all 4 questions plz ( pls hurry)

Answer:

f = 7.11 Hz

Explanation:

Given that,

The amplitude of object in SHM, A = 0.02 m

The maximum acceleration of the object, a = 40 m/s²

We need to find the frequency of the system.

The maximum acceleration of the object in SHM is given by :

[tex]a=\omega ^2 A[/tex]

Where [tex]\omega[/tex] is angular frequency

[tex]\omega^2=\dfrac{a}{A}\\\\\omega=\sqrt{\dfrac{a}{A}} \\\\=\sqrt{\dfrac{40}{0.02}} \\\\\omega=44.721\ rad/s[/tex]

We know that,

[tex]f=\dfrac{\omega}{2\pi}\\\\f=\dfrac{44.721}{2\pi}\\\\f=7.11\ Hz[/tex]

So, the frequency of the system is 7.11 Hz.

Answer:

(a) The energy delivered by the pulse is 0.36 J

(b) the total charge that flows is 0.8 mC

Explanation:

Given;

potential difference of the electric eel, V = 450 V

current flow, I = 0.8 A

time of current flow, t = 1.0 ms = 1.0 x 10⁻³ s

(a) The energy delivered by the pulse is calculated as;

E = Pt

where;

t is time

P is power developed = IV

E = (IV)t

E = IVt

where;

I is the current

V is the potential difference

E = 0.8 x 450 x 1.0 x 10⁻³

E = 0.36 J

(b) the total charge that flows is calculated as;

Q = It

where;

I is the current

t is the time

Q = 0.8 x 1.0 x 10⁻³

Q = 0.0008  C

Q =  0.8 mC.

Answer:

Explanation:

We shall represent displacement of dog in vector form , in terms of i , j , i representing east  and  j representing north .

Dog travels 3.5 m south .

Displacement D₁ = - 3.5 j

then dog travels 8.2 m , 23.1 degree north of east

Displacement D₂ = 8.2 cos23.1 i + 8.2 sin23 j

D₂ = 8.2 cos23.1 i + 8.2 sin23.1  j

= 7.54 i + 3.22 j  

Third displacement

D₃ = - 15i

Total displacement = D₁ + D₂ + D₃

= - 3.5 j + 7.54 i + 3.22 j  -15i

= - 7.46 i - 0.28 j

Magnitude of displacement = √ ( 7.46² + .28²)

= √(55.65 + .08 )

= 7.46 m

b ) Direction of displacement

If Ф be angle , displacement makes with west direction

TanФ =  .08 / 55.65 = .00143

Ф = .082 degree south of west or almost west .

From east , this angle = 180 + .082 = 180.082 , counterclockwise .

Answer:

The relationship between Kinetic energy, mass and speed indicates that kinetic energy and mass are proportional. This proportionality implies that if the mass is doubled, its kinetic energy is doubled too. More generally, if two objects move with the same speed the most massive one has the higher kinetic energy

Explanation:

Answer:

65 N

Explanation:

m = Mass of ball = 0.42 kg

u = Initial velocity = 0

v = Final velocity = 32.5 m/s

a = Acceleration = [tex]\dfrac{v-u}{t}[/tex]

t = Time = 0.21 s

Force is given by

[tex]F=ma[/tex]

[tex]\Rightarrow F=m\dfrac{v-u}{t}[/tex]

[tex]\Rightarrow F=0.42\times \dfrac{32.5-0}{0.21}[/tex]

[tex]\Rightarrow F=65\ \text{N}[/tex]

The force that sends soccer ball towards the goal is 65 N.

Answer:

heat

answer already there but yea just for da points

Answer: the man can power 2 incandescent light bulbs

Explanation:

Given that;

power produced by the body while riding = 500 W

Efficiency of generator = 40% = 0.4

First we need to convert the mechanical energy to electric energy;

which efficiency of generator multiply by power input, so

⇒ 0.4 × 500 = 200 W

Now, if 1 incandescent light bulbs is 100 W

x incandescent light bulbs bulbs is 200 W

100x W= 200 W

x = 200 W / 100 W

x = 2

Therefore, the man can power 2 incandescent light bulbs

Answer:

| w | = w√ ( sin^2 ∝ + cos^2∝ ) shows that w is independent of time hence it is constant

Explanation:

prove that the magnitude of w is constant

attached below is a detailed solution of the question

Answer:George Washington

Explanation:On April 30, 1789, George Washington, standing on the balcony of Federal Hall on Wall Street in New York, took his oath of office as the first President of the United States.

