although acceleration usually causes a change in speed what causes a change in direction?
A.centripetal force
B.angular velocity
C.radian(rad)
D.centripetal acceleration

Answer:

400 Hz

Explanation:

The frequency of a sound wave is found by the velocity/wavelength.  Therefore, f = v/wavelength = (200 m/s)/(0.5 m) = 400 Hz

I hope this helps! :)

Answer:

The angle from vertical of the axis of the second polarizing filter is 50.57⁰.

Explanation:

Given;

intensity of the unpolarized light, I₀ = 300 W/m²

intensity of emergent polarized light, I = 121 W/m²

let the angle from vertical of the axis of the second polarizing filter = θ

Apply Malus's law, intensity of emergent polarized light is given as;

I = I₀Cos²θ

[tex]Cos^2 \theta = \frac{I}{I_o} \\\\Cos^2 \theta =\frac{121}{300} \\\\Cos^2 \theta =0.4033\\\\Cos \theta = \sqrt{0.4033} \\\\Cos \theta = 0.6351\\\\\theta = Cos^{-1} (0.6351)\\\\\theta = 50.57 ^0[/tex]

Therefore, the angle from vertical of the axis of the second polarizing filter is 50.57⁰.

Answer:

[tex]y = 4.36[/tex]

Explanation:

Let the height of the ladder be L

[tex]L = 10[/tex]

Also:

When the ladder leans against the wall, it forms a triangle and the length of the ladder forms the hypotenuse.

So, we have:

[tex]L^2 = x^2 + y^2[/tex] --- Pythagoras Theorem

When the base is 9ft from the wall, this means that:

[tex]x = 9[/tex]

Substitute 9 for x and 10 for L in [tex]L^2 = x^2 + y^2[/tex]

[tex]10^2 = 9^2 + y^2[/tex]

[tex]100 = 81 + y^2[/tex]

Make [tex]y^2[/tex] the subject

[tex]y^2 = 100 - 81[/tex]

[tex]y^2 = 19[/tex]

Make y the subject

[tex]y = \sqrt{19[/tex]

[tex]y = 4.36[/tex]

Hence, the true distance at that point is approximately 4.36ft

The true statement about the true distance between the top of the ladder and the ground when the base is 9 feets from the wall is - 9/√19

Let :

Ladder forms a right angle triangle as it leans against the wall :

Hence, we have :

Taking the implicit derivative of both sides:

2xdx/dt + 2ydy/dt = 0

xdx/dt + ydy/dt = 0

ydy/dt = - xdx/dt

dy/dt = (-xdx/dt) / y

When the ladder is 9 ft from the wall;

81 + y² = 100

y² = 100 - 81 = 19

y = √19

Substituting into the equation :

dy/dt = -9(1)/√19

Hence, dy/dt = - 9/√19

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Answer:

the answer is PHOTOSYNTHESIS..

Explanation:

photosynthesis is the process when plants make their food from taking energy from the sun creating sugar.

Answer:

Explanation:

To convert Celsius to Fahrenheit, use the following formula;

= (°C * 9/5) + 32

= (453 * 9/5) + 32

= 847.4 °F

To convert Celsius to Kelvin, use the following;

= °C + 273.15

= 453 + 273.15

= 726.15K

Answer:

The pole stores elastic potential energy when the pole is bent because its shape is change from its natural shape and it will want to go back to its original form, just like a spring or stretched elastic material.

Question:

Why did you lie about being in college?

Answer:

The pole stores gravitational potential energy because it is bent from its natural shape when off the ground.

