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4 years ago

12

A rifle with a longer barrel can fire bullets with a larger velocity than a rifle with a shorter barrel. a) Explain this using t

he impulse-momentum theorem. b) Explain this using the work-energy theorem

1 answer:

n200080 [17]4 years ago

6 0

Its mainly about how much gunpowder is used in the shell. Thats all I got. XD

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Which type of friction force acts when there is no motion?

rosijanka [135]

Its called static friction.

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3 years ago

The magnitude of a vector can be positive or negative The magnitude of a vector can be less than the magnitude of one of its com

NARA [144]

Answer:

If magnitude of vector A is less than magnitude of vector B then its x-component will be also less

Explanation:

In first case magnitude can never be negative -ve sign shows the direction only so it is incorrect statement.

The magnitude of any vector can never be less than its component because component of vector is found with the multiplication of sine and cos angle which values lies between 0 and 1 so after multiplication it gives less value than the vector

If magnitude of any vector is less then its x component will also be less because magnitude of component is dependent on the magnitude of vector

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3 years ago

A toy car moves around a circular track at constant speed. It suddenly doubles its speed — a change of a factor of 2. As a resul

Zigmanuir [339]

Answer:

option B

Explanation:

given,

toy car is moving in circular track

speed is doubled— a change of a factor of 2

to find change in factor of acceleration

radius doesn't change

centripetal acceleration formula

= $\dfrac{v^2}{r}$

velocity is change in factor of 2

so acceleration will be change at the factor of

= $\dfrac{(2v)^2}{r}$

= 2² = 4

so the correct answer is option B

4 0

4 years ago

What types of areas are more prone to floods?

geniusboy [140]

Areas with poor drainage system

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3 years ago

A rope pulls a 20 kg box up. If the tension in the rope is 275 N, what is the acceleration of the box?

Nana76 [90]

Answer:

<h3>The answer is 13.75 m/s²</h3>

Explanation:

The acceleration of an object given it's mass and the force acting on it can be found by using the formula

$a = \frac{f}{m} \\$

f is the force

m is the mass

From the question we have

$a = \frac{275}{20} = \frac{55}{4} \\$

We have the final answer as

<h3>13.75 m/s²</h3>

Hope this helps you

4 0

3 years ago