the diagram below shows different weights on the see-saw. Will the see-saw move?

Answer:

v =  44,3 m/s

Explanation:

La velocidad la podemos hallar usando la siguiente expresión:

[tex] v_{f}^{2} = v_{0}^{2} - 2gh [/tex]

En donde:

h: es la máxima altura = 100 m

[tex]v_{f}[/tex]: es la velocidad final = 0 (en la altura máxima)

[tex]v_{0}[/tex]: es la velocidad inicial =?

g: es la gravedad = 9,81 m/s²

Resolviendo la ecuación anterior para v₀, tenemos:

[tex] v_{0} = \sqrt{2gh} = \sqrt{2*9,81 m/s^{2}*100 m} = 44,3 m/s [/tex]

Entonces, el proyectil fue lanzado hacia arriba con una velocidad de 44,3 m/s.

Espero que te sea de utilidad!                      

Final Answer:

65.25 J is the kinetic energy that the ball has.

Explanation:

M = 145g

(Reminder: kg must be used in this formula, thus we need to convert 145g to kg)

M = 145g x 1kg/1000g

(cross out g, then multiply 145 to 1kg)

M = 145kg/1000 = 0.145kg

M = 0.145 kg

V = 30.00 m/s

Solution:

KE = 1/2mv^2

KE = 1/2(0.145kg)(30.00m/s)^2

(Square first the velocity)

KE = 1/2(0.145kg)(900.00m^2/s^2)

KE = 1/2(130.5 kg*m^2/s^2)

KE = 65.25 kg*m^2/s^2

(Reminder: 1 kg*m^2/s^2 = 1 J)

KE = 65.25 J

Final Answer:

65.25 J is the kinetic energy that the ball has.

Answer:

0 I think

Explanation:

Answer:

true

Explanation:

I just had a test on this

Answer:

true

Explanation:

cause it is

Answer:

1) mechanical

2) transverse

3) medium

4) longitudinal

Explanation:

Answer:

deposition, sublimation

Explanation:

The changes of state occur between solids and gases during deposition and sublimation. The second and fifth option are correct.

The conversion of solid to gas and gas to solid directly, as in case of solid ice made of carbon di oxide.

The change of state means changing the phase of the matter with the change in temperature and pressure of the surrounding.

The vaporization change liquid to gas or solid to liquid and vice versa. Freezing is converting liquid to solid. Melting is converting from solid to liquid.

The rest phenomenon are deposition and sublimation in which phase change between solid and gas.

Thus,  second and fifth option are correct.

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i hope it helped thanks

Answer: green car and red car

Explanation:

Answer:

it is white car for the first question and for the second it goes green slowest and white fastest red is in the middle

Answer:

ok what is the question

Answer:

If the question is what is the magnitude of the final velocity of the combined cars ? Answer: 1.5 m/s

Explanation:

Answer:

answer is D.it will decrease

Answer:

D. It will decrease

Explanation: Study island ;)

Answer: an steppe climate

Explanation:

Answer:

a) El trabajo realizado por esta fuerza mientras el bloque se mueve desde la posición x = + 10 m hasta la posición x = + 20 m es 900 joules.

b) La rapidez del bloque en la posición x = + 20 metros es aproximadamente 5.701 metros por segundo.

Explanation:

a) El trabajo expermentado por el bloque ([tex]W[/tex]), medido en joules, es definida por la siguiente ecuación integral:

[tex]W = \int\limits^{x_{max}}_ {x_{min}} F(x) \, dx[/tex] (1)

Donde:

[tex]x_{min}[/tex], [tex]x_{max}[/tex] - Posiciones mínima y máxima del bloque, medidos en metros.

[tex]F(x)[/tex] - Fuerza horizontal aplicada al bloque, medida en newtons.

