## Newton’s first law of motion – problems and solutions

1. A person is in an elevator that moving upward at a constant velocity. The weight of the person is 800 N. Immediately the elevator rope is broke, so the elevator falls. Determine the normal force acted by elevator’s floor to the person just before and after the elevator’s rope broke.

A. 800 N and 0

B. 800 N and 800 N

C. 1600 N and 0

D. 1600 N and 800 N

## The International system of units Unit Prefixes – Problems and Solutions

6 The International System of Units Unit Prefixes – Problems and Solutions

The International System of Units

1. Which of the following units is not a unit of length

A. Mil

B. Foot

C. Inch

D. Knot

## Conversion of units – problems and solutions

Problems and solutions about Conversion of units – problems and solutions

1. Half a liter of fresh milk mixed with pudding sauce, then what is the volume of milk to be put in pudding sauce…

A. 5000 ml

B. 500 cc

C. 50 dm3

D. 5 m3

## Measurement and significant figures – problems and solutions

Measurement and significant figures – problems and solutions

1. The length of an object measured using a micrometer is 15.08 mm. Determine the significant figures and the number of significant figures.

A. 15.08 mm and three significant figures

B. 1.508 mm and four significant figures

C. 15.08 mm and four significant figures

D. 1.508 mm and three significant figures

## Dimensional analysis – problems and solutions

Dimensional analysis – problems and solutions

1. Based on the dimensional analysis, determine the following physics dimensions that have the same dimensions.

A. work and power

B. power and pressure

C. force and momentum

D. work and heat

## Dimensional analysis – problems and solutions

Dimensional analysis – problems and solutions

1. Based on the dimensional analysis, determine the following physics dimensions that have the same dimensions.

A. work and power

B. power and pressure

C. force and momentum

D. work and heat

## Magnetic field produced by two parallel current-carrying wires – problems and solutions

1. Two long parallel wires carrying the same currents, 3-A. If the distance between both wires is 40 cm, determine the magnetic field at point P. μo = 4π x 10−7 Wb A−1 m−1.

Known :

Electric current (I) = 3-A

Distance between wire 1 and 2 (r12) = 40 cm = 0.4 m

Distance between wire 1 and P (r1P) = 30 cm = 0.3 m

Distance between wire 2 and P (r2P) = 40 – 30 = 10 cm = 0.1 m