Volume calculation formula of bow Urgent, online, etc...

Fan minus triangle can ~ anyway, I always calculate like this~

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4. A formula for calculating the area of a semi ellipse
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6. Ellipse circumference calculation formula, not too complex, a calculation formula, but also explain!
7. How to find the perimeter of an ellipse when its area is known The courtyard of the unit is elliptical. We only know that the area is 19000 square meters. Can we work out the perimeter? That is, the length of the courtyard wall? If the energy is not here to ask, ah, there are no original drawings, many people can not go, depressed, tomorrow the boss will have the result, depressed,
8. Ellipse volume calculation formula How to calculate the volume (soil) of a semi elliptical pool?
9. If the vertex of parabola y = - x + 8x-12 is p, and the intersection of parabola y = - x + 8x-12 and X axis is C and D, what is the area of triangle PCD
10. Let the intersection of the parabola y = 4-x2 and the straight line y = 3x be A.B. point P moves from a to B on the arc of the parabola. (1) find the coordinates of point P when the area of the triangle PAB is the largest. (2) prove that the figure enclosed by the parabola y = 4-x2 and the straight line y = 3x is divided into two parts of equal area by the straight line x = a
11. Physics problems about motion After braking, a stops 36 meters ahead within 3 seconds, B stops after 1.5 seconds, B advances () A.9m B.36m C.18m D.72m
12. A physical problem with the nature of motion Does the velocity of horizontal uniform linear motion and vertical uniform linear motion keep the same Doesn't it mean that the velocity perpendicular to the direction of acceleration doesn't change
13. There is an aircraft flying at an altitude of 490m at a constant speed of 80m / s. when an object is dropped from the aircraft, how many meters is the distance between the object and the aircraft? The answer is 100 But I think the plane and the object are moving the same horizontal distance?
14. A question about sports physics When an object moves in a straight line with constant speed change, it is impossible that () A. The speed change in the first second is less than that in the second second B. The displacement in the first second is less than that in the second C. The average speed in the first second is equal to the average speed in the second second D. The displacement difference in the first and second seconds is equal to the displacement difference in the third and fourth seconds Please explain the reason, thank you
15. As shown in the figure, there is an object with a mass of M = 2kg at o on a smooth horizontal plane. The object is subjected to two horizontal forces, F1 = 4N, F2 = (2 + 2x) n, and X is the displacement of the object relative to O. the object starts to move from rest. Question: (1) when the displacement is x = 0.5m, what is the acceleration of the object? (2) Where is the maximum acceleration of the object? What is the maximum value? (3) Where is the object's maximum velocity? What is the maximum value?
16. How to judge whether an object's trajectory is a straight line or a parabola?
17. It is proved that the trajectory of an object in horizontal motion is a parabola
18. Is the trajectory of projectile a parabola? It's not a flat throw
19. (consult physics expert) when the force of an object meets what conditions, the trajectory is a parabola (part of)?
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