An automobile manufacturer claims that its product will, starting from rest, travel 0.40 km in 9.0 s. What is the magnitude of the constant acceleration required to do this?
a. 9.9 m/s2
b. 8.9 m/s2
c. 6.6 m/s2
d. 5.6 m/s2
e. 4.6 m/s2
A
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Addition by 1. Components: Vector 
has a magnitude of 6.0 m and points 30° north of east. Vector 
has a magnitude of 4.0 m and points 30° west of north. The resultant vector 
+ 
is given by
A. 9.8 m at an angle of 64° east of north. B. 9.8 m at an angle of 26° north of east. C. 7.2 m at an angle of 26° east of north. D. 3.3 m at an angle of 26° north of east. E. 3.3 m at an angle of 64° east of north.
X-Ray Diffraction: Certain planes of a crystal of halite have a spacing of 0.399 nm. The crystal is irradiated by a beam of x-rays. First order constructive interference occurs when the beam makes an angle of 20° with the planes of the crystal surface. What angle does the beam make with the crystal planes for second order constructive?
A. 37° B. 40° C. 43° D. 46° E. 49°
A rocket of length 80 m sits on a launch pad. The center of mass of the rocket is located 32 m above the ground. The rocket is launched to an altitude of 100 km. Where is the location of the center of mass of the total rocket-fuel system at the altitude of 100 km?
A. at ground level B. 32 m above ground level C. 40 m above ground level D. 80 m above ground level E. 50 km above ground level
What two things do we need to measure in order to determine a star's luminosity?
A) apparent brightness and distance B) distance and mass C) apparent brightness and temperature D) apparent brightness and mass