{"id":3152,"date":"2018-06-22T15:24:12","date_gmt":"2018-06-22T22:24:12","guid":{"rendered":"https:\/\/gurumuda.net\/physics\/?p=3152"},"modified":"2018-06-22T15:24:12","modified_gmt":"2018-06-22T22:24:12","slug":"quantities-and-units-of-physics-problems-and-solutions","status":"publish","type":"post","link":"https:\/\/gurumuda.net\/physics\/quantities-and-units-of-physics-problems-and-solutions.htm","title":{"rendered":"Quantities and units of physics \u2013 problems and solutions","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

1.<\/span><\/span><\/p>\n

\"Quantities<\/p>\n

The correct International Unit showed by student\u2026<\/span><\/span><\/p>\n

A. R and S<\/span><\/span><\/p>\n

B. P and R<\/span><\/span><\/p>\n

C. P and Q<\/span><\/span><\/p>\n

D. Q and S<\/span><\/span><\/p>\n

Solution<\/span><\/span><\/p>\n

Student P : <\/u><\/span><\/span><\/p>\n

The international unit of length is meter (m), not centimeter (cm)<\/span><\/span><\/p>\n

The measuring instrument of length is the ruler.<\/span><\/span><\/p>\n

Student Q :<\/u><\/span><\/span><\/p>\n

The international unit of electric current is Ampere (A)<\/span><\/span><\/p>\n

The measuring instrument of electric current is an Ampere meter.<\/span><\/span><\/p>\n

Student R :<\/u><\/span><\/span><\/p>\n

The international unit of temperature is Kelvin (K)<\/span><\/span><\/p>\n

The measuring instrument of temperature is a thermometer, not a hydrometer. <\/span><\/span><\/p>\n

A hydrometer is an instrument used for measuring the density of liquids based on the concept of buoyancy.<\/span><\/span><\/p>\n

Student S :<\/u><\/span><\/span><\/p>\n

The international unit (SI) of mass is kilogram (Kg)<\/span><\/span><\/p>\n

The measuring instrument of mass is a balance scale
\n<\/span><\/span><\/p>\n

The correct data and based on the SI unit (International Unit) shown by student Q and S.<\/span><\/span><\/p>\n

The correct answer is D. <\/span><\/span><\/p>\n

2. Find the correct relation between quantity and unit.<\/span><\/span><\/p>\n

\"Quantities<\/p>\n

Solution<\/span><\/span><\/p>\n

Force = Mass x Acceleration<\/a><\/span><\/span><\/p>\n

The international unit of mass is kilogram (kg)<\/span><\/span><\/p>\n

The international unit of acceleration is meter per second squared (m\/s<\/span><\/span>2<\/span><\/span><\/sup>) <\/span><\/span><\/p>\n

Unit of force = kg m\/s<\/span><\/span>2 <\/span><\/span><\/sup>= kg m s<\/span><\/span>-2<\/span><\/span><\/sup><\/p>\n

Pressure<\/a> = force \/ area<\/span><\/span><\/p>\n

International unit of force is kg m\/s<\/span><\/span>2<\/span><\/span><\/sup><\/p>\n

The international unit of area is m<\/span><\/span>2<\/span><\/span><\/sup><\/p>\n

Unit of pressure = kg \/m s<\/span><\/span>2 <\/span><\/span><\/sup>= kg m<\/span><\/span>-1<\/span><\/span><\/sup> s<\/span><\/span>-2<\/span><\/span><\/sup><\/p>\n

Energy = Work<\/span><\/span><\/p>\n

Work = force x displacement<\/a><\/span><\/span><\/p>\n

International unit of force is kilogram meter per second squared (kg m\/s<\/span><\/span>2<\/span><\/span><\/sup>) <\/span><\/span><\/p>\n

The international unit of displacement is meter (m)<\/span><\/span><\/p>\n

Unit of energy = unit of work= kg m<\/span><\/span>2<\/span><\/span><\/sup>\/s<\/span><\/span>2<\/span><\/span><\/sup> = kg m<\/span><\/span>2<\/span><\/span><\/sup> s<\/span><\/span>-2<\/span><\/span><\/sup><\/p>\n

