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UNO [17]
3 years ago
15

+

Physics
1 answer:
umka21 [38]3 years ago
6 0
Answer: figure A

Explanation:
Electric field lines point away from positive charges (like charges repel) and towards negative charges (unlike charges attract). ... Field lines do not touch or cross each other. Field lines are drawn perpendicular to a charge or charged surface. The greater the magnitude of the charge, the stronger its electric field.

Figure B shows a positive charge but has a negative field line so that’s wrong.

Figure C shows a negative charge but has a positive field line so that’s wrong.

Figure D shows a negative charge but has no perpendicular field lines so that’s wrong.
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A ball with mass 0.11 kg is thrown upward with initial velocity 10 m/s from the roof of a building 20 m high. Neglect air resist
inessss [21]

Answer:

a) H=25.1020\ m

b)  t=3.2838\ s

Explanation:

Given:

  • mass of the ball thrown up, m=0.11\ kg
  • initial velocity of the ball thrown up, u=10\ m.s^{-1}
  • height above the ground from where the ball is thrown up, h=20\ m

a)

Maximum height attained by the ball above the roof level can be given by the equation of motion.

As,

v^2=u^2-2g.h'

where:

v= final velocity at the top height of the upward motion =0\ m.s^{-1}

g= acceleration due to gravity

h'= height of the ball above the roof

Now,

0^2=10^2-2\times 9.8\times h'

h'=5.10\ m

Therefore total height above the ground:

H=h+h'

H=20+5.1020

H=25.1020\ m

b)

Now we find the time taken in raching the height h':

v=u-gt'

v= final velocity at the top of the motion =0\ m.s^{-1}

So,

0=10-9.8\times t'

t'=1.0204\ s

Now the time taken in coming down to the ground from the top height:

H=u'.t_d+\frac{1}{2} g.t_d^2

where:

u'= is the initial velocity of the ball in course of coming down to ground from the top =0\ m.s^{-1}

Here the direction acceleration due to gravity is same as that of motion so we are taking them positively.

25.1020=0+0.5\times 9.8\times t_d^2

t_d=2.2634\ s

Therefore the total time taken in by the ball to hit the ground after it begins its motion:

t=t'+t_d

t=1.0204+2.2634

t=3.2838\ s

4 0
3 years ago
Which of the following organs are found in the
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Answer:

small intestine, tongue and large intestine

Explanation:

The GI tract is a series of hollow organs joined in a long, twisting tube from the mouth to the anus. The hollow organs that make up the GI tract are the mouth, esophagus, stomach, small intestine, large intestine, and anus. The liver, pancreas, and gallbladder are the solid organs of the digestive system.

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Question 14 of 30
polet [3.4K]

Answer:

kinetic and potential

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Volcanoes are usually formed as a result of
Igoryamba
It is the first choice
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4 years ago
Carole is very tired and makes coffee. why would newton say that she must use her hand to put up the cup
Marat540 [252]
<span>newton say that she must use her hand to put up the cup because the work is equal to force times it distance, that is in the same direction of the force applied. if carole used her hand to put up the cup, then he is not applying any work because the displacement is not in the same direction of the force</span>
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3 years ago
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