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3 years ago

An airplane flies 12 m/s due north with a velocity of 35.11 m/s. how far east does it fly?

2 answers:

4 0

<span>The question says: The airplane flew due north for the given duration (i interpret m/s to be milliseconds) and at the given velocity.

The statement mentions no change in direction or angle, therefore the airplane does not fly east (or the airplane travels 0.0m east).</span>

goblinko [34]3 years ago

3 0

The plane's velocity of 35.11 m/s is actually due in a north-eastward direction. The 12 m/s velocity is the vertical component of the plane's velocity, hence it is pointing northwards. We will use the formula:

Vy = Vsin∅

To determine the angle ∅ at which the plane is flying. This is:

12 = 35.11 * sin∅
∅ = 20.0 degrees

The eastward velocity is:

Vx = Vcos∅
Vx = 35.11 * cos(20)
Vx = 33.0 m/s

The plane's eastward velocity is 33.0 m/s

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Answer:

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3 years ago

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A car is travelling at 20m/s, accelerates at 4m/s2 . Calculate its velocity after 5s?

IgorLugansk [536]

Answer:

Explanation:

The final velocity of an object that experiences a period of acceleration is given by:

v - vi = A*t

Initial velocity, vi, is = 20m/s

Acceleration, A, is 4m/2^2

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2 years ago

A current 1A in the human body is extremely dangerous.

zmey [24]

a) Potential difference needed: 10,000 V

b) Because the potential difference in the house is maximum 230 V

Explanation:

The relationship between current, potential difference and resistance in a conductor is given by Ohm's law:

$V=RI$

where

V is the potential difference

R is the resistance

I is the current

The resistance of the human body is estimated to be as high as $100,000 \Omega$ for a dry body and as low as $1000 \Omega$ for a wet body: in this problem, we use a value in the middle,

$R=10,000 \Omega$

Therefore, the potential difference needed to produce a current of

$I=1 A$

$V=(10,000)(1)=10,000 V$

Here we want to estimate if it is likely or not to get injured by an electric current in a house.

The amount of current that can be fatal is $I=1 A$ . From part a), we saw that in order to produce this current through the human body, a potential difference of

$V=10,000 V$