Wednesday 8th May, 2019
Physics 2 (Essay) – 09:30 a.m. – 11.00 a.m.
Physics 1 (Objective) – 11:00 a.m. – 12:15 p.m.
PHYSICS OBJ:
1-10: CBBB-ACBCB
11-20:BCCCABBCBB
21-30: C-DADCD-DA
31-40: BDDBBCAABC
41-50: ABDABDBCBA
(1)
Mass = 20g = (20/100)kg = 0.02kg
Extension = 5cm = (5/100)m = 0.05m
K = 200N/
V = ?
1/2mv² = 1/2ke²
V = √ke²/m = √200×0.05×0.05/0.02
V = √25
V = 5m/s
8ai) Terminal Velocity: this is the constant speed that a
freely falling object eventually reaches when the
resistance of the medium through which it is falling
prevents further acceleration.
(9b)
(i) Clay is proper conductor of heat than plastic
(ii) An in pressure in the cooker increases the ambient
temperature in the cooker, hence the food cooks faster
(9c)
Change in the state of a substance
Increase in temperature
9ai)
Latent heat , energy absorbed or released by a substance
during a change in its physical state (phase) that occurs
without changing its temperature . The latent heat
associated with melting a solid or freezing a liquid is
called the heat of fusion ; that associated with vaporizing
a liquid or a solid or condensing a vapour is called the
heat of vaporization . The latent heat is normally
expressed as the amount of heat (in units of joules or
calories ) per mole or unit mass of the substance
undergoing a change of state.
No 10a
Atomic spactra is the spectra of frequencies of
electromagnetic radiation emitted or absorbed during
transitions of electrons between energy levels within an
atom.
11a)t when particles are 30 meters apart
S= ut + ½ at2
Sp= st + ½ t2
Sa = 6t + 1/2 (3)t2
Where sp and sa are distances covered by particles
respectively at any time t
At time, t= 1.5s
Sp = 5(1.5) + ½(1.5)2 =8.625m
sa = 6(1.5) + ½ (3)(1.5)2 = 12.375m
sp + sa = 8.625 + 12.375
= 21m
Distance between particles = 51 – 21 = 30m
At time t = 1.5s, the particles will be 30 meters apart.
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