A school has four sections of chemistry in class XII having40, 35, 45 and 42 students. The mean marks obtained inChemistry test are 50, 60, 55 and 45 respectively for the four sections, the over all average of marks per students is?

Anonymous User Maths IIT 13 Sep, 2018 1 Answer 1857 views



A ball is thrown upward with initial velocity v0 = 15.0 m/s atan angle of 30° with the horizontal. The thrower stands nearthe top of a long hill which slopes downward at an angle of20°. When does the ball strike the slope ?

Anonymous User IIT Physics 12 Sep, 2018 1 Answer 397 views


A small mass slides down a fixed inclined plane of inclination with the horizontal. 

The coefficient of friction is where x is the distance through which the mass slides down
and  is a constant. Then the speed is maximum after the mass covers a distance of?

Anonymous User Physics IIT 11 Sep, 2018 1 Answer 876 views











A mass m hangs with the help of a string wrapped around a pulley on a frictionless bearing. The pulley has mass m and radius R. Assuming pulley to be a perfect uniform circular disc, the acceleration of the mass m, if the string does not slip on the pulley, is?

Anonymous User Physics IIT 23 Aug, 2018 1 Answer 912 views







A car, starting from rest, accelerates at the rate f through a distance s, then continues at constant speed for time t and then decelerates at the rate f/2 to come to rest. If the total distance traversed
is 15 s, then what will be the value of s?

Anonymous User Physics IIT 21 Aug, 2018 1 Answer 222 views