A particle moves in the xy plane in a circle centered on the origin. At a certain instant the velocity and acceleration of the particle are 
m/s and 
m/s2. What are the x and y coordinates of the particle at this moment?
A. x = ?4.4 m, y = 0
B. x = +5.3 m, y = 0
C. x = ?5.3 m, y = 0
D. x = +4.4 m, y = 0
E. x = ?1.8 m, y = 0
Answer: B
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The foot pedal on hydraulic brake system exerts a force of 45 lbs on a piston with a diameter of 1.00 cm. The brake fluid in the brake system exerts the pressure from the foot pedal on a brake pad piston with a diameter of 2.50 cm. The force on the brake pad is
A. 133 lbs. B. 150 lbs. C. 281 lbs. D. 350 lbs. E. 402 lbs.
Carnot Engine: A heat engine having the maximum possible efficiency has an efficiency of 35.0% when operating between two heat reservoirs. If the temperature of the hot reservoir is 700 K, what is the temperature of the cold reservoir?
A. 200 K B. 245 K C. 350 K D. 455 K E. 600 K
A sample of helium has a volume of 2.00 liters, a temperature of 20.0
and a pressure of 2.50 atmospheres. What is the energy needed to heat the sample of helium gas from 20.0
to 95.0 
at constant volume?
A. 88.0 J B. 137 J C. 175 J D. 207 J E. 476 J
What is the source of your type of energy (where do we get it)?
What will be an ideal response?