Suppose eratosthenes had found that, in alexandria, at noon on the first day of summer, the line to the sun makes an angle 30° with the vertical. what, then, would he have found for earth’s circumference?

An object thrown vertically upward from the surface of a celestial body at a velocity of 36 m/s reaches a height of sequalsminus0.9tsquaredplus36t meters in t seconds. a. determine the velocity v of the object after t seconds. b. when does the object reach its highest point? c. what is the height of the object at the highest point? d. when does the object strike the ground? e. with what velocity does the object strike the ground? f. on what intervals is the speed increasing?

Free runners jump long distances and land on the ground or a wall. how do they apply newton’s second law to lessen the force of impact?

Which feature of a heating curve indicates a change ofn state