Answer: 10 km/s Spaceship speed = 36000 km/h In 1 hour spaceship travel = 36000 km We can say that in 60×60 second spaceship travel = 36000... View Article
Answer: Let the distance cover by Boojho be x km The speed of Boojho will be = (x/1) km/h Paheli also cover x km. Her speed will be = (x/2) km/h... View Article
Answer: Because Paheli and Boojho arrive at school at the same time but travel a different distance, we can argue that their speeds are... View Article
Answer: A point mass attached to a light inextensible string and suspended from fixed support is called a simple pendulum. The vertical line... View Article
Answer:Â (b) 7.2 Boojho home to school to again home From home to school distance is 3 km time taken is 30 min = (30/60) hour = 0.5 hour And in... View Article
Answer: (a) 5 m/s  Speed is defined as the rate of change of position of an object in any direction. Speed is measured as the ratio of distance... View Article
Answer:Â (d) 4(t1 + t2) A point mass attached to a light inextensible string and suspended from fixed support is called a simple pendulum. The... View Article
Answer:Â (a) A to B and back to A. A point mass attached to a light inextensible string and suspended from fixed support is called a simple... View Article
Answer: (c) S = 1/ T x D Speed is defined as the rate of change of position of an object in any direction. Speed is measured as the ratio of... View Article
Answer: (a) both A and B Since speed for A and B is constant, graph for A and B is a straight line as shown in the figure. A distance-time... View Article
Answer: (d) Blinking of eyes. Blinking the eye is not a periodic phenomenon. Eyes do not blink at a fixed interval of time. Hence Blinking of... View Article
Answer: We can identify the mirrors by forming images of an object which are given as below: In the case of a plane mirror, the image will... View Article
Answer: A convex lens is one that increases the size of the image as the distance between the object and the lens decreases which is a converging... View Article
Answer: Two possible ways in which the real image of a distant tree can be obtained are given below : Concave mirror Convex lens We can use a... View Article
Answer: In a convex lens, if the size of the image obtained on a screen is decreasing on moving the object, then the object is moving in a path... View Article
Answer: The lens is a convex lens if the letters appear magnified and the lens is concave if the image appears shortened. A convex lens... View Article