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Art [367]
3 years ago
9

HELP MEEEEE (science)

Physics
1 answer:
leva [86]3 years ago
6 0

Answer:

Decreases the friction between the mallet and the pick.

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The flowers of the bunchberry plant open with astonishing force and speed, with pollen grains accelerating from rest to 7.5 m/s.
zimovet [89]

Answer:

a) J=7.5*10^{-10}

b) F = 2.5*10^{-6}N

c) The force is 2551.02 times bigger than the weight of the pollen grain.

Explanation:

a) we know that the impulse J is equal to:

J =MV_f-MV_i

where M is the mass, V_f is the final velocity and V_i the initial velocity. So, replacing values, we get:

J =(10^{-10})(7.5m/s)-(10^{-10}(0)

J =(10^{-10})(7.5m/s)

J=7.5*10^{-10}

b) We know that the force is equal to:

F = J/t

where J is the impulse and t the time. So, replacing values, we get:

F = \frac{7.5*10^{-10}}{0.0003}

F = 2.5*10^{-6}N

c) The weight W of the pollen grain is calculated as:

W = 10^{-10}*9.8

W = 9.8*10^{-10}N

So, if we compare the force and the weight of the pollen grain, we get:

\frac{2.5*10^{-6} }{9.8*10^{-10} } =2551.02

it means that the force is 2551.02 times bigger than the weight of the pollen grain.

3 0
3 years ago
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What is the smallest particle of an element that still retains of that element
Thepotemich [5.8K]

Answer:

atom

Explanation:

the first guy who gave link this is for you:

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Which statement about the speed of light is true?
kolezko [41]
' B ' is the only true one.
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