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3 years ago

6

Someone please help me on these two

1 answer:

yarga [219]3 years ago

7 0

i think its D 12345678901234567890

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A cobalt atom contains 27 protons, 32 neutrons, and 27 electrons. What is

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32? I could be wrong but I’m going with that answer choice

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Understanding that if we say something unkind to someone else his or her

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3 years ago

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zimovet [89]

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3 years ago

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What is specific heat? List the formula

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3 years ago

A 26-kg sled is on a snow-covered slope. The coeﬃcients of friction between the sled’s runners and the snow are µs = 0.096 and µ

sweet-ann [11.9K]

Answer:

Explanation:

Given

mass of sled =26 kg

coefficient of static friction $\mu _s=0.096$

coefficient of kinetic friction $\mu _k=0.072$

In order to move sled from rest we need to provide a force greater than static friction which is given by

$f_s=\mu mg=0.096\times 26\times 9.8=24.46 N$

After Moving Sled kinetic friction comes in to play which is less than static friction

$f_k=\mu _kmg=0.072\times 26\times 9.8=18.34 N$

therefore minimum force to keep moving sledge at constant velocity is 18.34 N

3 0

3 years ago