Leda drop a ball from three different heights, shown. for each drop, she calculate what the kinetic energy of ball would be when it hits the ground. the table shows her data. lesha says that a ball drop from a height of 3.0 meter would have less than 96 joules of kinetic energy when it hits the ground. is she correct and why

Aparticle travels in a circular orbit of radius 21 m. its speed is changing at a rate of 23.1 m/s2 at an instant when its speed is 37.2 m/s. what is the magnitude of the acceleration (in m/s? ) of the particle?

Asteam power plant operates on an ideal reheat rankine cycle between the pressure limits of 15 mpa and 10 kpa. the mass flow rate of steam through the cycle is 12 kg/s. steam enters both stages of the turbine at 500°c. if the moisture content of the steam at the exit of the low-pressure turbine is not to exceed 10 percent, determine (a) the pressure at which reheating takes place, (b) the total rate of heat input in the boiler, and (c) the thermal efficiency of the cycle. also, show the cycle on a t-s diagram with respect to the saturation lines. (2.15 mpa; 45.0 mw; 42.6%)

If the chemical properties of a substance remain unchanged and appearance or shape of a substance changes it is called a ?