An antiaircraft shell is fired vertically upward with a muzzle velocity of 1000 m/s. Calculate: (a) The maximum height it can attain. (b) The time taken to reach this height. (c) The instantaneous velocities at the ends of 20 secs and 50 secs.​

When the velocity of an object is doubled, by what factor is its momentum changed? by what factor is its kinetic energy changed? a) the momentum is zero. b) the momentum is not zero. c) difficult to say.

The magnitude of the poynting vector of a planar electromagnetic wave has an average value of 0.939 w/m^2 . the wave is incident upon a rectangular area, 1.5 m by 2.0 m, at right angles. how much total electromagnetic energy falls on the area during 1.0 minute?

Which type of energy would have nothing to do with ironing clothes? a. heat b. chemical c. electrical d. mechanical