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3 years ago

What is the numbeA driver started from origin and drove 5 km towards east, he then drove 3 km due west. His displacement is:

Physics

1 answer:

myrzilka [38]3 years ago

5 0

Answer:

4135.12

Explanation:

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3 years ago

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The radius of the earth very nearly circular orbit around the sun is

Katen [24]

Answer

given,

radius of earth,r = 1.5 x 10¹¹ m

Time,T = 365 days

= 365 x 24 x 3600 s

earth velocity,

$v=\dfrac{2\pi r}{T}$

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v = 3 x 10⁴ m/s

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$a = \dfrac{v^2}{r}$

$a = \dfrac{(3\times 10^4)^2}{1.5\times 10^{11}}$

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3 years ago

A student does 25 J of work on the handle of a pencil sharpener. If the pencil sharpener does 20 J of work on the pencil, what i

allsm [11]

Answer:

80%

Explanation:

Efficiency of machine = work output/work input ×100 %

From question, work output = 20J

Work input = 25J.

Therefore efficiency = 20/25 × 100 %

Efficiency = 20×4 %

Efficiency = 80%

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3 years ago

A manometer using oil (density 0.900 g/cm3) as a fluid is connected to an air tank. Suddenly the pressure in the tank increases

Mila [183]

Answer:

Rise in level of fluid is 0.11 m

Rise in level of fluid in case of mercury is 0.728 cm or 7.28 mm

Solution:

As per the question:

Density of oil, $\rho_{o} = 0.900\ g/cm^{3} = 900\ kg/m^{3}$

Change in Pressure in the tank, $\Delta P = 7.28\ mmHg$

Density of the mercury, $\rho_{m} = 13.6\ g/cm^{3} = 13600\ kg/m^{3}$

Now,

To calculate the rise in the level of fluid inside the manometer:

We know that:

1 mmHg = 133.332 Pa

Thus

$\Delta P = 7.28\ times 133.332 = 970.656\ Pa$

Also,

$\Delta P = \rho_{o} gh$

where

g = acceleration due to gravity

h = height of the fluid level

$970.656 = 900\times 9.8\times h$

h = 0.11 m

Now, if mercury is used:

$\Delta P = \rho_{m} gh$

$970.656 = 13600\times 9.8\times h$

h = 0.00728 m = 7.28 mm

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4 years ago

A bird flying 5.0 m overhead sees me drop it, and starts to dive straight down towards the bread the instant I release it. She c

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3 years ago