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astra-53 [7]
3 years ago
9

In the decreasing order of magnitude, which of the following is correct?

Physics
1 answer:
Sergio [31]3 years ago
5 0

Answer:

b. Static > sliding > rolling friction.

Explanation:

Static friction is greater than sliding friction.  It takes more force to get an object to start sliding than to keep it sliding.

Sliding friction is greater than rolling friction.  There are fewer points of contact for a round surface compared to a flat one.

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The illustration shows a crane which lifted a girder with a force of 1,200 N.
Amanda [17]
It’s D you have to times the 1200 and 40 which gives you 48,000
3 0
3 years ago
La velocidad de un tren se reduce uniformemente de 12m/s a 5m/s. Sabiendo que durante ese tiempo recorre una distancia de 100 m.
KATRIN_1 [288]

Responder:

Explicación:

Dados los siguientes datos

Valor inicial u = 12 m / s

velocidad final v = 5 m / s

Distancia S = 100 m

Necesario

aceleración del tren.

Usando la ecuación de movimiento

v² = u² + 2as

2as = v²-u²

a = v²-u² / 2s

Sustituyendo los valores dados para obtener la aceleración que tenemos;

a = 5²-12² / 2 (100)

a = 25-144 / 200

a = -119/200

a = -0,595 m / s²

Por tanto, la aceleración del tren durante este período es de -0,595 m / s²

b) Si el tren viaja a una parada desde 5 m / s, su velocidad final será cero y su velocidad inicial u será 5 m / s

Para obtener la distancia durante este período, sustituiremos u = 5 m / s, v = 0 m / sy a = -1,19 m / s² en la ecuación de movimiento anterior;

v² = u² + 2as

0² = 5²-2 (0.595) s

0 = 25-1,19 s

1,19 s = 25

s = 25 / 1,19

Responder:

Explicación:

Dados los siguientes datos

Valor inicial u = 12 m / s

velocidad final v = 5 m / s

Distancia S = 100 m

Necesario

aceleración del tren.

Usando la ecuación de movimiento

v² = u² + 2as

2as = v²-u²

a = v²-u² / 2s

Sustituyendo los valores dados para obtener la aceleración que tenemos;

a = 5²-12² / 2 (100)

a = 25-144 / 200

a = -119/200

a = -0,595 m / s²

Por tanto, la aceleración del tren durante este período es de -0,595 m / s²

b) Si el tren viaja a una parada desde 5 m / s, su velocidad final será cero y su velocidad inicial u será 5 m / s

Para obtener la distancia durante este período, sustituiremos u = 5 m / s, v = 0 m / sy a = -1,19 m / s² en la ecuación de movimiento anterior;

v² = u² + 2as

0² = 5²-2 (0.595) s

0 = 25-1,19 s

1,19 s = 25

s = 25 / 1,19

s = 21,0 m

Por lo tanto, la distancia que recorre hasta detenerse asumiendo la misma aceleración es 21.0 m

3 0
2 years ago
If you want to find stars that are just being born, where are the best places to search?.
pickupchik [31]

Answer:

In giant molecular clouds

Explanation:

4 0
2 years ago
Read 2 more answers
Which statement correctly describes how the endocrine system interacts with the circulatory system? A.)The endocrine system uses
blagie [28]

Answer:

C.)The endocrine system uses glands to produce hormones that travel with the blood through the blood vessels.

Explanation:

8 0
3 years ago
An air-filled capacitor consists of twoparallel plates, each with an area of 7.60 cm2,separated by a distance of 1.90 mm.A 16.0
Svetradugi [14.3K]

Answer:

(A)8,421.1 V/m

(B) 3.54 x 10^{-12} F

(C)  53.1 x 10^{-12} C

(D)  6.987 x 10^{-8} C/m^{2}

Explanation:

area (A) = 7.6 cm^{2} = 0.00076 m^{2}

distance (d) = 1.9 mm = 0.0019 m

potential difference (v) = 16 V

(A) electric field (E) = Δv / d = 16 / 0.0019 = 8,421.1 V/m

(B)  capacitance = (∈₀A)/d

     where ∈₀ =  permitivity of free space = 8.85 x 10^{-12}m^{-3}.kg^{-1} .s^{4}.A^{2}

capacitance = \frac{8.85 x 10^{-12}x0.00076}{0.0019}

capacitance (C) = 3.54 x 10^{-12} F

(C) charge (q) = C x v =  3.54 x 10^{-12} x 16  = 56.64x 10^{-12} C

(D) surface charge density = charge (q) / area =   56.64 x 10^{-12}  / 0.00076  =  7.453 x 10^{-8} C/m^{2}

3 0
2 years ago
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