Related questions with answers

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Cites as a pitfall the utilization of a subset of the performance equation as a performance metric. To illustrate this, consider the following two processors. P1 has a clock rate of 4 GHz, average CPI of 0.9, and requires the execution of 5.0E9 instructions. P2 has a clock rate of 3 GHz, an average CPI of 0.75, and requires the execution of 1.0E9 instructions. 1. One usual fallacy is to consider the computer with the largest clock rate as having the largest performance. Check if this is true for P1 and P2. 2. Another fallacy is to consider that the processor executing the largest number of instructions will need a larger CPU time. Considering that processor P1 is executing a sequence of 1.0E9 instructions and that the CPI of processors P1 and P2 do not change, determine the number of instructions that P2 can execute in the same time that P1 needs to execute 1.0E9 instructions. 3. A common fallacy is to use MIPS (millions of instructions per second) to compare the performance of two different processors, and consider that the processor with the largest MIPS has the largest performance. Check if this is true for P1 and P2. 4. Another common performance figure is MFLOPS (millions of floating-point operations per second), defined as MFLOPS = No. FP operations / (execution time x 1E6) but this figure has the same problems as MIPS. Assume that 40% of the instructions executed on both P1 and P2 are floating-point instructions. Find the MFLOPS figures for the programs.

Question

Rahul sits in a chair reading a book. Which force is equal to the force Rahul exerts on Earth?

A. Rahul’s weight
B. the chair’s weight
C. the sum of the weights of Rahul and the book
D. the sum of the weights of the chair, Rahul, and the book.

Solution

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Answered 8 months ago

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The Earth's surface, just like everything in nature, obeys Newton's third law, which states that every action will yield an equal or opposite reaction, or in our case, every force will be met with equal counterforce.

The task correctly states that it is weight, our task is to determine which weight. While B. might sound appealing because the chair is one in direct contact with the surface, let's not forget that Rahul and the book both contribute their weight to the chair, and as a result, the Earth will respond with the force equal to the sum of Rahul, chair, and the book.

Consequently, the correct answer is D.