3 years ago

WILL GIVE BRAINLIEST! If a system stores kinetic energy, which choice must be true?

2 answers:

7 0

The last choice is correct, in order to have kinetic energy a object must be in motion, if not then the object has no kinetic energy

Grace [21]3 years ago

4 0

The molecules and subatomic particles must be moving.

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Consider a grill with the lid closed to be a closed system. The propane provides chemical energy. The propane is ignited to prod

katrin [286]

'A' and 'C' talk about energy being created and destroyed. That can't happen.

'D' trailed off in the middle, and we don't know WHAT it was talking about.

'B' is the only correct statement.

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3 years ago

A pendulum consists of a 2.0-kg block hanging on a 1.5-m length string. A 10-g bullet moving with a horizontal velocity of 900 m

pav-90 [236]

Answer:

The maximum height above its initial position is:

$h_{max}=1.53\: m$

Explanation:

Using momentum conservation:

$m_{b}v_{ib}=m_{B}v_{fB}+m_{b}v_{fb}$ (1)

Where:

m(b) is the mass of the bullet
m(B) is the mass of the block
v(ib) is the initial velocity of the bullet
v(fb) is the final velocity of the bullet
v(fB) is the final velocity of the block

Let's find v(fb) using equation (1)

$m_{b}(v_{ib}-v_{fb})=m_{B}v_{fB}$

$v_{fB}=\frac{m_{b}(v_{ib}-v_{fb})}{m_{B}}$

$v_{fB}=\frac{0.1(900-300)}{2}$

$v_{fB}=30\: m/s$

We need to find the maximum height, it means that all kinetic energy converts into gravitational potential energy.

$\frac{1}{2}m_{B}v_{fB}=m_{B}gh_{max}$

$h_{max}=\frac{1}{2g}v_{fB}$

$h_{max}=\frac{1}{2(9.81)}30$

$h_{max}=1.53\: m$

I hope it helps you!

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3 years ago

Mutations are avoided during replication because DNA polymerase is able to _____?

Ulleksa [173]

D. add more codes
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Answer: true

Explanation: I got the question and guessed true and it was right

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