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rosijanka [135]
3 years ago
15

Pentru a scoate apă dintr‑o fântână, Ionel folosește dispozitivul reprezentat în figura 3, în care d = 20 cm și ℓ = 40 cm. Gălea

ta plină cu apă are masa m = 14 kg. Calculează forța pe care trebuie să o exercite Ionel pentru a scoate găleata, acționând perpendicular pe manivelă, într‑o mișcare uniformă.VA ROG DAU COROANA

Physics
1 answer:
icang [17]3 years ago
6 0

Answer:

no comprendo

Explanation:

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A centrifuge is a device used to separate materials by their masses. A sample in a centrifuge is rotated at high speeds along a
german

Answer:

 F = 1.047 10⁻² N

Explanation:

Let's use kinematics to find the angular acceleration

             w = w₀ + α t

as for rest w₀ = 0

             w = α t

             α = w / t

let's reduce the magnitudes to the SI system

              w = 1000 rev / min (2π rad/ 1 rev) (1 min/ 60s) = 104.72 rad / s

              m = 1.00 g (1 kg / 1000 g) = 1,000 10⁻³ kg

              r = 10.0 cm (1 m / 100 cm) = 0.100 m

let's calculate

              α = 104.72 / 1

              α = 104.72 rad / s²

angular and linear variables are related

               a = α  r

               a = 104.72 0.100

               a = 10.47 m / s²

finally we substitute in Newton's second law

               F = 1 10⁻³ 10.47

               F = 1.047 10⁻² N

8 0
3 years ago
URGENT: Two horizontal forces act on an object on a surface. There is a 20 Newton applied force to the left and a sliding fricti
anygoal [31]

Answer:

xbzcfhkuvy

Explanation:

dvdvxvdzdx

7 0
3 years ago
2. A proton and an electron are sitting 0.5m away from each other. What is the
Brrunno [24]

Answer:we can calculate the answer by the following formula;

Explanation:

3 0
3 years ago
A wire of length L is made up of two sections of two different materials connected in series. The first section of length L1 = 1
ololo11 [35]

Answer:

Explanation:

velocity of wave in a tense wire is given by the expression

v= \sqrt{\frac{T}{m} }

v is velocity . T is tension and m is mass per unit length .

for steel wire

m = π r² ρ where r is radius and ρ is density

= 3.14 x (5.3 x 10⁻⁴)²x7.75 x 10³

= 683.57 x 10⁻⁵ kg/m

v =  \sqrt{\frac{148}{683.57\times 10^{-5}} }

= 1.47 x 10² m /s

= 147 m /s

for iron  wire

m = π r² ρ where r is radius and ρ is density

= 3.14 x (5.3 x 10⁻⁴)²x7.86 x 10³

= 693.27 x 10⁻⁵ kg/m

v = \sqrt{\frac{148}{693.27\times 10^{-5}} }

= 146 m /s

Time taken to move from one end to another

= 17.7 / 147 + 28.5 / 146

= .12 + .195

= .315 s .

4 0
3 years ago
A wheelhas a radius of 4.8 m. Howfar (path length) does a point on the circumference travel if thewheel is rotated through angle
valentina_108 [34]

Answer:

(a) 2.512 m

(b) 144 m

(c) 904.32 m

Explanation:

radius, r = 4.8 m

(a) for 30 degree

As we know that in 360 degree it rotates a complete round that means circumference.

In 360 degree, it rotates = 2 x π x r

in 30 degree, it rotates = 2 x π x r x 30 / 360

                                      = 2 x 3.14 x 4.8 x 30 / 360

                                      = 2.512 m

(b) for 30 rad

As we know that in one complete rotation, it rotates by 2π radian.

so,

for 2π radian it rotates = 2 x π x r

for 30 radian, it rotates = 2 x π x r x 30 / 2 π = 144 m

(c) For 30 rev

In one complete revolution, it travels = 2 x π x r

in 30 rev, it travels = 2 x π x r x 30 = 2 x 3.14 x 4.8 x 30 = 904.32 m

8 0
3 years ago
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