RECF Mechanical

RECF Mechanical

8th - 12th Grade

•

26 Qs

quiz-placeholder

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RECF Mechanical

RECF Mechanical

Assessment

Quiz

•

Other

•

8th - 12th Grade

•

Practice Problem

•

Medium

Created by

Sabrina Alvarez

Used 499+ times

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26 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

To raise the arm of a robot, the last of 4 spur gears in a simple gear train must rotate clockwise. in what direction does the input (first) gear turn?

Clockwise

Counterclockwise

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A robot has wheels with 4-inch diameter. each wheel rolls 5 revolutions on a horizontal surface without slipping. how far did the robot travel?

26.8 inches

62.8 inches

82.6 inches

68.2 inches

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following statements is equivalent of the first law of thermodynamics?

In all energy exchanges, if no energy enters or leaves the system, the potential energy of the state will always be less than that of the initial state

The entropy of a perfect crystal of a pure substance approaches zero as the temperature approaches zero.

Energy cannot be created or destroyed

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

One hot day matt's air conditioner broke. He thought of an idea to cool his house by opening his refrigerator. Three hours later his house temperature went up by two degrees. Why did this happen?

The condenser on the refrigerator ran constantly

The ac started working again

The fridge broke

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Two children are playing on a see-saw. The one on the left weighs 80 lbs. and the one on the right weighs 100 lbs. If the child on the left is 3 feet from the pivot, how far must the child from the right be for the see-saw to be balanced?

2.4 ft

4.2 ft

3.6 ft

6.3 ft

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following types of gears would be found in a parallel shaft gear train?

Gear Rack

Worm Gear

Screw Gear

Spur Gear

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What type of simple machine is in the nutcracker pictured?

Screw

Wheel and axle

Lever

Inclined plane

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