Explanation: i took the test

Answer:

As frequency increases, wavelength decreases

Explanation:

Both quantities are inversely proportional

Answer:

Conservation of momentum

Explanation:

Out of the two options given, the more appropriate one is the law of conservation of momentum. This is particularly so because momentum deals with the velocity or speed of the car while considering its mass. So, if a large car is to collide with another car, small one, then the momentum is what is considered. Energy on the other hand is talking about the work that is done, while the momentum considers the mass of the car while it is moving and considering its speed also

Answer:

A) 7kg

B) 0.044

Explanation:

a) Accordimg to Newton's second law

\sum F = ma

Fm - Ff = ma

Fm is moving force =15-5 = 10N

Ff is fictional force = 3N

m is the mass = ?

a Is the acceleration = 1m/s²

Substitute

10-3 = 1m

7 = m

Hence the mass of the body is 7kg

b) coefficient of friction is expressed as;

n = Ff/R

R is the reaction = mg

n =Ff/mg

Substitute

n = 3/7(9.8)

n = 3/68.6

n = 0.044

Hence the coefficient of friction is 0.044

Answer:

b. 40 ms

Explanation:

A wave travels at a speed of 20 m/s

the wavelength is 0.800 m

Required

the period

The expression for the velocity of a wave is given as

[tex]v=f \lambda\\\\f= v/ \lambda\\[/tex]

substituting our data

[tex]f= 20/0.8\\\\f=25Hz[/tex]

But T=1/f

T=1/25

T=0.04s

T=40ms

A)Linear motion

If there is not net force on the car, then by the Newton Second Law, the acceleration is zero, and the only valid option for zero acceleration is A).

Answer:

400cos(60) = 200m/s

100(v) = 0.035(200)

v= 0.07m/s

Answer:

Explanation:

Force of friction acting on the body = μ mg cosθ

= .4  x 70 x 9.8 x cos30

= 237.63 N

component of weight = mgsinθ

= 70 x 9.8 x sin30

= 343 N  

Net upward force = 600 - mgsinθ - μ mg cosθ

= 600 - 343 - 237.63

= 105.37 N

acceleration in upward direction = 105.37 / 70

= 1.5 m /s²

s = ut + 1/2 a t²

= 0 + .5 x 1.5 x 3²

= 6.75 m .

The crate will move at a distance of 1.215 m in 3 seconds.

Given that the mass m of the crate is 70 kg and the angle above the horizontal is 30°. External force F on the crate is 600 N and the coefficient of friction is 0.4.

The friction force applied to the crate is calculated as given below.

Friction force = [tex]\mu mgcos \theta[/tex]

Where [tex]\mu[/tex] is the friction constant, g is the gravitational acceleration and [tex]\theta[/tex] is the angle above the horizontal.

Friction Force = [tex]0.4\times 70\times 9.8\times cos30^\circ[/tex]

Friction force = 237.63 N.

There is a force applied on the crate due to its weight is calculated as given below.

Force (weight component) = [tex]mgsin\theta[/tex]

Force (weight component) = [tex]70\times 9.8\times sin 30^\circ[/tex]

Force (weight component) = 343 N.

The net force applied to the crate is given below.

Net force = External force - friction force - force (weight component)

Net force F' = [tex]600 - 237.63 - 343[/tex]

Net force F' = 19.37 N.

The acceleration of the crate can be calculated as given below.

[tex]a = \dfrac {F'}{m}[/tex]

[tex]a =\dfrac {19.37}{70}[/tex]

[tex]a = 0.27 \;\rm m/s^2[/tex]

Hence the distance traveled by the crate in 3 seconds is calculated by the formula given below.

[tex]s = ut + \dfrac {1}{2} at^2[/tex]

Where, s is the distance, u is the initial velocity, a is the acceleration and t is the time of motion of the crate.

[tex]s = 0\times 3 + \dfrac {1}{2} \times 0.27 \times 3^2[/tex]

[tex]s = 1.215[/tex]

Hence we can conclude that the crate will move a distance of 1.215 m in 3 seconds.

