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4 years ago

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It usually takes more force to start an object sliding than it does to keep an object sliding because static friction is usually

_____greater _______________ than sliding friction.

1 answer:

labwork [276]4 years ago

5 0

The answer is already in the blank for, its was greater

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A violin string is 45.0 cm long and has a mass of 0.242 g. When tightened on the neck of the violin, the distance between the pi

stiks02 [169]

Answer:

The tension is 75.22 Newtons

Explanation:

The velocity of a wave on a rope is:

$v=\sqrt{\frac{TL}{M}}$ (1)

With T the tension, L the length of the string and M its mass.

Another more general expression for the velocity of a wave is the product of the wavelength (λ) and the frequency (f) of the wave:

$v= \lambda f$ (2)

We can equate expression (1) and (2):

$\sqrt{\frac{TL}{M}}$ = $\lambda f$

Solving for T

$T= \frac{M(\lambda f)^2}{L}$ (3)

For this expression we already know M, f, and L. And indirectly we already know λ too. On a string fixed at its extremes we have standing waves ant the equation of the wavelength in function the number of the harmonic $N_{harmonic}$ is:

$\lambda_{harmonic}=\frac{2l}{N_{harmonic}}$

It's is important to note that in our case L the length of the string is different from l the distance between the pin and fret to produce a Concert A, so for the first harmonic:

$\lambda_{1}=\frac{2(0.425m)}{1}=0.85 m$

We can now find T on (3) using all the values we have:

$T= \frac{2.42\times10^{-3}(0.85* 440)^2}{0.45}$

$T=75.22 N$

3 0

4 years ago

A soccer player attempting to steal the ball from an opponent was extending her knee at 50 deg/s when her foot struck the oppone

denpristay [2]

Answer:

$\alpha = -4.36 rad/s^2$

Explanation:

Initial angular speed of the player is given as

$\omega = 50 deg/s$

here we know that

$1 deg = \frac{\pi}{180} rad$

now we know that

$\omega = 50\frac{\pi}{180}$

$\omega = 0.87 rad/s$

now its speed comes to zero in 0.2 s

so angular acceleration is given as

$\alpha = \frac{\omega_f - \omega_i}{\Delta t}$

$\alpha = \frac{0 - 0.87 rad/s}{0.2 s}$

$\alpha = -4.36 rad/s^2$

7 0

4 years ago

David delivers meals to elderly people once a week. He uses a cart to move the meals. The cart has four smooth wheels. Which typ

Naya [18.7K]

Answer: rolling friction

Explanation: I think it is the answer

3 0

3 years ago

Please answer :( gravity question for science

andreev551 [17]

The two forces acting on your body are the weight and the normal force

Explanation:

As you sit on your chair in front of the computer, there are 2 forces acting on you:

The force of gravity, of magnitude $mg$ (where m is your mass and $g=9.8 m/s^2$ is the acceleration of gravity), acting downward
The normal reaction exerted by the chair on your body, N, acting upward, and balancing your weight

We can apply Newton's second law to this situation; the law states that the net force acting on an object is equal to the product between the mass of the object and its acceleration:

$\sum F = ma$

where

$\sum F$ is the net force

m is the mass

a is the acceleration

For your body sitting on the chair,

$\sum F = N-mg$

we also know that your body is at rest, so the acceleration is zero:

$a=0$

This means that the net force is zero, and therefore:

$\sum F = 0 =N-mg\\\rightarrow N = mg$

Learn more about Newton's second law of motion:

brainly.com/question/3820012

#LearnwithBrainly

8 0

3 years ago

What is the advantage of having two eyes instead of one eye in humans?

Naily [24]

Answer:

2,

Explanation:

Because one eye can see small area, having two will give your eyesight a bigger AoE (wider area)

4 0

2 years ago