Physics, Foundation Programme – Problem Solving Exercises 8
SI Units
1. Which of the following units are NOT base (fundamental) units:
cd cm J m N second A hour K mol gram
x x x x x
kg V Ω T
x x x
2. How many megahertz (MHz) is 750 kilohertz(kHz)?
A: 750 kHz = 0.750 MHz
3. Convert 5021 centimeters to kilometers.
A: 5021 cm = 0.05021 km
4. How many seconds are in a leap year?
A: 366 day * 24 hour/day * 60 min/hour * 60 s/min = 31,622,400 s
5. Convert the speed 5.30 m/s to km/h.
A: 19.08 km/h
6. The liquid measure milliliter, mL, is the same as 1 cm3
. How many milliliters of liquid can be held in a 2.5-
m3
container?
A: 2.5 m3
= 2.5·106
ml = 2,500,000 ml
7. Use an appropriate prefix of units so that the amount of units is a number larger than or equal to 1 and
smaller than 1000 :
a. a:
FP Physics - Problem Solving Exercises 8WA 1/3 Masaryk University
b. a:
c. a:
d. a:
e. a:
8. The micrometer (1 μm) is often called the micron. (a) How many microns make up 1.0 km? (b) What
fraction of a centimeter equals 1.0 μm? (c) How many microns are in 1.0 yd? (use 1.094 yd = 1 m)
a: a) , b) c)
9. In the following exercise we will abbreviate liter as L, which is common in chemistry (in physics you will
usually use l for liters). The volume of 1L is equal to 1.0 dm3
SI units.
a. Convert 1L to m3
a:
b. Convert 50 mL to to cm3
.
a:
c. Convert 25 μL to m3
a:
FP Physics - Problem Solving Exercises 8WA 2/3 Masaryk University
10. If F is a constant force, exerted in the direction in which the object is moving, then work,W, is the product
of the force and the object’s displacement d. (W=F·d). Express the unit of work (joule) using the base units.
A:
FP Physics - Problem Solving Exercises 8WA 3/3 Masaryk University