اذا كان المتجه A= -i +3j+2k and B-21-4j+2k. 1-A+B 2-A-B 3-A.B 4-AxB
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- 9. If an object is released from the position A on the top of the hill. What will be its speed at the peak C. Assume the track is frictionless. AA h,- 50 m = 30 m B1. Which order of magnitude does the SI prefix “mega-“ (M) represent? A. 103 B. 106 C. 109 D. 1012 2. 2.34 kW is equal to A. 2 340 W. B. 23 400 W. C. 234 000 W. D. 2 340 000 W. 3. How many seconds (s) are there in 1 hour 20 minutes? A. 80 s B. 380 s C. 4800 s D. 87 600 s 4. It takes a kettle 5 minutes to transfer 540 kJ of energy to boil some water. What is the power of the kettle? A. 1080 W B. 1800 W C. 9000 W D. 108 000 W 5. A heater of power 1200 W is switched on for an hour and a half. How much heat is given out from the heater? A. 2.16 kJ B. 6.48 kJ C. 2.16 MJ D. 6.48 MJ 6. An immersion heater has a power of 1500 W. How long does it take to supply 3 000 000 J of heat? A. 2 minutes B. 5 minutes C. 20 minutes D. 33 minutes 7. An immersion heater is connected to power supply via a joulemeter. The figure below shows the variation of the reading of the joulemeter with time. Estimate the power of the immersion heater. A. 582 W B. 723…2- if à = 3i – j - 4k, B = -2i + 4j – 3k, Č = i + 2j – k, D = ai – 3j – 3k find : (a) 2à – B + 30 (b) JÄ + B + č| (c) Ả × B (d) B · Č (e) Ả · B × ở (f) Ả × (B x č) (8) (Ả x B) × ở %3D | (h) angle between Å · C (i) value of 1 that makes the vectors D· C orthogonal. (i) The area of a parallelogram that B · C are Two adjacent sides on it. (k) value of 1 that makes the vectors D· A orthogonal. (h) the component of A in direction of B.