The net force performs a total amount of work equal to
(45 N) (0.80 m) = 36 J
on the bullet, and this is in turn is equal to the change in the bullet's kinetic energy by the work-energy theorem. So we have
W = ∆K = 1/2 mv²
since the bullet starts at rest, where m = its mass and v = its final velocity.
Solve for v :
36 J = 1/2 (0.0050 kg) v² ⇒ v = 120 m/s
Answer:Kinetic energy of the girl and her bike is 5.544 kJ
Explanation:
Given that a girl is riding bike at speed of 12m/s
Also, mass of Girl is 55kg and mass of bike is 22kg
Let, Total mass of girl and bike be M=22+55=77kg
Now, Kinetic energy is given by K=
Hence, Kinetic energy of the girl and her bike will be
K=
K=
K=5544J
Thus, Kinetic energy of the girl and her bike is 5.544 kJ
Answer:
The baking soda and citric acid mixture is common in commercial cold packs. However, once the reaction is complete, the cold pack is done. Another non-toxic chemical that can be used to generate a cold reaction is sodium acetate. ... Dissolving the crystals in water, on the other hand, is an endothermic (cold) reaction.
Explanation:
<span>Temperature and activation energy
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