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Distinguish between speed and velocity. - Physics Cbse class 11 1 AnswerUnder what condition(s) is the magnitude of average velocity of an object equal to its average speed? - Physics Cbse class 11 1 AnswerThe ratio of flight speed to the exhaust velocity for maximum propulsion efficiency is GATE-Aerospace Engineering-Question-20120 AnswerDefine and state the difference between Phase velocity and group velocity. engineering physics1 AnswerA wheel 0.5 m in radius is moving with a speed of 12 m/s. Find its angular speed. -Physics Cbse class 11 1 AnswerGive the Relation between phase velocity and group velocity.-engineering physics1 AnswerGive the relation between group velocity and particle velocity.engineering physics1 AnswerA hoop of radius r and mass m rotating with an angular velocity ω0 is placed on a rough horizontal surface. The initial velocity of the centre of the hoop is zero. What will be the velocity of the centre of the hoop when it ceases to slip ? - physics 20130 AnswerA police car with a siren of frequency 8 kHz is moving with uniform velocity 36 km/hr towards a tall building which reflects the sound waves. The speed of sound in air is 320 m/s. The frequency of the siren heard by the car driver is - jee main 2012 physics 1 AnswerAbdul, while driving to school, computes the average speed for his trip to be 20 km h-1. On his return trip along the same route, there is less traffic and the average speed is 30 km h-1. What is the average speed for Abduls trip? - Physics Cbse class 11 1 AnswerThe kinetic energy of an object of mass, m moving with a velocity of 5 ms-1 is 25 J. What will be its kinetic energy when its velocity is doubled? What will be its kinetic energy when its velocity is increased three times? - Physics Cbse class 11 1 AnswerA 100 m sprinter uniformly increases his speed from rest at the rate of ----------Physics CBSE class 11 20160 AnswerA bus decreases its speed from 80 km h-1 to 60 km h-1 in 5 s. Find the acceleration of the bus. - Physics Cbse class 11 1 Answer Light enters from air to glass having refractive index 1.50. What is the speed of light in the glass? The speed of light in vacuum is 3 × 108 m/s. -CBSE Physics 1 AnswerThe pressure and velocity at the throat of a Venturi tube, measuring the flow of a liquid, are related to the upstream pressure and velocity, respectively, as follows: GATE-Instrumentation-Engineering-20141 AnswerTwo objects of masses 100 g and 200 g are moving along the same line and direction with velocities of 2 m s-1 and 1 m s-1, respectively. They collide and after the collision, the first object moves at a velocity of 1.67 m s-1. Determine the velocity of the second object. - Physics Cbse class 11 1 AnswerAn object experiences a net zero external unbalanced force. Is it possible for the object to be travelling with a non-zero velocity? If yes, state the conditions that must be placed on the magnitude and direction of the velocity. If no, provide a reason. - Physics Cbse class 11 0 AnswerTwo objects, each of mass 1.5 kg are moving in the same straight line but in opposite directions. The velocity of each object is 2.5 m s-1 before the collision during which they stick together. What will be the velocity of the combined object after collision? - Physics Cbse class 11 1 AnswerA ball is gently dropped from a height of 20 m. If its velocity increases uniformly at the rate of 10 ms-2, with what velocity will it strike the ground? After what time will it strike the ground? - Physics Cbse class 11 1 Answer A train travels a distance of 300 km at a uniform speed. If the speed of the train is increased by 5km an hour, the journey would have taken two hours less. Find the original speed of the train. CBSE Mathematics1 Answer