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Charging by Induction Read from Lesson 2 of the Static Electricity chapter at The Physics Classroom: http://www.physicsclassroom .com/Class/estatics/us/2C.html MOP Connection: Static Electricity: sublevels 5,6, and 7 Review: 1.Fill in the following blanks with the words eiectrons or protons. __ are negatively charged and __ are positively charged. The __ reside in the nucleus of atoms and are tightly bound; they will never leave an alom as sa result of electrostati procedures On the other hand, __ are located outside the nucleus and ate easily removed from or added to aloms. As an object begins to gain or lose __ from its atoms, it becomes positively or neg atively charged. A A positively charged object has more than negatively charged object has more __ than __ __ __ Consider the following process: An uncharged metal pop can is attached to a Styrofoam cup (which acts as an insulating stand). A negatively charged balloon is brought near the pop can. While the balloon is held near, the can 15 touched.When the can is pulled away, the pop can is charged. 2. This process is know I as __ . a. charging by conduction b. charging by induction C. polarization d. grounding 3.When the balloon is held near to the pop can (and before being touched by the hand), the distribution of charge on the pop can is best depicted by diagram __ 4. When the pop can is touched by the hand __ move from the __ to the __ a. protons, hand, can b. protons, can, hand C. electrons, hand, can d. electrons, can, hand 5.This process causes the can to acquire a __ charge. a. negative b. positive C. neutral 6.When the induction charging process is complete, the balloon is __ . a. positively charged b. electrically neutral C. still negatively charged only having fewer excess electrons as before the process began d. still negatively having the same amount of negative charge as it previously had 7.In general, the use of a negatively charged object to charge another object by induction causes th other object to acquire il __ charge. A. positive b. negative
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9.4.2 Test (CST): Computer-Scored Unit Test Questlon 4 of 25 An electromagnetic wave has a frequency of 3.7 xx10^(18)Hz and a speed of 3xx 10^(8)m//s . Use the equation for wavelength to calculate the wavelength of this wave. A. 8.11 xx10^(-11)m B. 8.31 xx10^(12)m C. 1.11 xx10^(27)m D. 4.51 xx10^(-6)m
09.3.A Questions - Conservation of momentum Name. Testing conservation of momentum 1 During a game of tennis a ball of mass 0.052kg is thrown up vertically and then hit with a tennis racquet. Its horizontal velocity immediately after the serve is 250kmh^(-1) . a What is the horizontal velocity of the ball in ms^(-1) ? 250 xx1000-:60^(2)=69.4ms^(-1) 69ms^(-1) b Calculate the horizontal momentum of the ball immediately after it is served. (1 mark) 0.052 xx69=5.0kyms^(-1) (1 mark) c The racquet and ball are in contact for 0.08s . Calculate the net force acting on the ball due to the racquet. (2 marks)
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f. State the condition for total internal reflection of light to occur g. State the law of refraction of light h. List the properties of light wave and explain any two of them with the aid of a diagram i. The critical angle for a transparent substance is 39° . Calculate the refractive index.
PHYSICS A catapult used to hold a stone of mass 500g is extended by 20cm with an applied force F . If the stone leaves with a velocity of 40ms^(-1) , the value of F is A. 4.0 xx10^(4)N C. 2.0 xx10^(3)N B. 4.0 xx10^(3)N D. 4.0 xx10^(2)N m+500,=0.5ks e=20cmquadc_(0)=0.2m v=arm-1^(-1) The frictional force is independent of the area of the surfaces in contact. The frictional force depends on the nature of the surfaces in contact. III. The frictional force depends on the speed of sliding. IV. The frictional force is directly proportional to the normal reaction. Which combination of the above is true of sliding friction? A. I, II and IV C. I, III and IV B. I, II and III D. II, III and IV The velocity v of a particle in a time t is given by the equation v=10+2t^(2) Find the instantaneous acceleration after 5 seconds. sqrtv=10+2l^(2) A. 10ms^(-1) B. 15ms^(-1) C. 20ms^(-1) D. 60ms^(-1) sqrt=+0+2xx5^(2) 4. If the force and the velocity on a system are each reduced simultaneously by half, the power of the system is A. Doubled ℓ . Reduced to a quarter B. Constant Đ. Reduced by half 5. The velocity ratio of a machine is 5 and its efficiency is 75% . What effort would be needed to lift a load of 150N with the machine? A. 50N B 40N C. 30N D. 20N