what would happen to convection currents when the heat source is removed

Answer:

See explanation

Explanation:

It is a common observation that when water drops on a clean glass surface, it appears as little bags of water.

Surface tension makes water surface act like a stretched elastic skin bag.

Surface tension is caused by attractive forces between the molecules at the surface and the molecules in the bulk of a liquid. Remember that the forces of cohesion between water molecules are very strong.

When surfactants such as soap are added to water, the surface tension of water is decreased, hence the experiment.

Answer:

Inertia

F=ma

Action, reaction

All of the above

A heavy object requires more force to push than a lighter object.

Answer:

6.32s

Explanation:

Given parameters:

Length of track and distance covered  = 200m

Acceleration  = 10m/s²

Unknown:

Time taken to cover the track  = ?

Solution:

To solve this problem, we apply one of the motion equations as shown below:

       S  = ut + \(\frac{1}{2}\) at²  

S is the distance covered

t is the time taken

a the acceleration

u is the initial velocity

The initial velocity of Superman is 0;

 So;

     S  =  \(\frac{1}{2}\) at²  

        200  =  \(\frac{1}{2}\) x 10 x t²  

          200  = 5t²  

            t²  = 40

            t  = 6.32s

A star of the apparent magnitude of +1 would appear farther away than a star of the apparent magnitude of +2. Hence, option B is correct.

In astronomy, a star is a brilliant plasma spheroid that is held together through gravity. The Sun is the planet's closest star. The human eye can see a great number of other stars at night, but due to our planet's size, they seem alike stationary points of light.

Numerous of the shining stars were given names, whereas the most notable stars have been grouped into constellations and asterisms. The known stars have been recognized and given standard designations in star inventories that astronomers have put together.

The birth of a star is caused by the gravitational attraction of a gaseous nebula made largely of hydrogen, helium, and traces of transition metals. Its overall mass is the primary factor influencing how it will develop and end up.

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The angular frequency obtained is 3.76 × 10⁻⁷ rad/sec. The orbital period planet of the planet in Earth days is 193.51 days.

Given data:

Mass of the planet (m) = 7.15 × 10²⁴ kg

Mass of the star (M) = 1.95 × 10²⁹ kg

Radius of the orbit (r) = 5.95 × 10⁷ km

Orbital period is given by T = (2π) ÷ ω

we know that,

(GMm) ÷ (R)² = mω²R

ω = √(GM) ÷ R³

On substituting the value:

ω = 3.76 × 10⁻⁷ rad/sec

The time period is:

T = (2π) ÷ 3.76 × 10⁻⁷

T = 16719389.62 sec

Hence on converting from seconds to days the time period obtained is:

T = 193.51 days.

Therefore, The orbital period planet of the planet in Earth days is 193.51 days.

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Your body is pulling on the Earth with the same reaction force that the Earth is pulling on you.

The gravitational force, which is what pushes mass-containing objects toward one another. We frequently consider the pull of gravity from the Earth. Your body is kept on the ground by this force. However, all mass-bearing objects are pulled toward one another by gravity.

An action force with an opposite direction has an effect called a reaction force. These two forces—also referred to as action and reaction forces—are covered by Newton's third law of motion. According to Newton's third law, there is an equal and opposite reaction to every action.

The gravitational force that pulls a body toward the earth or another celestial body; it is equal to the mass times the acceleration due to local gravity.

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Answer:

If a body is moving with uniform velocity, acceleration is zero. So net force acting on it will be also zero. But the body has energy due to its constant motion.

Answer:

La fuerza magnética del electrón es 6.41x10⁻¹³ N.

Explanation:

Podemos encontrar la fuerza magnética (F) usando la ley de Lorentz:

\( F = qv\times B \)

En donde:

q: es la carga del electrón = 1.602x10⁻¹⁹ C

v: es la velocidad del electrón = 5x10⁶ m/s

B: es el campo magnético = 0.8 T

\( F = qv\times B = 1.602 \cdot 10^{-19} C*5\cdot 10^{6} m/s*0.8 T = 6.41 \cdot 10^{-13} N \)                                

Por lo tanto, la fuerza magnética del electrón es 6.41x10⁻¹³ N.

