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Hunter-Best [27]
3 years ago
15

A volcano launches a lava bomb straight upward with an initial speed of 28m/s. Taking upward to be the positive direction,find s

peed and direction of motion of the lava bomb . a) 2.0seconds and b)3.0seconds after it is launched
Physics
1 answer:
lara31 [8.8K]3 years ago
5 0
<span>The equation to be used here would be:

v = u - gt
 where u is the initial speed, g is the acceleration due to gravity and t is the time it takes

a) u = 28 m/s, g = 9.8 m/s^2, t = 2s
 
v = 28 m/s - 9.8 m/s^2 * 2s = 8.4 m/s after 2 s the lava bomb is still travelling upwards
 
b) u = 28 m/s g = 9.8 m/s^2 t = 3s
 
v = 28 m/s - 9.8 m/s^2 * 3s = -1.4 m/s after 3s the lave bomb is travelling downwards</span>
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Answer:

  • <u><em>1,230N</em></u>

Explanation:

<u>1. Name of the variables:</u>

   f:frequency\\\\ \omega:angular\text{ }speed\\\\ a_c:centripetal\text{ }acceleration\\\\ F_c:centripetal\text{ }force\\ \\ m:mass\\ \\ d:diameter\\ \\ r:radius\\ \\ g:gravitational\text{ }acceleration

<u>2. Formulae:</u>

         f=\dfrac{number\text{ }of\text{ }revolutions}{time}

          \omega=2\pi f

          a_c=\omega^2 r

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<u>3. Solution (calculations)</u>

       f=\dfrac{1}{1.65s}=0.\overline{60}s^{-1}

       \omega=2\pi\times0.\overline{60}\approx 3.808rad/s

      a_c=(3.808rad/s)^2\times (3.74/2m)=27.12m/s^2

      F_c=45.2kg\times27.12m/s^2=1,225.67N\approx 1,230N

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3 years ago
2. What is the water pressure at a depth of 24 m in a lake? [Density of water, p = 1 000 kg m- and gravitational acceleration, g
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Answer:

Pressure = ρgh

pressure (p) is measured in pascals (Pa)

density (ρ) is measured in kilograms per metre cubed (kg/m3)

The fore of gravitational field strength (g) is measured in N/kg or m/s 2

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Answer = 235,200 Pa

Explanation:

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Pressure = 1,000 x 9.8 x 24

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