Note the expression: y - A/x^3. Which statement is most consistent with this exp

Question

Note the expression: y - A/x^3. Which statement is most consistent with this expression? y is less than A If x La halved, y is multiplied by eight If x is doubled, y is multiplied by a factor of 3 y is greater than x A furlong la a distance of 220 yards. A fortnight is a time period of 2 week a race horse is running at a speed of 5 yards' par second. What is his speed in furlongs' par fortnight? 27, 491 furlongs/fortnights 13.674 furlongs/fortnight 6, 221 furlongs/fortnights 2, 749 furlongs/fortnight S = 45 S = 98 S = 112 S = 375 When NASA was cumulating with astronauts on the moon, the time from sanding to receiving was 1.28 s. Find the distance from Barth to the moon. (The speed of radio waves is 3 times 10^8 m/a). 240.000 km 384.000 km 480.000 km 768.000 km A ball is pushed with an initial velocity of 4.0 m/s. The ball role downhill with a constant is the ball's velocity at the bottom of the hill 10 m/s 12 m/s 16 m/s 17 m/s

Explanation / Answer

3)(b) is the correct choice

y = A/x^3

y' = A/(x/2)^3 = 8A

y/y' = 1/8 =>y' = 8y

6) (b)384000 km is correct

s = d/t => d = sxt

s = c = 3 x 10^8 m/s

d = 3 x 10^8 x 1.28 = 3.84 x 10^8 m = 384 000 km

Hence, (b)384000 km is correct

7)(d)17 m.s

from eqn of motion

v = u + at

v = 4 + 1.6 x 8 = 16.8 m/s

Hence, v = 16.8 m/s = 17 m/s

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