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Nimfa-mama [501]

3 years ago

5

In a weak acid solution, _____.

1 answer:

erastovalidia [21]3 years ago

8 0

Answer:

A)

Explanation:

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The power in an electrical current is given by the equation

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A single frictionless roller-coaster car of mass m = 750. kg tops the first hill with speed v = 15.0 m/s at height h = 20.0 m as

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Isabela creates a demonstration showing a sound echo. How could she demonstrate this?

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2 years ago

You have your bicycle upside down for repairs, with is 66.0 cm diameter wheel spinning freely at 230 rpm. The wheel's mass is 1.

rosijanka [135]

Answer:

$\omega_f = 17.86\ rad/s$

Explanation:

given,

dia of wheel = 66 cm

radius = 33 cm = 0.33 m

mass of wheel = 1.90 Kg

speed of wheel = 230 rpm

time to hold the tire = 3.10 s

Normal force = 2.7 N

coefficient of friction = 0.46

final angular speed = ?

we know

F = μ N

F = 0.46 x 2.7 = 1.242 N

torque

τ = F r

τ = 1.242 x 0.33 = 0.409 Nm

moment of inertia for wheel

I = MR²

I = 1.90 x 0.33²

I = 0.2069 kg m²

we now,

τ = I x α

$\alpha = \dfrac{\tau}{I}$

$\alpha = \dfrac{0.409}{0.2069}$

α = 1.981 rad/s²

we know,

$\omega_f - \omega_i = \alpha\ t$

$\omega_f - (230\dfrac{2\pi}{60}) =- 1.981 \times 3.1$

$\omega_f - 24 = - 6.14$

$\omega_f = 17.86\ rad/s$

7 0

3 years ago