PHY 265 EXAM 1 QUESTIONS AND ANSWERS
What is the Physics Primer?
a. A tutorial of the most important physics concepts covered in introductory physics courses.
b. A detailed explanation of all of the mathematics you will use in your introcuctory physics course.
c. A list of the most important formulas used in introductory physics courses.
d. A set of mathematics topics that are relevant to introductory physics courses. - CORRECT
ANSWER✅✅✅d. A set of mathematics topics that are relevant to introductory physics courses.
Determine the values of m and n when the following mass of the Earth is written in scientific notation:
5,970,000,000,000,000,000,000,000 kg - CORRECT ANSWER✅✅✅m, n = 5.97, 24
Determine the values of m and n when the following average distance from the Sun to the Earth is
written in scientific notation: 150,000,000,000 mm. - CORRECT ANSWER✅✅✅m,n = 1.5, 11
Determine the values of m and n when the following charge of a proton is written in scientific notation:
0.000000000000000000160 C. - CORRECT ANSWER✅✅✅m,n = 1.60, -19
Determine the values of m and n when the following average magnetic field strength of the Earth is
written in scientific notation: 0.0000451 T - CORRECT ANSWER✅✅✅m, n = 4.51, -5
The mass of a high speed train is 4.5×105 kg, and it is traveling forward at a velocity of 8.3×101 m/s.
Given that momentum equals mass times velocity, determine the values of mm and n when the
momentum of the train (in kg⋅m/s) is written in scientific notation. - CORRECT ANSWER✅✅✅m,n =
3.7,7
Given that average speed is distance traveled divided by time, determine the values of m and n when
the time it takes a beam of light to get from the Sun to the Earth (in s) is written in scientific notation.
Note: the speed of light is approximately 3.0×108 m/s. - CORRECT ANSWER✅✅✅m,n = 5.0, 2
In an experiment you are performing, your lab partner has measured the distance a cart has traveled:
28.4inch. You need the distance in units of centimeter and you know the unit equality
, 1inch=2.54centimeter. By which conversion factor will you multiply 28.4inch in order to perform the
unit conversion?
a. 2.54 centimeter/ 1 inch
b. 2.54 inch / 1 centimeter
c. 1 inch / 2.54 centimeter
d. 1 centimeter/ 2.54 inch - CORRECT ANSWER✅✅✅a. 2.54 centimeter/ 1 inch
You would like to know whether silicon will float in mercury and you know that can determine this
based on their densities. Unfortunately, you have the density of mercury in units of kilogram/meter^3
and the density of silicon in other units: 2.33 gram/ centimeter^3. You decide to convert the density of
silicon into units of kilogram/ meter^3 to perform the comparison. By which combination of conversion
factors will you multiply 2.33 gram/ centimeter^3 to perform the unit conversion? - CORRECT
ANSWER✅✅✅1 kilogram/ 10^3 gram × 1 centimeter/ 10^−2meter × 1 centimeter/ 10^−2 meter × 1
centimeter 10^−2 meter
You have negotiated with the Omicronians for a base on the planet Omicron Persei 7. The architects
working with you to plan the base need to know the acceleration of a freely falling object at the surface
of the planet in order to adequately design the structures. The Omicronians have told you that the value
is gOP7=7.29gOP7=7.29 flurg grom^2, but your architects use the units meter second^2, and from your
previous experience you know that both the Omicronians and your architects are terrible at unit
conversion. Thus, it's up to you to do the unit conversion. Fortunately, you know the unit equality
relationships: 5.24 flurg = 1 meter and 1 grom = 0.493 second. What is the value of gOP7 in the units
your architects will use, in meter/second^2? - CORRECT ANSWER✅✅✅gOP7 = 5.72
meter/ second^2
A student solving for the acceleration of an object has applied appropriate physics principles and
obtained the expression a = a1 + F/m where a1=3.00 meter/second2, F=12.0 kilogram⋅meter/second2
and m=7.00 kilogram. First, which of the following is the correct step for obtaining a common
denominator for the two fractions in the expression in solving for a? - CORRECT ANSWER✅✅✅a=
(m/m⋅a1/1)+(1/1⋅F/m)
Next, based on the correct answer from Part A, which of the following is the correct symbolic expression
for a? - CORRECT ANSWER✅✅✅a= ma1+F/m
Finally, what is the numerical value of aa? - CORRECT ANSWER✅✅✅a = 4.71 meter/ second^2
What is the Physics Primer?
a. A tutorial of the most important physics concepts covered in introductory physics courses.
b. A detailed explanation of all of the mathematics you will use in your introcuctory physics course.
c. A list of the most important formulas used in introductory physics courses.
d. A set of mathematics topics that are relevant to introductory physics courses. - CORRECT
ANSWER✅✅✅d. A set of mathematics topics that are relevant to introductory physics courses.
