Physics 011

Chapter 1: Introduction

Quiz#:1B

Mc

 1

Kinetic energy is given by the formula KE = 1/2 mv2, where m is the mass and v is the velocity. The derived SI unit of energy is the joule, J, which is equivalent to which combination of basic units?

kg m2/s2

g cm2/s2

g m2/s2

kg m/s2

 2

If 1 inch is equal to 2.5 cm, approximately how many inches are in 1000 kilometers?

2.5 x 104 in

4 x 104 in

2.5 x 107 in

4 x 107 in

 3

A marathon race is about 26 miles long. What is the length in kilometers? (1 km = 0.623 mi.)

0.024 km

16 m

42 km

52 km

 4

If a man is 6 foot 4 inches tall, what is his approximate height in centimeters? (1 in. = 2.54 cm)

230 cm

190 cm

150 cm

120 cm

 5

The terminal velocity of a drop of water falling through the atmosphere is v = (2/9) (r2 g p/n) where v is the velocity of the drop in m/s; r is the radius of the drop in m; g is the acceleration of gravity in m/s2 and p is the density of water in kg/m3. What must be the units of n, the coefficient of viscosity of the air through which the drop falls?

kg m/s

m s/kg

kg s2/m

kg/m s