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pishuonlain [190]
2 years ago
13

A batter hits two baseballs with the same force. One hits the ground near third base. The other is a home run out of the park. W

here was there more work done?
Physics
2 answers:
stealth61 [152]2 years ago
7 0
At the end of the baseball bat, because with the length of the bat he had a longer reach and the end of the bat was moving faster than his hands were

Keith_Richards [23]2 years ago
7 0

Answer:

the one that went out of the park.

Explanation:

work is the total power and distance. so if it went farther, its more, because it takes more distance to make it back to the original spot.

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In the human arm, the forearm and hand pivot about the elbow joint. Consider a simplified model in which the biceps muscle is at
Salsk061 [2.6K]

Answer:

Answer is explained in the explanation section below.

Explanation:

Part A)

From conserve moment of force, we have:

F1d1 = F2d2

F1 x (3.80 x 10^{-2} m) = 15N x (15 x 10^{-2} m)

F1 = \frac{15 . 15 . 10^{-2} }{3.80 . 10^{-2} }

F1 = 59.2 N

Force exerted by the biceps when the hand is empty.

Part B)

The 80 N weight acts at 33 cm and 15 N at 15 cm, then the center of mass is:

x = \frac{m1x1 + m2x2}{m1+m2}

x = \frac{\frac{80}{9.8} (33 .10^{-2})  + \frac{15}{9.8}(15.10^{-2}   }{\frac{80}{9.8} + \frac{15}{9.8}  }

x = 30.16 x 10^{-2} m

Total Weight is:

F = 80N + 15N = 95N

From the conserve moment of force, we have:

F ( 3.8 x 10^{-2} ) = 95N (30.16 x 10^{-2})

F = 754 N

Part C:

From the above two examples solved, the force exerted by the biceps is higher than downward force, due to this muscle need to be very strong.

Part D)

The force exerted by elbow on the forearm is:

The force exerted by the elbow and biceps are in upward direction and total weight is in downward direction. So, the balancing force in vertical direction is:

F2 + 754N = 95N

F2 = 95N -754N

F2 = -659N

Negative sign shows the force is in downward direction.

Part E)

The bicep muscle acts perpendicular to the forearm, so it is lever arm stays the same. but those of the other two forces decreases as the arm is raised. There tension in the biceps muscle decreases.

Part F)

Angle = 53 degrees.

So,

Force = FcosФ

Force = 754 cos 53

Force = 453.76 N

Part G)

The value of force has gone downwards. It has decreased from that of part B.

7 0
2 years ago
Transverse waves travel with a speed of 20 m/s on a string under a tension 0f 6.00 N. What tension is required for a wave speed
Aleksandr [31]

Answer:

T_2=13.5\ N

Explanation:

Given that,

Speed of transverse wave, v₁ = 20 m/s

Tension in the string, T₁ = 6 N

Let T₂ is the tension required for a wave speed of 30 m/s on the same string. The speed of a transverse wave in a string is given by :

v=\sqrt{\dfrac{T}{\mu}}........(1)

T is the tension in the string

\mu is mass per unit length

It is clear from equation (1) that :

v\propto\sqrt{T}

\dfrac{v_1}{v_2}=\sqrt{\dfrac{T_1}{T_2}}

T_2=T_1\times (\dfrac{v_2}{v_1})^2

T_2=6\times (\dfrac{30}{20})^2

T_2=13.5\ N

So, the tension of 13.5 N is required for a wave speed of 30 m/s. Hence, this is the required solution.

5 0
3 years ago
Two forces whose resultant is 100N,are perpendicular to each other.if one of them makes an angle of 60° with the resultant, calc
DIA [1.3K]

Magnitude of the force = 50N

<u />

<u>Explanation:</u>

Let one force be X

And the second force be Y

Both the forces are perpendicular, so α = 90°

The resultant R of the two forces = 100N

Angle between resultant and 1 force, α = 60°

We know,

R² = X² + Y² + 2XYcos 90

100² = X² + Y²

If X makes an angle of Φ = 60°

Then, tan Ф =  Y sin α / X + Y cos α

Putting the values we find,

tan 60 = Y/X

Y  = √3X

Putting Y = √3X in equation 1 we get,

(X)² + (√3X)² = 100 X 100

4X² = 100 X 100

X² = 2500

X = 50N

Therefore, magnitude of the force = 50N

5 0
3 years ago
Что сделать чтоб предмет облодал магнитными свойствами?​
Brut [27]
What is the question?
4 0
3 years ago
A pen contains a spring with a spring constant of 257 N/m. When the tip of the pen is in its retracted position, the spring is c
Mandarinka [93]

Explanation:

Below is an attachment containing the solution.

3 0
3 years ago
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