A force of 40 Newtons is applied to a mass resulting in an acceleration of 8 m/s2. What force would need to be applied to this mass to cause an acceleration of 25 m/s2?

A- 125 N
B- 50 N
С- 5 N
D- 0.2 N

Answer:

See the answer below

Explanation:

Peppered moths use the adaptation of camouflage as protection from predators. They may have a variety of colors or shades, but before the Industrial Revolution, they were typically white with black speckles. The Industrial Revolution in the 1880s introduced large-scale pollution into the environment. The pollution resulted in widespread, dark-colored staining of buildings and trees.  Which is the most likely effect of the Industrial Revolution on peppered moths in cities?

The correct answer would be that the population of light-colored moths decreased and the population of dark-colored moths increased.

Organisms evolve so as to adapt to changes in their environment for continued survival. Peppered moths served as preys for birds and one of the adaptations to survive is adaptive coloration. In an environment characterized by dark-colored  buildings and trees, light-colored moths would easily be picked out by predating birds, unlike dark-colored ones.

Hence, more of the light-colored moths would be picked out by predators while the dark-colored ones would be able to reproduce and multiply at a faster rate than their counterparts. The implication is that there would be a decrease in the population of light-colored moths and an increase in the population of the dark-colored ones.

Explanation:

0.023, 1.0000004, 1.100

Answer:

m = 0.409 [kg].

Explanation:

The friction force is defined as the product of the coefficient of friction by the normal force. In this way, we have the following equation.

F = μ*N

Where:

F = friction force = 1.11 [N]

μ = static coefficient = 0.276

N = Normal force [N]

We can clear the normal Force.

[tex]N=F/u\\N=1.11/0.276\\N=4.02[N][/tex]

And the normal force of a body lying on a horizontal surface, can be calculated by means of the product of mass by gravitational acceleration.

[tex]N=m*g\\4.02=m*9.81\\m=0.409[kg][/tex]

Answer:

.409

Explanation:

its the right answer for acellus

Answer: 3,000 N

Explanation:

F = mass x acceleration

F = (1500 kg)(2 m/s²)

F = 3000 N

Answer:

The motorcyclist is 55 miles east of the small town.

Explanation:

Motion With Constant Acceleration

It's a type of motion where the velocity of an object changes uniformly in time.

The equation that rules the change of velocities is:

[tex]v_f=v_o+at\qquad\qquad [1][/tex]

Where:

a   = acceleration

vo = initial speed

vf  = final speed

t    = time

The distance traveled by the object is given by:

[tex]\displaystyle x=v_o.t+\frac{a.t^2}{2}\qquad\qquad [2][/tex]

Using the equation [1] we can solve for a:

[tex]\displaystyle a=\frac{v_f-v_o}{t}[/tex]

Solving [1] for t and substituting into [2] we get the following equation:

[tex]V_f^2=V_o^2+2aX[/tex]

The motorcyclist has an acceleration of a=4\ m/s^2 and an initial distance of 5 m where he travels at vo=15 m/s.  It's required to calculate the distance when the speed is vf=25 m/s.

Solving the last equation for X:

[tex]\displaystyle X=\frac{V_f^2-V_o^2}{2a}[/tex]

Substituting:

[tex]\displaystyle X=\frac{25^2-15^2}{2*4}[/tex]

[tex]\displaystyle X=\frac{625-225}{8}[/tex]

X = 50 m

Adding the initial distance:

The motorcyclist is 55 miles east of the small town.

The order should be: 20 glass mugs, 10 porcelain tea cups, 2 glass cups, and then 5 plastic cups.

Explanation:

You take the original mass of one single object, and then multiply it by the total number of that specific object. Hope this helps!

Answer:

slow

Explanation

because it weighs 1,200 kg and has a velocity of 30 m/s west. with all the friction causing it to become slower.

Answer:

If the wave slows down with no change in frequency, the wavelength decreases.

If the wave slows down with no change in frequency, then the wavelength decreases.

A wave is defined as the disturbance that has the ability to transfer energy from one point to another in a medium.

The properties of a wave are given as;

Wavelength can be defined as the distance that is observed between adjacent points in an identical cycle of a waveform.

Frequency is the number of cycles of a wave that can occur per minute time.

Time period can be defined as the time it takes for a complete cycle of wave to occur.

Wave speed can be defined as the distance a wave travels in a given amount of time.

Amplitude can be defined as the distance from the centre line (or the still position) to the top of a crest or to the bottom of a trough.

When there is a change in the speed of the wave then the length of the wave would decrease.

