Answer:
90 km/h
Explanation:
we just divide the distance by the time to get the speed.
Answer
Given,
Periscope uses 45-45-90 prisms with total internal reflection adjacent to 45°.
refractive index of water, n_a = 1.33
refractive index of glass, n_g = 1.52
When the light enters the water, water will act as a lens and when we see the object from the periscope the object shown is farther than the usual distance.
Answer:
43.46 m/
Explanation:
Two forces will be acting on her at the bottom point of the rollar coaster,
One will be mg (vertically downwards) and other will be ma(vertrically upwards) due to the centripetal force .
So, taking the resultant of the forces , we will get
ma-mg = 1750 (Given)
m(a-g) = 1750
52(a-g) = 1750
a-9.81 = 33.65
a = 43.46
Answer:
18 ohms
Explanation:
V = I(R1 + R2)
5V = (0.167A)(12 ohms + R2)
Solving for R2
R2 = 18 ohms
Displacement and distance are two different things, distance is the total distance traveled, this would be easy in the case of the ant, that would simply be 15+25= 40cm.
But, displacement is the 'birds eye' distance between two points, in this question it can be worked out using Pythagoras. (there is a right angled triangle) imagine the base of this triangle is the east direction and north being the upright. then the displacement would be the largest side of the triangle, or the hypotenuse.
Pythagoras said that A^2 + B^2 = C^2
where C is the hypotenuse.
so 15^2 + 25^2 = C^2
C^2 =850
simply square root this to get C
sqrt(850) = 29.15 cm
29.15 cm displaced by the ant