PH1031C_1_Test_2

 The number 0.003010 has [ ] significant figures.

• 7

• 6

• 4

• 2

What is 0.674/0.74 to the proper number of significant figures?

• 0.91

• 0.911

• 0.9108

• 0.9

What is the sum of 1123 and 10.3 written with the correct number of significant figures?

• 1.13 × 10^3

• 1133.3000

• 1133.3

• 1133

In which case is the blue dashed vector equal to B-A ?

• A

• B

• C

• D

• Not enough information

Which is a correct statement about A+B ?

• x-component >0,

  y-component >0

• x-component >0,

  y-component <0

• x-component <0,

  y-component >0

• x-component <0,

  y-component <0

Which is a correct statement about A-B ?

• x-component >0,

  y-component >0

• x-component >0,

  y-component <0

• x-component <0,

  y-component >0

• x-component <0,

  y-component <0

What is the dot product C·D ?

• 120 (m^2)cos78°

• 120 (m^2)sin78°

• 120 (m^2)cos62°

• 120 (m^2)sin62°

• None of these

Let A=2i-2j and B=2i+2j. What is the value of the angle that lies between these two vectors?

where i, j are unit vectors in x, y directions

• 120

• 90

• 30

• 0

• -45

Standing on a roof, you simultaneously throw one ball straight up and drop another from rest. Neglecting air resistance, which ball hits the ground with greater speed?

• The ball dropped from rest

• The ball thrown straight up

• Both balls have the same speed.

Standing on a roof, you simultaneously throw one ball straight up and another one down with the same initial speed. Neglecting air resistance, which ball hits the ground with greater speed?

• The ball dropped from rest

• The ball thrown straight up

• Both balls have the same speed.