The radii of three brass spheres are 3m respectively. 4 m and 5 m. Melted them and made a big ball...

A solid spherical ball of iron with radius 6 cm is melted and recase tin to three solid spherical balls . The radii of the two of the balls are 3 cm and 4 cm respectively determine the diameter of the third ball.

The inner and outer radii of a circular track area respectively 21 m and 28 m. The cost of levelling the track at ₹ 5 per sq m is

A spherical ball of radius 3 cm is melted and recast into three spherical balls. The radii of the two of the balls are 1.5 cm and 2 cm respectively. Determine the diameter of the third ball.

The inner and outer radii of a circular track are respectively 21 m and 28 m. The cost of gravevelling the track at Rs. 5 per sq m is

The radii of the axle and the wheel are increased by 3 times and 5 times, respectively. The new M.A. advantage of the wheel and axle is

A sphere of radius 6 cm is melted and made three small spheres of radius 3 cm, 4 cm and r cm respectively, the value of r is ....................

A spherical ball of radius 3 cm is melted and recast into three spherical balls. The radii of two of the balls are 1.5 cm and 2 cm. Find the diameter of the third ball.

Three solid spheres of radii 3, 4 and 5 cm respectively are melted and converted into a single solid sphere. Find the radius of this sphere.

If the velocities of three molecules are 2 m/s, 3 m/s, 4m/s respectively. Then the mean velocity will be

Two brass spheres of diameter 10 cm and 1 cm are placed with their centres 50 cm apart. If the relative density of brass is 8.5, calculate the gravitational attraction between the spheres. If the brass spheres are replaced by lead spheres (relative density greater than brass) of same radii, will the force of attraction increase or decrease ? For earth Take R = 6.37 xx 10^(8) cm Mean density = 5.53 xx 10^(3) kg m^(-3)