3 years ago

if a ball on a string swung in a circles and string suddenly breaks.the ball will move into what direction?

Physics

1 answer:

Akimi4 [234]3 years ago

3 0

Answer: b

Explanation: did the quiz got it right

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It's still 20 kg. Mass doesn't change according to gravity, only weight changes.

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When a body of mass 0.25 kg is attached to a vertical massless spring, it is extended 5.0 cm from its unstretched length of 4.0

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$d=0.165m$

Explanation:

Given

$m=0.25kg$ , $x_{1}=5cm*\frac{1m}{100cm}=0.05m$ , $x_{2}=4cm*\frac{1m}{100cm}=0.04m$ , $v=2\frac{rev}{s}$

The tension of the spring is

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The force in the spring is equal to centripetal force so

$F_{c}=\frac{m*v^2}{r}$

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But Fc is also

Fc=KxΔr

$F_{c}=K*(r-x_{2})$

Replacing

$m*4\pi^2*r=K*(r-x_{2})$

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3 years ago

A boy weighs 40 kilograms. He runs at a velocity of 4 meters per second north. Which is his momentum?

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The boy's momentum is 160 kg*m/s north.

The formula of momentum is p = mv, where p is momentum.
p = 40 kg * 4m/s north
p =160 kg*m/s north

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