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san4es73 [151]
3 years ago
9

A train rolls to a stop along a horizontal track without the conductor applying the brakes. What answer choice BEST explains why

this occurred?
A) The train ran out of momentum.
B) The opposing force of friction stopped the train.
C) The natural state of the train is not to be in motion.
D) The force of gravity slowed the train until it stopped.
Physics
1 answer:
Naya [18.7K]3 years ago
4 0

Answer:

B

Explanation:

Friction always eventually stops whatever is in motion.

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Answer:

v = 24 m/s, rightwards

Explanation:

Given that,

The mass of TBT explosive = 5 kg

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The law of conservation of momentum holds here. Let v be the final speed of the remaining piece. So,

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So, the final speed of the remaining piece is 24 m/s and it is in the right direction.

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A window in a skyscraper has a surface area of 3.50 m^2. Wind rushes by the outside of the window at 17.4 m/s, while inside the
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The difference in the pressure between the inside and outside will be 369.36 N/m²

<h3>What is pressure?</h3>

The force applied perpendicular to the surface of an item per unit area across which that force is spread is known as pressure.

It is denoted by P. The pressure relative to the ambient pressure is known as gauge pressure.

The given data in the problem is;

dP is the change in the presure=?

Using Bernoulli's Theorem;

\rm  \rho\frac{V^2_{12}}{2} +P_1= \rho \frac{V^2_{22}}{2} +P_2 \\\\\ P_2-P_1=\rho \frac{v_2^2-v_1^2}{2} \\\\  P_2-P_1= 1.21 \times \frac{17.4^2-0}{2} \\\\  \triangle p=369.36 \ N/m^2

Hence, the difference in the pressure between the inside and outside will be 369.36 N/m²

To learn more about the pressure refer to the link;

brainly.com/question/356585

#SPJ1

3 0
2 years ago
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liubo4ka [24]
Speed v = initial speed u + acceleration a x time t 
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5. During an anti-bullying club meeting after school, a student mentions that a new student has joined your class at school. The
Oksana_A [137]

Answer:

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