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3 years ago

Velocity ratio is greater than mechanical advantage in simple machine why ?

1 answer:

5 0

The velocity ratio is always greater than the mechanical advantage because the mechanical advantage is affected by friction but the velocity ratio is no affected, as VR is the ratio of two distances

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A steel ball with mass m is suspended from the ceiling at the bottom end of a light, 17.0-m-long rope. The ball swings back and

iogann1982 [59]

Answer:

1. 18.25 m/s

2. 0 m/s

Explanation:

1.So the centripetal acceleration of the ball at this lowest point must be, taking gravity into account

$a_c = \frac{T - mg}{m} = \frac{3mg - mg}{m} = 2g$

The speed at this point would then be

$v^2 = a_c r = 2gr = 2*9.8*17 = 333.2$

$v = \sqrt{333.2} = 18.25 m/s$

2. Similarly, if T = mg, then the centripetal acceleration must be

$a_c = \frac{T - mg}{m} = \frac{mg - mg}{m} = 0$

As the ball has no centripetal acceleration, its speed must also be 0 as well.

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4 years ago

A parachute on a drag race car opens and changes the velocity of the car from 75 m/s to 45 m/s in 8 seconds. Calculate the avera

nikdorinn [45]

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3 years ago

You are preparing breakfast and slide a plate on the countertop. If the countertop. If the countertop is 1.05 m above the floor

NISA [10]

1- .46s
2. -0.34m

Hope this helps!

5 0

2 years ago

The advantage of using a chain over a belt drive

vitfil [10]

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4 0

4 years ago

Read 2 more answers

Using your best estimates, how many times would you have to slap a 1 kg rotisserie chicken in order to cook it? You can assume t

FromTheMoon [43]

Answer:

n= 16021.03 slaps

Explanation:

Using law of Energy conservation

E_{thermal}= Kinetic energy of hand

⇒ $mc\Delta T= n\frac{1}{2}m_hv_h^2$

m_h= mass of the hand = 0.4 kg

v_h= velocity of the hand = 10 m/s

n= number of slaps

c= 4180 J/Kg °C

m= mass of chicken = 1 kg

Assuming all the energy of hand goes into chicken

Given Ti=0°C and T_f= 170 F= 76.66°C

Now putting the values in above equation to get n

$1\times4180(76.66)= n\frac{1}{2}0.4\times10^2$

n= 16021.03 slaps

8 0

3 years ago

Velocity ratio is greater than mechanical advantage in simple machine why ?​

Velocity ratio is greater than mechanical advantage in simple machine why ?