Home » HOTS
Category Archives: HOTS
Distance of closest approach of two ships problem
Two ships are 10 km apart on a line running south to north. The one farther north is steaming west at 20 km/h. The other is steaming north at 20 km/h. What is their distance of closest approach? How long do they take to reach it?
Asked Gayathri
Solution and Answer:
The main hindrance to solving problem is that students fail to visualize the situation.
Let’s represent the condition using a diagram.
Let the first ship steaming north be named A and the other B. The relative velocity of A with respect to B is 20 √2 south west. If we extend the line along the 45° south west from the initial position of A, the distance of closest approach is the perpendicular drawn from B to this line.
So, the distance of closest appraoch = 10 sin 45° = 10/√2 = 7.07 m
Time taken to reach the distance of closest approach = distance of closest approach / relative speed
= (10/√2)/(20 √2)
= 0.25 h
Human Eye and the Colorful World – An online test
Class X students can practice this online Fill in the Blanks test and get evaluated online instantly. The sentences are taken from NCERT Text Book. This is an excellent way of revising fast.
Click the link below to start
Fill in the Blanks Exercise from Human Eye and the Colorful World
HOTS – HIGHER ORDER THINKING SKILL FREE DOWNLOAD

eng.pdf

hindi.pdf 
sanskrit.pdf 
sanskrit1.pdf 
sanskrit_3.pdf 
maths.pdf 
science.pdf 
sst.pdf 
PHYSIC

atomic nucleihots8f.pdf
communication.pdf
dual nature of matter.pdf
em wavehots.pdf
semiconductor.pdf
unit10communication.pdf
unit1electrostatics.pdf
unit2current.pdf
unit3mag.pdf
unit4emi.pdf
unit5emwave.pdf
unit6optincs.pdf
unit7dual.pdf
unit9semiconductor.pdf

CHEMISTRY

chemistry.pdf

MATHEMATICS

homaths.pdf

COMPSc AND IP

HOTSCOMPSCIENCEXII.pdf
HOTSXIII.P.pdf

BIOLOGY 
UNIT6.pdf
UNIT7.pdf
UNIT8.pdf
UNIT9.pdf
UNIT10.pdf

You must be logged in to post a comment.