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3 years ago

Simplify the expression [9+2(2-4)]/3

Physics

1 answer:

il63 [147K]3 years ago

4 0

Answer:

5/3

Explanation:

[9+2(2-4)]/3

BODMAS

[9+2(-2)]/3

[9-4]/3

5/3

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A diamond is underwater; A light ray enters one face of the diamond, then travels at an angle of 30 degrees with respect to the

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According to snells law

n1 sin theta1 = n2 sin theta2
n1 = 1.333 (water)
n2 = 2.42 (diamond)
it is given that theta =30 degrees so
by putting the values we have

1.333 sin theta = 2.42 sin 30 

sin theta = (2.42/1.333) *0.5 =65.2 degree
so our conclusion is

the ray's angle of incidence θ1 on the diamond = 65.2 degree.
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3 years ago

A seagull flies at a velocity of 9.00 m/s straight into the wind. (a) if it takes the bird 20.0 min to travel 6.00 km relative t

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Here we will the speed of seagull which is v = 9 m/s

this is the speed of seagull when there is no effect of wind on it

now in part a)

if effect of wind is in opposite direction then it travels 6 km in 20 min

so the average speed is given by the ratio of total distance and total time

$v_{avg} = \frac{6000}{20*60}$

$v_{avg} = 5m/s$

now since effect of wind is in opposite direction then we can say

$V_{net} = v_{bird} - v_{wind}$

$5 = 9 - v_{wind}$

$v_{wind}= 4 m/s$

Part b)

now if bird travels in the same direction of wind then we will have

$v_{net}= v_{bird} + v_{wind}$

$v_{net} = 9 + 4 = 13 m/s$

now we can find the time to go back

$time = \frac{distance}{speed}$

$time = \frac{6000}{13}$

$time = 7.7 minutes$

Part c)

Total time of round trip when wind is present

$T = t_1 + t_2$

$T = 20 + 7.7 = 27.7 min$

now when there is no wind total time is given by

$T = \frac{6000}{9} + \frac{6000}{9}$

$T = 22.22 min$

So due to wind time will be more

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3 years ago

A net force, the magnitude of which is 3800 N, accelerates a 1260-kg vehicle for 10.0 s. The vehicle travels 50.0 m during this

Novay_Z [31]

Answer:

SEE EXPLANATION

Explanation:

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