A fisherman sees 7 wave crests go by in 10.0 s. The crests are 2.43 m apart. Find the period of the wave. (Unit = s)
2 answers:
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Answer:
It takes 20 minutes and 24 seconds more on Friday than that of normal days.
Explanation:
Given:
Average speed on normal days (s₁) = 115 km/h = 71 mi/h
Time taken on normal days (t₁) = 1 hr and 13 min
Average speed on Friday (s₂) = 90 km/h = 56 mi/h
Time taken on Friday (t₂) = ?
Distance covered is same in both case.
Converting time from minutes to hours using the conversion factor, we have:
1 min = hour
∴ 13 min =
So,
Using the distance formula for both the days, we get:
Therefore,
So, time taken on Friday is 1.56 hours.
Time taken on Friday is more and the difference is given as:
Time difference = Time taken on Friday - Time on normal days
Time difference = 1.56 - 1.22 = 0.34 hours
Converting time from hours to minutes using the conversion factor, we have:
1 hour = 60 min
∴ 0.34 hours = 0.34 × 60
= 20.4
= 20 mins + 0.4 mins
= 20 min + (0.4 × 60) = 20 mins + 24 s
So, it takes 20 min and 24 seconds more on Friday than that of normal days.
Answer:
-10 N, not balanced
Explanation:
Force is a vector quantity, so in order to find the net force on an object, we must use vector addition rule.
This means that if two forces acting on an object along the same line, we have to choose one direction as positive, and write the two forces with the correct sign.
In this problem, we have two forces acting along a line on the car:
- A first force of
- A second force of
Therefore, the net force on the car is:
Moreover, the net force on an object is said to be "balanced" if it is zero: in this case, it is not zero, so it is not balanced.