Power = Work \/ time<\/span><\/span><\/p>\n

International unit of work is kilogram meter squared per second squared (kg m<\/span><\/span>2<\/span><\/span><\/sup>\/s<\/span><\/span>2<\/span><\/span><\/sup>) <\/span><\/span><\/p>\n

The international unit of time is second (s)<\/span><\/span><\/p>\n

Unit of power is kg m<\/span><\/span>2<\/span><\/span><\/sup>\/s<\/span><\/span>3<\/span><\/span><\/sup> = kg m<\/span><\/span>2<\/span><\/span><\/sup> s<\/span><\/span>-3<\/span><\/span><\/sup><\/p>\n

The correct answer is D. <\/span><\/span><\/p>\n

3.<\/span><\/span><\/p>\n

\"Quantities<\/p>\n

Based on the above table, find A, B, C, D, and E.<\/span><\/span><\/p>\n

A. Volume, kilogram, temperature, area, meter<\/span><\/span><\/p>\n

B. Length, kilogram, time, area, Newton<\/span><\/span><\/p>\n

C. Length, kilogram, volume, area, Joule<\/span><\/span><\/p>\n

D. Length, Newton, time, volume, meter<\/span><\/span><\/p>\n

Solution :<\/span><\/span><\/p>\n

A = Length<\/span><\/span><\/p>\n

B = Kilogram<\/span><\/span><\/p>\n

C = Time<\/span><\/span><\/p>\n

D = Area<\/span><\/span><\/p>\n

E = Kg m\/s<\/span><\/span>2 <\/span><\/span><\/sup>= Newton <\/span><\/span><\/p>\n

The correct answer is B.<\/span><\/span><\/p>\n

4. Determine the <\/span><\/span><\/span>pair of basic quantities and units in the International System.<\/span><\/span><\/span><\/span><\/p>\n

A. Length\u2013 meter, mass \u2013 kg and electric charge\u2014coulomb<\/span><\/span><\/span><\/p>\n

B. Time \u2013 second, temperature \u2013 Kelvin, luminous intensity\u2014Candela<\/span><\/span><\/span><\/p>\n

C. Second \u2013 time, meter \u2013 length, kg\u2014mass<\/span><\/span><\/span><\/p>\n

D. mass \u2013 kg, time\u2013 second, Kelvin \u2013 temperature<\/span><\/span><\/span><\/p>\n

Solution<\/span><\/span><\/span><\/p>\n

Basic quantities and International unit (SI) :<\/span><\/span><\/p>\n

Length \u2013 meter (m)<\/span><\/span><\/p>\n

Mass \u2013 kilogram (kg)<\/span><\/span><\/p>\n

Time \u2013 second (s)<\/span><\/span><\/p>\n

Temperature \u2013 Kelvin (K)<\/span><\/span><\/p>\n

Luminous intensity\u2014Candela<\/span><\/span><\/p>\n

The correct answer is B. <\/span><\/span><\/p>\n

5.<\/span><\/span><\/p>\n

\"Quantities<\/p>\n

The correct quantities and units based on the International System of Units (SI) shown by number\u2026<\/span><\/span><\/p>\n

A. 1 and 3<\/span><\/span><\/p>\n

B. 1 and 4<\/span><\/span><\/p>\n

C. 1, 2, and 3<\/span><\/span><\/p>\n

D. 1, 3, and 4<\/span><\/span><\/p>\n

Solution<\/span><\/span><\/p>\n

Quantities and units of the International System (SI) :<\/span><\/span><\/p>\n

(1) Temperature \u2013 Kelvin<\/span><\/span><\/p>\n

(2) Mass \u2013 Kilogram<\/span><\/span><\/p>\n

(3) Time \u2013 Second<\/span><\/span><\/p>\n

(4) Length \u2013 Meter<\/span><\/span><\/p>\n

The correct answer is D. <\/span><\/span><\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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