. What is the approximate resolution of a circular microwave antenna having an aperture of 1 m and orbiting at an altitude of 800 km? Use a wavelength of 5 cm. (Resolution here means the diffraction-limited resolution: the diameter of the first zero crossing of the illumination pattern).

Mutt and jeff are running along a path each pushing a cart loaded with rocks. if mutt's wagon has a mass two times greater than jeff's and they want to stay together, arriving at their destination at the same time, what must happen? a) jeff should slow down so mutt can catch up. b) mutt must use half as much force to push his cart. c) mutt must use twice as much force to push his cart. d) mutt and jeff will use the same force, but mutt will take bigger steps.

Brutus, the dog, is pulling a bone to the left with a force of 20 n. lassie, another dog, is pulling a bone to the right with a force of 18n. what is the net force? a. b. c.

In which of the following is positive work done by a person on a suitcase