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3 years ago

5

Plz di all plz i will give brainest and thanks to best answer do it right

1 answer:

Inga [223]3 years ago

7 0

Answer:

area 4

Explanation:

area 4 has low pressure

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Just as a skydiver steps out of the helicopter,someone who’s watching starts a stopwatch.so the time is zero as the skydiver ste

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Answer:

it is zero

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3 years ago

HELP MEEEEE!!!!!!!!!!A student make a drawing of an aluminum atom.Which of these should the student show in the nucleus of the a

TEA [102]

I would say B. Neutrons

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4 years ago

A hollow sphere of radius 0.200 m, with rotational inertia I = 0.0484 kg·m2 about a line through its center of mass, rolls witho

d1i1m1o1n [39]

Answer:

Part a)

$KE_r = 8 J$

Part b)

v = 3.64 m/s

Part c)

$KE_f = 12.7 J$

Part d)

$v = 2.9 m/s$

Explanation:

As we know that moment of inertia of hollow sphere is given as

$I = \frac{2}{3}mR^2$

here we know that

$I = 0.0484 kg m^2$

R = 0.200 m

now we have

$0.0484 = \frac{2}{3}m(0.200)^2$

$m = 1.815 kg$

now we know that total Kinetic energy is given as

$KE = \frac{1}{2}mv^2 + \frac{1}{2}I\omega^2$

$KE = \frac{1}{2}mv^2 + \frac{1}{2}I(\frac{v}{R})^2$

$20 = \frac{1}{2}(1.815)v^2 + \frac{1}{2}(0.0484)(\frac{v}{0.200})^2$

$20 = 1.5125 v^2$

$v = 3.64 m/s$

Part a)

Now initial rotational kinetic energy is given as

$KE_r = \frac{1}{2}I(\frac{v}{R})^2$

$KE_r = \frac{1}{2}(0.0484)(\frac{3.64}{0.200})^2$

$KE_r = 8 J$

Part b)

speed of the sphere is given as

v = 3.64 m/s

Part c)

By energy conservation of the rolling sphere we can say

$mgh = (KE_i) - KE_f$

$1.815(9.8)(0.900sin27.1) = 20- KE_f$

$7.30 = 20 - KE_f$

$KE_f = 12.7 J$

Part d)

Now we know that

$\frac{1}{2}mv^2 + \frac{1}{2}I(\frac{v}{r})^2 = 12.7$

$\frac{1}{2}(1.815) v^2 + \frac{1}{2}(0.0484)(\frac{v}{0.200})^2 = 12.7$

$1.5125 v^2 = 12.7$

$v = 2.9 m/s$

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4 years ago

What is the demand for resources, such as food, water, and shelter.

andrey2020 [161]

The demand for these things is very high. Everyone wants to have shelter, water, and food. However the demand for shelter is higher because water and food are more accessible.

3 0

3 years ago

A boat moving at 7.8 km/hr relative to the water is crossing a river 3.5 km wide in which the current is flowing at 2.8 km/hr. A

Free_Kalibri [48]

Answer: $\theta =21.03^{\circ}$

Explanation:

Given

velocity of boat with respect to river $=7.8 km/hr$

velocity of river is $2.8 km/hr$

River is 3.5 km wide

Suppose boat leaves at an angle of $\theta$ with vertical such that it reaches exactly opposite end of initial Point

Therefore

$7.8\sin \theta$ component will balance the river Flowso that sin component helps to cross the river

$7.8\sin \theta =2.8$

$\sin \theta =0.3589$

$\theta =sin^{-1}(0.3589)$

$\theta =21.03^{\circ}$

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3 years ago