PHY 121 Midterm Exam Questions with
Verified Correct Answers
Determine the values of a and k when 299,790,000 is written in scientific notation.
Enter a and k, separated by commas.
a, k =
2.9979,8
Determine the values of a and k when 0.51 is written in scientific notation.
Enter a and k, separated by commas.
a, k =
5.1,-1
Now consider the expression 4.0×10^3 + 4×10^2. Determine the values of a and k when
the value of this expression is written in scientific notation.
Enter a and k, separated by commas.
a, k =
4.4,3
Finally, consider the expression
(6.67×10^−11)(5.97×10^24)/((6.38×10^6)^2).
Determine the values of a and k when the value of this expression is written in scientific
notation.
Enter a and k, separated by commas.
a, k =
9.78,0
How many centimeters are in an inch?
,2.54cm/1 inch
How many centimeters are there in a length 59.2 inches ?
Express your answer in centimeters to three significant figures.
150 cm
Suppose that a particular artillery piece has a range R = 8540 yards . Find its range in
miles. Use the facts that 1 mile = 5280ft and 3ft=1yard.
Express your answer in miles to three significant figures.
R = 4.85 miles
What is the speed of a car going v=1.000mph in SI units? Notice that you will need to
change from miles to meters and from hours to seconds. You can do each conversion
separately. Use the facts that 1 mile=1609 m and 1 hour=3600s.
Express your answer in meters per second to four significant figures.
v = 0.4469 m/s
Convert the following to basic SI units:
14 in
0.36 m
Convert the following to basic SI units:
46 ft/s
Express your answer with the appropriate units.
14 m/s
, Convert the following to basic SI units:
65 mph
Express your answer with the appropriate units.
29 m/s
Convert the following to basic SI units:
20 in^2
Express your answer with the appropriate units.
1.3×10^−2 m^2
Using the approximate conversion factors listed below, convert the following SI units to
English without using your calculator.
Approximate conversion factors:
10 cm ≈ 4 in
1 m ≈ 1 yard
1 m ≈ 3 feet
1 km ≈ 0.6 mile
1 m/s ≈ 2 mph
60 cm
Express your answer in inches.
24 in
Using the approximate conversion factors listed below, convert the following SI units to
English without using your calculator.
Approximate conversion factors:
10 cm ≈ 4 in
Verified Correct Answers
Determine the values of a and k when 299,790,000 is written in scientific notation.
Enter a and k, separated by commas.
a, k =
2.9979,8
Determine the values of a and k when 0.51 is written in scientific notation.
Enter a and k, separated by commas.
a, k =
5.1,-1
Now consider the expression 4.0×10^3 + 4×10^2. Determine the values of a and k when
the value of this expression is written in scientific notation.
Enter a and k, separated by commas.
a, k =
4.4,3
Finally, consider the expression
(6.67×10^−11)(5.97×10^24)/((6.38×10^6)^2).
Determine the values of a and k when the value of this expression is written in scientific
notation.
Enter a and k, separated by commas.
a, k =
9.78,0
How many centimeters are in an inch?
,2.54cm/1 inch
How many centimeters are there in a length 59.2 inches ?
Express your answer in centimeters to three significant figures.
150 cm
Suppose that a particular artillery piece has a range R = 8540 yards . Find its range in
miles. Use the facts that 1 mile = 5280ft and 3ft=1yard.
Express your answer in miles to three significant figures.
R = 4.85 miles
What is the speed of a car going v=1.000mph in SI units? Notice that you will need to
change from miles to meters and from hours to seconds. You can do each conversion
separately. Use the facts that 1 mile=1609 m and 1 hour=3600s.
Express your answer in meters per second to four significant figures.
v = 0.4469 m/s
Convert the following to basic SI units:
14 in
0.36 m
Convert the following to basic SI units:
46 ft/s
Express your answer with the appropriate units.
14 m/s
, Convert the following to basic SI units:
65 mph
Express your answer with the appropriate units.
29 m/s
Convert the following to basic SI units:
20 in^2
Express your answer with the appropriate units.
1.3×10^−2 m^2
Using the approximate conversion factors listed below, convert the following SI units to
English without using your calculator.
Approximate conversion factors:
10 cm ≈ 4 in
1 m ≈ 1 yard
1 m ≈ 3 feet
1 km ≈ 0.6 mile
1 m/s ≈ 2 mph
60 cm
Express your answer in inches.
24 in
Using the approximate conversion factors listed below, convert the following SI units to
English without using your calculator.
Approximate conversion factors:
10 cm ≈ 4 in
