The figure shows the graph of 
versus time for an object moving along the x-axis. What is the acceleration at t = 7.0 s?
A. 4.0 
B. 5.0
C. 0.5
D. 0.4
B. 5.0
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What protects Earth from the high energy particles ejected from the Sun (the solar wind)?
a. the troposphere b. the stratosphere c. the exosphere d. the magnetosphere e. the Van Allen radiation belts
A capacitor consists of a set of two parallel plates of area A separated by a distance d. This capacitor is connected to a battery and charged until its plates carry charges +Q and -Q
If the separation between the plates is doubled, the electrical energy stored in the capacitor will A) double. B) quadruple. C) be cut in half. D) be cut in fourth. E) not change.
A heat conducting rod, 1.40 m long, is made of an aluminum section that is 0.50 m long and a copper section that is 0.90 m long. Both sections have cross-sectional areas of of 0.00040 m2
The aluminum end and the copper end are maintained at temperatures of 40°C and 280°C, respectively. The thermal conductivity of aluminum is 205 W/m?K of copper is 385 W/m?K. The rate at which heat is conducted in the rod is closest to A) 20 W. B) 18 W. C) 23 W. D) 25 W. E) 28 W.
An electron moving perpendicular to a uniform magnetic field of 3.2 × 10-2 T moves in a circle of radius 0.40 cm. How fast is this electron moving? (e = 1.60 × 10-19 C, melectron = 9.11 × 10-31kg)
A) 2.2 × 107 m/s B) 1.9 × 107 m/s C) 1.9 × 106 m/s D) 3.0 × 107 m/s E) 0.80 × 107 m/s