Answer:

George Washington

Explanation:

Hope this helps out

Answer:

This is a synthesis reaction because two substances react to produce one substance.

Explanation:

Got it straight off plato.

Answer:

This is a synthesis reaction because two substances react to produce one substance.

Explanation:

Answer:

its A

Explanation:

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Answer:

Power

Explanation:

Power, by definition, is the rate of doing work (aka, work with respect to time).

Answer:

P = 23400 [kg*m/s]

Explanation:

Momentum is defined as the product of force by the time of force duration. It can be determined by means of the following equation.

[tex]P=F*t[/tex]

where:

P = momentum [kg*m/s]

F = force = 2600 [N]

t = time = 9 [s]

Now replacing:

[tex]P=2600*9\\P=23400 [kg*m/s][/tex]

Answer:

(a) 0.748 J

(b) 2.245 J

(c) 3.74 J

(d) 4.482 W

Explanation:

(a) Work done  W = Force × distance

W = F×d,

Where d = 1/2(at²)

Therefore,

W =1/2(F×at²)................ Equation 1

Where a = acceleration, t = time.

But,

a = F/m...................... Equation 2

Where m = mass.

Substitute equation 1 into equation 2

W = 1/2(F²t²/m)................. Equation 3

Given: F = 6.7 N, t = 1 s, m = 30 kg

Substitute into equation 3

W₁ = 1/2(6.7²×1²/30)

W = 0.748 J.

(b) Similarly,

The work done in the second seconds is

Where t₂ = 2 s

W₂ = 1/2(F²t₂²/m)- W₁

W = 1/2(6.7²×2²/30)-0.748

W = 2.245 J

(c) The work done in the third seconds is

Where t₃ = 3 s

W₃ = 1/2(F²t₃²/m)-(W₂+W₃)

W = 1/2(6.7²×3²/30)-(2.993)

W = 3.74 J.

(d) P = Fv ............... Equation 4

Where v = velocity.

and,

v = at..................... Equation 5

Substitute equation 5 into equation 4

P = Fat................... Equation 6

Given: F = 6.7 N, a = 6.7/30 = 0.223 m/s², t = 3 s

Substitute into equation 6

P = 6.7×0.223×3

P = 4.482 W.

Answer:

So, I tested it out and came to a conclusion.

The rubber ball is quite bouncy due to the fact that it is made of rubber which is what makes it bounce back and high, but although the golfball does in fact bounce back it does not bounce as high as the rubber ball due to the fact that it is made of plastic.

Explanation:

Hope this helps you out!

Answer: Angle is 18.66°

Explanation: When an incident light passes through two different media, the ray of light is refracted. Refraction is the bending of the light that happens when the wave changes its velocity while passing through a different surface.

The incident light makes an angle with the normal to the surface at a point. This angle is called Angle of Incidence. After going through the other medium, the wave makes a different angle with the normal. That angle is called Angle of Refraction.

Light changes velocity when passing through different media because each material has different index of refraction. For air, index of refraction is n = 1.

The incident angle, the refracted angle and index of refraction is related by the following formula, known as Snell's Law:

[tex]n_{1}sin\theta_{1}=n_{2}sin\theta_{2}[/tex]

where

n₁ is index of refraction of the incident medium

θ₁ is angle of incidence

n₂ is index of refration of the refracted medium

θ₂ is angle of refraction

For the ray of light incident from air into a diamond, the angle of refraction is

[tex]sin\theta_{2}=\frac{n_{1}sin\theta_{1}}{n_{2}}[/tex]

[tex]sin\theta_{2}=\frac{1*sin70}{2.42}[/tex]

[tex]sin\theta_{2}=0.32[/tex]

[tex]\theta_{2}=arcsin 0.32[/tex]

[tex]\theta_{2}=[/tex] 18.66

The angle light makes in the diamond is 18.66°.

