Solutions: Motion and Time – Grade VII Below are the solved questions from the Motion and Time assignment. Each answer is presented in detail for better understanding. Q1. Answer Briefly a. The distance-time graph of an object is a horizontal line parallel to the time axis when the object is at rest. Answer: When the …
Alternative Direct Substitution Approach Start from the given equation: [ costheta + sintheta = sqrt{2}costheta. ] Rearranging, we get: [ sintheta = (sqrt{2}-1)costheta. ] Now consider what we need to prove: [ costheta – sintheta = sqrt{2}sintheta. ] Substitute (sintheta = (sqrt{2}-1)costheta) into the left-hand side: [ costheta – sintheta = costheta – (sqrt{2}-1)costheta = …
Physics MCQs – Batch 1 & 2 1. What is thrust? Force exerted by an object in motion. Pressure applied by an object on a surface. Force exerted on a surface by an object, equal to its weight. (Correct) A gravitational pull experienced by objects on Earth. Correct Answer: Force exerted on a surface by …
Physics Numericals Q1: Convert 1 mm of Hg into Pascal. (Take density of Hg = (13.6 times 10^3 , text{kg/m}^3) and ( g = 9.8 , text{m/s}^2 )). Solution: Given: Height of mercury column: ( h = 1 , text{mm} = 0.001 , text{m} ) Density of mercury: ( rho = 13.6 times 10^3 , …
“`html Physics Numericals Q11: (a) The diameter of neck and bottom of a bottle are 2 cm and 10 cm respectively. The bottle is completely filled with oil. If the cork in the neck is pressed in with a force of 1.2 kgf, what force is exerted on the bottom of the bottle? Solution: Given: …
“`html Physics Numericals Q6: The pressure of water on the ground floor is 40,000 Pa, and on the first floor is 10,000 Pa. Find the height of the first floor. (Take: Density of water = (1000 , text{kg/m}^3), ( g = 10 , text{m/s}^2 )). Solution: Given: Pressure difference: ( Delta P = 40,000 – …
“`html Physics Numericals Q1: A hammer exerts a force of 1.5 N on each of the two nails A and B. The area of cross-section of tip of nail A is 2 mm² while that of nail B is 6 mm². Calculate pressure on each nail in pascal. Solution: Given: ( F = 1.5 , …
Set 3: Atomic Structure and Chemical Bonding Q4. (i) Name an element that does not contain a neutron. (ii) If an atom contains one electron and one proton, will it carry any charge or not? Q5. On the basis of Thomson’s model of an atom, explain how an atom as a whole is neutral. Q6. …
ICSE Class 9 Chemistry: Atomic Structure and Chemical Bonding Practice Questions Set 1: Atomic Structure and Related Concepts 1 Mark Questions Fill in the blanks with the correct choice given in brackets: If an element has two electrons in its outermost shell, then it is likely to be a _____ [Metallic / Non-metallic]. The first …
Understanding the Convex Mirror Formula: FAQs and Applications Published on: December 16, 2024 Introduction The convex mirror formula is a fundamental concept in optics, relating object distance (u), image distance (v), and focal length (f). Mastery of this formula is essential for solving problems involving convex mirrors. Frequently Asked Questions 1. What is the mirror …
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