Espero que te sea de utilidad!  

Answer:

Scissors

Tap

Spanner

Explanation:

Answer:  32

The average velocity of the rock would be 32 ft per second.

The rock will be 15ft above the ground 0.25 and 2.5secs after

The height of the rock above the ground is expressed according to the expression \(s(t)=-16t^2+44t+5\)

In order to get the time the rock will be 15ft above the ground, we will substitute s(t) = 15 ft into the formula above;

\(15= -16t^2+44t+5\\-16t^2+44t = 15 -5\\-16t^2+44t = 10\\-16t^2+44t- 10 = 0\\16t^2-44t+10=0\)

Factorize the expression to get the value of "t"

2(4t−1)(2t−5) = 0

4t - 1 = 0

4t = 1

t = 0.25secs

Similarly 2t - 5 =0

2t = 5

t = 5/2 = 2.5secs

This shows that the rock will be 15ft above the ground 0.25 and 2.5secs after

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Radial component of the linear acceleration = 99.47 m/s^2

The diameter of the wheel, d = 51 cm

The radius, r = d/2 = 51/2 = 25.5 cm

r = 25.5/100 = 0.255 m

r = 0.255 m

At t = 1.1, first calculate the new angular velocity

The radial component of the linear acceleration is given as:

Answer:

Below

Explanation:

All we need to do for this question is to plug in our values and solve!

      Force = mass x acceleration

      Force = 10 kg x 4 m/s^2

     Force = 40 Newtons or 40 N

If your teacher requires you to round to sig figs it would be :

    F = 4 x 10^1 N

Hope this helps!

The ranks are:

Capacitor C: side length 2l, distance between plates d, dielectric constant 2K. > Capacitor B: side length 1/2, distance between plates d/2, dielectric constant 4K. > Capacitor A: side length l, distance between plates d, dielectric constant K. = Capacitor D: side length l, distance between plates 2d, dielectric constant 2K.

The structure of a capacitor is made of 2 metal plates separated by a dielectric material.

If both ends of the metal plate are given an electric voltage, positive charges will collect on one of the metal legs (electrodes) and at the same time negative charges collect on the other end of the metal.

Positive charge cannot flow towards the end of the negative pole and vice versa negative charge cannot go to the end of the positive pole, because it is separated by a non-conductive dielectric material.

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Answer:

I know I am a very good answerable teacher but I can't answer this question I don't know what

Answer:

The answer is B

Explanation:

I got this from study island

Answer:

858.7 N

Explanation:

The magnetic force on the charge F = Bqv where B = magnetic field strength = 4.02 mT = 4.02 × 10⁻³ T, q = charge = 7.12 μC = 7.12 × 10⁻⁶ C and v = c = speed of light = 3 × 10⁸ m/s

F = Bqc

=  4.02 × 10⁻³ T × 7.12 × 10⁻⁶ C × 3 × 10⁸ m/s

= 858.7 N

Answer:

The Convex Mirror is used.

Explanation:

The power gain when the gain falls by 3 dB is approximately 300.7 mW, which is closest to option D: 244.2 mW.

The power gain of an amplifier can be calculated using the formula:

Power Gain (dB) = 10 * log10(Pout / Pin)

where Pout is the output power and Pin is the input power. In this case, the midrange gain of the amplifier is given as 600 mW.

To calculate the power gain when the gain falls by 3 dB, we need to find the new output power. Since the gain is decreasing, the new output power will be lower than the initial power.

