Gurumuda Networks
Electric circuits with resistors in parallel and internal resistance – problems and solutions
1. Based on the figure below, if the source of electromotive force (emf) is 24 Volt, determine electric current I.
Known :
Source of emf = 24 Volt
Internal resistance (r) = 2 Ohm
Resistor 40 Ohm, 20 Ohm, and 20 Ohm.
Calculation of the electrical energy usage by electrical tool – problems and solutions
1. In a house, there are 5 lamps 25 Watt used 14 hours per day, a 200 Watt refrigerator used 24 hours per day, and a 125 Watt water pump used 8 hours per day. How much electrical energy used for a month (30 days)?
Known :
Power of lamp = 5(25) = 125 Watt and time of use = 14 hours x 30 = 420 hours
Power of refrigerator = 200 Watt and time of use = 24 hours x 30 = 720 hours
Power of water pump = 125 Watt and time of use = 8 hours x 30 = 240 hours
Types of electric charges – problems and solutions
1. Based on the figure of the electric charges below.
Objects A and D are negatively charged (-), object A attract object B and repels object C, object D repels E. Determine type of electric charge of object B, C, and E.
A. Positive, Positive, Negative
B. Negative, Negative, Positive
C. Positive, Negative, Negative
D. Positive, Negative, Positive
6 Simple machine (Inclined plane Lever) – Problems and Solutions
1.
Which inclined plane have the same mechanical advantage
Nearsighted and farsighted – problems and solutions
1. A child with nearsighted can read a book at a near point 1 meter. In order to read at a normal reading distance of 25 cm, determine the power of the lens must use by the child.
Solution :
The child suffers farsighted, where the near point of his eyes is 1 meter or 100 cm. The near point of the normal eye is 25 cm. The eye can normalize by a convex lens.
Kinetic energy – problems and solutions
1. Two cars have the same mass, moving with different kinetic energy. The kinetic energy of the first car is 9 times the second car’s kinetic energy. The first car speed comparison with the second car is …..
Known :
Mass of car A (mA) = m
Mass of car B (mB) = m
The kinetic energy of car B (KEB) = KE
The kinetic energy of car A (KEA) = 9 KE
Speed of transverse wave – problems and solutions
1.
If the time interval required to travel from A to B is 2 seconds, determine the speed of the transverse wave.
Known :
Distance A-B = 6 meters
Time interval A-B = 2 seconds
Wanted: Speed of transverse wave
Radioactivity – problems and solutions
1. Based on the figure below, radioactive activity after decay for 13.86 hours is …
Known :
Half-life (T1/2) = 6.93 hours
Time-lapse (t) = 13.86 hours
Wanted: radioactive activity
Micrometer screw – problems and solutions
1. The measurement of the diameter of the wire with a micrometer is 2.48 mm. The image corresponding to the measurement result is…
Solution :
