2 years ago

An object traveling at a constant

Physics

1 answer:

mel-nik [20]2 years ago

4 0

Answer:

pi / 2 radians / s

Explanation:

One revolution = 2 pi Radians in 4 seconds

2 pi / 4 = pi/2 radians / s

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3 years ago

A straight fin is made from copper (k = 388 W/m-K) and is 0.5 cm in diameter and 30 cm long. The temperature at the base of the

erastovalidia [21]

Answer:

The rate of transfer of heat is 0.119 W

Solution:

As per the question:

Diameter of the fin, D = 0.5 cm = 0.005 m

Length of the fin, l =30 cm = 0.3 m

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Air temperature, $T_{infty} = 20^{\circ}$

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Now,

Perimeter of the fin, p = $\pi D = 0.005\pi \ m$

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A = $\frac{\pi}{4}(0.5\times 10^{-2})^{2} = 6.25\times 10^{- 6}\pi \ m^{2}$

To calculate the heat transfer rate:

$Q_{f} = \sqrt{hkpA}tanh(ml)(T_{b} - T_{infty})$

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A 2.2kg block of ice slides across a rough floor. Its initial velocity is 2.5m/s and its final velocity is 0.50m/s. How much of

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