Chp. 1 Midterm Review

Question 1

The metric system is preferred over the British system in science for the following main reason.

Answer 1

Conversions between metric quantities are especially easy because they are all related by factors of ten.

Question 2

When adding several quantities

Answer 2

the quantities must all have exactly the same units.

Question 3

When multiplying several quantities

Answer 3

the quantities can have any combination of units.

Question 4

When dividing several quantities

Answer 4

the quantities can have any combination of units.

Question 5

When subtracting several quantities

Answer 5

the quantities must all have exactly the same units.

Question 6

In Einstein’s famous equation E = mc2, describing the relationship between matter and energy, E stands for energy, m stands for mass, and c is the speed of light in vacuum. What are the SI units of E?

Answer 6

kg · m2 / s2

Question 7

Using dimensional analysis, which one of the following equations is dimensionally correct? In these equations, x has units of meters, t has units of seconds, v has units of meters per second, and a has units of meters per second2.

Answer 7

t2 = x/a

Question 8

The position, x, of an object is given by the equation x = A + Bt +Ct2, where t refers to time. What are the dimensions of A, B, and C?

Answer 8

distance, distance/time, distance/time2