First, we convert the midrange gain from milliwatts to watts:

Midrange Gain = 600 mW = 0.6 W

Next, we use the formula:

Pout / Pin = 10^(Power Gain / 10)

Since the gain falls by 3 dB, the new power gain is:

Power Gain = -3 dB

Now we substitute the values into the formula:

Pout / Pin = 10^(-3 / 10)

Pout / Pin = 10^(-0.3)

Pout / Pin = 0.5012

To find the new output power (Pout), we multiply the input power (Pin) by the ratio:

Pout = Pin * 0.5012

Pout = 0.6 W * 0.5012

Pout = 0.3007 W

Finally, we convert the output power back to milliwatts:

Pout = 0.3007 W = 300.7 mW

Therefore, the power gain when the gain falls by 3 dB is approximately 300.7 mW, which is closest to option D: 244.2 mW.

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A 5.0-kg block suspended from a spring scale is slowly lowered onto a vertical spring

Part A: The scale reads 49.05 N before the block touches the vertical spring.

Part B: If the scale reads 34N when the bottom spring is compressed 30 mm, k for the bottom spring is 500 N/m.

Part C: The block compresses the bottom spring by 0.0981 m (or 98.1 mm) when the scale reads 0.

Part A:
Before the block touches the vertical spring, the only force acting on it is gravity. To find the scale reading, we can use the weight formula:
Weight = mass × gravity
Weight = 5.0 kg × 9.81 m/s²
Weight = 49.05 N
The scale reads 49.05 N before the block touches the vertical spring.
Part B:
To find the spring constant (k) for the bottom spring, we can use Hooke's Law:
F = k × Δx
The force applied on the spring is the difference between the weight of the block and the scale reading:
Force = Weight - Scale reading
Force = 49.05 N - 34 N
Force = 15 N
The compression distance (Δx) is given as 30 mm, which is equivalent to 0.03 m.
Now we can find k:
15 N = k × 0.03 m
k = 15 N / 0.03 m
k = 500 N/m
The spring constant (k) for the bottom spring is 500 N/m.
Part C:
When the scale reads 0, the force applied by the spring is equal to the weight of the block. We can use Hooke's Law again:
F = k × Δx
Substitute the values we know:
49.05 N = 500 N/m × Δx
Δx = 49.05 N / 500 N/m
Δx = 0.0981 m
The block compresses the bottom spring by 0.0981 m (or 98.1 mm) when the scale reads 0.

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A river 100 m wide flows due south at 1 m/s, a boat that goes 1 m/s relative to the water .The resultant distance will be 141m.

Option A is correct.

The sum of an object's individual vector velocities is its final velocity. The scalar product of an object's mass and its acceleration vector is equal to the sum of its vector forces.

Considering that the boat travels in a river that flows 1 m/s due south at a speed of 1 m/s due east.

The positive x and y axes should be represented by the north and east, respectively.

After that, we can convert the boat's resulting velocity into a vector.

Vr = i - j ( 1 m/s on x axis and -1m/s on y axis)

The time required to travel 100m from west to east at a speed of 1m/s is;

Time t = distance/speed = 100m/1m/s = 100s

Distance = velocity × time = (i - j) × 100 = 100i - 100j

Distance = 100i - 100j (in vector form)

Magnitude of the Resultant distance can be given as:

dr = √(dx ²+ dy²)

dr = √(100² + 100²)

dr = √(20000)

dr = 141.42m

dr = 141m

The relative velocity refers to how one observer would perceive another moving object within their own frame. The velocity of an object when there are multiple influences on its motion in a fixed reference frame is known as the resultant velocity.

At the point when an item, say, a boat, goes at a specific speed, and the medium through which it voyages, say, a stream, has its own speed, we can track down the resultant speed of the item by adding the two speeds. We find the boat's resulting velocity vector in this example.

Incomplete question:

A river 100 m wide flows 1 m/s due south. A boat that travels 1 m/s relative to the water is pointed due east as it crosses from the west bank. Relative to its starting point, the boat travels

A) 141 m.

B) 100 m.

C) 200 m.

D) more than 200 m.

E) nowhere

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The new kinetic energy (KE') is twice the οriginal kinetic energy (KE), which means it increases by a factοr οf 2. Therefοre, οptiοn (a) is cοrrect.

When the speed οf a car is dοubled, the kinetic energy increases by a factοr οf 4.