Learn more about wavelength here:

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Answer:

No. When the distance is doubled, the gravitational force is 1/4 times as strong, therefore, the correct answer is she is not correct

Explanation:

The gravitational force is given as follows;

[tex]F} =G \times \dfrac{m_{1} \times m_{2}}{r^{2}}[/tex]

Where;

m₁, and m₂ are the masses sharing the gravitational field

G = The universal gravitational constant

r = The distance between the centers of the two masses

Therefore, when the new distance, R = 2 × r, we get;

[tex]F} =G \times \dfrac{m_{1} \times m_{2}}{R^{2}} = G \times \dfrac{m_{1} \times m_{2}}{(2 \times r)^{2}} = G \times \dfrac{m_{1} \times m_{2}}{4 \times r^{2}} = \dfrac{1}{4} \times G \times \dfrac{m_{1} \times m_{2}}{r^{2}}[/tex]

Therefore, when the distance is doubled, the gravitational force is one fourth as strong, therefore, she is not correct.

The average speed of the car is 35 km/hr.

To calculate the average speed, the given values of speed are:

x = 20 km / hr

y = 50 km / hr

  If two objects are in motion, the distance by those two objects at any  particular interval of time is said to be average speed.

The unit of average speed is m/s or km/hr.

For this particular question, the formula to find the average speed from the given speed is,

                     Average speed =  ( x + y ) / 2

                                                =  ( 20 + 50 ) / 2

                                                = 70 /2

                                                = 35 km / hr.

Thus, Average speed can be calculated as 35 km/hr.

So, the Option C is the correct answer.

Learn more about Average speed,

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Answer:

Gold

Sliver

Copper

Mercury

brass

bronze

Lead

Aluminum

Used for making kettles

Used for making sauce pans

Good Uses:

Conductors of Heat:

Explanation:

[tex] \sin(60) = \frac{ \sqrt{3} }{2} \\ \\ \sin(60 ) {}^{2} = ( \frac{ \sqrt{3} }{2} ) {}^{2} \\ \\ \sin(60 ) {}^{2} = \frac{3}{4} [/tex]

Answer:

The correct answer is - Disagree with her.

Explanation:

Fluorescence substances are the substances that glow when they absorbed visible light and ultraviolet radiation and objects will glow when put under Ultraviolet light and makes the molecules excited.

Microwaves have a different wavelength than ultraviolet radiation and therefore does not able to excite the molecule of the fluorescent objects. The microwave radiation will not glow.

Thus, the correct answer is - disagree with her.

Answer:

Stellar evolution is the process by which a star changes over the course of time. Depending on the mass of the star, its lifetime can range from a few million years for the most massive to trillions of years for the least massive, which is considerably longer than the age of the universe. The table shows the lifetimes of stars as a function of their masses.[1] All stars are formed from collapsing clouds of gas and dust, often called nebulae or molecular clouds. Over the course of millions of years, these protostars settle down into a state of equilibrium, becoming what is known as a main-seque

Answer:

The force is applied for a longer time in the long cannon.

Answer:

The mechanical advantage of the wheelbarrow is the product of the mechanical advantage of the lever, and the mechanical advantage of the wheel and axle. Therefore, the wheelbarrow has a mechanical advantage of 4.

hope this helps :D

Answer:

[tex]9.01\times 10^{-31}\ kg[/tex]

Explanation:

Given that,

The gravitational force between two electrons is [tex]5.42\times 10^{-71}\ N[/tex]

The electrons are 1 m apart.

The formula for the gravitational force is given by :

[tex]F=G\dfrac{m^2}{r^2}[/tex]

Where

m is the mass of the electrons

[tex]m=\sqrt{\dfrac{Fr^2}{G}} \\\\m=\sqrt{\dfrac{5.42\times 10^{-71}\times 1^2}{6.67\times 10^{-11}}} \\\\m=9.01\times 10^{-31}\ kg[/tex]

So, the mass of the electron is [tex]9.01\times 10^{-31}\ kg[/tex].

Answer:

Number of moles or volume

Explanation:

The number 2 on the right hand side signifies the number of moles of the product being formed.

It is necessary to include this number so as not to flout the law of conservation of mass when writing a chemical equation. The law of conservation of mass states that "matter is neither created nor destroyed during the course of a chemical reaction".

Since we must have equal number of matter on both sides of the expression, the coefficient number like the 2 seen in the expression is used to create a balance.

Here, 2 moles of HCl is formed which consists of 1 hydrogen atom and 1 chlorine atom.

Answer:

gravity effects only the mass of an object

Explanation:

an acorn is heavier that a stick and it's round shape gives it less wind resistance so gravity pulls it down faster. A stick vertical has little wind resistance but when rotated to when it is horizontal it has more resistance so it slows down but the the force of gravity is still as strong. A leaf has very little mass and it's shape provideds lots of wind resistance so it falls slower. The moon is not only effected by the earth's gravity it is also effected by the suns. It has its own gravity as well. with all these factors it stays in place and moves with the earth.

