3 years ago

An iron rod is :

1 answer:

7 0

The answer is C because the three metals that are magnetic are iron, nickel, and cobalt, and it is metal so it is a conductor of electricity.

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Rama09 [41]

Answer:

Vector has a direction and a magnitude, scalar only has a magnitude

Explanation:

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3 years ago

Margarita [4]

D) a car speeding up may i have brainliest hope this help

7 0

3 years ago

REY [17]

I am not entirely sure but i believe the answer is C scupture

3 0

3 years ago

Lerok [7]

After they have gathered enough information by testing the theory.

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2 years ago

KATRIN_1 [288]

Explanation:

It is given that, the position of a particle as as function of time t is given by :

$r(t)=(8t+9)i+(2t^2-8)j+6tk$

Let v is the velocity of the particle. Velocity of an object is given by :

$v=\dfrac{dr(t)}{dt}$

$v=\dfrac{d[(8t+9)i+(2t^2-8)j+6tk]}{dt}$

$v=(8i+4tj+6k)\ m/s$

So, the above equation is the velocity vector.

Let a is the acceleration of the particle. Acceleration of an object is given by :

$a=\dfrac{dv(t)}{dt}$

$a=\dfrac{d[8i+4tj+6k]}{dt}$

$a=(4j)\ m/s^2$

At t = 0, $v=(8i+0+6k)\ m/s$

$v(t)=\sqrt{8^2+6^2} =10\ m/s$

Hence, this is the required solution.

7 0

3 years ago