No-till farming to conserve soil fertility because
a) remnants of the previous crop are left to slowly decay
b) deep ridges are cut across, not down, the slopes of hills
c) the ground is carefully turned to mix soil nutrients
d) only organic fertilizers and natural pesticides are used

Determine the maximum r-value of the polar equation r =3+3 cos 0

Acar travels in reverse. it covers 150 meters in 12 seconds what is the velocity of the car what is the speed of the car

The frequency of a tuning fork can be found by the method shown. a long tube open at both ends is submerged in a beaker of water, and the vibrating tuning fork is placed near the top of the tube. the length l of the air column is adjusted by moving the tube vertically. the sound waves generated by the fork are reinforced when the length of the air column corresponds to one of the resonant frequencies of the tube. the smallest value for l for which a peak occurs in sound intensity is 7 cm. l what is the frequency of the tuning fork? the speed of sound in air is 345 m/s. answer in units of hz