## Converging lens – problems and solutions

1. A 5-cm high object is placed 5 cm from a 15-cm focal length converging lens. Determine the image distance, the magnification of the image, the image height and the properties of the image. Known : The focal length...

## Diverging lens – problems and solutions

1. A 5-cm high object is placed 15 cm from a 30-cm focal length diverging lens. Determine the image distance, the magnification of the image, the image height, and properties of the image. Known : The focal length (f)...

## Convex mirror – problems and solutions

1. The focal length of a convex mirror is 10 cm and the object distance is 20 cm. Determine (a) the image distance (b) the magnification of image Known : The focal length (f) = -10 cm The minus...

## Concave mirror – problems and solutions

1. An object is placed 10 cm from a concave mirror. The focal length is 5 cm. Determine (a) The image distance (b) the magnification of image Known : The focal length (f) = 5 cm The object distance...

## Energy conservation for heat transfer – problems and solutions

1. 1-kg water at 100oC mixed with 1-kg water at 10oC in an isolated system. The specific heat of water is 4200 J/kg oC. Determine the final temperature of the mixture! Known : Mass of hot water (m1) =...

## Latent heat, heat of fusion, heat of vaporization – problems and solutions

1. Calculate the amount of heat added to 1 gram gold to change phase from solid to liquid. The heat of fusion for gold is 64.5 x 103 J/kg. Known : Mass (m) = 1 gram = 1 x...

## Specific heat and heat capacity – problems and solutions

1. A body with mass 2 kg absorbs heat 100 calories when its temperature raises from 20oC to 70oC. What is the specific heat of the body? Known : Mass (m) = 2 kg = 2000 gr Heat (Q)...

## Mechanical equivalent of heat – problems and solutions

1. 2 kcal (kilocalorie) = ….. calorie ? Solution 1 kcal = 1000 calorie 2 kcal = 2 (1000 calorie) = 2000 calorie 2. 4 Calorie = ….. calorie ? Solution 1 Calorie (a Capital C) = 1 kcal...

## Heat, mass, specific heat, the change in temperature – problems and solutions

1. A 2 kg lead is heated from 50oC to 100oC. The specific heat of lead is 130 J.kg-1 oC-1. How much heat is absorbed by the lead? Known : Mass (m) = 2 kg The specific heat (c)...

## Volume expansion – problems and solutions

1. At 30 oC the volume of an aluminum sphere is 30 cm3. The coefficient of linear expansion is 24 x 10-6 oC-1. If the final volume is 30.5 cm3, what is the final temperature of the aluminum sphere?...