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3 years ago

Susan

Physics

1 answer:

maxonik [38]3 years ago

7 0

D. Was a leader in the woman's suffrage movement

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a bullet moving with a velocity of 100m/s pierce a block of wood and moves out with a velocityof 10 m/s.if the thickness of the

erma4kov [3.2K]

The emerging velocity of the bullet is 71 m/s.

The bullet of mass m moving with a velocity u has kinetic energy. When it pierces the block of wood, the block exerts a force of friction on the bullet. As the bullet passes through the block, work is done against the resistive forces exerted on the bullet by the block. This results in the reduction of the bullet's kinetic energy. The bullet has a speed v when it emerges from the block.

If the block exerts a resistive force F on the bullet and the thickness of the block is x then, the work done by the resistive force is given by,

$W=Fx$

This is equal to the change in the bullet's kinetic energy.

$W=Fx=\frac{1}{2} m(u^2-v^2)......(1)$

If the thickness of the block is reduced by one-half, the bullet emerges out with a velocity v₁.

Assuming the same resistive forces to act on the bullet,

$F(\frac{x}{2} )=\frac{1}{2} m(u^2-v_1^2)......(2)$

Divide equation (2) by equation (1) and simplify for v₁.

$\frac{\frac{Fx}{2} }{Fx} =\frac{(u^2-v_1^2)}{(u^2-v^2)} \\\frac{100^2-v_1^2}{100^2-10^2} =\frac{1}{2} \\v_1^2=5050\\v_1=71.06 m/s$

Thus the speed of the bullet is 71 m/s

3 0

3 years ago

Plz help it’s passed due!

pickupchik [31]

It is b 9.1 :) have a nice day

5 0

4 years ago

A 2.72 A current flows through a wire for

agasfer [191]

Current=2.72A=I
Time=t=9.88s
Charge=Q

$\\ \rm\longmapsto I=\dfrac{Q}{t}$

$\\ \rm\longmapsto Q=It$

$\\ \rm\longmapsto Q=2.72\times 9.88$

$\\ \rm\longmapsto Q=26.87C$

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3 years ago

Sirens and flashing lights do NOT indicate that

sergij07 [2.7K]

Golf cart is the answer

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3 years ago

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In order to ensure a message is understood requires:

jeka94

Order to ensure a message is understood requires all four option is needed.

The option will be D.All of the above.

<h3>What is a good communication skill?</h3>

The sender is the person who is trying to communicate a message.
The challenge is that since the receiver’s education and experience may be very different from the sender's, words often have different meanings.
While we may carefully choose the words to speak, words alone represent a small percentage.
communication is only verbal the most important element of communication
When encountering a noise, take steps to reduce the distraction.

Learn more about speaking skills here:-brainly.com/question/25645043

#SPJ2

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2 years ago

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