PLEASE IM TIMED

If total mechanical energy = kinetic energy + potential energy, TME = KE + PE, and a roller coaster has 500 J of total mechanical energy. At the very beginning of the track the roller coaster has 500 J of potential energy, how much kinetic energy is there at the beginning of the track?

Answer:

Explanation:

Focal length (f) can be defined as the distance from the focal point to the centre of the surface of the mirror.

While radius of curvature (r) is the radius of the sphere of which the mirror forms a part.

Hence the relationship between the two is that the focal length is half of the length of the radius of curvature.

Mathematically,

F = r/2

Answer:

Explanation:

The mass of an object can be found by using the formula

[tex]m = \frac{f}{a} \\ [/tex]

f is the force

a is the acceleration

From the question we have

[tex]m = \frac{56}{7} \\ [/tex]

We have the final answer as

Hope this helps you

Answer:

8 kg*m/s  (8 kg)

Explanation:

f= 56 N

a= 7 m/s^2

m= ?

m= 56 N / 7 m/s^2

= 8 kg*m/s

(8 kg)

Answer:

the rock breaks down when the wind blows particles of sand against it.

Explanation:

because the sand can easily be decomposed and temperature easily accessible to it cause line of weaknesses of the rock to break down

Answer:

ALUMINUM ITS ALUMINUM BRO

Explanation:

Answer:

Explanation:

Step one:

given

length of rod=2m

mass of object 1 m1=1kg

let the unknown mass be x

center of mass c.m= 1.6m

hence 1kg is 1.6m from the c.m

and x is 0.4m from the c.m

Taking moment about the c.m

clockwise moment equals anticlockwise moments

1*1.6=x*0.4

1.6=0.4x

divide both sides by 0.4 we have

x=1.6/0.4

x=4kg

The mass of the other object is 4kg

Answer:

a)   I = 3.63 W / m² , b)   I = 0.750 W / m²

Explanation:

The intensity of a sound wave is given by the relation

         I = P / A = ½ ρ v (2π f [tex]s_{max}[/tex])²

         I = (½ ρ v 4π² s_{max}²) f²

a) with the initial condition let's call the intensity Io

        cte = (½ ρ v 4π² s_{max}²)

         I₀ = cte s² f₀²

        I₀ = cte 10 6

If frequency is increase f = 2.20 10³ Hz

         I = constant (2.20 10³) 2

         I = cte 4.84 10⁶

let's find the relationship of the two quantities

        I / Io = 4.84

        I = 4.84 Io

        I = 4.84 0.750

        I = 3.63 W / m²

b) in this case the frequency is reduced to f = 0.250 10³ Hz and the displacement s = 4 s or

        I = cte (f s)²

        I = constant (0.250 10³ 4)²

        I = cte 1 10⁶

the relationship

        I / Io = 1

        I = Io

        I = 0.750 W / m²

Answer:

it's B for a pe x

Explanation:

Answer:

Explanation:

F

Answer:

25%

Explanation:

use F=mg

then use the answer you get from that and plug it into W=Fxh

take that answer and divide it by 400 J and multiply by 100

round to sig figs

Answer:

Explanation:

Using the pythagoras theorem, the displacement is expressed as;

d² = x²+y²

y = 36m (north)

x = 20m east

Substitute;

d² = 36²+20²

d² = 1296+400

d² = 1696

d = √1696

d = 41.18m

For the direction;

theta = tan^-1(y/x)

theta = tan^-1(36/20)

theta = tan^-1(1.8)

theta = 60.95°

Hence the magnitude is 41.18m and the direction is 60.95°

Scientists are choosing to colonize Mars rather than another planet out of curiosity, the potential for humans to provide more in-depth observational research than uncrewed rovers, economic interest in its resources, and the possibility that the settlement of other planets could decrease the likelihood of human extinction.

Colonization requires the establishment of permanent habitats that have the potential for self-expansion and self-sustenance.

