2 years ago

How is radioactivity produced

1 answer:

8 0

Explanation:

It is a physical observed phenomenon, where an atom is emitting type of particles such as, alpha or beta followed by gamma radiations, which change the radioactive atom.

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A 3-kg wheel with a radius of 35 cm is spinning in the horizontal plane about a vertical axis through its center at 800 rev/s. A

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Answer:

$\omega_f = 585.37 \ rev/s$

Explanation:

given,

mass of wheel(M) = 3 Kg

radius(r) = 35 cm

revolution (ω_i)= 800 rev/s

mass (m)= 1.1 Kg

I_{wheel} = Mr²

when mass attached at the edge

I' = Mr² + mr²

using conservation of angular momentum

$I \omega_i = I' \omega_f$

$(Mr^2) \times 800 = ( M r^2 + m r^2) \omega_f$

$M\times 800 = ( M + m )\omega_f$

$3\times 800 = (3+1.1)\times \omega_f$

$2400 = (4.1)\times \omega_f$

$\omega_f = 585.37 \ rev/s$

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3 years ago

An archer puts a 0.30-kg arrow to the bowstring. An average force of 201 N is exerted to draw the string back 1.3 m. Assuming th

vovikov84 [41]

Answer:

41.74 m/s

Explanation:

The energy used to draw the bowstring = the kinetic energy of the arrow.

Fd = 1/2mv²................................ Equation 1

Where F = force, d = distance move string, m = mass of the arrow, v = speed of the arrow.

make v the subject of the equation

v = √(2Fd/m)...................... Equation 2

Given: F = 201 N, m = 0.3 kg, d = 1.3 m.

Substitute into equation 2

v = √(2×201×1.3/0.3)

v = √(1742)

v = 41.74 m/s.

Hence the arrow leave the bow with a speed of 41.74 m/s

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2 years ago

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Both physical and chemical changes are accompanied by a change in the total energy of the system, which is divided into two broa

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Answer:

I believe <u>kinetic / potential</u>

Explanation:

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1 year ago

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Hydroelectric power. That's just the term for electricity gained by using water, think of a water mill.

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2 years ago

Which of the following is a pair of vector quantities?

hammer [34]

Answer:

velocity and displacement answer

Explanation:

thanks me

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2 years ago

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