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4 years ago

Why a body in uniform velocity is zero acceleration ?

Physics

1 answer:

seropon [69]4 years ago

4 0

Uniform velocity means no Net force and therefore no acceleration. Acceleration only happens when the velocity changes.

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The lens-makers’ equation applies to a lens immersed in a liquid if n in the equation is replaced by n2/n1. Here n2 refers to th

pickupchik [31]

Answer:

The focal length of the lens in water is $f_{water} = 262.68 cm$

The focal length of the mirror in water is $f =79.0cm$

Explanation:

From the question we are told that

The index of refraction of the lens material = $n_2$

The index of refraction of the medium surrounding the lens = $n_1$

The lens maker's formula is mathematically represented as

$\frac{1}{f} = (n -1) [\frac{1}{R_1} - \frac{1}{R_2} ]$

Where $f$ is the focal length

$n$ is the index of refraction

$R_1 and R_2$ are the radius of curvature of sphere 1 and 2 of the lens

From the question When the lens in air we have

$\frac{1}{f_{air}} = (n-1) [\frac{1}{R_1} - \frac{1}{R_2} ]$

When immersed in liquid the formula becomes

$\frac{1}{f_{water}} = [\frac{n_2}{n_1} - 1 ] [\frac{1}{R_1} - \frac{1}{R_2} ]$

The ratio of the focal length of the the two medium is mathematically evaluated as

$\frac{f_water}{f_{air}} = \frac{n_2 -1}{[\frac{n_2}{n_1} - 1] }$

From the question

$f_{air }$ = 79.0 cm

$n_2 = 1.55$

and the refractive index of water(material surrounding the lens) has a constant value of $n_1 = 1.33$

$\frac{f_{water}}{79} = \frac{1.55- 1}{\frac{1.55}{1.44} -1}$

$f_{water} = 262.68 cm$

The focal length of a mirror is dependent on the concept of reflection which is not affected by medium around it.

7 0

3 years ago

The battery of a flashlight develops 3 V, and the current through the bulb is 200 mA.What power is absorbed by the bulb?

Verizon [17]

Answer : The power absorbed by the bulb is, 0.600 W

Explanation :

As we know that,

Power = Voltage × Current

Given:

Voltage = 3 V

Current = 200 mA = 0.200 A

Conversion used : (1 mA = 0.001 A)

Now put all the given values in the above formula, we get:

Power = Voltage × Current

Power = 3V × 0.200 A

Power = 0.600 W

Thus, the power absorbed by the bulb is, 0.600 W

3 0

4 years ago

(Please Help, Will Give BRAINLIEST Answer)

Xelga [282]

Answer:

Explanation:

Initial gravitational energy = final kinetic energy + heat

mgh = KE + Q

(50 kg) (9.81 m/s²) h = 78400 J + 884000 J

h = 1960 meters

4 0

3 years ago

A 2.35 kg ball is attached to a ceiling by a3.53 m long string. The height of the room is5.03 m .The acceleration of gravity is

Studentka2010 [4]

Answer:-81.29 J

Explanation:

Given

mass of ball $m=2.35 kg$

Length of string $L=3.53 m$

height of Room $h=5.03 m$

Gravitational Potential Energy is given by

$P.E.=mgh$

where h=distance between datum and object

here Reference is ceiling

therefore $h=-3.53 m$

Potential Energy of ball w.r.t ceiling

$P.E.=2.35\times 9.8\times (-3.53)=-81.29 J$

i.e. 81.29 J of Energy is required to lift a ball of mass 2.35 kg to the ceiling

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3 years ago

A projectile is to be launched at an angle of 30° so that it falls beyond the pond of length 20 meters as shown in the figure.

marin [14]

Answer: A

Explanation:

I want my points so yea

4 0

2 years ago

Why a body in uniform velocity is zero acceleration ?​

Why a body in uniform velocity is zero acceleration ?