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4 years ago

6

An object moving at 38m/s takes 4s to come to a stop. What is the object’s acceleration?

1 answer:

Rudik [331]4 years ago

6 0

- 9.5 m/s^2

use the SUVAT method

0 = 38 + 4a

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Let us assume that the mass of a pitched ball is 0.145 kg.

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$\Delta p=m(v-u)\\\\\Delta p=0.145\times ((-51.5)-47.5)\\\\\Delta p=-14.355\ kg-m/s$

So, the magnitude of the change in momentum of the ball is 14.355 kg-m/s.

Let the the ball remains in contact with the bat for 2.00 ms. The impulse is given by :

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4 years ago

A point source emits electromagnetic energy at a rate of 100 W. The intensity 10 m from the source is

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$I=0.0795\ W/m^2$

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Given that,

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We need to find the intensity at a distance of 10 m from the source. Intensity is equal to the power per unit area. So,

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So, the intensity at a distance of 10 m is $0.0795\ W/m^2$

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3 years ago