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Answer:

[tex]0.75623\ \text{kN/m}[/tex]

[tex]55.6\ \text{cm}[/tex]

Explanation:

m = Mass of object = 7.94 kg

g = Acceleration due to gravity = [tex]9.81\ \text{m/s}^2[/tex]

x = Change in length of the spring = [tex](42.4-32.1)\ \text{cm}[/tex]

F = Force on the spring

Force of gravity on the object and the force on the spring will be equal

[tex]mg=kx\\\Rightarrow k=\dfrac{mg}{x}\\\Rightarrow k=\dfrac{7.94\times 9.81}{0.424-0.321}\\\Rightarrow k=756.23\ \text{N/m}[/tex]

The spring constant is [tex]756.23\ \text{N/m}=0.75623\ \text{kN/m}[/tex]

F = 178 N

Force on spring is given by

[tex]F=kx\\\Rightarrow x=\dfrac{F}{k}\\\Rightarrow x=\dfrac{178}{756.23}\\\Rightarrow x=0.235\ \text{m}=23.5\ \text{cm}[/tex]

The length of the spring will be [tex]32.1+23.5=55.6\ \text{cm}[/tex].

Answer:

Both are subject to a persons interpretation

Explanation:

We hear people describe this when somebody is making an irresistible sound. usually people say the baby has a pitch scream.

Answer:

An atom of sodium (Na) donates one of its electrons to an atom of chlorine (Cl) in a chemical reaction, and the resulting positive ion (Na+) and negative ion (Cl−) form a stable ionic compound (sodium chloride; common table salt) based on this ionic bond.

Explanation:

All the info i can give you

Answer:the nucleus controls and regulates the activities of the cell

Explanation:trust me bro

Answer:

The nucleus controls and regulates the activities of the cell and carries the genes, structures that contain the hereditary information.

Answer:

I would choose refrigerator.

Explanation:

In my opinion, such a battery could be invented by changing the device as a low power mode. Plus, it is a must in order to decrease the CFC gas spreading through the atmosphere. That's all, thank you.

hhhhuuuxuuuudddddddddddd

Answer:

6480kg/m³

Explanation:

Specific gravity is expressed as;

S = density of substance being measured/Density of the reference sample

Reference sample is the saturated soil

Density of the saturated soil = Mass/Volume

Density of the saturated soil = 2400/1

Density of the saturated soil = 2400kg/m³

Given

Specific gravity = 2.70

Get the dry density of the soil

Dry density of the soil = Specific gravity * Density of the saturated soil

Dry density of the soil = 2.70 * 2400

Dry density of the soil = 6480kg/m³

Hence the dry density of the soil is most nearly 6480kg/m³

Answer:

Answer:

because Hydropower is fueled by water, so it's a clean fuel source, meaning it won't pollute the air like power plants that burn fossil fuels, such as coal or natural gas. Hydroelectric power is a domestic source of energy, allowing each state to produce their own energy without being reliant on international fuel sources.

Explanation:

please mark as brainlest

Answer:

because the cohesive forces within the drops are stronger than the adhesive forces between the drops and the wax. Water wets glass and spreads out on it because the adhesive forces between the liquid and the glass are stronger than the cohesive forces within the water.

Answer:

the adhesive forces between the drops are stronger than cohesive force between the liquid

Answer:

For example, a physical change does not result in the formation of new substances. Physical changes alter only the size, shape, form or matter state of a material. Water boiling, melting ice, tearing paper, freezing water and crushing a can are all examples of physical changes.

Explanation:

Answer:

b.

Explanation:

Answer:

A it makes sense

Explanation:

The best description of an atom is that it is  A very small particle that holds a positive or negative charge, depending upon the element. Hence, option A is correct.

The smallest unit of matter that can be divided with releasing charged particles is the atom. It is also the smallest bit of matter with chemical substance properties. As a result, the atom is the basic building block of chemistry.

Examine the many-electron-electron arrangements in the electron shells around the atom's nucleus.

A large portion of a molecule is empty space. The remainder of the structure, which is composed of neutrons and protons, is surrounded by a cloud of negatively charged electrons, while the nucleus itself has a positive charge.

