Question

6) An auto manufacturer advertises that their car can go "from zero to sixty in eight seconds." This is a description of what characteristic of the car's motion? A) instantaneous speed B) displacement C) average speed D) instantaneous acceleration E) average acceleration 7) A light-year is the distance that light travels in one year. The speed of light is 3.00 x 108 m/s. How many miles are there in one light-year? (1 mi = 1609 m, 1 y = 365 d) A) 5.88 1012 mi B) 5.88 x 1015 mi C) 9.46 x 1012 mi D) 9.46 x 1015 mi 8) You leave on a 549-mi trip in order to attend a meeting that will start 10.8 h after you begin your trip. Along the way you plan to stop for dinner. If the fastest you can safely drive is 65 mi/h, what is the longest time you can spend over dinner and still arrive just in time for the meeting? A) 2.6 h B) 2.4 h C) 1.9 h D) You can't stop at all. 9) A hammer is thrown upward with a speed of 14 m/s on the surface of planet X where the acceleration due to gravity is 3.5 m/s2 and there is no atmosphere. What is the speed of the hammer after 8.0 s? A) 7.0 m/s B) 14 m/s C) 64 m/s D) 21 m/s 10) A racquetball strikes a wall with a speed of 30 m/s and rebounds in the opposite direction with a speed of 26 m/s. The collision takes 20 ms. What is the average acceleration of the ball during the collision with the wall? A) 2800 m/s2 B) 0 m/s2 C) 200 m/s2 D) 1500 m/s2 E) 1300 m/s2

Answer 1

G E - average acceleratim © change of Speed over a given its time interval describes average acceleretim d= 3x108 x 365X86400 mi 1609 de 5-88x102mi option -A t 542 = © time for journey t 65 t'= 8-446 on ... the time he can Spend dinner t = 10.8 - 8:446. TE: 204h } option - B 0 v= u-gt. I VI= 14-3-588 TIVE 14 mls , o prim-B a = veu Tal = 126-301 zoxio Tal= 200 mis option - с