Physics, 24.10.2019 23:43 alyssa32900

Jason takes off from rest across level water on his jet-powered skis. the combined mass of jason and his skis is 75 kg (the mass of the fuel is negligible). the skis have a thrust of 200 n and a coefficient of kinetic friction on water of 0.10. unfortunately, the skis run out of fuel after only 17 s. how far has jason traveled when he finally coasts to a stop? a.) 250 mb.) 350 mc.) 490 md.) 660 m

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Answer from: chryssiem16

Option D

660 m

Explanation:

ma=Thrust – friction where m is mass and a is acceleration

ma=200 - \mu mg

Substituting m for 75 kg, $\mu$ for 0.10, g for 9.81

75a=200 - 0.10*75*9.81

75a= 200-73.575

a=126.425/75

$a = 1.685667 m/s^{2}$

For the first 17 seconds

Velocity v = a*t = 1.685667 17 = 28.65633 m/s

Distance = $0.5*a*t^{2} = 0.5*1.685667*17^{2}$ = 243.5788 m

After fuel is over

Force acting is only friction

$F = ma = -\mu mg$ since m are common

$a = -\mu g = -0.1*9.81 = -0.981 m/s^{2}$

$v^{2} - u^{2} = 2as$

Where v is final velocity which is zero because after running out of fuel, skis come to rest. U is initial velocity which is 28.65633 m/s

$0 - 28.65633^{2} = 2*-0.981*s$

s = 418.5450765 m

Total distance = s1+s2 = 243.5788 m + 418.5450765 m m = 662.1239098 m

Distance covered is approximately 660 m

Answer from: Quest

most voltage drop calculators want the distance between the source and destination. then internally, they double it so both the source and return wires are calculated. but you need to know which distance the calculator uses so you're not half of what you should be or double what you should be.

most circuit breakers will not take a #6 directly, so the electrician will have to splice on a smaller pigtail. you also have to upsize the grounding wire when you upsized the ungrounded (hot) wire (see note in 250.122). this will preclude using most cable assemblies, as a cable with #6 copper will most likely only have a #10 grounding conductor. you need a #6 grounding conductor if the circuit is 20a. a #8 cable is no better, as it will have a #10 grounding conductor too. but most 20a breakers will take a #8 directly.

in your related post, you didn't say what type of load this is. if it is a light or heater, voltage drop won't be a big issue. if this is a motor, the current needs are huge at startup and the voltage drop can pose a problem. if this is a motor, knowing if the motor is under much load during startup will answer the voltage drop effect (a saw is easier to start than a compressor).

Answer from: Quest

the answer is 3.1 his answer is wrong mines is right

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Jason takes off from rest across level water on his jet-powered skis. the combined mass of jason and...