Physics 1 (Introduction to Mechanics) Exam Paper - BAZE University 2021 PDF

BAZE UNIVERSITY ABUJA DEPARTMENT OF PHYSICS FACULTY OF COMPUTING AND APPLIED SCIENCES LEVEL 1 TRIMESTER 21A, 2021 PHYSICS 1 (INTRODUCTION TO MECHANICS) (PHY101)...

BAZE UNIVERSITY ABUJA DEPARTMENT OF PHYSICS FACULTY OF COMPUTING AND APPLIED SCIENCES LEVEL 1 TRIMESTER 21A, 2021 PHYSICS 1 (INTRODUCTION TO MECHANICS) (PHY101) EXAMINATION PAPER Time Allowed: 3 Hours Answer all questions in section A and any THREE (3) questions in section B Instruction: Write the answers on clean A4 paper, scan it, merge the pages into a single file, convert it into a pdf format and then upload into google class room. Make sure you turn it in. Continue overleaf … SECTION A QUESTION 1 a) A ball is falling freely under the action of gravity, when its downward speed is 8.0m/s, it explodes into two equal parts. One part goes straight up to a height of 12m above the explosion point. What is the velocity of the other part just after the explosion. Take 𝑔 = 9.8𝑚𝑠 −2 b) Explain thermal equilibrium  c) A 50𝑔 𝑎𝑟𝑟𝑜𝑤 moving at 20𝑚𝑠 −1 strikes a pumpkin and drills at 35m hole straight through it. When it emerges, the arrow has a speed of 8. 𝑜𝑚𝑠 −1.. Assuming uniform deceleration, find (i) the time it takes the arrow to pass through the pumpkin.(ii)find the average force opposes the motion. d) A pump is needed to lift water through a height of 2.5m at rate of 500g/min. What must be minimum horse power of the pump? (use𝑔 =9.8𝑚 𝑠−2 and 1h.p = 746W (use𝑔 =9.8𝑚 𝑠−2 and 1h.p = 746W) e) State four differences between heat and temperature SECTION B QUESTION 2 a. Define friction b. A 3.0𝑔 lead bullet at 30℃ is at the speed of 240𝑚𝑠 −1 𝑖𝑛𝑡𝑜 𝑎 𝑙𝑎𝑟𝑔𝑒 𝑏𝑙𝑜𝑐𝑘 𝑜𝑓 𝑖𝑐𝑒 at 0℃ in which it embeds itself. What quantity of ice melts? Given the latent heat of fusion of ice as 3.33 × 105 𝐽/𝑘𝑔 and specific heat capacity is128𝐽𝑘𝑔−1 𝑘 −1 QUESTION 3 a. State the law of conservation of linear momentum b. A student is able to see printing in a book clearly when the book is 40cm away, but not when it is closer. Determine the focal length suitable for the correction of the defect. QUESTION 4 a. Explain the following mode of heat transfer (i) conduction (ii) convection (iii) Radiation b. A bridge is made of 518m long steel of linear expansion coefficient 11 × 10−6 𝑐 −1.How much will its length change between 250 𝑐 and 350 𝑐 c. The nucleus of an atom has a mass of 3.80 × 10−25 𝑘𝑔 and is at rest. The is nucleus is radioactive and suddenly ejects a particle of mass6.6 × 10−27 𝑘𝑔 with a speed 1.50 × 107 𝑚𝑠 −1. Find the recoil speed of the nucleus that is left behind. QUESTION 5 a. Three vectors are given as 𝐴⃗=3𝑖̂ +3𝑗̂ -2𝑘̂, 𝐵 ⃗⃗ =-𝑖̂ -4𝑗̂ +2𝑘̂, 𝐶⃗ =2𝑖̂ +2𝑗̂ +𝑘̂ Evaluate: I 𝐴⃗. (𝐵 ⃗⃗⃗⃗⃗ ⃗⃗ ×𝐶) ii 𝐴⃗. (𝐵 ⃗⃗+𝐶⃗) ii𝐴⃗×(𝐵 ⃗⃗×𝐶⃗) b. ii) Explain the difference between vector and scalar quantities. END OF QUESTION PAPER