Physics 011

Chapter 1

Quiz#:1

 MC#2A

 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? The correct answer: kg m2/s2 2. If 1 inch is equal to 2.5 cm, approximately how many inches are in 1000 kilometers?  The correct answer: 4 x 107 in See Section 1-6 3. A marathon race is about 26 miles long. What is the length in kilometers? (1 km = 0.623 mi.)  The correct answer: 42 km See Section 1-6 4. If a man is 6 foot 4 inches tall, what is his approximate height in centimeters? (1 in. = 2.54 cm)  The correct answer: 190 cm See Section 1-6 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?  The correct answer: kg/m s See Appendix B