Physics Class Monday Sub Day

Dimensional Analysis Practice

Your European hairdresser wants to cut

your hair 8.0 cm shorter. How many
inches will he be cutting off?

cm

in

2.54 cm= 1 inch

Dimensional Analysis

Answer
Your European hairdresser wants to cut

your hair 8.0 cm shorter. How many
inches will he be cutting off?

8.0 cm

1 in
2.54 cm = 3.2 in

cm in

Practice Dimensional Analysis

Taft football needs 550 cm for a 1st down.

How many yards is this?

2.54 cm= 1 inch
12 inches=1 foot
3 feet = 1 yard

Dimensional Analysis

Answer:
Taft football needs 550 cm for a 1st down.

How many yards is this?

550 cm

1 in

2.54 cm

cm

yd

1 ft
12 in

1 yd
3 ft

​=6.0 yards

Practice Dimensional Analysis

A piece of wire is 1.3 m long. How many

1.5-cm pieces can be cut from this wire?

2.54 cm= 1 inch
12 inches=1 foot
3 feet = 1 yard

Practice Dimensional Analysis

Answer:
A piece of wire is 1.3 m long. How many

1.5-cm pieces can be cut from this wire?

1.3 m

100 cm

1 m
= 86 pieces

cm

pieces

1 piece
1.5 cm

Watch this video on Scientific Notataion

New Topic: Scientific Notation

� Converting into Sci. Notation:

⬥ Move decimal until there’s 1 digit to its

left. Places moved = exponent.

⬥ Large # (>1) ⇒ positive exponent

Small # (<1) ⇒ negative exponent

⬥ Only include sig figs.

65,000 kg → 6.5 × 104 kg

I. Scientific Notation

7. 2,400,000 μg

8. 0.00256 kg

9.

7 × 10-5 km

10. 6.2 × 104 mm

Practice Problems

2.4 × 106 μg

2.56 × 10-3 kg

0.00007 km

62,000 mm