A BMW car with mass of 12 tons accelerates from rest uniformly from rest up a gradient 1 of 3 and reaches as speed of \( 72 \mathrm{~km} / \mathrm{h} \) after 3 minutes Calculate 1.1. The acceleration of the BMW. 12. The kinetic energy that the BMW possess after 3 minutes 13. Potential eneray after 3 minutes

\( b= \) Expresar 40 kgf en N

A block weighing 500 N is at the point of just starting to move down a rough inclined plane when supported by a force of 200 N acting parallel to the plane in an upward direction. The same block, on the same rough inclined plane, is on the verge of moving up the plane when pulled by a force of 300 N acting parallel to the plane. Compute the inclination of the plane and the coefficient of friction between the inclined plane and the block.

ถ้า \( \overrightarrow{\mathrm{C}}=\overrightarrow{\mathrm{A}}+\overrightarrow{\mathrm{B}}, \overrightarrow{\mathrm{D}}=\overrightarrow{\mathrm{A}}-\overrightarrow{\mathrm{B}} \) และขนาดของ \( \overrightarrow{\mathrm{A}}, \overrightarrow{\mathrm{B}} \) และ \( \overrightarrow{\mathrm{C}} \) มีค่าเท่ากับ 5 นิวตัน, 7 นิวตัน และ 10 นิวตั ตามลำดับ จงหาขนาดของ \( \overrightarrow{\mathrm{D}} \)

Per stimare lo spessore di una moneta da 10 centesimi di misura con un righello l'altezza della pila di monete ot- tenuta. La misura e e \( (2,9 \pm 0,1) \mathrm{cm} \), dove \( 0,1 \mathrm{~cm} \) è la sen- sibilità del righello. - Stima lo spessore della moneta. \( \quad[(1,93 \pm 0,07) \mathrm{mm}] \)

Arus listrik sebesar 5 mA mengalir pada suatu kawat penghantar selama 0,1 sekon. Berapa besar muatannya ?