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Neko [114]
3 years ago
8

A person walks first at a constant speed of 5.40 m/s along a straight line from point to point and then back along the line from

to at a constant speed of 3.10 m/s. (a) What is her average speed over the entire trip
Physics
1 answer:
rosijanka [135]3 years ago
6 0

Answer: The average speed over the entire trip is 3.94 m/s

Explanation:

As we know : speed=\frac{distance}{time}

Let the distance of straight line from point to point be = d

Total distance covered = 2d

Time taken to cover the forward journey = \frac{d}{5.40}

Time taken to cover the backward journey = \frac{d}{3.10}

Total time for the journey = Time taken to cover the forward journey  + Time taken to cover the backward journey  = \frac{d}{5.40}+\frac{d}{3.10}

Average speed = \frac{\text {total distance}}{\text {total time}}=\frac{2d}{\frac{d}{5.40}+\frac{d}{3.10}}=3.94m/s

Thus  average speed over the entire trip is 3.94 m/s

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10 basic rules of badminton?​
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Answer:

The 10 rules of badminton are as follows:

1. A game starts with a coin toss. Whoever wins the toss gets to decide whether they would serve or receive first OR what side of the court they want to be on. The side losing the toss shall then exercise the remaining choice.

2. At no time during the game should the player touch the net, with his racquet or his body.

3. The shuttlecock should not be carried on or come to rest on the racquet.

4. A player should not reach over the net to hit the shuttlecock.

5. A serve must carry cross court (diagonally) to be valid.

6. During the serve, a player should not touch any of the lines of the court, until the server strikes the shuttlecock. During the serve the shuttlecock should always be hit from below the waist.

7. A point is added to a player's score as and when he wins a rally.

8. A player wins a rally when he strikes the shuttlecock and it touches the floor of the opponent's side of the court or when the opponent commits a fault. The most common type of fault is when a player fails to hit the shuttlecock over the net or it lands outside the boundary of the court.

9. Each side can strike the shuttlecock only once before it passes over the net. Once hit, a player can't strike the shuttlecock in a new movement or shot.

10. The shuttlecock hitting the ceiling, is counted as a fault.

Explanation:

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3 years ago
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Are temperature and thermal energy the same thing justify your answer
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6 0
4 years ago
An elevator cable breaks when a 925-kg elevator is 28.5 m above the top of a huge spring Ak = 8.00 * 104 N????mB at the bottom o
rosijanka [135]

Answer:

a) = 258352.5J

b) = 23.63 m/s

c) = 1.8m

Explanation:

Data;

Mass = 925kg

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Force constant (k) = 8.0*10⁴ N/m

g = 9.8 m/s²

a) = work = force * distance

But force = mass * acceleration

Force = 925 * 9.8 = 9065N

Work = F * s = 9065 * 28.5 = 258352.5J

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a = v² / 2s

v² = a * 2s

v² = 9.8 * (2 * 28.5)

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(2 * 258352.5) = 8.0*10⁴x²

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X² = 516705 / 8.0*10⁴

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