F force
I current
L length of wire in magnetic field
B magnetic field strength
θ angle between wire and magnetic field
if θ = 90°
Answer:
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Explanation:
Let n be the number of the vernier scale division which coincides with the main scale division. Rotate the vernier caliper 90° and repeat the steps 4 and 5 for measuring the internal diameter in perpendicular direction. To measure the depth, find the total reading and zero correction.
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Answer:
below the horizontal.
Explanation:
This is a projectile motion problem. So we are going to use uniform motion and free-fall formulas.
Since what we want is the angle of the diver when hitting the water, we are going to search for the components of the final velocity and with them compute the angle.
For the free-fall part we know:
- ,
- ,
- (remember that the initial velocity in the vertical component is zero because at the begining he only has horizontal velocity).
For the uniform motion part:
Notice that we already have the final velocity in the x coordinate (uniform motion means that the velocity is constant).
For the final velocity in y coordinate we are going to use:
,
since we get
,
,
,
.
Now we can find the angle using the tangent function and the components of the final velocity. Remember that they are related as follow:
,
where is the angle below the horizontal (the angle we are searching for).
We have that
.
Explanation:
Given:
v₀ = 0 m/s
v = 49 m/s
a = 9.8 m/s²
Find: t
v = at + v₀
49 m/s = (9.8 m/s²) t + 0 m/s
t = 5 s
Answer:
C
Explanation:
Two or more identical waves moving in opposite directions