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3 years ago

A terain tarvels 120 I in 2 hours and 30 mins .what is its average speed

Physics

2 answers:

BigorU [14]3 years ago

7 0

Answer:

the average speed is 48 km/h

Explanation:

Speed = distance / time

distance = 120 km

time = 2 hours and 30 minutes = 2.5 hours

Solution:

S = d/t

S = 120km / 2.5h

S = 48 km/h

48 km/h

hope this helps, have a good day :-)

Zarrin [17]3 years ago

6 0

Answer:

It's speed is 48 km/hr.

Explanation:

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3 years ago

A research submarine has a 20-cm-diameter window that is 9.0 cm thick. The manufacturer says the window can withstand forces up

Ratling [72]

Answer:

The maximum safe depth in salt water is 3758.2 m.

Explanation:

Given that,

Diameter = 20 cm

Radius = 10 cm

Thickness = 9.0 cm

Force $F = 1.2\times10^{6}\ N$

Inside pressure = 1.0 atm

We need to calculate the area

Using formula of area

$A=\pi\times r^2$

Put the value into the formula

$A=\pi\times(10\times10^{-2})^2$

$A=0.0314\ m^2$

We need to calculate the pressure

Using formula of pressure

$P=\dfrac{F}{A}$

Put the value into the formula

$P=\dfrac{1.2\times10^{6}}{0.0314}$

$P=38216560.50\ Pa$

$P=3.8\times10^{7}\ Pa$

We need to calculate the maximum depth

Using equation of pressure

$P=P_{atm}+\rho gh$

$h=\dfrac{P-P_{atm}}{\rho g}$

Put the value into the formula

$h=\dfrac{3.8\times10^{7}-101325}{1029\times9.8}$

$h=3758.2\ m$

Hence, The maximum safe depth in salt water is 3758.2 m.

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3 years ago