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Marysya12 [62]
3 years ago
9

3. A 142 g baseball is thrown at a speed of 42.9 m/s. What is the kinetic energy of the baseball at this moment?

Physics
1 answer:
krok68 [10]3 years ago
8 0
Kinetic energy=1/2mv^2
=1/2(142*10^-3)(42.9)^2=130.6=131J
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Explanation:

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A small sphere attached to a light rigid rod rotates about an axis perpendicular to and fixed to the other end of the rod. relat
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3 years ago
Emmett is lifting a box vertically. Which forces are necessary for calculating the total force?
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4 0
3 years ago
I need help in my physics class and show me how it’s done
Korolek [52]

If we have the angle and magnitude of a vector A we can find its Cartesian components using the following formula

A_x = |A|cos(\alpha)\\\\A_y = |A|sin(\alpha)

Where | A | is the magnitude of the vector and \alpha is the angle that it forms with the x axis in the opposite direction to the hands of the clock.

In this problem we know the value of Ax and Ay and we need the angle \alpha.

Vector A is in the 4th quadrant

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A_x = 6\\\\A_y = -6.5

So:

|A| = \sqrt{6^2 + (-6.5)^2}\\\\|A| = 8.846

So:

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Option 4.

4 0
3 years ago
When you jump straight up as high as you can, what is the order of magnitude of the maximum recoil speed that you give to the Ea
Klio2033 [76]

Answer:

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Since initial momentum = final momentum,

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My mass m = 54 kg, M = 5.972 × 10²⁴ kg, v₁ = 6.26 m/s, V₁ = 0, v₂ = 0 and V₂ = ?

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5 0
3 years ago
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