We want our students to understand the basic and advanced concepts of class 8 science - that is why our lectures are live and not pre-recorded. Find a the speed acquired, b the distance travelled. A racing car has a uniform acceleration of 4 m s-2. After what time will it strike the ground? Average accleration is + or — depending on direction. Answer None of the statement is true for displacement First statement is false because displacement can be zero. Find its rate of acceleration. Slowly it grows and develops into a separate individual.
An object has moved through a distance. F g Fertilization is necessary even in asexual reproduction. Distinguish between speed and velocity. This happens when final position of the object coincides with its initial position. Indicate whether the following statements are True T or False F : a Oviparous animals give birth to young ones. Apart from these three methods the intrauterine contraceptive devices are used to prevent pregnancies.
Thus, they were never at the same point on road. . What does the path of an object look like when it is in uniform motion? Give the equation for uniform motion. All these topics have been taught with the help of theorems and solved examples making the learning process more interesting and comprehensive. A bus starting from rest moves with a uniform acceleration of 0. Has well defined limbs and other body parts. Second statement is also false because displacement is less than or equal to the distance travelled by the object.
Speed is given by the relation: Velocity is given by the relation: The speed of an object can never be negative. Graphical representation of motion, derivation of three equation of motion and numerical based on equation of motion. The embryo, once attached to uterus gradually develops various body parts such as hands, legs, head, eyes, etc into an embryo. It is called binary fission, e. It has only magnitude without direction. Let the velocity of the body at time t be v. What will be the distance covered and the displacement at the end of 2 minutes 20 s? A ball is gently dropped from a height of 20 m.
Which of the two cars travelled farther after the brakes were applied? That means, after 2 min 20 s, the farmer will be at the opposite end of the starting point. What is the nature of the distance-time graphs for uniform and non-uniform motion of an object? Distinguish between speed and velocity. Distance travelled by the bus is 720 m. How does reproduction help in providing stability to populations Of species? Another term for the fertilized egg. During adolescence various changes occur in the body of humans. Go for the answers on or or or or or go for Solutions.
What was the distance of the spaceship from the ground station? Chemical methods: The chemical methods make use of specific drugs by females. Question 7 In which female reproductive organ does the embryo get embedded? After what time will it strike the ground? For example, an object starts from point A and after covering a distance of say 50 meters, reaches at point B. Answer a Object B b No c 5. Answer: Sexual reproduction leads to new combination Of genes as it involves two parents and meiosis. Here after, it again moves back to point A.
Second statement is also false because displacement is less than or equal to the distance travelled by the object. The car stops in 5 s. Frogs and insects are examples of organisms showing metamorphosis. Can displacement be zero even when distance is not zero? The part of the graph in red colour between time 6 s to 10 s represents uniform motion of the car. Answer : Let us assume An artificial satellite, which is moving in a circular orbit of radius 42250 km covers a distance 's' as it revolve around earth with speed 'v' in given time 't' of 24 hours. Answer If distance time graph is a straight line parallel to the time axis, the body is at rest. Answer: The rate Of birth and death in a given population determine its stability.
An athlete completes one round of a circular track of diameter 200 m in 40 s. It is generally observed in very small sized organisms. Answer: iii two fused nuclei. Since the diameter of the circular park is 200 metre, his displacement after 140 sec is 200 metres. Less numbers of eggs are produced.
. The solutions given for these topics will help the learners to further imbibe the concept as they are guided and are given in step by step manner. Find a the speed acquired, b the distance travelled. Other than given exercises, you should also practice all the solved examples given in the book to clear your concepts on Quadrilaterals. Find how far the train will go before it is brought to rest. F e Egg laid after fertilization is made up of a single cell. It involves the fusion of the male and the female gamete outside the female body.