Gurumuda Networks
Optical instruments – problems and solutions Concave mirror 1. An h-high object is placed at a distance that smaller than focal length f. Determine the properties of the image. Solution According to the figure above, properties of the image are virtual, upright and greater than an object. 2. If an object is placed at the … Read more
Step-up and step-down transformer – problems and solutions 1. A transformer has a primary coil and a secondary coil with the number of loops are 500 and 5000. Input voltage is 220 V. What is the output voltage? Known : Primary coil (NP) = 500 loops Secondary coil (Ns) = 5000 loops Primary voltage (VP) … Read more
Pressure of solids – problems and solutions 1. Mass and volume of four blocks below are same. Which is the smaller pressure exerted by block on the floor? Solution P = F / A Based on this formula it is concluded that pressure (P) is directly proportional to force (F) and inversely proportional to surface … Read more
Resistors circuits – problems and solutions 1. Which one of the resistors circuits, as shown in the figure below, has bigger resistance. Answer A R1 = 2 Ω, R2 = 2 Ω, R3 = 6 Ω, R4 = 6 Ω R3 and R4 are connected in parallel. The equivalent resistor : 1/R34 = 1/R3 + … Read more
Electric circuits – problems and solutions 1. R1, = 6 Ω, R2 = R3 = 2 Ω, and voltage = 14 volt, determine the electric current in circuit as shown in figure below. Known : Resistor 1 (R1) = 6 Ω Resistor 2 (R2) = 2 Ω Resistor 3 (R3) = 2 Ω Voltage (V) … Read more
Heat and change of phase – problems and solutions 1. Based on the graph, what is the heat absorbed by 5-kg water during process C-D ? Specific heat of water = 4,200 J/kg oC. Known : Mass (m) = 5 kg Specific heat of water (c) = 4200 J/kg oC Initial temperature (T1) = 0 … Read more
Linear Momentum Impulse Collisions 1. Linear Momentum 1.1 Linear Momentum Definition The linear momentum of an object is defined as the result of multiplying the mass of the object by the velocity of the object. p = m v where: p = momentum, m = mass (kg), v = velocity (m/s) Linear momentum, or simply … Read more
Density – problems and solutions 1. The volume of an object is 8 cm3 and mass of an object is 84 gram. What is the density of the object? Known : Volume (V) = 8 cm3 Mass (m) = 84 gram Wanted : density (ρ) Solution : ρ = m / V = 84 gram … Read more
Pascals principle – problems and solutions 1. Known : The area of A1 = 10 cm2 The area of A2 = 100 cm2 Force 2 (F2) = 100 Newton Wanted : Force 1 (F1) Solution : P = F / A P = pressure, F = force, A = area P1 = F1 / A1 … Read more
Ohm’s law – problems and solutions 1. Based on the table below, the relation between voltage (V), electric current (I) and resistance (R) is….. Solution : Ohm’s law : V = I R or R = V / I R1 = V / I = 1.50 / 0.08 = 18.75 Ohm R2 = V / … Read more