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3 years ago

In which situation is maximum work considered to be done by a force?

Physics

2 answers:

AfilCa [17]3 years ago

8 0

Answer:

When the direction of the force is parallel to the displacement of the object

Explanation:

The work done by a force when moving an object is given by:

$W=Fd cos \theta$

where

F is the magnitude of the force

d is the displacement of the object

$\theta$ is the angle between the force's direction and the displacement

From the formula, we see that the work done is maximum when

$cos \theta=1$

which occurs when

$\theta=0^{\circ}$

so, when the force is parallel to the displacement.

ch4aika [34]3 years ago

7 0

The force and the motion at witch the force is driving it have a directly proportional relationship, meaning the have to both go the same way

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Answer:

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Magnitude of impulse = 4.65 kg.m/s

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Explanation:

Mass of the cricket ball, m = 0.155 kg

Initial velocity of the ball, u = 35.0 m/s

final velocity of the ball after hitting the bat, v = 65.0 m/s

Time of contact, t = 2.00 ms = 2.00 × 10⁻³ s

Now,

Magnitude of change in momentum = Final momentum - Initial momentum

Magnitude of change in momentum = ( m × v ) - ( m × u )

Magnitude of change in momentum = ( 0.155 × 65 ) - ( 0.155 × 35 )

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Now, Magnitude of impulse = change in momentum

thus,

Magnitude of impulse = 4.65 kg.m/s

Now,

magnitude of the average force applied by the bat = $\frac{\textup{Impulse}}{\textup{Time}}$

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Magnitude of the average force applied by the bat = 1550 N

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4 years ago

11. A 6.0‐m wire with a mass of 50 g, is under tension. A transverse wave, for which the frequency is 810 Hz, the wavelength is

Irina-Kira [14]

Answer:

Time will be 19 ms so option (a) is correct option

Explanation:

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4 years ago

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Nina [5.8K]

Answer:

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Explanation:

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3 years ago

A block of mass 12.2 kg is sliding at an initial velocity of 3.9 m/s in the positive x-direction. The surface has a coefficient

Studentka2010 [4]

Answer:

Explanation:

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3 years ago