15) Which of the following substances possess the highest elasticity? a) Rubber b) Glass c) Steel d) Copper 16) A player kicks up a ball at an angle α with the horizontal. The hori... 15) Which of the following substances possess the highest elasticity? a) Rubber b) Glass c) Steel d) Copper 16) A player kicks up a ball at an angle α with the horizontal. The horizontal range is maximum when α is equal to: a) 30° b) 45° c) 60° d) 90° 17) Time taken by the projectile to complete its trajectory is called: a) Time of ascent b) Time of descent c) Time of flight d) Range 18) From the following equation, which is not a kinematical equation? a) v = u + at b) s = ut + 1/2 at² c) v² = u² + 2as d) v² = s + u²/t 19) A force of 100 N produces a change of 0.1% in a length of wire of area of cross-section 1 mm². Young's modulus of the wire is: a) 10⁵ N/m² b) 10⁹ N/m² c) 10¹⁰ N/m² d) 10¹² N/m²
Understand the Problem
The questions are testing knowledge in physics, specifically in the areas of elasticity, projectile motion, kinematics, and Young's modulus. Each question is a multiple-choice question asking for the correct answer among given options.
Answer
15) Steel. 16) 45°. 17) Time of flight. 18) v² = s + u²/t. 19) 10¹¹ N/m².
- Steel. 16) 45°. 17) Time of flight. 18) v² = s + u²/t. 19) 10¹¹ N/m².
Answer for screen readers
- Steel. 16) 45°. 17) Time of flight. 18) v² = s + u²/t. 19) 10¹¹ N/m².
More Information
Steel has the highest modulus of elasticity and is thus the most elastic. A projectile achieves maximum range when launched at a 45° angle. The complete trajectory of a projectile is referred to as the 'time of flight'. The equation v² = s + u²/t is not standard in kinematics. Using the formula for Young's modulus, the value for the wire is calculated to be 10¹¹ N/m².
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