The rate of a reaction increases if:<span>
The temperature is increased.
The concentration of a dissolved reactant is increased.
The pressure of a reacting gas is increased.
Solid reactants are broken into smaller pieces.
A catalyst is used.</span>

8 0

3 years ago

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A 12.0 V battery delivers a 0.40 A current to an electric motor that is connected across the battery terminals. What power is co

zhannawk [14.2K]

Answer:

4.8 watts

Explanation:

power = voltage * current = 12.0 * 0.40 = 4.8 watts

6 0

3 years ago

In a ballistics test, a 28-g bullet pierces a sand bag that is 30 cm thick. If the initial bullet velocity was 55 m/s and it eme

skelet666 [1.2K]

Answer:

Frictional force will be equal to 126.04 N

Explanation:

We have given mass of the bullet m = 28 gram = 0.028 kg

Initial velocity u = 55 m /sec

Width of sand = 30 cm = 0.3 m

So initial kinetic energy $E=\frac{1}{2}mu^2=\frac{1}{2}\times 0.028\times 55^2=42.35j$

Final velocity of the bullet v = 18 m /sec

So final kinetic energy $E=\frac{1}{2}mv^2=\frac{1}{2}\times 0.028\times 18^2=4.536j$

So change in kinetic energy = 42.35 - 4.536 = 37.814 j

From work energy theorem this change in kinetic energy will be equal to work one by frictional force

So $f\times 0.3=37.814$

$f=126.04 N$

4 0

4 years ago