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In a second ODI match between England an...

In a second ODI match between England and India Bhuwnesh kumar bowled his medium fast bowling. He starts his run up from the distance of `50m` from the stumps (bowling end) and at the time of bowling a ball,his speed is `36(km)//(hr)` and the speed of ball is `144(km)//(hr)`.
If his mass is `70 kg` and mass of the ball is `(1)/(4)kg` and the heat produce in his body is one tenth of the total work done by him, then
Energy spent by bowler in throwing one ball is `:-`

A

`3500` `J`

B

`200` `J`

C

`4070` `J`

D

`3700` `J`

Text Solution

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The correct Answer is:
To solve the problem, we need to calculate the energy spent by Bhuvnesh Kumar in throwing one ball. We will follow these steps: ### Step 1: Convert Speeds from km/hr to m/s - The speed of Bhuvnesh Kumar (V1) is given as 36 km/hr. - To convert this to m/s, we use the conversion factor: \[ V1 = 36 \times \frac{1000}{3600} = 10 \text{ m/s} \] - The speed of the ball (V2) is given as 144 km/hr. - Similarly, we convert this to m/s: \[ V2 = 144 \times \frac{1000}{3600} = 40 \text{ m/s} \] ### Step 2: Calculate the Work Done by the Bowler The work done (W) can be calculated using the formula: \[ W = \frac{1}{2} m_1 V1^2 + \frac{1}{2} m_2 V2^2 \] Where: - \( m_1 = 70 \text{ kg} \) (mass of the bowler) - \( m_2 = \frac{1}{4} \text{ kg} \) (mass of the ball) Substituting the values: \[ W = \frac{1}{2} \times 70 \times (10)^2 + \frac{1}{2} \times \frac{1}{4} \times (40)^2 \] Calculating each term: - For the bowler: \[ W_1 = \frac{1}{2} \times 70 \times 100 = 3500 \text{ J} \] - For the ball: \[ W_2 = \frac{1}{2} \times \frac{1}{4} \times 1600 = \frac{800}{4} = 200 \text{ J} \] Thus, the total work done is: \[ W = 3500 + 200 = 3700 \text{ J} \] ### Step 3: Calculate the Total Energy Spent by the Bowler According to the problem, one-tenth of the total work done is lost as heat. Therefore, the energy spent (E) can be calculated as: \[ E = W + \frac{1}{10} W \] This can be rewritten as: \[ E = W \left(1 + \frac{1}{10}\right) = W \times \frac{11}{10} \] Substituting the value of W: \[ E = 3700 \times \frac{11}{10} = 4070 \text{ J} \] ### Final Answer The energy spent by the bowler in throwing one ball is: \[ \boxed{4070 \text{ J}} \]

To solve the problem, we need to calculate the energy spent by Bhuvnesh Kumar in throwing one ball. We will follow these steps: ### Step 1: Convert Speeds from km/hr to m/s - The speed of Bhuvnesh Kumar (V1) is given as 36 km/hr. - To convert this to m/s, we use the conversion factor: \[ V1 = 36 \times \frac{1000}{3600} = 10 \text{ m/s} \] ...
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In a second ODI match between England and India Bhuwnesh kumar bowled his medium fast bowling. He starts his run up from the distance of 50m from the stumps (bowling end) and at the time of bowling a ball,his speed is 36(km)//(hr) and the speed of ball is 144(km)//(hr) . If his mass is 70 kg and mass of the ball is (1)/(4)kg and the heat produce in his body is one tenth of the total work done by him, then Select the incorrect statement :

In a second ODI match between England and India Bhuwnesh kumar bowled his medium fast bowling. He starts his run up from the distance of 50m from the stumps (bowling end) and at the time of bowling a ball,his speed is 36(km)//(hr) and the speed of ball is 144(km)//(hr) . If his mass is 70 kg and mass of the ball is (1)/(4)kg and the heat produce in his body is one tenth of the total work done by him, then If he accelerates uniformly to the sumps find the average friction force acting on him :-

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