It is incorrect, because the identity of the original product has changed. Ca3(OH)2 does not exist! It is no longer calcium hydroxide. To balance an equation, you must manipulate the coefficients, a.k.a. the big numbers that go before reactants or products. Subscripts, the little numbers inside the reactants or products, cannot be changed without completely changing the substance.
Answer:
500 J
Explanation:
Kinetic Energy = (mass x velocity x velocity) ÷ 2
We know that mass = 10 kg and velocity = 10 m/s.
KE = (m × v × v) ÷ 2
KE = (10 kg × 10 m/s × 10 m/s) ÷ 2
KE = 500 J
The kinetic energy of the object is 500 J (joules). Hope this helps, thank you !!
We can calculate his resultant speed.
Resultant speed is:
v^2 = 5^2 + 1,9^2
v = 5,349 m/s
Now we need to find angle between resultant speed and vertical speed.
cos(alpha) = 5/5.349 = 0.9347
alpha = 20,8 degrees
Answer is 20,8 degrees
The answer is D. <span>Open
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