I have no idea how to answer this, please help! 4. A power station generates electrical energy at a p. d. of 25,000V and a rate (power) of 500 MW. (1MW = 1,000,000W)
a) What is the current leaving the power station?
b) How much energy is generated in one day?
c) If the efficiency of the power station is 40 %, how much energy is wasted every
Day?

Order the sequence of ideas that lead to marie curies discovery of radioactive elements number the events in chronological order starting with the oldest

Glass has a hardness that is in the middle of the hardness scale. what is the hardness of glass?

The base of a 50-meter tower is at the origin; the base of a 50-meter tree is at (0, 50, 0). the ground is flat and the z-axis points upward. the following parametric equations describe the motion of six projectiles each launched at time t = 0 in seconds. (i) r (t) = (50 + t2)k (ii) r (t) = 2t2 j + 2t2k (iii) r (t) = 50 i + 50 j + (50 − t2)k (iv) r (t) = 2t j + (50 − t2)k (v) r (t) = (50 − 2t) i + 2t j + (50 − t)k (vi) r (t) = t i + t j + tk (a) which projectile is launched from the top of the tower and goes downward? at time t = , the projectile hits the ground at point (x, y, z) = . (b) which projectile hits the top of the tree?