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Twelfth Grade (Grade 12) Mechanics Questions

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Grade 12 Forces and Motion
What is the correct definition for the term "position"?
  1. the change in position of an object
  2. the distance and direction of an object from a reference point.
  3. an amount o f space between two things or people .
  4. none of the above
Grade 12 Forces and Motion
What is the correct definition for the term "displacement"?
  1. an amount of space between two things or people
  2. the change in position of an object
  3. the distance and direction of an object from a reference point
  4. none of the above
Grade 12 Forces and Motion
When you whirl a rock at the end of a string, it will follow a circular path. What will happen to the rock if the string breaks?
  1. The rock will fly off in a straight line.
  2. The rock will immediately fall to the ground.
  3. The rock will continue to move in a circular path.
  4. The rock will float 0.5 seconds before falling
Grade 12 Fluid Mechanics
Under what conditions do real gases behave almost like ideal gases?
  1. high temperature, low pressure
  2. high temperature, high pressure
  3. low temperature, high pressure
  4. low temperature, low pressure
Grade 12 Forces and Motion
A car with mass m travels around a curve with velocity v. What do you know about the centripetal force if the velocity triples?
  1. Nothing
  2. The centripetal force triples
  3. The centripetal multiplies by 9
  4. The centripetal force divides by 3
Grade 12 Forces and Motion
You want to launch a satellite into Earth orbit. You already know Earth’s mass and the satellite’s mass. What additional information do you need to calculate the gravitational force that will act on it?
  1. The height it will have
  2. Earth's distance from the Sun
  3. The acceleration of gravity at the surface
  4. The satellite's size
Grade 12 Forces and Motion
What relationship exists between the radius of a circle and the centripetal acceleration?
  1. Direct
  2. Exponential
  3. Inverse squared
  4. Inverse
Grade 12 Energy and Momentum
A 55 kg person walks up a staircase, and a second 55 kg person runs up the staircase. Who develops more power and why?
  1. the person who walks up because he takes more time, using more energy
  2. the person who runs up because he takes less time
  3. same power for both because both cover the same distance with the same force
  4. not enough information to determine
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