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Answer:

E.P.E = 1.27 x 10⁻⁴ J = 0.127 mJ

Explanation:

From Law of Conservation Energy, we know that:

Elastic Potential Energy Stored = Gain in Kinetic Energy + Gain in Gravitational Potential Energy

E.P.E = (1/2)mv² + mgh

where,

E.P.E = Elastic Potential Energy = ?

m = mass of flea = 0.1 g = 1 x 10⁻⁴ kg

v = speed = 1.25 m/s

g = 9.8 m/s²

h = height = 5 cm = 0.05 m

Therefore,

E.P.E = (1/2)(1 x 10⁻⁴ kg)(1.25 m/s)² + (1 x 10⁻⁴ kg)(9.8 m/s²)(0.05 m)

E.P.E = 0.78 x 10⁻⁴ J + 0.49 x 10⁻⁴ J

E.P.E = 1.27 x 10⁻⁴ J = 0.127 mJ

Solution :

The moment of inertia for a circular disc about its centre is given by

[tex]$I=\frac{mr^2}{2}$[/tex]

Given , radius of CD, [tex]$r=\frac{d}{2}$[/tex]

[tex]$r=\frac{1.5 \times 10^{-2}}{2}$[/tex]

  [tex]$=7.5 \times 10^{-2} \ m$[/tex]

A).

The moment of inertia of CD about its centre is

[tex]$I_{centre}=\frac{mr^2}{2}$[/tex]

          [tex]$=\frac{25 \times 10^{-3}\times (7.5 \times 10^{-2})^2}{2}$[/tex]

          [tex]$= 7\times 10^{-5} \ kg \ m^2$[/tex]

B).

The moment of inertia about parallel axis of CD with respect to its central axis is given by the parallel axis theorem,

[tex]$I_{p}=I_c + md^2$[/tex]

where, d is the distance between the parallel axis and central axis

Therefore, moment of inertia of CD about its edge is

[tex]$I_p=I_c +md^2$[/tex]

   [tex]$=\frac{mr^2}{2}+mr^2$[/tex]

   [tex]$=\frac{3}{2}mr^2$[/tex]

   [tex]$=\frac{3(25 \times 10^{-3})\times (7.5 \times 10^{-2})^2}{2}$[/tex]

   [tex]$=2.1 \times 10^{-4} \ kg \ m^2$[/tex]

(a) The  CD's moment of inertia for rotation about a perpendicular axis through its center is [tex]7.031 \times 10^{-5} \ kgm^2[/tex]

(b) The CD's moment of inertia for rotation about a perpendicular axis through the edge of the disk is [tex]2.11 \times 10^{-4} \ kgm^2[/tex]

The given parameters;

(A) The  CD's moment of inertia for rotation about a perpendicular axis through its center is calculated as follows;

[tex]I_c = \frac{1}{2} mr^2\\\\I_c = \frac{1}{2} \times 0.025 \times (0.075)^2\\\\I_c = 7.03 1 \times 10^{-5} \ kgm^2[/tex]

(B) The CD's moment of inertia for rotation about a perpendicular axis through the edge of the disk is calculated as;

[tex]I_p = I_c + mr^2\\\\I_p = (7.031 \times 10^{-5}) \ + \ 0.025 \times (0.075)^2\\\\I_p = 2.11 \times 10^{-4} \ kgm^2[/tex]

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Answer: 10595 J

Explanation: cK-12 Potential Energy

The gravitational potential energy gained by Sara if she has a mass of 60 kg and the distance of the journey is 18 meters is 10584 Joules.

The potential energy that a huge item has in relation to another massive object due to gravity is known as gravitational energy or gravitational potential energy. When two objects descend toward one another, the potential energy associated with the gravitational field is released (transformed into kinetic energy). Bringing two things farther apart increases the gravitational potential energy.

Given:

The distance of the journey, d = 18 meters,

The mass of Sara, m = 60 kg,

Calculate the potential energy by the following formula,

PE = m × g × d

Here, PE is the potential energy and g is gravitational acceleration,

Substitute the values,

PE = 60 × 18 × 9.8

PE = 10584 Joules

Therefore, the gravitational potential energy gained by Sara if she has a mass of 60 kg and the distance of the journey is 18 meters is 10584 joules.

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Answer: u failed both sad welp ill try to help

Explanation:

Answer:

Increases with time via the relationship:

velocity = acceleration * time = g * t

Explanation:

Since the object is falling under the constant acceleration due to gravity, its velocity is increasing with time. Such relationship can be described via the equation:

velocity = acceleration * time = g * t

Where the direction of the acceleration due to gravity (g) (pointing downwards) is in the same direction of that of the object's velocity.

Answer:

Conditions for Superconductivity

The material must be cooled below a characteristic temperature, known as its superconducting transition or critical temperature (Tc). ... The magnetic field to which the material is exposed must be below a characteristic value known as the critical magnetic field (Hc).

Answer:

B) brittle

Explanation:

This describes most covalent compounds.

Answer:

B.)

Explanation:

The atoms can be of the same element or different elements. In each molecule, the bonds between the atoms are strong but the bonds between molecules are usually weak. This makes many solid materials with covalent bonds brittle.

