2x/v

t = 2(17000)/340

t = 34000/340

t = 100secs

Hence it takes 100seconds for the sound to reach your ears

Answer:

1. First-quarter moon.

2. New moon.

3. Full moon.

4. 13 degrees.

5. 29 1/2 days.

Explanation:

A moon can be defined as the natural satellite of planet earth that shines as a result of the sun's reflected light, as it revolves around the earth from west to east in 29½ days.

1. First-quarter moon: a visible half-circle.

2. New moon: darkest phase of the moon.

3. Full moon: when the the Earth is between the sun and the moon.

4. 13 degrees: this is a measurement of how far the moon advances each day in orbit.

5. 29 1/2 days: the time the Earth must rotate to return to same position relative to the moon.

Answer:

8.5 km/hr

Explanation:

The helicopter is going past the ground at a velocity 8.5 km/hr in north direction relative to ground.

The rate at which a body's displacement changes in relation to time is known as its velocity. Velocity is a vector quantity with both magnitude and direction. SI unit of velocity is meter/second.

Given that:

Velocity of a helicopter with respect to the clouds is: v= 5 km/hr in north direction.

Velocity of the clouds with respect to the ground: u= 3.5 km/hr  in north direction.

So, Velocity of a helicopter with respect to the ground: V = v + u

= ( 5 +3.5) km/hr in north direction.

= 8.5 km/hr in north direction.

Hence, the helicopter is going past the ground at a velocity 8.5 km/hr in north direction relative to ground.

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Answer:

the scientific concept being illustrated in this model is dispersion

An ammeter is connected series in a circuit. An ammeter is used to detect how much current is flowing through the circuit, so the Resistance of ammeter is very low by connecting it parallel to a circuit this may cause short circuit and burn the ammeter or the circuit.

Answer:

The answer to this question is given below in this explanation section.

Explanation:

"electromagnetic spectrum depends on wavelength and frequency"

When electromagnetic radiation interacts with single atoms and molecule,its behavior also depends on the amount of energy per quantum(photon)it carries wave number =1/wavelength in cm speed of light=wavelength x frequency energy = Planck's constant x frequency.

Electromagnetic radiation interacts with matter in different parts of the spectrum.

Electromagnetic radiation interacts with matter in different ways in different parts of the spectrum.The types of interaction can be so different that it seems justified to refer to different types of radiation.There is a continuum containing all these different kind of electromagnetic radiation.Thus we refer to spectrum but divide it up based on the different interaction with matter.

Answer:

Energy increases with decreasing wavelength and increasing frequency.

Explanation:

Answer:

The acceleration of the object is 314.57 m/[tex]s^{2}[/tex].

Explanation:

From Newton's second law of motion,

F = ma

where: F is the force applied on an object, m is the mass of the object and a is the acceleration of the object.

⇒ a = [tex]\frac{F}{m}[/tex]

In the given question, the resultant force, F should be determined.

Total horizontal force, [tex]F_{x}[/tex] = 16 - 126

                                    = -110 N

The horizontal force applied to the object is 110 N to the left.

Vertical force, [tex]F_{y}[/tex] = 4 N.

Resultant force, F = [tex]\sqrt{F_{x} ^{2} + F_{y} ^{2} }[/tex]

                         = [tex]\sqrt{(-110)^{2} + (4)^{2} }[/tex]

                        = [tex]\sqrt{12116}[/tex]

                        = 110.0727

Resultant force, F = 110.1 N

So that,

a = [tex]\frac{110.1}{0.35}[/tex]

  = 314.5714

a = 314.57 m/[tex]s^{2}[/tex]

The acceleration of the object is 314.57 m/[tex]s^{2}[/tex].

Answer:

A mole of any chemical is 6.02 x 1023 units of that chemical. So, 3.5 moles of carbon means 6.02 x 1023 x 3.5 atoms of Carbon.

Explanation:

Answer:

1) The Mechanical Advantage of the lever is 3

2) The velocity ratio of the lever is 4

3) The efficiency of the lever is 75%

Explanation:

A lever is a simple machine that is used to lift a heavy load with a little effort or force

The mechanical advantage is the ratio of the force output to the force input

The given parameters of the lever are;

The length of the lever = 1 m

The weight of the load (force output), [tex]F_r[/tex] = 600 N

The effort applied (force input), [tex]F_e[/tex] = 200 N

1) The Mechanical Advantage, MA of the lever is given as follows;

[tex]MA = \dfrac{F_r}{F_e} = \dfrac{600 \ N}{200 \ N} = 3[/tex]

