The student draws an arrow on the paper to mark the incident ray. She marks the path of the emergent ray with crosses A, B and C.
‘She removes the block from the paper and places a protractor over the outline of the
block, as shown in Figure 2
Figure 2
protractor .
SE re
fi ©
i. . ey x incident ray
; +
,- *® Cla ai 7y
' VLA 1
‘ Las te] |
. CAs I ‘t CF j
at %7
SS PE SS oy
ae tae
outine of transparent
semicircular block
“Bs
x
c
Determine. using Figure 2. the refractive index of the block.
[4 marks)

Which simple machine is not part of this compound machine? a. lever b. pulley c. inclined plane d. wheel and axle

I'm kinda lost ! 1. when marilyn takes her pet dog for a walk, the dog walks at a veryconsistent pace of 0.55 m/s. draw a position-time graph to representmarilyn's dog walking the 19.8 m distance from the front of her house tothe nearest fire hydrant.2. both car a and car bleave school when a stopwatch reads zero. car atravels at a constant 75 km/h, and car b travels at a constant 85 km/h.a) draw a position-time graph showing the motion of both cars. howfar are the two cars from school when the stopwatch reads 2 hrs? calculate the distances and show them on your graph.b) both cars passed a gas station 120 km from the school. when dideach car pass the gas station? calculate the times and show themon your graph.3. the figure below shows the position-time graph showing a shopper'smovement up and down the aisle at a store.a) write a story describing the shopper's movements at the store.b) when does the shopper have a position of 6 m? c) how much time passes between when the shopper enters the aisleand when he gets to a position of 12 m? what is the shopper's averagevelocity between 37 s and 46 s?

Iwill give 30 points to whoever answers ! what is the formula for actual mechanical advantage and ideal mechanical advantage?