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sdas [7]
3 years ago
9

A cross-country skier can complete a 7.5 km race in 45 min. What is the skier’s average speed?

Physics
2 answers:
Triss [41]3 years ago
8 0

<u>Answer</u>

2.7778 m/s


<u>Explanation</u>

Speed is rate of change of distance with time.

It is the distance covered in a unit time.  SI units of speed in m/s. Other units are Km/h, knots e.t.c

Average speed  = (total distance covered) / (total time taken)

                             = 7.5 Km / 45 Min

                             =  1/6 Km/Min

Or,

7.5Km = (7.5 × 1000) m = 7500 m

45 min = 45 × 60 2700 seconds

Average speed = 7500/2700

                           = 2.7778 m/s

Alecsey [184]3 years ago
7 0
To calculate for the average speed, we simply divide the total distance covered by the time it takes to travel that distance. In this case, we simply divide 7.5 km with 45 min. Therefore, the skier's average speed is 0.1667 km/min. Hope this helps.
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Answer:

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Explanation:

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3 0
3 years ago
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I don't really know but i have an idea

Explanation:

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2 years ago
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5 0
3 years ago
An automobile engine delivers 55.0 hp. How much time will it take for the engine to do 6.22 × 105 J of work? One horsepower is e
Gennadij [26K]

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15.2 s

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8 0
3 years ago
On a balanced seesaw, a boy three times as heavy as his partner sits
slega [8]

Answer:

1/3 the distance from the fulcrum

Explanation:

On a balanced seesaw, the torques around the fulcrum calculated on one side and on another side must be equal. This means that:

W_1 d_1 = W_2 d_2

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W1 is the weight of the boy

d1 is its distance from the fulcrum

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d2 is the distance of the partner from the fulcrum

In this problem, we know that the boy is three times as heavy as his partner, so

W_1 = 3 W_2

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(3 W_2) d_1 = W_2 d_2

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8 0
3 years ago
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