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3 years ago

An object beginning with a negative velocity but undergoing a positive acceleration

Physics

1 answer:

RSB [31]3 years ago

5 0

The object’s velocity becomes less negative, then becomes zero, and finally becomes positive.

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3 years ago

Please help! Find the time. 8 POINTS!!

Fantom [35]

Answer:

Time = 4.1 s

Explanation:

Momentum = mv = (12000)(4.25) = 51000 kg m/s

Momentum = Impulse (mv = ft) so

51000 = (9200)t

t = (51000)/(9200) = 5.54 seconds

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3 years ago

A child's top is held in place upright on a frictionless surface. The axle has a radius of ????=3.21 mm . Two strings are wrappe

tekilochka [14]

Answer:

Angular momentum, $L=6.47\times 10^{-3}\ m$

Explanation:

It is given that,

Radius of the axle, $r=3.21\ mm=3.21\times 10^{-3}\ m$

Tension acting on the top, T = 3.15 N

Time taken by the string to unwind, t = 0.32 s

We know that the rate of change of angular momentum is equal to the torque acting on the torque. The relation is given by :

$\tau=\dfrac{dL}{dt}$

Torque acting on the top is given by :

$\tau=F\times r$

Here, F is the tension acting on it. Torque acting on the top is given by :

$\tau=2F\times r$

$2T\times r=\dfrac{L}{t}$

$L=2T\times r \times t$

$L=2\times 3.15\times 3.21\times 10^{-3}\times 0.32$

$L=6.47\times 10^{-3}\ m$

So, the angular momentum acquired by the top is $6.47\times 10^{-3}\ m$ . Hence, this is the required solution.

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3 years ago

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