A man throws balls with the same speed vertically upwards, one after the other at an interval of 2 seconds. What should be the speed of the throw so that more than two balls are in the sky at any time? (Given g = 9.8 m/s2)

Anonymous User Physics Laws of Motion and Friction 06 Jun, 2020 1 Answer 72 views


A stone is dropped from a minar of height h and it reaches after t seconds on earth. From the same minar if two stones are thrown (one upwards and other downwards) with the same velocity u and they reach the earth surface after t1 and t2 seconds respectively, then

Anonymous User Physics Laws of Motion and Friction 06 Jun, 2020 1 Answer 107 views









The first two terms of a geometric progression add up to 12. The sum of the third and the fourth terms is 48. If the terms of the geometric progression are alternately positive and negative, then the first term is

Anonymous User Maths Sequences and Series 05 Jun, 2020 1 Answer 57 views











A car starts moving rectilinearly, first with acceleration 5 m/s^2 (the initial velocity is equal to zero), then uniformly , and finaly , decelerating at the same rate, comes to stop.Total time of motion equals to 25 sec . The avg velocity during that time is equal to 72 km/hr .How long does the car move uniformly?

Anonymous User Physics 05 Jun, 2020 0 Answer 63 views















Number of particles crossing unit area perpendicular to X-axis in unit time is given by 

n = 

are number of particles per unit volume in the position x1 and x2. Find dimensions of D called as diffusion constant

Anonymous User Physics Units and Dimension 02 Jun, 2020 1 Answer 51 views



An object is dropped from the top of the tower of height 156.8 m and the same time another object is thrown vertically upward with velocity of 78.1 mm/s from the foot of the tower, find when and where two object meet?

Anonymous User Physics Kinematics 01 Jun, 2020 1 Answer 133 views

A cannon fires successively two shells from the same point with velocity v0 = 250m/s ; the first at the angle  =60° and the second at the angle  =45° to the horizontal, the azimuth being the same. Neglecting the air drag, find the approximate time interval between firings leading to the collision of the shells (g = 9.8 m/s2.)

Anonymous User Physics 01 Jun, 2020 1 Answer 53 views

A block of mass m is pulled on an incline surface having coefficient of friction  = 1 & angle of inclination  = 30°, with the horizontal, such that required external force is minimum. The angle made by this force with the incline is :

Anonymous User Physics 01 Jun, 2020 1 Answer 55 views


Each of the two block shown in the figure has mass m. The pulley is smooth and the coefficient of friction for all surfaces in contact is . A constant horizontal force P applied in two cases shown in such a way that block A start just sliding then the value of minimum force P in case-I and case-II is :

Each of the two block shown in the figure has mass m. The pulley is smooth and the coefficient of friction for all surfaces in contact is . A constant horizontal force P applied in two cases shown in such a way that block A start just sliding then the value of minimum force P in case-I and case-II is :

Anonymous User Physics 01 Jun, 2020 1 Answer 52 views