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3 years ago

Two cars approach a street corner at right angles to each

Physics

1 answer:

irakobra [83]3 years ago

4 0

Answer:

the angle is given by

Tan theta = 35/59 = 0.59

so theta = Tan ^-1 ( 0.59 )

theta = 30.54 deg.

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You carry a fire hose up a ladder to a height of 10 m above ground level and aim the nozzle at a burning roof that is 9 m high.

schepotkina [342]

Answer:

The value is $P_1 = 314645 \ Pa$

Explanation:

From the question we are told that

The height is $h_2 = 10 m$

The height of the burning roof is $k = 9 m$

The horizontal distance is $d = 7 \ m$

The height of the truck is $h_1 = 0.5 \ m$

Generally the time for the water to hit the roof from the hose is mathematically represented as

$t = \sqrt{\frac{2 * (h_2 - k)}{g} }$

=> $t = \sqrt{\frac{2 * (10 - 9)}{9.8} }$

=> $t = 0.4518 \ s$

Generally the velocity of the water is mathematically evaluated as

$v_2 = \frac{d}{t}$

$v_2 = \frac{ 7}{0.4518}$

$v_2 = 15.5 \ m/s$

Generally from Bernoulli's Equation we have that

$P_1 + \frac{1}{2} v_1^2 * \rho + \rho *g *h_1 = P_2 + \frac{1}{2} v_2^2 * \rho + \rho *g *h_2$

Here $P_1 [\tex] is pressure in the chamber which we are to calculate , [tex]P_2 [\tex] is the atmospheric pressure with value [tex]P_2 = 101325 \ Pa [\tex] , [tex]v_1 [\tex] is the velocity of the water before it starts flowing with value [tex]v_1 = 0 m/s [\tex] , [tex]\rho [\tex] is the density of water with value [tex]\rho = 1000 \ kg/m^3 [\tex] So [tex]P_1 + \frac{1}{2} 0^2 * 1000 + 1000 *9.81 *0.5 = 101325 + \frac{1}{2}* 15.5^2* 1000 + 1000 *9.81 *10$

$P_1 = 314645 \ Pa$

8 0

3 years ago

The Berlin marathon is one of the fastest marathons courses; many world records have been set there. In 2014 Dennis Kimetto ran

Mandarinka [93]

Answer:

about 2000 klm per min

Explanation:

7 0

3 years ago

The acceleration due to gravity on the surface of Venus is 8.83 m/s2. An object with a mass of 5.23 kg has what weight on Venus?

Marat540 [252]

Weight = m times g = 5.23 times 8.83 = 46.18 N

6 0

3 years ago

A pail in a water well is hoisted by means of a frictionless winch, which consists of a spool and a hand crank. When Jill turns

Sveta_85 [38]

Answer:

182.28 W

Explanation:

Here ,

m = 7.30 Kg

distance , d= 28.0 m

time , t = 11.0 s

average power supplied = change in potential energy/time

average power supplied = m×g×d/time

average power supplied = 7.30×9.81×28/11

average power supplied = 182.28 W

the average power supplied is 182.28 W

6 0

3 years ago

What’s the difference between atoms and molecules in a substance?

Goryan [66]

Answer:

Atoms are single neutral particles.

example: Ne, O

Molecules are neutral particles made of two or more atoms bonded together.

example:O2,HCl

5 0

3 years ago

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