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ANEK [815]
1 year ago
12

You push downward on a box at an angle 25° below the horizontal with a force of 750 N. If the box is on a flat horizontal surfac

e for which the coefficient of static friction with the box is 0.8, what is the mass of the heaviest box you will be able to move?
Physics
1 answer:
RoseWind [281]1 year ago
8 0

Answer:

103.44g

Explanation:

R=f/u

=750/0.8

=937.5N

m = 937.5/10cos25

m = 103.44g

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Answer:

  F = - 3.53 10⁵ N

Explanation:

This problem must be solved using the relationship between momentum and the amount of movement.

          I = F t = Δp

To find the time we use that the average speed in the contact is constant (v = 600m / s), let's use the uniform movement ratio

        v = d / t

        t = d / v

Reduce SI system

          m = 26 g ( 1 kg/1000g) = 26 10⁻³ kg

          d = 50 mm ( 1m/ 1000 mm) = 50 10⁻³ m

Let's calculate

         t = 50 10⁻³ / 600

         t = 8.33 10⁻⁵ s

With this value we use the momentum and momentum relationship

        F t = m v - m v₀

As the bullet bounces the speed sign after the crash is negative

       F = m (v-vo) / t

       F = 26 10⁻³ (-500 - 630) / 8.33 10⁻⁵

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The negative sign indicates that the force is exerted against the bullet

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