Paheli observed the shadow of a tree at 8: 00 a. m., 12: 00 noon and 3: 00 p. m. which of the following statements is closest to her observation about the shape and size of the shadow? (a) the shape of the shadow of the tree changes but the size remains the same. (b) the size of the shadow of the tree changes but the shape remains the same. (c) both the size and shape of the shadow of the tree change. (d) neither the shape nor the size of the shadow changes.

25pts the diagram shows the positions of the sun, moon and earth during spring tides, when the high tides are at their highest and low tides at their lowest. what is it about these positions that causes these high and low tides?

Oxygen and nutrients are moved through the body by the: a. circulatory system c. lymphatic system b. digestive system d. reproductive system

Aperson stands on a platform, initially at rest, that can rotate freely without friction. the moment of inertia of the person plus the platform is ip. the person holds a spinning bicycle wheel with its axis horizontal. the wheel has moment of inertia iw and angular velocity ωw. take the ωw direction counterclockwise when viewed from above. part a what will be the angular velocity ωp of the platform if the person moves the axis of the wheel so that it points vertically upward?