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Alex787 [66]
3 years ago
11

Tìm chỉ số của A1 và A2

Physics
1 answer:
ziro4ka [17]3 years ago
6 0

Answer:

A1

Explanation:

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3 years ago
Determine the speed of the 50-kg cylinder after it has descended a distance of 2 m, starting from rest. Gear A has a mass of 10
Naddika [18.5K]

This question is incomplete, the missing image is uploaded along this answer below.

Answer:

the speed of the 50-kg cylinder after it has descended is 3.67 m/s

Explanation:

 Given the data in the question and the image below;

relation between velocity of cylinder and velocity of the drum is;

V_D = ω_c × r_c  ----- let this be equ 1

where V_D is velocity of cylinder,  ω_c is the angular velocity of drum C and r_c is the radius of drum C

Now, Angular velocity of gear B is;

ω_B = ω_C

ω_B = V_D / r_c  -------- let this equ 2

so;

V_D / 0.1 m = 10V_D

Next, we determine the angular velocity of gear A;

from the diagram;

ω_A( 0.15 m ) = ω_B( 0.2 m )

from equation 2; ω_B = V_D / r_c

so

ω_A( 0.15 m ) = (V_D / r_c ) 0.2 m

substitutive in value of radius r_c (0.1 m)

ω_A( 0.15 m ) = (V_D / 0.1 m ) 0.2 m

ω_A( 0.15 ) = 0.2V_D / 0.1

ω_A =  2V_D  / 0.15

ω_A = 13.333V_D   ----- let this be equation 3

To get the speed of the cylinder, we use energy conversation;

assuming that the final position is;

T₁ + ∑U_{1-2 = T₂

0 + m_Dgh = \frac{1}{2}m_DV²_D + \frac{1}{2}I_Aω²_A + \frac{1}{2}I_Bω²_B

so

m_Dgh = \frac{1}{2}m_DV²_D + \frac{1}{2}(m_Ak_A²)(13.333V_D)² + \frac{1}{2}(m_Bk_B²)(10V_D)²

we given that; m_D = 50 kg, h = 2 m, m_A = 10 kg, k_A 125 mm = 0.125 m, m_B = 30 kg, k_B = 150 mm = 0.15 m.

we know that; g = 9.81 m/s²

so we substitute

50 × 9.81 × 2 = ( \frac{1}{2} × 50 × V_D²) + \frac{1}{2}( 10 × (0.125)² )(13.333V_D)² + \frac{1}{2}( 30 × (0.15)²)(10V_D)²

981 = 25V_D² + 13.888V_D² + 33.75V_D²

981 = 72.638V_D²

V_D² = 981 / 72.638

V_D² = 13.5053

V_D = √13.5053

V_D = 3.674955 ≈ 3.67 m/s

Therefore,  the speed of the 50-kg cylinder after it has descended is 3.67 m/s

7 0
3 years ago
Ek=8J <br>m=100g <br> V=?<br><br>How much is V going to be?<br>Explain step by step, please​
Darya [45]

Answer:

Explanation:

If Ek is the kinetic energy and m is the mass and v is the velocity then v can be calculated as follows

Ek= 1/2 ×( m × v² )

2Ek= mv²

2Ek/m = v²

v =√(2Ek/m)

m = 0.1 kg

v= √(2x8/0.1)= 12.65 m/s

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__________ (marketing research) information is collected from questions (measurements) that are free from systematic or statisti
tatiyna

Answer: reliable

Explanation:

Reliable (marketing research) information is collected from questions (measurements) that are free from systematic or statistical error. An absence of systematic error implies that the respondents (i.e., the sampled people) who answer questions actually understand what the questions were asking.

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Chemical equations should be balanced so that they demonstrate the law of conservation of mass. Which of the following statement
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