question

Write the following numbers in scientific notation.
a) 1061
b) 0.00081

answer

a) 1.061 x 10^3
b) 8.1 x 10^-4

question

Write the following numbers in standard orientation, maintaining the same number of significant figures.
a) 6.104 x 10^2
b) 9.5 x 10^-3

answer

a) 610.4
b) .0095

question

Arrange these values according to magnitude.
7.5 x 10^-6
3.6 x 10^-2
2.4 x 10^5
9.0 x 10^-6
6.1 x 10^4

answer

Greatest to Least
2.4 x 10^5
6.1 x 10^4
3.6 x 10^-2
9.0 x 10^-6
7.5 x 10^-6

question

Identify the power of ten that defines each of these prefixes.
nano-
kilo-
centi-
micro-
milli-
mega-

answer

nano- 10^-9
kilo- 10^3
centi- 10^-2
micro- 10^-6
milli- 10^-3
mega- 1-^6

question

Classify each phrase about weight and mass as true or false.
mass and weight are the same thing
mass and weight both depend on gravity
your mass on the moon is the same as your mass on the Earth
your weight on the moon is the same as your weight on the Earth

answer

True:
your mass on the moon is the same as your mass on the Earth
False:
mass and weight are the same thing
your weight on the moon is the same as your weight on the Earth
mass and weight both depend on gravity

question

Several groups of students are attempting to determine the density of a lead weight by various methods. Their data is shown here.
Gr1 Gr2 Gr3
Measured Trial 1 11.5 11.5 10.9
Densities Trial 2 11.3 11.4 11.3
(g/mol) Trial 3 11.1 11.4 11.1
Av. Density 11.3 11.4 11.1
The density of lead is listed as 11.3 g/mol
Which group was more accurate?
Which group was most precise?

answer

most accurate: Group 1
most precise: Group 2

question

Identify the number of significant figures in each of these values
702.50
80.30
0.020
11020
0.006
2000
67000

answer

1 sig fig: 2000, 0.006
2 sig figs: 6700, 0.020
3 sig figs: none
4 sig figs: 80.30, 11020
5 sig figs: 702.50

question

Round each number to three significant figures.
a) 0.036549
b) 1044.987
c) 4.0007

answer

a) .0365
b) .1040
c) 4.00

question

To what decimal place should each answer be rounded? How many significant figures does the rounded answer have?
a) 9cm + 2.8cm = 11.8 cm
b) 0.135atm + 0.6atm = 0.735atm

answer

After rounding the number should be reported to the
a) ones place
b) tenths place
and thus has:
a) 2 significant figures
b) 1 significant figure

question

0.00245m = ? pm

answer

2450000000

question

Convert 8.32 um to inches.

answer

.000328 in

question

Your computer monitor has a width of 13.97 inches and a height of 10.48 inches. What is the area of the monitor display in square meters?
How many significant figures should there be in your answer?

answer

Area=.0945 m^2
4 significant figures

question

The surface temperature on Venus may approach 747 K. What is this temperature in degrees Celsius?
The temperature on Mercury may drop to -271 degrees Fahrenheit at night. What is this temperature in degrees Celsius?

answer

473.85 degrees Celsius
-168.333 degrees Celsius

question

Use volume displacement to determine the volume of this metal sample to the nearest 0.1mL.
The metal sample has a mass of 56.5g. What is the density of this metal?

answer

9.9mL

question

If a bullet travels at 965.0 m/s, what is its speed in miles per hour?

answer

2154.17 mi/h

question

Identify the principal type of energy (kinetic or potential) exhibited by each of the following.
A car parked on a hill.
A car traveling at 60mph.
Chemical energy.
A falling rock.
Compressed air in a tank.

answer

A car parked on a hill.
potential
A car traveling at 60mph.
kinetic
Chemical energy.
potential
A falling rock.
kinetic
Compressed air in a tank.
potential