Bells University of Technology, Ota Phy101 Mechanics Tutorial Questions Assume acceleration due to gravity \( \mathrm{g}=10 \mathrm{~m} / \mathrm{s}^{2} \) 1. A stone strikes the ground with a speed of \( 25 \mathrm{~m} / \mathrm{s} \). (a) from what height was it released. (b) How long was it falling? (c) If the stone is thrown down with a sped of \( 10 \mathrm{~m} / \mathrm{s} \) from the same height, then what will be its speed just before hitting the ground? 2. A ball is thrown upward with a speed of \( 19.6 \mathrm{~m} / \mathrm{s} \). (a) how high does it go until its upward speed decreases to zero. (b) How long does the ball take in this upward trip? (c) How long does the ball take to return to the initial position? (d) What will be its velocity then?

El péndulo de un reloj está formado por una varilla de 500 gy 60 cm . de longitud y una lenteja en forma esférica de 200 g de masa y 5 cm . de radio. Determina la posición de su centro de masa respecto del extremo de la varilla. (A) \( 0,46 \mathrm{~m} \)

Question ix. An ideal gas is enclosed in a cylinder which has a movable piston. The gas is heated, resulting in an increase in temperature of the gas, and work is done by the gas on the piston so that the presure remains constant. a) Is the work done by the gas negative, positive or zero? b) From a microscopic view, how is the internal energy of the gas molecules affected? c) Is the heat less than, greater than or equal to the work? Explain you answer.

Sebuah mobil bermassa 1200 kg bergerak dengan kecepatan \( 20 \mathrm{~m} / \mathrm{s} \). Mobil tersebut kemudian direm hingga berhenti setelah menempuh jarak 50 meter. Berapakah gaya pengereman yang bekerja pada mobil tersebut?

A 1 km long goods train is running at a speed of 45 \( \mathrm{~km} / \mathrm{h} \). The time taken by this goods train to pass through a 2 km long tunnel is: \( \begin{array}{ll}\text { (A) } 1 \text { minute } & \text { (B) } 2 \text { minutes } \\ \text { (C) } 3 \text { minutes } & \text { (D) } 4 \text { minutes }\end{array} \)

Una rueda girar con una aceleración angular constante de \( 28,0 \frac{\mathrm{rad}}{\mathrm{s}^{2}} \) durante \( 14,3 \mathrm{~s} \) ¿Cuál es la magnitud de la velocidad angular final en rpm ?