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4 years ago

Two blocks with the same weight but different dimensions are floating in water at different levels.

Physics

1 answer:

fredd [130]4 years ago

6 0

Answer:

(ii) less than

Explanation:

The blocks has the same mass. So, the buoyant force depends only on the volume of the displaced fluid. Since block A has a smaller volume than block B, it displaces a smaller amount of fluid. Therefore the bouyant force exerted by water is less in block A than in block B.

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A banked circular highway curve is designed for traffic moving at 58 km/h. The radius of the curve is 201 m. Traffic is moving a

skelet666 [1.2K]

Answer:0.077

Explanation:

Given

banked designed for traffic moving at $58 km/h\approx 16.11 m/s$

Radius of the curve 201 m

Actual traffic velocity = $37 km/h approx 10.27 m/s$

For banking of road

$tan\theta =\frac{v^2}{rg}$

$tan\theta =\frac{16.11^2}{201\times 9.81}$

$\theta =7.49^{\circ}$

Centripetal acceleration is given by

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

Taking component of centripetal acceleration

along and perpendicular to surface

$a_{parallel}=\frac{v^2cos\theta }{r}$

$a_{perpendicular}=\frac{v^2sin\theta }{r}$

From FBD

$mgsin\theta -f_s=ma_{parallel}$

$f_s=mgsin\theta -ma_{parallel}$ ----1

where $f_s$ is frictional force

$N-mgcos\theta =ma_{perpedicular}$

$N=mgcos\theta +ma_{perpedicular}$ ----2

and we know coefficient of friction is given by

$\mu =\frac{f_s}{N}$

$\mu =\frac{mgsin\theta -ma_{parallel}}{mgcos\theta +ma_{perpedicular}}$

$\mu =\frac{gsin\theta -\frac{v^2cos\theta }{r}}{gcos\theta +\frac{v^2sin\theta }{r}}$

$\mu =\frac{1.2804-0.5202}{9.726+0.068}$

$\mu =0.077$

7 0

3 years ago

Which statement most accurately compares Earth’s crust and Earth’s mantle?

notsponge [240]

The earths crust starts the beginging of growth of land and plants while the earths mantle is deeper and has no life living on top of it

6 0

3 years ago

Who theorized that electromagnetic radiation is emitted from a black hole due to quantum effects near the event horizon. Hint: A

wolverine [178]

Answer:

Stephen William Hawking

Explanation:

Stephen William Hawking was a popular theoretical physicist born on 8th January 1942.

He served as the professor of mathematics at the Cambridge university

He was director at the center for theoretical cosmology.

He has theorized that the black holes will emit radiations and the radiations is known by his name Hawking's radiation.

His book 'The Brief History of Time' appeared as one of the best seller according to the Sunday Times.

Hawking's was diagnosed for a rare disease named as motor neuron disease.

He received numerous awards and elected as the fellow of royal society.

He passed away on 14th March 2018.

6 0

3 years ago

If a speed sound in air at o°c is 331m/s. what will be its value at 35 °c

Lady_Fox [76]

Answer:

352 m/s

Explanation:

The velocity of sound in air is approximated as:

v ≈ 331 + 0.6 T

where v is the velocity in m/s and T is the temperature in Celsius.

At T = 35:

v = 331 + 0.6 (35)

v = 352 m/s

5 0

3 years ago

If a loaded truck that accelerates at 1 meter per second squared loses its load and has three-fourths of the origional mass, wha

Nina [5.8K]

I believe it'd accelerate at 1.25 m/s^2 instead of 1, as it lost 1/4 of its mass (.25), so now it is .25 of 1 faster.

8 0

3 years ago