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3 years ago

100 POINTS. PLEASE EXPLAIN

Physics

2 answers:

Valentin [98]3 years ago

6 0

Answer:

Explanation:

(b) cuz the 1st n 3nd row cancel out, net electric field will go from +3Q to -3Q. the direction is right.

Assoli18 [71]3 years ago

3 0

Answer:

Explanation:

Note the charge balls on the top and bottom row are identical. So those charges cancel each other out. The only charges in the net electric field are the two in the middle row.

Electric field strength = k*Q/r^2

= (8.99 *10^9) * (3-(-3)) * 5*10^(-6) / (2*0.5)^2

= 269700 N/C

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A banana is fired from a cannon on the ground just as a monkey starts to fall from a tree. The monkey catches the banana in mida

Lady bird [3.3K]

Here banana is fired from the canon towards the monkey with certain velocity

while at the same instant when banana is fired money starts to fall from the tree

So here when monkey is in the mid air he catches the banana

It is possible because in the same interval of time when the monkey cover some distance from the tree towards ground then in the same time banana cover the distance from ground towards monkey

So they meet at some point in the mid air

So here since both are moving free in air so they both must have same vertical acceleration

this is acceleration due to gravity

so here correct answer will be

C. The banana and monkey had the same acceleration.

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3 years ago

Which of these can a star become at the end of its evolution? Choose the three correct answers.

Helga [31]

White dwarf star is change into black dwarf when it cools down and dims.

<h3>What can a star become at the end of its evolution?</h3>

The White Dwarf is a star that eventually cools and dims. When it stops shining, this star is now a dead star which is also called a Black Dwarf. Massive stars transform into different stars such as supernovae, neutron stars and black holes while on the other hand, the average stars like the sun, change into a white dwarf that is surrounded by a disappearing planetary nebula.

So we can conclude that white dwarf star is change into black dwarf when it cools down and dims.

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2 years ago

Read 2 more answers

A 50.1 kg diver steps off a diving board and drops straight down into the water. The water provides an average net force of resi

Varvara68 [4.7K]

Answer:

The total distance is 16.9 m

Explanation:

We understand work in physics as certain force exerted through certain distance. To reach that point below the water, the work done by the diver must be equal to the work done by the water's force of resistance. Therefore, we determine both work expressions and we solve the equation for the diver distance, which is the total distance between the diving board and the stopping point underwater.

$W_{d}: work done by diver\\W_{R}: work due the force of resistance\\W_{d} = W_{R}\\F_{d}\times d_{d}=F_R \times d_{R}\\d_{d}= \frac{F_R \times d_R}{F_d}= \frac{F_R \times d_R}{m_d \times g}= \frac {1598 N \times 5.2 m}{50.1 kg \times 9.81 m/s^2}\\d_{d}= 16. 91 m$

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3 years ago

A man walks south at a speed of 2.00 m/s for 60.0 minutes. He then turns around and walks north a distance 3000 m in 25.0 minute

PSYCHO15rus [73]

Answer:

v = 0.823 m/s

Explanation:

A man walks south at a speed of 2.00 m/s for 60.0 minutes.

The distance covered in South = 60 × 60 × 2 = 7200 m

He then turns around and walks north a distance 3000 m in 25.0 minutes.

As they moved in opposite direction, net displacement will be : 7200 - 3000 = 4200 m

Average velocity of the man = net displacement/time

$v=\dfrac{4200\ m}{(60+25)\times 60}\\\\=0.823\ m/s$

So, the average velocity of the man is 0.823 m/s.

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3 years ago

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Tatiana [17]

Answer:

In any collision (crash) the momentum

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3 years ago