If two balls have the same volume, 1. If two balls have the same volume, but ball A has twice as much mass as ball B, which one will have the greater density?

2. f ball C is 3 times the volume of ball D and ball D has 1/3 the mass of ball C, which has the greater density?

3. If two balls have the same mass, but ball P is twice as large as ball Q, which one will have the greater density?

4. If ball X is twice as big as ball Y and weighs only half as much as ball Y, then which one will have the greater density?

Sorry i don’t know what to do

Answertraveling around a circular trackexplanation"traveling around a circular track" is the best answer as you could be traveling around a circular track at a constant speed. your velocity would therefore have the same magnitude but will always be constantly direction. since acceleration is the rate of change of velocity, the rate of change will only involve the direction of velocity and not the magnitude.wrong choices: "an object at rest" does not accelerate at all"increasing speed while traveling around a curve" means that the acceleration will not be constant due to only change in direction; it will be constant due to both magnitude and direction"an object in free fall" does not necessarily change direction 

If the heat engine is a perfect carnot cycle engine, thenefficiency = (t2-t1)/t2   where t1=temperature of cold reservoir ( ° k) = 135            t2=temperature of hot reservoir ( ° k)   = 325thereforeefficiency = (t2-t1)/t2 = (325-135)/325 = 0.5846 = 58%  note: this is the theoretical maximum efficiency of a perfect heat engine.   real-life engines do not achieve this value.

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