NIGER STATE COLLEGE OF AGRICULTURE, MOKW A PRE-ND SCIENCES DEPARTMENT FIRST SEMESTER EXAMINATION 2022/2023 SESSION COURSE CODE: CBPO11 COURSE TITLE : MECHANICS, HEAT, AND PROPERTIES OF MATER TIME: 3 HRS DATE: Monday, 07-08-2023 EXAMINER: AHMAD ABUBAKAR SOJE Instruction: answer any Five Questions __ 1. (a) Define the terms fundamental and derived quantities (b) Mentions four (4 each fundamental and derived quantities with their units (c) List four (4)each examples of scalar and vector quantities __ 2. (a) Explain terms uniform velocity acceleration and deceleration (b) A body moves from rest with an acceleration of 3ms^-2 to covered a distance of 70 m. Calculate its velocity. (c) An object thrown vertically upward from ground level to a height of 90m. How long does it take to reach the height? (Assumeg=10ms^-2) 3. (a) State the following Laws (i) Second Newton's law of motion (ii) Law of conservation of linear momentum (b) A ball of mass 0.7 Kg, travelling with a velocity of 125ms^-1 collides with another ball of mass 1.2 Kg moving with 85ms^-1 in the same direction . If they stick together after the impact, calculate their common velocity. (c) Define impulse of a force? A force of 50 N acts for 25s, calculate the change in momentum 4. (a) Explain the term moment of a force and State principles of moment (b) A uniform metre rule is found to balance horizontally at the 48cm mark. When a body of mass 60g is suspended at the 5cm mark , the balance point is found to be the 30cm mark. Calculate the mass of the metre rule.

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