Answer:

It is possible for neutral objects to become charged by rubbing them together due to friction. Electrons of one object transfer to the other resulting to more electrons in the object than its protons therefore leaving it as charged

Explanation:

I all ready said it 0>0

Answer:

no

Explanation:

because one itoms becomes positive and the other negative due to the transfer

Answer:

[tex]v_i=4.12\ m/s[/tex]

Explanation:

Given that,

Final velocity, [tex]v_f=0\ m/s[/tex]

Acceleration, [tex]a=-9.8\ m/s^2[/tex]

Displacement, [tex]\Delta x = 0.87\ m[/tex]

We need to find the initial velocity of the large hopper.

Using the third equation of motion as follows :

[tex]v_f^2=v_i^2+2a\Delta x\\\\0=v_i^2+2\times (-9.8)\times 0.87\\\\v_i^2-17.052=0\\\\v_i=4.12\ m/s[/tex]

So, the initial velocity of the large hopper is 4.12 m/s.

The horizontal velocity was constant, so:

[tex]s = vt[/tex]

[tex]s = 10\cdot9[/tex]

[tex]s = 90[/tex]

it traveled 90meters

Answer:

1. 0 J

2. 7500 J

3. 7500 J

Explanation:

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

Mass (m) of car = 600 Kg

Initial velocity (v₁) of car = 0 m/s

Final velocity (v₂) of car = 5 m/s

Original kinetic energy (KE₁) =?

Final kinetic energy (KE₂) =?

Work used =?

1. Determination of the original kinetic energy.

Mass (m) of car = 600 Kg

Initial velocity (v₁) of car = 0 m/s

Original kinetic energy (KE₁) =?

KE₁ = ½mv₁²

KE₁ = ½ × 600 × 0²

KE₁ = 0 J

Thus, the original kinetic energy of the car is 0 J.

2. Determination of the final kinetic energy.

Mass (m) of car = 600 Kg

Final velocity (v₂) of car = 5 m/s

Final kinetic energy (KE₂) =?

KE₂ = ½mv₂²

KE₂ = ½ × 600 × 5²

KE₂ = 300 × 25

KE₂ = 7500 J

Thus, the final kinetic energy of the car is 7500 J

3. Determination of the work used.

Original kinetic energy (KE₁) = 0

Final kinetic energy (KE₂) = 7500 J

Work used =?

Work used = KE₂ – KE₁

Work used = 7500 – 0

Work used = 7500 J

Answer:

.

Explanation:

Answer:

do sports eg skipping rope, playing basketball, badminton etc. in other words, activities that involve jumping

Answer:

1360.3ft

Explanation:

Given parameters:

Time taken for the fish to land  = 9.2s

Unknown:

Height of the cliff  = ?

Solution:

To solve this problem, we use one of the kinematics equation:

  S = Ut  + [tex]\frac{1}{2}[/tex] g t²  

 S is the height

 U  is the initial velocity  = 0m/s

 g is the acceleration due to gravity  = 9.8m/s²

t is the time taken  

So;

 S  = (0 x 9.2)  + ([tex]\frac{1}{2}[/tex] x 9.8 x 9.2²)   = 414.7m

            1m  = 3.28ft

       414.7m  = 414.7 x 3.28 = 1360.3ft

Answer:

The correct answer is - option C. G.

Explanation:

In this reaction diagram, there is a representation of the reaction profile. The reaction profile shows the change that takes place during a reaction in the energy of reactants or substrate and products. In this profile, activation energy looks like a hump in the line, and the minimum energy required to initiate the reaction.

The overall energy of the reaction, including or excluding activation energy depends on the nature of the reaction if it is exothermic or endothermic. and products are represented by the G which shows the difference between the energy of the reactants and products.

Answer:

C.) G

Explanation:

:p

Answer:

The correct option is;

b. How high the barbell is being lifted

Explanation:

The work done in lifting the 160 N barbell is equal to the potential energy gained by the barbell in the final elevated position of the barbell

Therefore, in order to find the work done to lift the barbell, we can calculate the potential energy gained by the barbell when it is placed at height

The work done to lift the barbell = The potential energy, P.E., gained by the barbell

The potential energy of an object, P. E. = The mass of the object, m × The acceleration due to gravity, g × The height to which the barbell is lifted, h

∴ Mathematically, P.E. = m × g × h

Weight, W = Mass, m × The acceleration due to gravity, g

The weight, W of the barbell is given as W = 160 N

∴ W = m × g = 60 N

From which we have;

P.E. = m × g × h = W × h

∴ The work done to lift the barbell = P.E. = 60 N × h = 60 N × The height to which the barbell is lifted.

Therefore the information which need be known is the height to which the barbell.