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3 years ago

9

Who was the first head of the NASA space program was Sergei Korolov, but the Russians never identified him by name. What did the

y call him in public?

1 answer:

larisa86 [58]3 years ago

6 0

Korolev's name became known in the West. I hope this helps.

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How do scientists study pollen grains to help them understand climate change?

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Answer: A. by analyzing and making inferences about them

Explanation:

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The movement of water into the atmosphere as it changes from a liquid to a gas is called _____.

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Evaporation . Because it drys up and turns into gas

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A lithium atom has three protons, three neutrons, and three electrons. What is the overall charge on this atom?

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Answer:

0

Explanation:

The overall charge on this atom is 0.

To find the charge on an atom;

charge = number of protons - number of electrons.

Note:

Protons are the positively charged particles in an atom
Electrons are the negatively charged particles in an atom
Neutrons carries no charges on them.

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If the number of electrons is more, the atom will be negatively charge but if the number of protons is more, it will be positively charged.

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Two 0.20-kg balls, moving at 4 m/s east, strike a wall. Ball A bounces backwards at the same speed. Ball B stops. Which statemen

muminat

Answer:

Option A

Explanation:

From the question we are told that:

Mass $m=0.20kg$

Velocity $v=4m/s$

Generally the equation for momentum for Ball A is mathematically given by

Initial Momentum

$M_{a1}=mV$

$M_{a1}=0.2*4$

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Final Momentum

$M_{a2}=-0.8kgm/s$

Therefore

$\triangle M_a=-1.6kgm/s$

Generally the equation for momentum for Ball B is mathematically given by

Initial Momentum

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$M_{b1}=0.8$

Final Momentum

$M_{b2}=-0 kgm/s$

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$|\triangle M_a|>|\triangle Mb|$

Option A

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3 years ago

If a cart is accelerating downhill under a net force of 25 N, what additional force would cause the cart to have a constant velo

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No additional force is required because it's already going downhill

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