Explanation:

Remember Newton's Second law

[tex]F = ma[/tex]

We can use this to solve for the force exerted by the tree on the car when it stops the car.

We aren't given the acceleration directly in the problem statement, but we can solve for acceleration.

Recall that acceleration is the change is velocity per unit time. [tex]a = \frac{\Delta v}{\Delta t}[/tex]

We know the original velocity as 21.1 m/s and the final velocity as 0.0 m/s. The time that it takes to stop the car is 0.22 seconds.

Now we can solve using the equation. [tex]F = \frac{21.1 - 0.0}{0.22} * 365[/tex]

Answer:

it's true

Explanation:

A strong body allows you to perform movements and activities that require power without getting tired.

Answer:

because it’s on the bottom, and to get to that part of it, think of it like that scene from moana when they go down into the realm of monsters they go through the thick parts to get to the thin parts, soo the cube wouldn’t be nearly able to reach that level

Explanation:

Answer:

the red at the bottom should not count, but the red at the top is the least dense because it floats upon the other liquids

Explanation:

hope this helps

Answer:

v = 108 m/s.

Explanation:

Given that,

The position of a particle moving on a straight line is given by :

[tex]X =12 + 18t + 9t^2[/tex]

We need to find the instantaneous velocity at  t=5s.

Velocity, [tex]v=\dfrac{dX}{dt}[/tex]

So,

[tex]v=\dfrac{d(12 + 18t + 9t^2)}{dt}\\\\=18+18t[/tex]

Instantaneous velocity at t = 5 s will be :

v = 18+18t

v = 18+18(5)

= 18 + 90

= 108 m/s

So, the instantaneous veloctiy at  t=5s is 108 m/s.

Answer:

b)   d = 997.9 m ,  c) D = (952.9 i ^ +45 k ^) m ,  D = 953.6 m and θ = 2.7º

Explanation:

In this exercise we must add the distance traveled, remembering that the displacement is a vector and the distance a scalar.

a) The displacement scheme is the woman walks in her building A to descend to the lower floor 4.0 m, we assume that this includes the vertical displacement, until reaching the street level, the displacement is vertical in this part.

Being on the street, she travels the 6.5 blocks to reach the building where she works, they indicate that each block is 146.6 m, this movement is horizontal.

Upon reaching building B, she goes up to his office on the 14th floor where she travels 5.5m on each floor, it is assumed that the distance to go up to the upper floor is included, this displacement is vertical

b and c) Let's find the distance traveled and the displacement

in building A

                          Zₐ = 8 * 4.0

                          Zₐ = -32.0 m k ^

the vector k ^ indicates that the displacement is vertical and the negative sign that it is descending

on the street

                        [tex]X_{ab}[/tex] = 6.5 146.6

                        X_{ab} = 952.9 m i ^

the vector i ^ indicates that the displacement is the x-axis, we assume that the axis is in the direction of the displacement

in building B

                         [tex]Z_{b}[/tex] = 14 * 5.5

                         Z_{b} = 77 m k ^

displacement in the vertical axis and in the positive direction

now we calculate the distance traveled,

               d = Zₐ + X_{ab} + Z_{b}

               d = -32 + 952.9 + 77

               d = 997.9 m

note that this value is a scalar

Let's calculate the displacement,

Z axis

           [tex]Z_{total}[/tex] = Zₐ +  Z_{b}

           Z_{total} = -32 + 77

          Z_{total} = 45 m k ^

X axis

           X_{total} = X_{ab}

           X_{total} = 952.9 m i ^

we can give the result in two ways

a) D = X_total i ^ + Z_total k ^

    D = (952.9 i ^ +45 k ^) m

b) in module form and angles

Let's use the Pythagorean theorem

     D² = [tex]X_{total}^2[/tex] + [tex]Z_{total}^2[/tex]

     D = √(952.9² + 45²)

     D = 953.6 m

We use trigonometry

     tan θ = Z / X

     θ = tan⁻¹ (Z / X)

     θ = tan⁻¹ (45 / 952.9)

     θ = 2.7º

this angle is measured from the positive side of the x axis towards the z axis

Answer:

F=65 N

Explanation:

Uniform Acceleration

When an object changes its velocity at the same rate, the acceleration is constant.

