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QveST [7]
3 years ago
6

NEED AN ANSWER FAST PLEASE 70 PTS

Physics
1 answer:
lara [203]3 years ago
4 0

Answer:

0.062

m/s

Explanation:

Quantities:

m

a

=

70

kg

m

o

=

26

kg

v

o

f

=

1

6

m/s

v

a

f

=

?

m/s

v

a

i

=

v

o

i

≡

v

i

m/s

p

a

i

+

p

o

i

=

p

a

f

+

p

o

f

m

a

v

a

i

+

m

o

v

o

i

=

m

a

v

a

f

+

m

o

v

o

f

(

m

a

+

m

o

)

v

i

=

m

a

v

a

f

+

m

o

v

o

f

(

70

+

26

)

v

i

=

(

70

)

v

a

f

+

(

26

)

(

1

6

)

96

v

i

=

70

v

a

f

+

13

3

We can assume that the initial speed of the astronaut is zero for the sake of argument. It says "floating in space", so maybe that actually means 0. The actual initial and final speeds are unimportant, because we are just looking for the change (or difference) in the two speeds.

−

13

3

=

70

v

a

f

v

a

f

=

−

0.062

m/s

This means that the astronauts speed will change by  

0.062

m/s and the astronaut will move in the opposite direction of the object (hence the minus sign).

Explanation:

braineist pls

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So the amount of heat required here will be 35× 80cal

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Three charges, Q1, Q2, and Q3 are located in a straight line. The position of Q2 is 0.301 m to the right of Q1. Q3 is located 0.
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Answer and Explanation: A charge exerts a force over another charge even if they are very far apart. This force is called <u>Electrostatic</u> <u>Force</u>.

If the two charges have the same sign, e.g. both aare positive, the force between them is opposite. If they have opposite sign, the force is towards each other. In other words, for electrostatic force, equal charges repel and different charges attract.

So,

1. If Q2 and Q3 have opposite signs, it is TRUE force in Q2 will go the left;

2. If the 2 are negative, they have the same sign, so it's FALSE force is to the right;

Sentences 3 and 4 are also TRUE due to the reasons described above;

5. If the charges have opposite signs, it means force is towards each other, or, to the right, so the sentence is TRUE;

1. Force is directly proportional to charges in Coulomb [C] and inversely proportional to distance squared in [m]:

F=\frac{k.q.Q}{r^{2}}

where k is a constant that equals 9 x 10⁹ N.m²/C²

Calculating force between 1 and 2:

F_{12}=\frac{9.10^{9}(1.9.10^{-6})(2.84.10^{-6})}{(0.301)^{2}}

F_{12}=536.02.10^{-3} N

Force between 2 and 3:

F_{23}=\frac{9.10^{9}(2.84.10^{-6})(3.03.10^{-6})}{(0.169)^{2}}

F_{23}=2711.63.10^{-3} N

Total force is the net force. Since Q2 is negative and the others are positive, force of 2 related to 1 is to left and related to 3 is to the right. Therefore, total force is the difference between those two forces:

F_{T}=2711.63.10^{-3}-536.02.10^{-3}

F_{T}=2175.61.10^{-3} N

The total force on Q2 is 2175.61 x 10⁻³ N

2. For net force to be 0, F_{13}=F_{23}. Suppose distance from 1 to 3 is x, then from 2 to 3 is x-0.301

Calculating:

\frac{k(1.90.10^{-6})(3.03.10^{-6})}{x^{2}}=\frac{k(2.84.10^{-6})(3.03.10^{-6})}{(x-0.301)^{2}}

\frac{5.757.10^{-12}}{x^{2}} =\frac{8.6052.10^{-12}}{x^{2}-0.602x+0.090601}

\frac{5.757.10^{-12}}{8.6052.10^{-12}}=\frac{x^{2}}{x^{2}-0.602x+0.090601}

x^{2}=0.67x^{2}-0.40x+0.061

0.33x^{2}+0.40x-0.061=0

roots = 0.14 or -1.35

Solving quadratic equation gives 2 roots, but one of the roots is negative. As distance is a measure that cannot be negative, the solution is x = 0.14.

The distance of Q3 relative to Q1 is 0.14 m

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SpyIntel [72]
This is a problem of conservation of momentum

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A) man throws the rock forward

=>

rock:
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sled and man:
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v2 = ?

Conservation of momentum:
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46.08N*s = 0.310kg*14.5m/s + 95.69kg*v2

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B) man throws the rock backward

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Explanation:

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