phvsks-Unsaved 19/9. Activity No. 5 FORCE AND MOTION 2. A constant force F=m1g/2F=mlg/2 is applied on the block of mass m2m2 as shown in the figure. The string and pulley are light and the surface of the table is smooth. Find the acceleration of m2m2. - AI10/., physics Unsaved f/OIEI'K'Z Activity No. Q WORK, ENERGY, POWER Tell whether a work is done or not and explain why. 1. A teacher applies a force to a wall and becomes exhausted. 2. A book falls off a table and free falls to the ground. 3. A waiter carries a tray full of meals above his head by one arm straight across the room at constant speed. (Careful! This is a very difcult question that will be discussed in more detail later.) Activity No. Q WORK, ENERGY, POWER Procedure: Read with comprehension and answer the questions and solve the problems. 1. A hiker has two options of going up the mountain top. One way is by taking the side of the mountain and the other by taking the vertical accent. If both ways lead to the same location to where the hiker must go, which one would require a greater amount of work? 2. Rel Willem is riding a MOA's {eraswheel In one complete rotation, what is the net force done by the wheel? 12:21 0 . 4 0 10% Activity No. 6 MOMENT OF A FORCE Procedure: Given the beam AB as shown, find the force F2 and its moment arm, d. F F= 15 N Ad 80 cm B 1.m..... F = 30 N FA= 50 N Activity No. 7 PRODUCTION AND PROPERTIES OF SOUND Procedure: Answer the questions briefly and solve problems critically. B. PROBLEMS 6. What are nodes? How many and how far apart are the nodes on a string 80cm long vibrating at 1600Hz assuming a wave velocity on the string of 320m/s? 7. What nature of a sound will a singer produce when he hits a note at a wavelength of 1.4 cm in a colder place where air temperature is 5C? Activity No. 9 C12:21 6 0 010% Activity No. 9 MAGNETISM B. Problems 6. A wire loop is bent into the shape of a square with each side of length 4.5 cm. The loop is placed horizontally on a tabletop with two of the sides oriented north/south and two of the sides oriented east/west. A battery is connected so that a current of 24 mA is produced around the loop; the current flows in the clockwise direction looking from the top. What is the force produced by the earth's magnetic field on each section of current-carrying wire? What is the overall torque on the loop? What would the torque be if the same length of wire were bent into a circle instead of a square (assuming the same current)? Procedure: 2.A velocity selector in a mass spectrometer uses a 0. 100-T magnetic field. a) What electric field strength is needed to select a speed of? b) What is the voltage between the plates if they are separated by 1.00 cm? 7. A proton is moving at 12% of the speed of light in the direction which is 20 degrees up from west. It passes through the earth's magnetic field which points due north with a strength of 0.5 x 10-4 T. What is the resultant force on the proton? What will the radius of curvature of its path be? C12:21 6 0 010% Activity No. 10 A ELECTRIC CIRCUIT Answer the following questions: 1. What is an electric circuit. Draw a sample schematic diagram. 2. Given 3 resistors in series connection of the same magnitude of loading, how much current passes through one of the resistors is 3 Volts and total current is 1 ampere? Show your solution. 3. Referring to question # 2, discuss the current that a resistor gets if the connection is parallel. 6 of 7 C12:21 0 010% Activity No. 10 SERIES and PARARLLEL CONNECTION OF RESISTORS Procedure: Given the circuit as shown, complete the table below. Show your solution on a separate sheet. R3 3 12 R3 = 252 R1=251 3y Resistor Voltage Current R1 = 50 VR1 = IR2 = R2 = 20 VR2 = IR2= R3 = 3 0 VR3 = IR3 = RT = VT = 3 V IT = C