Therefore, for an atom, the best description is that it is a very small particle that hold charge depending on the element.

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Answer:

 v = 1.078 10⁴ m / s

Explanation:

To solve this exercise we can use conservation of mechanical energy

Starting point. Just clearing

          Em₀ = K + U = ½ m v² - G m M / [tex]R_{e}[/tex]

Final point. At r = 14R_{e}

        Em_{f} = U = -G m M / 14R_{e}

how energy is conserved

         Em₀ = [tex]Em_{f}[/tex]

         ½ m v² - G m M /R_{e} = -G m M / 14R_{e}

        ½ v² = G M / R_{e} (-1/14 + 1)

        v² = 2 G M / R_{e} 13/14

we calculate

       v² = 2 6.67 10⁻¹¹ 5.98 10²⁴ / 6.37 10⁶ 13/14

       v = √ (1,16 10⁸)

       v = 1.078 10⁴ m / s

The launch speed of a projectile that rises above the earth will be

v = 1.078 10⁴ m / s

Speed is defned as the movement of any object with respect to the time the formula of speed is given as the ratio of the distance with time.

To solve this exercise we can use conservation of mechanical energy

Starting point. Just clearing

[tex]E_{mo} = K + U = \dfrac{1}{2}m v^2 - \dfrac{G m M} { r}[/tex]

Final point. At[tex]r = 14R_{e}[/tex]

 [tex]Em_{f} = U = \dfrac{-G m M }{14R_{e}}[/tex]

how energy is conserved

 [tex]E_{mo }= \dfrac{1}{2} m v^2 -\dfrac{-G m M }{R_{e}} = \dfrac{-G m M }{ 14R_{e}}[/tex]

  [tex]\dfrac{1}{2} v^2 = \dfrac{G M }{ R_{e} (\dfrac{-1}{14} + 1)}[/tex]

    [tex]v^2 = \dfrac{2 G M} { R_{e} \dfrac{13}{14}}[/tex]

we calculate

[tex]v^2 = \dfrac{2 6.67 \times10^{-11}\times 5.98 \times 10^{24}} { 6.37 \times 10^{6} \times \dfrac{13}{14}}[/tex]

  [tex]v = \sqrt{ (1,16\times 10^8)}[/tex]

  v = 1.078 10⁴ m / s

Hence the launch speed of a projectile that rises above the earth will be

v = 1.078 10⁴ m / s

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Answer:

875.59 N/m

Explanation:

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

Force (F) = 10 lb

Extention (e) = 2 in

Spring constant (K) =?

Next, we shall convert 10 lb to Newton (N). This can be obtained as follow:

1 lb = 4.448 N

Therefore,

10 lb = 10 lb × 4.448 N / 1 lb

10 lb = 44.48 N

Thus, 10 lb is equivalent to 44.48 N

Next, we shall convert 2 in to metre (m). This can be obtained as follow:

1 in = 0.0254 m

Therefore,

2 in = 2 in × 0.0254 m / 1 in

2 in = 0.0508 m

Thus, 2 in is equivalent to 0.0508 m.

Finally, we shall determine the spring constant i.e the stiffness of the spring as follow:

Force (F) = 44.48 N

Extention (e) = 0.0508 m.

Spring constant (K) =?

F = Ke

44.48 = K × 0.0508

Divide both side by 0.0508

K = 44.48 / 0.0508

K = 875.59 N/m

Therefore the spring constant i.e the stiffness of the spring is 875.59 N/m

Answer:

1. far

2. a couple of seconds

3.  a mile or so

Explanation:

The box is accelerated from rest to 4 m/s in a matter of 2.5 s, so its acceleration a is such that

4 m/s = a (2.5 s)   →   a = (4 m/s) / (2.5 s) = 1.6 m/s²

Then the force applied to the box has a magnitude F such that

F = (10 kg) (1.6 m/s²) = 16 N

P(W) = E(J) / t(s)

50/25=2