The relation between the initial and final speeds is:

[tex]v_f=v_o+a.t[/tex]

Solving for a:

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

Where:

vf  = Final speed

vo = Initial speed

a   = Constant acceleration

t   = Elapsed time

The ball is kicked from rest vo=0 to vf=32.5 m/s in t=0.21 s. Computing the acceleration:

[tex]\displaystyle a=\frac{32.5-0}{0.21}[/tex]

[tex]a=154.8\ m/s^2[/tex]

Note: We have shown this result rounded to the nearest tenth, but we kept all the decimals in a scientific calculator for further calculations.

The force needed to accelerate the soccer ball is calculated by:

F = ma

The ball has a mass of m=0.42 kg, thus:

F=0.42*154.8

F=65 N

As mentioned, this result can only be obtained by keeping full precision in the above calculations.

Answer:

Explanation:

Given parameters:

Distance covered  = 50m

Initial velocity  = 5m/s

Final velocity  = 25m/s

Unknown:

Time taken to cover the distance  = ?

Average velocity   = ?

Solution:

To solve this problem, we use the expression below:

   x  = [tex](\frac{v + u}{2}) t[/tex]  

x is the distance

v is the final velocity

u is the initial velocity

t is the time

   50 = [tex]\frac{5 + 25}{2}[/tex]  x t

   50  = 15 x t

   t  = 3.3s

Average velocity  = [tex]\frac{v + u}{2}[/tex]   = [tex]\frac{5+25}{2}[/tex]   = 15m/s

Answer:

21.54W/m²

Explanation:

Heat transferred through the material is expressed as;

Q =K∆T/∆x

Given

Thermal conductivity k = 0.035W/mK

∆T is the change in temperature = 80K

∆x is the thickness = 13cm = 0.13m

Substitute the given values into the formula

Q = 0.035(80)/0.13

Q = 2.8/0.13

Q = 21.54W/m²

Hence the heat transferred through the material is 21.54W/m²

Answer:

i didnt skip because you said not to ion even know the answer tho

Explanation:

Answer:

Na connect with chlorine because sodium is a cation that is in the alkali metal group. Sodium has a +1 charge and all it needs to do is lose a electron to become stable. This is is since Na only has one valence electron and to create a bond, it has no choice but to lose a electron.  In the alkali metal group, they are the groups that are the most reactive metals. On the other hand, chlorine is a anion that is in the halogens group. So chlorine has a -1 charge and all it needs to do is gain a electron to become stable. This is since chlorine has 7 valance electrons and needs 1 more electron to have a full outer shell.  In the halogens group, they are the groups that are the most reactive nonmetals. When sodium and chlorine create a chemical bond, they create a charge of 0 which is neutral. That's why they would connect to create a substance that is part of everything we eat.

1(-1 )+ 1(1) = 0.

Explanation:

Hope it helped!

Answer:

See the explanation below.

Explanation:

Density will remain the same since density is the relationship between mass and volume. As we can see in the equation below.

[tex]Ro=m/V[/tex]

where:

Ro = density = 2.5 [g/cm³]

m = mass [g]

V = volume [cm³]

In such a way that when the glass is broken the small fragments retain the same density ratio. That is, each fragment has a small mass and a small volume. That's why the density remains the same.

Answer:

buoyancy is the ability to float on water or other liquids. this relates to the force of gravity because the stronger that force, the more likely it is to sink.

Explanation:

Answer:

The correct answer to the question will be compass i.e compass is not a part of a DC motor. Various parts of a DC motor are coil of wire, armature, field magnets, brushes and commutator. The coil of wire plays a vital role in DC motor.

Explanation: