What would be the position of the centre of mass? A circular uniform disk of radius R has a hole of radius r (r < R/2). The centre of the hole is R/2 from the centre of the disk. Surface density of the disk is σ. What would be the position of the centre of mass.?

How much work is done lifting a 9.10 kg box straight up onto a shelf that is 1.80 m high?

Molten iron fills a mould, which has a volume of 200 cm cubed. calculate the volume when the iron cools and solidifies.

An electric current is flowing through the cord below. what will happen to this current if a magnet is brought near the cord? a. the electric current will stop flowing. b. it will exert a force on the voltage. c. the resistance of the wire will decrease. d. it will exert a force on the electric current.