The Mechanical Advantage, MA of the lever = 3

2) The velocity ratio, V.R., is the ratio of the distance moved by the effort, [tex]L_e[/tex], to the distance moved by the load, [tex]L_r[/tex]

For the lever, we have;

The distance of the load from the fulcrum, [tex]L_r[/tex] = 20 cm = 0.2 m

Therefore, we have;

The distance of the effort from the fulcrum, [tex]L_e[/tex] = 1 m - 0.2 m = 0.8 m

From which we have;

[tex]V.R.= \dfrac{L_e}{L_r} = \dfrac{0.8 \ m}{0.2 \ m} = 4[/tex]

The velocity ratio of the lever = 4

3) The efficiency, η, is given as follow;

[tex]\%Efficiency, \, \eta = \dfrac{M.A.}{V.R.} \times 100 = \dfrac{3}{4} \times 100 = 75\%[/tex]

The efficiency of the lever is 0.75 or 75%.

Explanation:

The length of the lever = 1 m

The weight of the load (force output), F_rF

r

= 600 N

The effort applied (force input), F_eF

e

= 200 N

1) The Mechanical Advantage, MA of the lever is given as follows;

MA = \dfrac{F_r}{F_e} = \dfrac{600 \ N}{200 \ N} = 3MA=

F

e

F

r

The length of the lever = 1 m

The weight of the load (force output), F_rF

r

= 600 N

The effort applied (force input), F_eF

e

= 200 N

1) The Mechanical Advantage, MA of the lever is given as follows;

MA = \dfrac{F_r}{F_e} = \dfra

=

200 N

600 N

=3

The Mechanical Advantage, MA of the lever = 3

2) The velocity ratio, V.R., is the ratio of the distance moved by the effort, L_eL

e

, to the distance moved by the load, L_rL

r

For the lever, we have;

The distance of the load from the fulcrum, L_rL

r

= 20 cm = 0.2 m

Therefore, we have;

The distance of the effort from the fulcrum, L_eL

e

= 1 m - 0.2 m = 0.8 m

From which we have;

V.R.= \dfrac{L_e}{L_r} = \dfra

The distance of the load from the fulcrum, L_rL

r

= 20 cm = 0.2 m

Therefore, we have;

The distance of the effort from t

V.R.= \dfrac{L_e}{L_r} = \dfrac{0.8

L

e

=

0.2 m

0.8 m

=4

The velocity ratio of the lever = 4

3) The efficiency, η, is given as follow;

\%Efficiency, \, \eta = \dfrac{M.A.}{V.R.} \times 100 = \dfrac{3}{4} \times 100 = 75\%%Efficiency,η=

V.R.

M.A.

×100=

4

3

×100=75%

The efficiency of the lever is 0.75 or 75

Answer:

17N right

Explanation:

Answer:

Static friction

Explanation:

Static friction is the friction force that acts on objects that are not moving.

Answer:

convection in the mantle.

Answer:

21 miles

Explanation:

3 miles an hour for 7 hours

Its simply 7m*3m/hr=21 miles

Answer:

70.8m

Explanation:

Given parameters:

Time of fall  = 3.8s

Unknown:

Depth of the mine  = ?

Solution:

To solve this problem, we use the appropriate motion equation as shown  below;

            S  = ut + [tex]\frac{1}{2}[/tex] at²  

S is the depth

u is the initial velocity  = 0m/s

t is the time taken

a is the acceleration due to gravity

  Now insert the parameters and solve;

    Since u  = 0;

    S  =    [tex]\frac{1}{2}[/tex] at²    = [tex]\frac{1}{2}[/tex] x 9.8 x 3.8²   = 70.8m

Answer:

The velocity of the particle from T = 0 s to T = 4 s is;

0.5 m/s

Explanation:

The given parameters from the graph are;

The initial displacement (covered) at time, t₁ = 0 s is x₁ = 1 m

The displacement covered at time, t₂ = 4 s is x₂ = 3 m

The graph of distance to time, from time t = 0 to time t = 4 is a straight line graph, with the velocity given by the rate of change of the displacement to the time which is dx/dt which is also the slope of the graph given as follows;

[tex]The \ slope \ of \ the \ displacement \ time \ graph, \ m =velocity, \ v= \dfrac{x_2 - x_1}{t_2 - t_1}[/tex]

[tex]Therefore, \ the \ velocity \ of \ the \ particle \ v = \dfrac{3 \ m - 1 \ m}{4 \ s - 0 \ s} = \dfrac{2 \ m}{4 \ s} = \dfrac{1}{2} \ m/s[/tex]

The velocity of the particle from t = 0 s to t  = 4 s = 1/2 m/s = 0.5 m/s.