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Eleventh Grade (Grade 11) Science Questions

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Grade 11 :: Forces and Motion by kieke
Calculate the net force acting on this object, and determine, if it is moving, in which direction. The normal force is 500N, the force at C is -372N, the resistive force of friction is -32N, and the force at B is 32N.
Free Body Diagrams 2
  1. [math]F_"net"=-95N[/math]; moving to the left
  2. [math]F_"net"=872N[/math]; at rest
  3. [math]F_"net"=+95N[/math]; moving upwards
  4. impossible to determine without knowing the object's mass
Grade 11 :: Forces and Motion by kieke
If a net force diagram is drawn, such as shown below, wherein the [math]F_"norm"" at A "=-(F_g)" at C"[/math], what do you know about the object?
Free Body Diagrams 4
  1. The object is accelerating in the direction of the [math]F_"app"" at B"[/math] because there is no opposing force to B, and [math]F_"app"" at "B>0N[/math].
  2. The object is accelerating in the opposite direction of [math]F_"app"" at B"[/math] because forces act in equal but opposite pairs.
  3. The object is not moving because the [math]F_"net"=F_"norm"+F_g=0N[/math].
  4. The object is accelerating in the direction of the [math]F_"app"" at B"[/math] because the opposing [math]F_"fric"[/math] must be negligible, and [math]F_"app"" at "B>0N[/math].
Grade 11 :: Light and Optics by kieke
When an image is reflected off a convex mirror, how does the image appear to the eye?
Optics - Convex Mirror
  1. The image is magnified because a convex mirror is divergent.
  2. The image is magnified because a convex mirror is convergent.
  3. The image is reduced because a convex mirror is divergent.
  4. The image is reduced because a convex mirror is convergent.
Grade 11 :: Light and Optics by kieke
When an image is reflected off a concave mirror, how does the image appear to the eye?
Optics - Concave Mirror
  1. The image is magnified because a concave mirror is divergent.
  2. The image is magnified because a concave mirror is convergent.
  3. The image is reduced because a concave mirror is divergent.
  4. The image is reduced because a concave mirror is convergent.
Grade 11 :: Periodic Table and Elements by Ms_VThomas
Grade 11 :: Nuclear Physics by kieke
Grade 11 :: Ecology by dlfndefender
Grade 11 :: Light and Optics by kieke
Grade 11 :: Reactions by radiance
Consider the following endothermic reaction:
[math]N_2(g) + O_2(g) rarr 2NO (g) [/math]
[math]DeltaH = +180 (kJ)/(mol[/math]

Which of the following statements correctly describes this endothermic reaction?
  1. Product is less stable than the reactants
  2. Heat is evolved in this reaction
  3. Reaction proceeds spontaneously in the forward direction
  4. Enthalpy of products is less than those of reactants
Grade 11 :: Waves and Sound by kieke
Pulse with Media of Different Densities
In which end of the rope is the wavelength is always greatest?
  1. in the less dense end
  2. in the more dense end
  3. Wavelength is the same throughout.
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