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NikAS [45]
3 years ago
7

Why do you think the velocity of the center of mass does not change

Physics
1 answer:
Vera_Pavlovna [14]3 years ago
3 0

Answer:

becuase the center of the velocity system wont change

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Hey help me and thanks in advance if you do​
blsea [12.9K]

P = W / t

2000 = 30000 / t

t = 30000/2000

t = 30/2

t = 15 seconds

3 0
3 years ago
Read 2 more answers
A supply plane needs to drop a package of food to scientists working on a glacier in Greenland. The plane flies 110 m above the
zysi [14]

Answer:

The distance is 709.5 m.

Explanation:

Given that,

Speed = 150 m/s

Distance = 110 m

Suppose, How far short of the target should it drop the package?

We need to calculate the time

Using equation of motion

s=ut+\dfrac{1}{2}gt^2

t^2=\dfrac{2s}{g}

Where, g = acceleration due to gravity

t = time

Put the value into the formula

t=\sqrt{\dfrac{2\times110}{9.8}}

t=4.73\ sec

We need to calculate the distance

Using formula of distance

d= vt

Put the value into the formula

d=150\times4.73

d=709.5\ m

Hence, The distance is 709.5 m.

8 0
3 years ago
A 2.0-g piece of Mg reacts with HNO3. Which conditions would produce the GREATEST reaction rate
amid [387]

Answer:

1.0 M HNO3 at 40<em>°C</em>

Explanation:

Rate of chemical reaction: This can be defined as the number of moles of reactant, converted or product formed per unit time.

Factors that affect rate of chemical reaction:

(a) Temperature:  Generally, an increase in temperature increase the rate of chemical reaction by (1) increasing the number of particles with energy equal to or greater than the activation energy, (2) Increasing the average speed of all the reactant particles, due to greater kinetic energy, leading to higher frequency of collision.

(b) Concentration: An increase or decrease in the concentration of the reactant will  result to a corresponding increase or decrease in the effective collision of the reactant and hence in the reaction rate.

other factors that affect the rate of chemical reaction are

(i) Nature of the reactant

(ii) Surface area of reactant

(iii) presence of light

(iv) presence of catalyst.

From the question above,

<em>The condition with the highest temperature and concentration will produce the GREATEST reaction rate.</em>

<em>And that is  1.0 M HNO3 at 40 °C</em>

4 0
3 years ago
The acceleration of a vertically thrown ball at the top of its path is?
ser-zykov [4K]
C between zero and g
5 0
3 years ago
Question 3 (1 point)<br> The nucleus occupies most of the space of an atom<br> True<br> O False
Marizza181 [45]

Answer:

the correct answer is false

5 0
3 years ago
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