Help! (Look in the pic)

The foot pedal on hydraulic brake system exerts a force of 45 lb on a piston with a diameter of 1.00 cm. The brake fluid in the

ElenaW [278]

Answer:

the correct answer is C, 281 lb

Explanation:

This is an exercise in fluid mechanics specifically on Pascal's principle, which states that the pressure in a fluid is equal to all points that are at the same depth

P = $\frac{F_{1} }{A_{1} }$ = $\frac{F_{2} }{A_{2} }$

If we use the subscript 1 for the piston diameter mentor (d = 1.00vm) which is r = 0.05 cm, the force is F1 = 45 lb

F₂ = \frac{F_{1} }{A_{1} } F₁

in area of a circules

A = π r²

we substitute

F₂ = $\frac{r_{2}^2 }{r_{1}^2} F_{1}$

let's calculate

F2 = 2.50² / 1.00² 45

F2 =281 lb

therefore the correct answer is C

3 0

3 years ago

Find the minimum value of n in the Balmer series for which the predicted wavelength is in the ultraviolet region of the spectrum

d1i1m1o1n [39]

Answer:

λ =365.4 nm

Explanation:

Boh's atomic model of the Hydrogen atom the energy of each level is

Eₙ = - 13.606 / n²

where the synergy is in electonvotes and the value of E₀ = 13.606 eV is the energy of the base state of hydrogen.

An atomic transition occurs when an electron goes from an excited state and joins everything of lower energy.

ED = 13.606 (1 / n₀² - 1 / $n_{f}^{2}$ )

we are going to apply this relationship to answer slash.

At the beginning of the studies of atomic transitions, each group did not consider having a different name

name Initial state

Lymman 1

Balmer 2

the final state is any other state sta the continuum that corresponds to n = inf

Let's look for the highest energy of the Balmer series

ΔE = 13.606 (1/2² - 1 /∞)

ΔE = 3.4015 eV

Let's use the Planck relation for the energy

E = h f = h c /λ

λ = h c / E

Let's reduce the energy to J

E = 3.4015 eV (1.6 10⁻¹⁹ J / 1 eV) = 5.4424 10⁻¹⁹

λ = 6.63 10⁻³⁴ 3 10⁸ / 5.4424 10⁻¹⁹

λ = 3.654 10⁻⁷ m

λ = 3,654 10⁻⁷ m (10⁹ nm / 1m)

λ =365.4 nm

this eta radiation in the ultraviolet range

5 0

3 years ago

Why is that the hunter can not aim at the fish he can see

poizon [28]

Answer: Because the hunter will try to aim at the fish, but the image of fish he sees is actually the apparent image of the fish at a location.

Heres an image to help

Hope this helps!

6 0

3 years ago

An alpha particle consists of two protons and two neutrons with a mass of 6.64 x 1027 kg and charge 3.2 x 10-19 C. If two of the

Dafna11 [192]

Answer: ratio = 3.14 × 10³⁵

Explanation:

From Newtons law of Universal Gravitation;

Every object in the universe is attracted to every other object

F = (Gm₁m₂)/r²

G = 6.67 X 10⁻¹¹ N-m²/kg²

M₁= mass of one object

M₂= mass of second object

r = distance from center of objects

q = charge = 3.2 x 10⁻¹⁹C.

Calculating the gravitational force;

Fg = (Gm₁m₂)/r² = (Gm²)/r²

which is = (6.67×10⁻¹¹ × (6.64×10⁻²⁷)²) / r²

= (2.94 × 10⁻⁶³) / r²

Calculating the electric force;

Fe = (Kq₁q₂) / r² = K q² / r² = (9×10⁹ × (3.2 × 10⁻¹⁹)² / r²

Fe = 9.22 × 10⁻²⁸ / r²

comparing the ratio of both forces we have;

Fe/Fg = (9.22×10⁻²⁸/r²) ÷ (2.94×10⁻⁶³/r²)

r² cancels from the above expression, which gives;

ratio as 3.14 × 10³⁵

8 0

3 years ago

Determine the weight of a 1350 kg rock as it falls off a cliff.

mr Goodwill [35]

Answer:

13,230 N

Explanation:

F = mg

F = (1350 kg)(9.8 m/s²)

F = 13,230 N

5 0

3 years ago