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stira [4]
2 years ago
12

How much force is needed to accelerate a 68 kilogram skier at a rate of 1.2m/sec

Physics
2 answers:
xxMikexx [17]2 years ago
8 0

Let's use Newton's 2nd law of motion:

                                     Force = (mass) x (acceleration)

                                     Force = (68 kg) x (1.2 m/s²) =  81.6 newtons .

labwork [276]2 years ago
5 0
f=m*a

68*1.2=81.6

f=81.6
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Tatiana [17]

The person's horizontal position is given by

x=v_0\cos40^\circ t

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so your first computed time is the correct one.

The question requires a bit of careful reading, and I think there may be a mistake in the problem. The person's vertical velocity v_y at time t is

v_y=v_{0y}-gt

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x=v_{0x}(3.15\,\mathrm s)=57.9\,\mathrm m

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7 0
3 years ago
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Tech A says parallel circuits are like links in a chain. Tech B says total current in a parallel circuit equals the sum of the c
rosijanka [135]

Answer: Only Tech B is correct.

Explanation:

First, tech A is wrong.

The circuits that can be compared with links in a chain are the series circuit, and it can be related to the links in a chain because if one of the elements breaks, the current can not flow furthermore (because the elements in the circuit are connected in series) while in a parallel circuit if one of the branches breaks, the current still can flow by other branches.

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4 0
3 years ago
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goldfiish [28.3K]
Work in general is given by W=F·d where F is the force vector and d is the displacement vector.  The dot symbol is the dot product which is a measure of how parallel two vectors are.  It can be replaced by the cosine of the angle between the two vectors and the vectors replaced by their magnitudes.  If F and d are parallel then the angle is zero and the cosine is unity.  So in this case work can be defined as the product of the magnitudes of the force and distance:
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3 years ago
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Andre45 [30]

Answer:

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Explanation:

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