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A tug-of-war team practises by tying a rope to a tree. The team pulls with a force of 1200N The tree does not move. What is the force of the tree on the rope? Select one: less than 1200N zero 1200N more than 1200N
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MoreAnswer 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
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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
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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