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2 years ago

Assuming no air resistance, all projectiles have:

Physics

1 answer:

MaRussiya [10]2 years ago

4 0

Answer: Option C

C) accelerated vertical motion and constant horizontal motion.

Explanation:

If there is no air resistance then during the projectile movement the only force that causes an acceleration is the gravitational force.

We know that this force produces an acceleration of 9.8 m / s ^ 2 in the projectile.

As the gravitational force attracts the object towards the earth, then the acceleration that this force produces is always in the vertical direction. In the horizontal direction the object is not accelerated (because there is no air resistance).

Therefore the correct answer is option C.

"accelerated vertical motion and constant horizontal motion".

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n noisy factory environments, it's possible to use a loudspeaker to cancel persistent low-frequency machine noise at the positio

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Answer:

7.888m

Explanation:

Given:

frequency 'f'= 90Hz

velocity of the sound 'v' = 340 m /sec

The wavelength of the wave is given by,

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λ= 3.777m

The destructive interference condition is givn by

Δd= $(m+\frac{1}{2} )$ λ

where, m=0,1,2,3,..

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Δd= $(0+\frac{1}{2} )$ x 3.777

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3 years ago

Mass and Weight: What is the mass of an object that experiences a gravitational force of 685 N near Earth's surface where g

11Alexandr11 [23.1K]

Answer:

m = 69.9 kg

Explanation:

The mass and the weight of an object are two different quantities. Mass is basically the amount of matter that is present in a body. It remains same everywhere in the universe and measured in kilograms.

Weight is basically a force. It is the force by which earth attracts everything towards itself. The weight of an object changes from planet to planet, with the change in value of the gravitational acceleration (g).

Therefore, the relation between mass and weight of an object is given by the following formula:

W = mg

m = W/g

where,

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Therefore,

m = (685 N)/(9.8 m/s²)

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3 years ago

3. If a pipe with flowing water has a cross-sectional area nine times greater at point 2 than at point 1, what would be the rela

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Answer:

The velocity of the flow at point 1 is nine times greater than the velocity at point 2.

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We know that the same volume of water entering through point 1 must exit through point 2.

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$V_{flow}=v*A\\ where:\\V_{flow}= flow [m^3/s]\\v=velocity[m/s]\\A=area [m^2]$

If $A_{2}=9*A_{1} \\$

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$v_{1} *A_{1} = v_{2} *A_{2} \\v_{1} *A_{1} = v_{2} *9A_{1} \\\\v_{1} = 9v_{2} \\$

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