The kinetic energy (KE) οf an οbject is given by the equatiοn:

KE = (1/2) × m × v²

where m is the mass οf the οbject and v is its velοcity (speed).

When the speed is dοubled, the new velοcity becοmes 2v. Substituting this intο the kinetic energy equatiοn:

KE' = (1/2) × m × (2v)²

= (1/2) × m × 4v²

= 2× * (1/2) × m × v²

= 2 × KE

The new kinetic energy (KE') is twice the οriginal kinetic energy (KE), which means it increases by a factοr οf 2. Therefοre, οptiοn (a) is cοrrect.

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Answer:

The formula is W=mg.

1.) W=40×10=400.

2.)W=40×5=200.

3.)W=40×150=6000.

Answer:

A ( Jack did twice as much work as Jill

Explanation:

Answer:

fffffff

Explanation:

The momentum of the system is -20 kg*m/s in the negative x-axis direction.

What is momentum?

Momentum is a fundamental concept in physics that describes the motion of an object. It is a vector quantity, meaning it has both magnitude and direction. The momentum of an object is equal to its mass multiplied by its velocity, or p = mv. The direction of the momentum is the same as the direction of the velocity.

The momentum of a system can be determined by summing the momenta of the individual objects in the system. The momentum of an object is equal to its mass multiplied by its velocity. The direction of the momentum is the same as the direction of the velocity.

For the first object, the momentum is:

p1 = mi * vi

p1 = 6 kg * 13 m/s

p1 = 78 kg*m/s (in positive x-axis direction)

For the second object, the momentum is:

p2 = mz * vz

p2 = 14 kg * -7 m/s

p2 = -98 kg*m/s (in negative x-axis direction)

To find the total momentum of the system, we add the momenta of the two objects:

p_total = p1 + p2

p_total = 78 kgm/s + (-98 kgm/s)

p_total = -20 kg*m/s (in negative x-axis direction)

So the momentum of the system is -20 kg*m/s in the negative x-axis direction.

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Answer:

Friction can be increased the longer two objects are rubbed together, since the longer they are rubbed is the more heat produced.

Explanation:

Answer:

walking, car moving

Explanation:

basically anything with two surfaces pressing together ig

Answer:

1025meter

Explanation:Distance is speed times time.so 3hx115km/h=345km

                                                                              5hx136km/h=680km

                                                                              345km+680km=1025km

Answer:

1025

Explanation:

We can use the equation c = λf, where c is the speed of light, λ is the wavelength, and f is the frequency. Therefore, the wavelength of these gamma rays is approximately 0.459 nanometers.

We can use the equation c = λf, where c is the speed of light, λ is the wavelength, and f is the frequency.

c = 299,792,458 m/s (speed of light)

f = 6.52 × 10^21 Hz (given frequency)

Solving for λ:

λ = c / f

λ = 299,792,458 m/s / 6.52 × 10^21 Hz

λ = 4.59 × 10^-14 m

To express the wavelength in nanometers, we can multiply by 10^9:

λ = 4.59 × 10^-14 m * 10^9 nm/m

λ ≈ 0.459 nm

Therefore, the wavelength of these gamma rays is approximately 0.459 nanometers.

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Answer:

119 cm

Explanation:

Given heights :  200cm , 188 cm , 175 cm, 160 cm

since the eyes are at 95% level

95% of 200 cm = 190 cm

95% of 160 cm = 152 cm

hence the allowable height of mirror = 200 - ( 5 + 76 ) = 119 cm

and The mirror should be hung 75cm from the floor

Answer:

1) Acids have a sour taste , Bases have a bitter taste.

2) Acids turn blue litmus paper into red , Bases turn red litmus paper into blue.

3) Acids react with most metals to form Hydrogen gas but only a few base react with a few metals to form Hydrogen gas

4) Both will conduct electricity. Both acids & bases are good electrolytes. Strong acids & bases conduct more electricity than that of weak acids & bases

Fill in the blanks with the properties of acids and bases as follows:

The properties of acids are as follows:

Therefore, fill in the blanks with the properties of acids and bases are well described above.

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