Physics Grade X

Chapter 1 exercise

By: Devilim

1Write down the SI unit of:

a. Energy

b. Time

c. Force

d. Work

e. Density

f. Gravity

g. Electric current

h. Pressure

2

Convert the following:

a. 30 mm = ………………….. mm

b. 3 TB = ………………………….. B

c. 15 m/s = ……………………km/h

d. 20 m/s2 = ………….km/h2

3

Check: homogenous or not

a. �� = ��

�+ 2���

b. � = �. ��/2�

c. � = ��. � +�

��. ��

d. � = ��� + ��ℎ

4

Find unknown unit:

a. � = ℎ. � find SI unit of h

b. � = �. ��. ��/�� find SI unit of G

c. � =�

��. �� find SI unit of k

d. � = 2��

� find SI unit of k

5

zero reading diameter reading

• From the measurement, what is the diameter of the beaker glass?

6

Zero error diameter reading

Calculate the actual diameter

7

Length = (100.0 0.2) cm

Width = (40.0 0.1) cm

Calculate:

a. Perimeter

b. Area

c. If the object has height: h = (20.0 0.1) cm; find its volume

8State the number of significant digits in each measurement

a. 30001 m

b. 4000 s

c. 20200 kg

d. 20101 km

e. 3.00 m/s

f. 0.00040 s

g. 0.02030 g

h. 5.0 km/h

9Solve the following using rules of significant figures:

a. 3.054 g + 2.1 g =

b. 20.1 m – 6.03 m =

c. 40.0 cm x 2.5 cm =

d. 100.0 m : 2.0 s =

How many significant figures?

1)2.3450

2)3.001

3)2.00

4)3

5)0.02

6)0.30000

7)400.0

8)560

9)4050

10)2

11)0.4

12)0.0000050

13)4.0

14)10000

Calculate and present result according to rules of significant figures

1)3.007 + 2.6 =

2)4.0 – 2.3450 =

3)500.0 – 1.0 =

4)40.0 + 5000.0 =

5)50.0 x 2.0 =

6)400.00 x 25 =

Find the result along with its uncertainty

1) (50.0 0.2) cm + (20 1) cm

2) (50.0 0.2) cm – (20 1) cm

3) (50.0 0.2) cm : (20 1) cm

4) (50.0 0.2) cm x (20 1) cm

Suppose your hair grows at the rate of 1/32 inch per day. Find the rate at which it grows in nanometers per second.

Since the distance between atoms in a molecule is on the order of 0.1 nm, your answer suggests how rapidly atoms are assembled in this protein synthesis.

A billionaire offers to give you $1 billion if you can count out that sum with only $1 bills. Should you accept her offer?

Assume that you can count at an average rate of one bill every second, and be sure to allow for the fact that you need about 8 hours a day for sleeping and eating.