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Questions in physics

📝 Answered - Which set of numbers gives the correct possible values of \(l\) for \(n=3\)? A. \(0,1,2\) B. \(0,1,2,3\) C. \(-2,-1,0,1,2\) D. \(-3,-2,-1,0,1,2,3\)

📝 Answered - If you are traveling at 60 mph, what is the total distance you will travel between perceiving a need to brake and coming to a complete stop? A. 40 feet B. 118 feet C. 240 feet

📝 Answered - Why do stars twinkle? Choose one: A. The stellar surface where the light is emitted is very turbulent. B. Our eyes are constantly moving. C. Stars are constantly changing their brightness. D. The distribution of absorption lines in their atmospheres is changing. E. The motion of Earth's atmosphere creates the appearance of twinkling.

📝 Answered - Calculate the potential energy of a pawpaw fruit with a mass of 5g hanging at a height of 1200cm. Take the acceleration due to gravity as 9.8 N/kg.

📝 Answered - An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

📝 Answered - An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

📝 Answered - GRADE 12 PHYSICS ASSESSMENT 2 PART B: EXTENDED RESPONSE QUESTIONS ASSESSMENT BOOKLET (20 MARKS) Explain your answers in detail and in complete sentences. Where mathematical calculations are necessary, include all calculation steps in your answer(s). These will assist the tutor/marker in evaluating your complete solution. Write your answers in the space provided next to the questions. QUESTION 1 (5 marks) A liquid X at 25°C is poured to a height of 40cm in a thin capillary tube of length 70cm and diameter of 1cm. Assume that the volume of the capillary tube does not change with temperature. a) Find the initial volume of the liquid in cm³. b) The temperature of the liquid is reduced by 10°C causing the liquid to reduce in height to 37cm. Find the volume coefficient of thermal expansion (B) of this liquid. c) At the initial height of 40cm and temperature of 25°C, what change in temperature (ΔT) is needed for the liquid to rise to a height of 49cm?

📝 Answered - An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

📝 Answered - If molecules are moving around quickly, the object has more A. density B. weight C. thermal energy D. light energy

📝 Answered - What conversion takes place in a generator? A. An electric current into a magnetic field B. Electric energy into mechanical energy C. A lower voltage into a higher voltage D. Mechanical energy into electric energy