Blake and Sandra are having a rummage sale. Blake drags 3 boxes a distance of 10 meters each. He exerts a force of 20 newtons on each box. Sandra drags 4 boxes a distance of 12 meters each. She exerts a force of 15 newtons on each box. Blake takes 2 minutes to complete his work. Sandra takes 4 minutes.
Blake does
work than Sandra. Blake’s power is
than Sandra’s power. (Hint: Use W = Fd and .)

Answers

Answer 1

Compared to Sandra, Blake work less. Sandra cannot match Blake's power.

What is work?

The application of force along a displacement results in the transfer of energy to or from an object, known as work. The work is defined as the sum of the force intensity and the distance traveled for a constant force acting in the direction of motion. If a force when applied has a component that moves the point of application away from the origin, such force is said to do positive work. A force performs negative work if, at the point of application, one of its components is in the opposite direction as the displacement. Due to the fact that work is a scalar quantity, it only has magnitude and no direction. Energy is moved from one location or one form to another through work.

Calculation:

Three boxes, each weighing 20 N, are spaced apart by 10 meters.

Blake's work is 3 × 10m × 20N, which is 600 J.

300 J/min times 600 J/ 2 min is power.

To Sandra:

4 boxes, each 15 N, spaced 12 meters apart.

Work completed by Sandra equals 4 × 15 N × 12 m = 720 J.

Power = 720 J/4 min = 180 J/min

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Use the excerpt and your knowledge of social studies to answer the following question.



Dear Brother, . . . Houses are very sorry in this country for it is a considerable job to build a cabin … owing to the timber being so scarce and plank is out of the question. The people use what they call puncheon which is ash saplings split open and laid down for floors. . . . a man can raise as many cattle as he pleases without feeding them at all and can kill fat beeves anytime in the winter. . . . The grass is now green . . . Excerpt from a letter written by C. Baker in 1853. Switzer, David. It’s Our Dallas County. 1954.



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Answers

The excerpt above describes which era in Texas history in Spanish Colonial.

Hence, Option A is correct.

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complete question:

answering questions about what she had read in her psychology textbook improves shauna's memory of the material more effectively than rereading the textbook material. this best illustrates

A) the peg-word system.

B) automatic processing.

C) the self-reference effect.

D) the testing effect.

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