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3 years ago

PLEASE HELP ME!!

Physics

2 answers:

sweet [91]3 years ago

6 0

NaCI is the answer I did the test

Mademuasel [1]3 years ago

5 0

ionic bonds are those between a metal and a non-metal
NaCl is the only ionic bond

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3 years ago

the star of Africa, a diamond in the royal scepter of the British crown jewels, has mass of 530.2 carats, where 1 carat = 0.20 g

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3 years ago

A particle's position is given by x = 7.00 - 9.00t + 3t2, in which x is in meters and t is in seconds. (a) What is its velocity

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$x(t)=7.00\,\mathrm m-\left(9.00\dfrac{\rm m}{\rm s}\right)t+\left(3\dfrac{\rm m}{\mathrm s^2}\right)t^2$

a. The particle has velocity at time $t$ ,

$\dfrac{\mathrm dx(t)}{\mathrm dt}=-9.00\dfrac{\rm m}{\rm s}+\left(6\dfrac{\rm m}{\mathrm s^2}\right)t$

so that after $t=1\,\mathrm s$ it will have velocity $\boxed{-3.00\dfrac{\rm m}{\rm s}}$ .

b. The sign of the velocity is negative, so it's moving in the negative $x$ direction.

c. Its speed is 3.00 m/s.

d. The particle's velocity changes according to

$\dfrac{\mathrm d^2x(t)}{\mathrm dt^2}=6\dfrac{\rm m}{\mathrm s^2}$

which is positive and indicates the velocity/speed of the particle is increasing.

e. Yes. The velocity is increasing at a constant rate. Solving for $\dfrac{\mathrm dx(t)}{\mathrm dt}=0$ is trivial; this happens when $\boxed{t=1.50\,\mathrm s}$ .

f. No, the velocity is positive for all $t$ beyond 1.50 s.

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3 years ago