Si conocemos que [tex]F(x) = 6\cdot x[/tex], [tex]x_{min} = 10\,m[/tex] y [tex]x_{max} = 20\,m[/tex], entonces el trabajo realizado por esta fuerza es:

[tex]W = \int\limits^{20\,m}_{10\,m} {6\cdot x} \, dx[/tex] (2)

[tex]W = 6\int\limits^{20\,m}_{10\,m} x\, dx[/tex]

[tex]W = 3\cdot x^{2}\left|\limits_{10\,m}^{20\,m}[/tex]

[tex]W = 3\cdot [(20\,m)^{2}-(10\,m)^{2}][/tex]

[tex]W = 900\,J[/tex]

El trabajo realizado por esta fuerza mientras el bloque se mueve desde la posición x = + 10 m hasta la posición x = + 20 m es 900 joules.

b) La rapidez final del bloque se determina mediante de Teorema del Trabajo y la Energía, es decir:

[tex]W = K_{f}-K_{o}[/tex] (3)

Donde son [tex]K_{o}[/tex], [tex]K_{f}[/tex] las energías cinéticas traslacionales inicial y final, medidos en joules.

Al aplicar la definición de energía cinética traslacional, expandimos y simplificamos la ecuación como sigue:

[tex]W = \frac{1}{2}\cdot m \cdot (v_{f}^{2}-v_{o}^{2})[/tex] (4)

Donde:

[tex]m[/tex] - Masa del bloque, medido en kilogramos.

[tex]v_{o}[/tex], [tex]v_{f}[/tex] - Rapideces inicial y final del bloque, medidos en metros por segundo.

[tex]\frac{2\cdot W}{m} = v_{f}^{2}-v_{o}^{2}[/tex]

[tex]v_{f} = \sqrt{\frac{2\cdot W}{m}+v_{o}^{2}}[/tex]

Si conocemos que [tex]W = 900\,J[/tex], [tex]m = 20\,kg[/tex] y [tex]v_{o} = \sqrt{10}\,\frac{m}{s}[/tex], entonces la rapidez final del bloque es:

[tex]v_{f} = \sqrt{\frac{900\,J}{2\cdot (20\,kg)}+10\,\frac{m^{2}}{s^{2}} }[/tex]

[tex]v_{f} \approx 5.701\,\frac{m}{s}[/tex]

La rapidez del bloque en la posición x = + 20 metros es aproximadamente 5.701 metros por segundo.

Answer:

vf=79.38 m/s

y= 321.5 m

Explanation:

Free Fall Motion

A free-falling object falls under the exclusive influence of gravity. Free-falling objects do not encounter air resistance.

If an object is dropped from rest in a free-falling motion, it falls with a constant acceleration called the acceleration of gravity, which value is [tex]g = 9.8 m/s^2[/tex].

The final velocity of a free-falling object after a time t is given by:

vf=g.t

The distance traveled by a dropped object is:

[tex]\displaystyle y=\frac{gt^2}{2}[/tex]

1.

The penny will fall for t=8.1 s before hitting the ground, thus the height from which it was dropped is:

[tex]\displaystyle y=\frac{9.8\cdot 8.1^2}{2}[/tex]

y= 321.5 m

2.

The final velocity is:

[tex]vf=9.8\cdot 8.1[/tex]

vf=79.38 m/s

Answer:

The correct option is;

75 N

Explanation:

The given parameters are;

The angle of inclination of the ramp, θ = 42°

The gravitational force of the box = m × g = 112.1 N

Let [tex]F_f[/tex] represent the force of static friction acting on the box

Given that the box is at rest, we have

The component of the gravitational force acting along the inclined plane = The force of static friction acting on the box, [tex]F_f[/tex]

We have that the component of the gravitational force acting along the inclined plane = m × g × sin (θ) = [tex]F_f[/tex]

[tex]F_f[/tex] = m × g × sin (θ)

Substituting the values, gives;

[tex]F_f[/tex] = 112.1 × sin (42°) ≈ 75.0095409728

∴ The force of static friction acting on the box = [tex]F_f[/tex] ≈ 75 N

Answer:

C: 75N

Explanation:

Answer:

59.51 mph.

Explanation:

The following data were obtained from the question:

Distance (d) = 147 miles

Time (t) = 2.47 hours.

Speed (S) =?

Speed is defined as the distance travelled per unit time. Mathematically, it is expressed as:

Speed (S) = Distance (d) / time (t)

S = d/t

With the above formula, we can obtain the speed of the girl as illustrated below:

Distance (d) = 147 miles

Time (t) = 2.47 hours.

Speed (S) =?

S = d/t

S = 147 miles / 2.47 hours.

S = 59.51 miles per hour (mph)

Thus, the speed of the girl is 59.51 mph.

Answer:

Gravity always pulls the ball toward the center of earth (the ground).