Determine the values of m and n when the following mass of the Earth is written in scientific notation:
5,970,000,000,000,000,000,000,000 kg - CORRECT ANSWER✅✅✅m, n = 5.97, 24
Determine the values of m and n when the following average distance from the Sun to the Earth is
written in scientific notation: 150,000,000,000 mm. - CORRECT ANSWER✅✅✅m,n = 1.5, 11
Determine the values of m and n when the following charge of a proton is written in scientific notation:
0.000000000000000000160 C. - CORRECT ANSWER✅✅✅m,n = 1.60, -19
Determine the values of m and n when the following average magnetic field strength of the Earth is
written in scientific notation: 0.0000451 T - CORRECT ANSWER✅✅✅m, n = 4.51, -5
The mass of a high speed train is 4.5×105 kg, and it is traveling forward at a velocity of 8.3×101 m/s.
Given that momentum equals mass times velocity, determine the values of mm and n when the
momentum of the train (in kg⋅m/s) is written in scientific notation. - CORRECT ANSWER✅✅✅m,n =
3.7,7
Given that average speed is distance traveled divided by time, determine the values of m and n when
the time it takes a beam of light to get from the Sun to the Earth (in s) is written in scientific notation.
Note: the speed of light is approximately 3.0×108 m/s. - CORRECT ANSWER✅✅✅m,n = 5.0, 2
In an experiment you are performing, your lab partner has measured the distance a cart has traveled:
28.4inch. You need the distance in units of centimeter and you know the unit equality
, 1inch=2.54centimeter. By which conversion factor will you multiply 28.4inch in order to perform the
unit conversion?
a. 2.54 centimeter/ 1 inch
b. 2.54 inch / 1 centimeter
c. 1 inch / 2.54 centimeter
d. 1 centimeter/ 2.54 inch - CORRECT ANSWER✅✅✅a. 2.54 centimeter/ 1 inch
You would like to know whether silicon will float in mercury and you know that can determine this
based on their densities. Unfortunately, you have the density of mercury in units of kilogram/meter^3
and the density of silicon in other units: 2.33 gram/ centimeter^3. You decide to convert the density of
silicon into units of kilogram/ meter^3 to perform the comparison. By which combination of conversion
factors will you multiply 2.33 gram/ centimeter^3 to perform the unit conversion? - CORRECT
ANSWER✅✅✅1 kilogram/ 10^3 gram × 1 centimeter/ 10^−2meter × 1 centimeter/ 10^−2 meter × 1
centimeter 10^−2 meter
You have negotiated with the Omicronians for a base on the planet Omicron Persei 7. The architects
working with you to plan the base need to know the acceleration of a freely falling object at the surface
of the planet in order to adequately design the structures. The Omicronians have told you that the value
is gOP7=7.29gOP7=7.29 flurg grom^2, but your architects use the units meter second^2, and from your
previous experience you know that both the Omicronians and your architects are terrible at unit
conversion. Thus, it's up to you to do the unit conversion. Fortunately, you know the unit equality
relationships: 5.24 flurg = 1 meter and 1 grom = 0.493 second. What is the value of gOP7 in the units
your architects will use, in meter/second^2? - CORRECT ANSWER✅✅✅gOP7 = 5.72
meter/ second^2
A student solving for the acceleration of an object has applied appropriate physics principles and
obtained the expression a = a1 + F/m where a1=3.00 meter/second2, F=12.0 kilogram⋅meter/second2
and m=7.00 kilogram. First, which of the following is the correct step for obtaining a common
denominator for the two fractions in the expression in solving for a? - CORRECT ANSWER✅✅✅a=
(m/m⋅a1/1)+(1/1⋅F/m)
Next, based on the correct answer from Part A, which of the following is the correct symbolic expression
for a? - CORRECT ANSWER✅✅✅a= ma1+F/m
Finally, what is the numerical value of aa? - CORRECT ANSWER✅✅✅a = 4.71 meter/ second^2
