A 500 g mass is tied to a string and swung in a horizontal circle with a radius of 40 cm. The speed of the mass is held constant, and the period of rotation is 0.7 s. What is the speed of the mass

wire in brush may conduct electricity from cell to drill and vice versa electrc shock possible

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me

the answer is false. this is because for ice to melt, it requires latent heat of melting. latent heat means heat energy required to change phase without any increase in temperatures. therefore, the ice will take energy from the environment to melt hence atmospheric temperatures will reduce.

it is the mirror/flat mirror

explanation: