Physics, 13.12.2019 21:31 SapphireWolf

Any for the questions will be great

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Answer from: aliopqwas

1) The mass of the skier, m = 51.02 kg

2) At top of the hill, v = 0

3) The velocity of the skier at the 30 m height, v = 37.04 m/s

4) The velocity of the skier at the bottom of the hill, v = 44.27 m/s

Explanation:

Given data,

The initial height of the skier from the ground, h = 100 m

The K.E of skier at 100 m = 0 J

The P.E of the skier at 100 m = 50,000 J

1) The mass of the skier,

m = P.E/ gh

= 50,000/ (9,8 x 100)

= 51.02 kg

2) The velocity of the skier at the top of the hill,

At top of the hill, the K.E = 0,

Hence,

v = 0

3) The velocity of the skier at the 30 m height,

P.E = mgh

= 51.02 x 9.8 x 30

= 14,999.88 J

E = P.E + K.E

K.E = E - P.E

= 50,000 - 14,999.88

= 35000.12 J

v = √(2 K.E/m)

= √(2 x 35000.12 / 51.02)

v = 37.04 m/s

4) The velocity of the skier at the bottom of the hill,

At bottom of the hill, P.E = 0 and K.E is maximum

K.E = 50,000 J

v = √(2 K.E/m)

= √(2 x 50000 / 51.02)

v = 44.27 m/s

Answer from: Quest

What is the things about?

Answer from: Quest

Julia would be observing a. static electricity was caused by her sweater rubbing against her shirt and transferring electrons. she didn't touch anything metal, so that would cancel out b.she most likely didn't rub her sweater against her hair either, so that cancels out c.she also didn't scoot across the carpet while trying to take her sweater off, that cancels out d.so that leaves a.a. is correct.

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