A machine gun has a mass of 20 kg. It fires a 35 g bullet at the rate of 400 bullets per minute with a speed of 400 m/s. What force must be
applied to the gun to keep it in position?

Joe is breeding cockroaches in his dorm room. he finds that the average wing length in his population of cockroaches is 4 cm. he chooses the six cockroaches that have the largest wings; the average wing length among these selected cockroaches is 10 cm. joe interbreeds these selected cockroaches. from earlier studies, he knows that the narrow-sense heritability for wing length in his population of cockroaches is 0.6. a. calculate the selection differential and expected response to selection for wing length in these cockroaches. b. what should be the average wing length of the progeny of the selected cockroaches?

Albinism is an inherited genetic disorder. explain what it is meant by inherited genetic disorder

When rutherford performed his metal foil experiment, he was surprised that most of the alpha particles