Plz help a smol bean out (no links btw)
1 answer:
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Answer:
The difference in the length of the bridge is 0.42 m.
Explanation:
Given that,
Length = 1000 m
Winter temperature = 0°C
Summer temperature = 40°C
Coefficient of thermal expansion
We need to calculate the difference in the length of the bridge
Using formula of the difference in the length
Where, = temperature difference
=Coefficient of thermal expansion
L= length
Put the value into the formula
Hence, The difference in the length of the bridge is 0.42 m.
Answer:
e) 120m/s
Explanation:
When the ball reaches its highest point, its velocity becomes zero, meaning
.
where is the initial velocity.
Solving for we get
which is the time it takes the ball to reach the highest point.
Now, after the ball has reached its highest point, it turns around and falls downwards. After time since it had reached the highest point, the ball has traveled downwards and the velocity
it has gained is
,
and we are told that this is twice the initial velocity ; therefore,
which gives
Thus, the total time taken to reach velocity is
This , we are told, is 36 seconds; therefore,
and solving for we get:
which from the options given is choice e.
Answer:
The angle of separation is
Explanation:
From the question we are told that
The angle of incidence is
The refractive index of violet light in diamond is
The refractive index of red light in diamond is
The wavelength of violet light is
The wavelength of red light is
Snell's Law can be represented mathematically as
Where is the angle of refraction
=>
Now considering violet light
substituting values
Now considering red light
substituting values
The angle of separation between the red light and the violet light is mathematically evaluated as
substituting values