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nekit [7.7K]
3 years ago
10

A 0.15 kg arrow moving with an initial velocity of 30 m/s passes through a 3.0 kg block initially at rest on a frictionless surf

ace. If the final speed of the arrow is 25 m/s, what is the speed of the block?
Physics
1 answer:
Marysya12 [62]3 years ago
7 0

Answer:

.25 m/s

Explanation:

We shall use the law of conservation of momentum . We do not use law of conservation of mechanical energy because in such cases there is loss of energy.

Momentum = mass x velocity

Initial momentum of arrow and block

= .15 x 30 +0 = 4.5 J

If final velocity of block be V

Total final momentum of both arrow and block

= .15 x 25 + 3 V

= 3.75 +3V

So

3.75 + 3 V = 4.5

V = .25 m/s

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This pod moved differently because it was more massive.

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2 years ago
Group 7A of the periodic table contains the?
olga2289 [7]

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4 0
3 years ago
Read 2 more answers
What nuclear weapon is the biggest and who currently owns this bomb
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3 years ago
Two cylindrical resistors are made from the same material. The shorter one has length L, diameter D, and resistance R1. The long
nordsb [41]

Answer:

the resistance of the longer one is twice as big as the resistance of the shorter one.

Explanation:

Given that :

For the shorter cylindrical resistor

Length = L

Diameter = D

Resistance = R1

For the longer cylindrical resistor

Length = 8L

Diameter = 4D

Resistance = R2

So;

We all know that the resistance of a given material can be determined by using the formula :

R = \dfrac{\rho L }{A}

where;

A = πr²

R = \dfrac{\rho L }{\pi r ^2}

For the shorter cylindrical resistor ; we have:

R = \dfrac{\rho L }{\pi r ^2}

since 2 r = D

R = \dfrac{\rho L }{\pi (\frac{2}{2 \ r}) ^2}

R = \dfrac{ 4 \rho L }{\pi \ D   ^2}

For the longer cylindrical resistor ; we have:

R = \dfrac{\rho L }{\pi r ^2}

since 2 r = D

R = \dfrac{ \rho (8 ) L }{\pi (\frac{2}{2 \ r}) ^2}

R = \dfrac{32\rho L }{\pi \ (4 D)   ^2}

R = \dfrac{2\rho L }{\pi \ (D)   ^2}

Sp;we can equate the shorter cylindrical resistor to the longer cylindrical resistor as shown below :

\dfrac{R_s}{R_L} = \dfrac{ \dfrac{ 4 \rho L }{\pi \ D   ^2}}{ \dfrac{2\rho L }{\pi \ (D)   ^2}}

\dfrac{R_s}{R_L} ={ \dfrac{ 4 \rho L }{\pi \ D   ^2}}* { \dfrac  {\pi \ (D)   ^2} {2\rho L}}

\dfrac{R_s}{R_L} =2

{R_s}=2{R_L}

Thus; the resistance of the longer one is twice as big as the resistance of the shorter one.

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tino4ka555 [31]
A hypothesis is often written as an if/then statement or prediction law theory guess. A hypothesis is also known as an educated guess.

Your answer is: Hypothesis 

Have an amazing day!
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4 years ago
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