Why are scientific theories modified, but seldom discarded?

a baseball pitcher throws a fastball at 98 mph. he also has a slower "changeup" pitch, 75 mph, which he throws identically, same windup and same release angle from shoulder height. which pitch gets to home plate with a flatter trajectory ... i.

How is velocity different from speed

What is the magnitude of velocity called?

What is the charge on a hypothetical ion with 35 protons and 33 electrons?

At the System Demo, each team demonstrates their own work but the system is not integrated. They say they underestimated the integration effort, but they cannot integrate every Iteration and meet the planned scope.

Which of the following occurs in meiosis that does not occur in mitosis 1 fertilization occur 2 body cells are made 3 sex cells are made 4 cell division occurs

A hot air balloon is hovering in the air when it drops a 40 Kg food package to some lost golfers. If the package is dropped from an altitude of 500 m and air resistance can be neglected, how fast is the package moving when it hits the ground?

you often hear people particularly TV announcers talk about "high rate of speed" what do you think they mean according to the specifics of physics definitions what are they really saying

What is the value of x in the equation Ix - 3y = 30, when y = 15?

32. How much work is done pushing an 80 N box 2 m across ue surtout What work is done? a. 40 J c. 160 J b. 20 J d. 240 J