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3 years ago

7

What is the formula to find initial velocity?

1 answer:

Inga [223]3 years ago

7 0

Answer:

s = ut + 1/2at^2

Explanation:

s= distance

u= initial velocity

a= acceleration

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A 2.0-kg block is on a perfectly smooth ramp that makes an angle of 30° with the horizontal. (a) What is the block’s acceleratio

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Answer:

The forces that do non-zero work on the block are gravity and normal reaction force

Explanation:

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3 years ago

Speed is the rate of change in

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Speed is the rate of change <span>of distance.</span>

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An Atwood machine consists of two masses, mA = 6.8 kg and mB = 8.0 kg , connected by a cord that passes over a pulley free to ro

Lisa [10]

To solve this problem it is necessary to apply the concewptos related to Torque, kinetic movement and Newton's second Law.

By definition Newton's second law is described as

F= ma

Where,

m= mass

a = Acceleration

Part A) According to the information (and as can be seen in the attached graph) a sum of forces is carried out in mass B, it is obtained that,

$\sum F = m_b a$

$m_Bg-T_B = m_Ba$

$T_B = m_Bg-m_Ba$

In the case of mass A,

$\sum F = m_A a$

$T_A = m_Ag-m_Aa$

Making summation of Torques in the Pulley we have to

$\sum\tau = I\alpha$

$T_BR_0-T_AR_0=I\alpha$

$T_B-T_A=I\frac{a}{R^2_0}$

Replacing the values previously found,

$(m_Bg-m_Ba )-(m_Ag-m_Aa )=I\frac{a}{R^2_0}$

$(m_B-m_A)g-(m_B+m_A)a=I\frac{a}{R^2_0}$

$a = \frac{(m_B-m_A)g}{\frac{I}{R_0^2}+(m_B+m_A)}$

$a = \frac{(m_B-m_A)g}{\frac{MR^2_0^2/2}{R_0^2}+(m_B+m_A)}$

$a =\frac{(m_B-m_A)g}{\frac{M}{2}+(m_B+m_A)}$

Replacing with our values

$a =\frac{(8-6.8)(9.8)}{\frac{0.8}{2}+(8+6.8)}$

$a=0.7736m/s^2$

PART B) Ignoring the moment of inertia the acceleration would be given by

$a' =\frac{(m_B-m_A)g}{(m_B+m_A)}$

$a' =\frac{(8-6.8)(9.8)}{(8+6.8)}$

$a' = 0.7945$

Therefore the error would be,

$\%error = \frac{a'-a}{a}*100$

$\%error = \frac{0.7945-0.7736}{0.7736}*100$

$\%error = 2.7%$

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3 years ago

Iron is a <br> 1. Compound<br> 2.an element <br> 3.a mixture

Tcecarenko [31]

Answer:

Iron is a element

Explanation:

a substance that cannot be broken down into simpler substances by chemical means, and is characterized by its atomic number, , which represents the number of positively charged particles within that element's nucleus

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How long will it take a car to go from 0 to 45 km/hr if they are accelerating at 5 km/hr/s?

Mandarinka [93]

Answer:

9 seconds

Explanation:

$acceleration = \frac{final \: speed - initial \: speed}{time \: taken}$

$5km/ hr/ s = \frac{45 - 0 (km/ h)}{t}$

cross multiplying

$5t = 45 secs \\ t = 9 \: secs$

it will take 9secs for the car to go from 0 to 45 km/ h

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3 years ago