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velikii [3]
3 years ago
13

A cannon fires a ball vertically upward from the Earth’s surface. Which one of the following statements concerning the net force

acting on the ball at the top of its trajectory is correct?a) The net force on the ball is instantaneously equal to zero newtons at the top of the flight path.b) The direction of the net force on the ball changes from upward to downward.c) The net force on the ball is less than the weight, but greater than zero newtons.d) The net force on the ball is greater than the weight of the ball.e) The net force on the ball is equal to the weight of the ball.
Engineering
1 answer:
trasher [3.6K]3 years ago
8 0

Answer:

a) The net force on the ball is instantaneously equal to zero newtons at the top of the flight path.

Explanation:

At an instantenous time at the top of the flight path, the upward force due to the Canon explosion on the ball is just equal to the weight of the ball, this will equate the net force on the ball to zero. At this point the velocity of the ball is zero before it decends down to earth under its own weight.

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Given :

Force, \vec{F}= (2\hat{i} + 5\hat{j})\ kN.

Force is acting at point A( 2 m, 3 m ) and B( 3 m, 5 m )

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Solution :

Displacement vector between point A and B is :

\vec{d} = (3-2)\hat{i} + (5-3)\hat{j}\\\\\vec{d} = \hat{i} + 2\hat{j}

Now, we know work done is given by :

W = \vec{F}.\vec{d}\\\\W= (2\hat{i} + 5\hat{j}).(\hat{i}+\hat{2j})\\\\W = (2\times 1) +( 5\times 2) \ kJ\\\\W = 12 \ kJ

W = 12000 J

Therefore, work done by force is 12000 J .

6 0
2 years ago
State the number of terms for each of the following algebraic expression 2x+1
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Answer:

Expressions are made up of terms.

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When terms have different algebraic factors, they are unlike terms.

Explanation:

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3 years ago
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Answer:

Total time taken = 0.769 hour

Explanation:

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s = slope

For Location ( 1 )

s = 0.045

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For Location ( 2 )

s = 2.5 %

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Tt2 = 0.239 hour

For Location ( 3 )

s = 1.5%

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Tt3 = 0.237  hour

For Location (4)

s = 0.5 %

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Tt4 = 0.165 hour

hence the Total time taken = Tt1 + Tt2 + Tt3 + Tt4

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5 0
3 years ago
1. What are the base pairs?
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2 years ago
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