The document describes a physics worksheet with multiple choice and open-ended questions about measurement, projectile motion, circular motion, and dimensional analysis. Madan is curious to calculate the distance to the moon using parallax measurements from two points on Earth. The parallax method is used to solve this problem. In another example, A bets B that a bullet fired at a bird 4 km away could not hit the target, based on the maximum horizontal range equation for projectile motion.
The document describes a physics worksheet with multiple choice and open-ended questions about measurement, projectile motion, circular motion, and dimensional analysis. Madan is curious to calculate the distance to the moon using parallax measurements from two points on Earth. The parallax method is used to solve this problem. In another example, A bets B that a bullet fired at a bird 4 km away could not hit the target, based on the maximum horizontal range equation for projectile motion.
The document describes a physics worksheet with multiple choice and open-ended questions about measurement, projectile motion, circular motion, and dimensional analysis. Madan is curious to calculate the distance to the moon using parallax measurements from two points on Earth. The parallax method is used to solve this problem. In another example, A bets B that a bullet fired at a bird 4 km away could not hit the target, based on the maximum horizontal range equation for projectile motion.
The document describes a physics worksheet with multiple choice and open-ended questions about measurement, projectile motion, circular motion, and dimensional analysis. Madan is curious to calculate the distance to the moon using parallax measurements from two points on Earth. The parallax method is used to solve this problem. In another example, A bets B that a bullet fired at a bird 4 km away could not hit the target, based on the maximum horizontal range equation for projectile motion.
CLASS:XI Ans: measurement, the process of associating
SUBJECT:PHYSICS numbers with physical quantities and phenomena.
WORKSHEET:2 Measurement is fundamental to the sciences; to MULTIPLE CHOICE QUESTIONS engineering, construction, and other technical fields; 1. Which of the following pairs has the same dimensions? and to almost all everyday activities. (a) specific heat and latent heat (b) lmpulse and momentum 3. Define the horizontal range of the projectile. (c) surface tension and force Ans: The displacement in the horizontal direction is the (d) moment of lnertia and torque projectile's range. Because gravity only acts vertically, Ans(b)Impulse and momentum there is no acceleration in this direction. The range of 2. The dimensions of kinetic energy is the projectile, like the time of flight and maximum (a) [M 2L2T] (b) [ML 2T] height, is determined by the initial speed. (c) [ML 2T-2] (d) [ML 2T-1] 4. At what angle a ball must be thrown to get maximum Ans; (c) [ML 2T-2] horizontal range? 3. A body is traveling in a circle at constant speed. It Ans:45 degrees (a) has an inward acceleration 5. Why are the lubricants used in machines? (b) has constant velocity. Ans: Lubrication reduces friction and allows moving (c) has no acceleration (d) has an outward radial acceleration machine parts to slide smoothly past each other. ANSWER THE FOLLOWING /GIVE REASON: Ans: (a) has an inward acceleration 1. Why it is not possible to establish a physical relation 4. The dimensions of kinetic energy is same as that of involving more than three variables using the method of (a) force (b) pressure dimensions? (c) work (d) momentum Ans: (c) work Ans: If a quantity depends on more than three factors 5. The angular velocity depends upon the rate of change of than dimensional formula cannot be derived. the? 2. Can a particle accelerate when its speed is constant? (a) Angular acceleration (b) Angular Distance. Explain. (c) Angular Displacement. (d) torque Ans: If speed is constant, particle may still have an Ans: (a) Angular acceleration acceleration. e.g. in uniform circular motion, speed is ANSWER THE FOLLOWING: constant but as the direction of motion changes 1. Define light year. continuously, velocity changes and there is Ans: Light-year is the distance light travels in one acceleration. year. Light zips through interstellar space at 186,000 miles (300,000 kilometers) per second and 5.88 trillion 3. A stone dropped from the window of a stationary railway miles (9.46 trillion kilometers) per year. carriage takes 2 seconds to reach the ground. At what 2. What do you mean by the term measurement? time the stone will reach the ground when the carriage is moving with (a) the constant velocity of 80kmh-1(b) would give you Its.1000 otherwise you have to pay the constant acceleration of 2ms-2? same to me. A was sure that you can never hit that Ans: t = 2 h / g In both cases, the stone will fall through bird. However, killing a bird is not good for the the same height as it is falling when the railway environment. Assume the muzzle speed to be fixed, carriage is stationary. Hence, the stone will reach the and neglect air resistance ground after 2 seconds 1. Is betting a good practice? Ans: No 4. When a ball falls from a height its momentum increases. Ans: When a ball falls from a height its velocity increases due to acceleration of gravity. 5. When a high jumper leaves the ground, where does the force which accelerates the jumper upward comes from? Ans: When a high jumper leaves the ground, the jumper was forced upward by the ground, which is the force that causes the jumper to accelerate upward. CASE STUDY: 1. The professor of class X asked Madan and Prathiva to find the distance of the moon from the Earth. Pratibha said it is impossible to find. But Madan was excited to know. He observed the moon from two diametrically 2. How A is sure that the bullet could not hit the target? opposite points A and B on Earth. The angle q subtended Ans: Max horizonatal range = u2 g at the moon by the two directions of observation is 1°54′. Given the diameter of the Earth to be about (1.276 × [∵ muzzle velocityin fixed] 107 m). ie Rmax = u^2/ g = 2–√3= 3.464 km g 1. A.Which values arc depicted by Madan? So, the bullet can not hit the target which is 4 km Ans: The values depicted by Madan are : away. (a) Curiosity (b) Sincerity 3. Which values are depicted in the above question?. (c) Willing to know and implement the scientific ideas. 2. B. Which mathematical concept is used in the above problem? Ans: Values depicted are: 3. Ans: Parallax method (a) Concern for environment and living creature 2. A and B are the two students of class X. A fired a (b) Avoid betting bullet at an angle of 30° with the horizontal which (c) Intelligent hits the ground 3 km away. B told that I could hit a bird that is 4 km away by adjusting its angle of projection. A immediately betted, He told if you can I