Purpose: Experiment to Discover some of water's unique properties. Materials: beaker of WATER! Bag of pennies eye droppers for each person in the group 2-Plastic Cup wax paper Plastic tray EMPTY PETRI DISH Test Tube Pennics #1 1. Question: How many pennies can be put in a jar FULL of water before water will spill over the edge? 12 2. Procedure: a. Using the beaker of water, fill a plastic cup with water as close to the top as possible. You may need to bend down so that your eyes are level with the top of the plastic cup. Use the plastic pipet to add a drop by drop until you are sure the cup is ALL the way full. b. GENTLY Add pennies one by one until water trickles over the edge. Count the pennies and repeat for a total of 3 times. c. d. After you have done it three times, repeat it once more but this time add a half a squirt of liquid soap to the water before adding the pennies. 3. Data: __ number of pennies in plastic cup __ number of pennies in plastic cup with soap uestions at the end of this lab ennies #2 Question: How many drops of water will fit on the head of a penny? 2.Procedure: a. Make sure the water you are about to use is not soapy AT ALL! b. Be sure each person's penny is dry. b.Using a, plastic pipet each person in the group will count the number of drops of water that will fit on the head own penny before spilling off. Don't bump the table! 3. Data: record each persons number: __ Question: What will soap do to pepper floating on the surface of water? Procedure: ocedu MAKE SURE ALL SOAP IS WASHED OUT FIRST!Put some water in the petri dish. (The amount doe b. Sprinkle a pinch of pepper on top of the water. b.Put a small amount of soap on the tip of your finger and touch the surface of the water. Data: Record your observations below. per and Soap

Answer ALL questions. Write your answers in the spaces provided. Some questions must be answered with a cross in a box 凶 . If you change your mind about an answer, put a line through the box and then mark your new answer with a cross ⊠ . 1 (a) State three differences between radio waves and sound waves. (3) 1 2 3

The diagram shows a prism placed on a horizontal floor. The prism has height 5m The volume of the prism is 30m^(3) The pressure on the floor due to the prism is 55 newtons //m^(2) Work out the force exerted by the prism on the floor.

What is 703g in kilograms? Previous Watch video Answer

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)

A piece of cheese has a mass of 232g and a density of 1.6g//cm^(3) . Calculate the volume of the cheese.

A satellite travelled at a speed of 7473 metres per second for 2872 seconds. Use a calculator and the formula below to calculate the distance that the satellite travelled during this time. Give your answer in metres (m) to 3 s.f.

A watering can holds 0.00031m^(3) of water. What is this volume in mm^(3) ?

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