Answer:

1.5 x 10¹⁸hz

Explanation:

Given parameters:

Wavelength  = 2 x 10⁻¹⁰m

Unknown:

Frequency   = ?

Solution:

To find the frequency, use the expression below;

  V  = f x wavelength

V is the speed of light = 3 x 10⁸m/s

f is the frequency

Now;

 Insert the parameters

     3 x 10⁸  = 2 x 10⁻¹⁰ x frequency

   Wavelength = [tex]\frac{3 x 10^{8} }{2 x 10^{-10} }[/tex]    = 1.5 x 10¹⁸hz

Answer: 17.3rad/secs.

Explanation:

Given data:

m = 2.0kg

f = 45N

radius of the disk = 1.5m

Solution:

First we determine the kinetic energy of the the system

= 1/2jw^2 + 1/2m(wR)^2

when the brick falls at wR m/s

= 1/2( j + mR^2)w^2

= 1/2 (1/2MR^2 + mR^2)w^2

Loss in potential energy when the brick drops

= 5rad * 1.5m

= 7.5m

Therefore;

45N * 7.5m = 1/2Iw^2

where;

I = 1/2mr^2

angular speed

w = √4*45*7.5/(2*1.5^2)

= 17.3rad/secs

Three elements are required to create an electric current: a supply of freely flowing electric charges (electrons), some kind of push to move the charges across the circuit, and a path to carry the charges.

Electrical energy is a type of energy that is related to forces on electrically charged particles and electrically charged particle motion (often electrons in wires, but not always). Electric current and electric potential, which is also known as voltage because it is measured in volts, are delivered via an electrical circuit to provide this energy.

When charged particles and a voltage difference combine, as in static electricity or a charged capacitor, motion (current) is not necessary. Instead, the moving electrical energy is often transformed into another kind of energy.

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Answer:

true

Explanation:

Answer:

answers, the correct one is b

Explanation:

For this problem we use the fact that since the ends are open at these points we have a maximum,

fundamental L =λ/2 λ = 2L

second harmonic L = λ λ = 2L / 2

third harmonic L = 3 λ/2 λ = 2L / 3

n harmonic lam = 2L / n

 with n an integer

therefore the length of the first three harmonics are: 2L, L, 2L / 3

when examining the different answers, the correct one is b

Answer:

Explanation:

The force acting on an object given it's mass and acceleration can be found by using the formula

force = mass × acceleration

From the question we have

force = 15 × 3.6

We have the final answer as

Hope this helps you

Answer:

It curves inward

Explanation:

Of the choices given it is the only one that makes sense

Considering the concave mirror to be a part of a large sphere and the outer surface polished, we can say it curves inward.

There are three types of mirrors: plain mirrors, convex mirrors, and concave mirrors.

The plain mirrors are the ones which we use in our houses. It has both the sides flat, front and back. With the back end polished to reflect light.

It is obvious that the back end of the mirror must be silvered or polished in order to reflect light.

In the case of concave mirrors, if we consider it a part of a large sphere, then the outer surface is silvered or polished and the inner surface is the surface that is used as a mirror,

So, we can say that a concave mirror curves inward.

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Answer:

Explanation:

The mass of the car can be found by using the formula

[tex]m = \frac{f}{a} \\ [/tex]

f is the force

a is the acceleration

From the question we have

[tex]m = \frac{1850}{2.4} \\ = 770.83333...[/tex]

We have the final answer as

Hope this helps you

Answer:

The object takes 3.84 seconds to return to earth.

Explanation:

Projectile Motion

It's when an object projected above the ground at a certain velocity, moves along a curved path under the action of gravity.

The initial velocity has two components, given by:

[tex]v_x=vo_x[/tex]

[tex]v_y=vo_y-gt[/tex]

Where vox is the initial component of the velocity in the horizontal direction, voy is the initial component of the velocity in the vertical direction, and t is the time.

The object reaches a maximum height and then it returns to the ground. The time it takes to reach the maximum height can be calculated when the vertical component of the velocity is zero:

[tex]vo_y-gt=0[/tex]

[tex]\displaystyle t_m=\frac{vo_y}{g}[/tex]

The initial vertical component of the velocity is 18.8 m/s, thus:

[tex]\displaystyle t_m=\frac{18.8}{9.8}=1.92~s[/tex]

The total time is double that time:

[tex]t_t=2*1.92~s=3.84~s[/tex]

The object takes 3.84 seconds to return to earth.