<p>I am taking the SATII Physics on June 3. I need some help on these questions please.</p>
<li>A satellite orbits a planet at a radius R with a period T. What is the magnitude of its centripetal acceleration?</li>
</ol>
<p>(A) (4pi^2 times R^2)/T
(B) (4pi^2 times R^2)/T^2
(C) (4pi^2 times R^2)/T^2
(D) (4pi^2 times R)/T^2
(E) (4pi^2 times R)/T</p>
<li>An object moving horizontally with speed v falls off the edge of a vertical cliff and lands a distance d from the base of the cliff. If it had landed a distance 2d from the base of the cliff, how fast would the object had to have been moving?</li>
</ol>
<p>(A) v
(B) v times sqrt(2)
(C) 2v
(D) 4v
(E) It cannot be determined unless the height of the cliff is known.</p>
<li>A cylinder with a height of 3.0 m, cross sectional area of 0.5 m^2, and total mass of 0.90 kg is placed in a tank containing a fluid. If equilibrium is established when two-thirds of the cylinder is submerged, what is the density of the fluid?</li>
</ol>
<p>(A) 0.3 kg/m^3
(B) 0.45 kg/m^3
(C) 0.9 kg/m^3
(D) 1.2 kg/m^3
(E) 3.0 kg/m^3</p>
<li>A carnot heat engine intakes 1000 K air and releases exhaust at 300 K. What is the efficiency of this engine?</li>
</ol>
<p>(A) 30%
(B) 50%
(C) 60%
(D) 70%
(E) 75%</p>
<li>Four 1.5 x 10^-3 uC charges are placed on the corners of a square. If the potential at the center of the square is 18 V, what is the most nearly length of a side of the square?</li>
</ol>
<p>(A) 2.0 m
(B) 2.1 m
(C) 3.0 m
(D) 4.2 m
(E) 6.0 m</p>