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2 years ago

Which determines the reactivity of an alkali metal?

Physics

1 answer:

shutvik [7]2 years ago

8 0

Answer:

Explanation:

I'm pretty sure it's A because when you look up the properties of alkali metal it states stuff about its melting points and what to expect. (correct me if I'm wrong but I had this same question on a test and I'm sure this is the answer lol)

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Which of the following statements are TRUE about nuclear energy?

san4es73 [151]

Answer:

Explanation:

4 0

2 years ago

What factors affect water quality?

JulsSmile [24]

Answer:

Explained below:

Explanation:

Water quality is determined in terms of the physical, chemical and biological content of water. The quality of water of lakes and rivers variates with the seasons and also geographic areas, still in the absence of pollution. There are so many factors which affect water quality are as follows :

Pesticides

Temperature

Runoff

Sedimentation

Erosion

Dissolved oxygen

Pesticides

Litter and rubbish

Decayed organic materials

Toxic and hazardous substances

Oils, grease, and other chemicals

3 0

3 years ago

A ball is launched with initial speed v from ground level up a frictionless slope (This means the ball slides up the slope witho

amid [387]

Answer:

hmax = 1/2 · v²/g

Explanation:

Hi there!

Due to the conservation of energy and since there is no dissipative force (like friction) all the kinetic energy (KE) of the ball has to be converted into gravitational potential energy (PE) when the ball comes to stop.

KE = PE

Where KE is the initial kinetic energy and PE is the final potential energy.

The kinetic energy of the ball is calculated as follows:

KE = 1/2 · m · v²

Where:

m = mass of the ball

v = velocity.

The potential energy is calculated as follows:

PE = m · g · h

Where:

m = mass of the ball.

g = acceleration due to gravity (known value: 9.81 m/s²).

h = height.

At the maximum height, the potential energy is equal to the initial kinetic energy because the energy is conserved, i.e, all the kinetic energy was converted into potential energy (there was no energy dissipation as heat because there was no friction). Then:

PE = KE

m · g · hmax = 1/2 · m · v²

Solving for hmax:

hmax = 1/2 · v² / g

4 0

3 years ago

What can cause an increase in density that results in a deep ocean current

mrs_skeptik [129]

The movement of plates

5 0

2 years ago

Read 2 more answers

Provide the following information for each of the three types of radiations from naturally radioactive materials. Be sure to inc

scoundrel [369]

Alpha radiation: Particles. Each alpha particle is a little bundle of 2 protons and 2 neutrons ... identical to the nucleus of a Helium atom.

Charge . . . +2 elementary charges

Mass . . . 4 Atomic Mass Units

Relative penetrating power . . . low

The effect an electric field would have on it . . . Since the alpha particle has a positive charge, it's repelled by other positive charges, and attracted toward negative charges.

Beta radiation: Particles. Each beta particle is an electron.

Charge . . . -1 elementary charge

Mass . . . 0.00055 AMU

Relative penetrating power . . . medium

The effect an electric field would have on it . . . repelled by other negative charges, and attracted toward positive charges.

Gamma radiation: electromagnetic wave, verrrrry short wave, high frequency

Charge . . . electromagnetic wave, no charge

Mass . . . electromagnetic wave, no mass

Relative penetrating power . . . high

The effect an electric field would have on it . . . electromagnetic wave, no effect

5 0

3 years ago