A boy of 150cm tall forms a shadow of length 200cm. A tree nearby forms a shadow of length 800cm. calculate the height of the tree. ​

During which interval are the persons represented by the graph not moving? a) 0 to 0.5 hrs b) 1.5 to 2 hrs c) 2 to 2.5 hrs d) 4.5 to 5 hrs

Find an expression for the electric field e⃗ at the center of the semicircle. hint: a small piece of arc length δs spans a small angle δθ=δs /r, where r is the radius. express your answer in terms of the variables q, l, unit vectors i^, j^, and appropriate constants.

Aschool bus takes 20 minutes to reach school from your house. if the average velocity of the bus is 15.0 km/h to the west, the displacement from your house is: a. 5 km to the west c. 5 km to the east b. 300 km to the west d. need more information