Explanation:

Answer:

Explanation:

A ) Total energy of spring block system at height = kinetic energy at the bottom

= 1/2 m V²

= .5 x 2 x 2²

= 4 J

B )

height of ramp be h

mgh = 1/2 m ( v₂² - v₁² )

2 x 9.8 x h = 2² - 1.2²

19.6 h = 4 - 1.44

h = .1306 m

13.06 cm

C ) If distance between B and C be x₁

work done by friction = reduction in kinetic energy

= μ mg x₁ = 1/2 m ( 2² - 1.4² )

.3 x 9.8 x₁ = 1.02

x₁ = 34.7 cm

D )

If distance between C and D be x₂

work done by friction = reduction in kinetic energy

= μ mg x₂ = 1/2 m ( 1.4² - 0 )

.3 x 9.8 x₂ = .98  

x₂ = 33.33 cm

E )

Total work done by friction

= 1/2 m v² - 0 , v = 2 m /s

= .5 x 2 x 2²

= 4 J .

F )

Mechanical energy of the system at E = 0

G ) 1/2 k x² = 1/2 m v²

kx = 50 N , where x is compression and k is spring constant

k²x² / 2k = 1/2 m v²

50² / k = 2 x 1.2²

k = 868.05 N / m

H ) kx = 50

x = 50 / k

= 50 / 868.05

= 5.76 cm .

Answer:

36cm

Explanation:

Answer: because there is no displacement or movement in the watchman's work. According to science when displacement or movement take place it is said to be work. Jul 9, 2020

Hope it helps!

Answer:

C-objects with balanced forces remain un changed

Explanation:

because the forces that act on the body cancel each other and the net force=0

Answer:

Graph-

Explanation:

The graph best shows the velocity v of the clay ball from when it is dropped until it hits the ground is attached below.

Velocity is the time rate of change of displacement. The displacement and velocity both are vector quantities. They represent magnitude and direction as well.

Irene drops a clay ball at time t=0. The ball stops when it hits the ground.

When the clay ball drops, only force acting is due to acceleration due to gravity.

The velocity of the clay ball decreases with the time.

Thus, the graph best shows the velocity v of the clay ball from when it is dropped until it hits the ground is attached.

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Answer:

Anxiety

Explanation:

Answer:

anxiety disorder

Explanation:

just took the quiz

Answer:

the answer is k.E =0.5

Explanation:

i only think about it and i answer it

Answer:

First one

It has 3 orbital

The diagram first represents an atom from period three of the modern periodic table.

There are seven periods and 18 groups in the periodic table where each element is arranged on the basis of its increasing atomic number.

The atom represents in the diagram first is known as the sodium element. The atomic number of sodium is 11. Its electronic configuration is 2, 8, and 1. It requires three shells for the distribution of electrons. Apart from sodium, other members of period three include magnesium, aluminum, Silicon, Phosphorus, Sulfur, chlorine, and argon.

The diagram two represents an element of helium, while the diagram three represents an element of oxygen.

Therefore, the diagram first represents an atom from period three of the modern periodic table.

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Answer:

32 m/s².

Explanation:

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

Mass (m) of cart = 120 Kg

Radius (r) = 15 m

Velocity (v) = 22 m/s

Centripetal acceleration (a) =?

The centripetal acceleration experienced by the cart can be obtained as illustrated below:

a = v²/r

a = 22² / 15

a = 484 / 15

a = 32.27 ≈ 32 m/s²

Thus, the centripetal acceleration experienced by the cart is approximately 32 m/s².

Answer:How far is the distance?

Explanation:

Density is the mass per unit volume of any object. It is calculated by dividing the mass of an object by its volume. This is:

ρ = m/V

ρ = 4.05 g  / 12 mL

ρ = 0.3375 g/mL

OPTION A

Answer:

Explanation:

Given

final speed v = 3015ft/s

initial speed = 0m/s

Distance S = 4146m/s

Required

Time

Using the equation of motion to get the time;

S = (v+u)/2 * t

since 1m = 3.28084ft'

4146m = 3.28084 * 4146 = 13,602.36264feet

13,602.36264 = 3015+0/2 * t

13,602.36264 = 1,507.5t

t = 13,602.36264/ 1,507.5

t = 9.023 secs

Hence it will take 9.023 seconds the rescuer die the biller to strike a target