The specific heat capacity of copper is 400j/kg/k. A piece if copper ball of mass 20g at 200 degrees Celcius is placed in a copper calorimeter of mass 60g containing 50g of water at 30degrees Celcius, ignoring heat losses, calculate the final steady temperature of the mixture. (Specific heat capacity of water =4.2j/g/k)

A2k pendulum has a speed of 1 m/s at a height of 1/2 meter

Ablock of mass m = 2.5 kg is attached to a spring with spring constant k = 740 n/m. it is initially at rest on an inclined plane that is at an angle of theta= 26 with respect to the horizontal, and the coefficient of kinetic friction between the block and the plane is uk = 0.17. in the initial position, where the spring is compressed by a distance of d = 0.16 m, the mass is at its lowest position and the spring is compressed the maximum amount. take the initial gravitational energy of the block as zero. the block's initial mechanical energy is 9.472 j.b. if the spring pushes the block up the incline, what distance l in meters will the block travel before coming to rest? the spring remains attached to both the block and the fixed wall throughout its motion.

List and describe three ways that humans can change ecosystems and three ways that humans can protect ecosystems.