PHYSICS HIGH SCHOOL

An explosion that destroys a massive star is called a A. nebula.
B. supernova.
C. black hole.
D. vacuum.

Answers

Answer 1
Answer: An explosion that destroys a massive star is called a supernova ........the answer is B) supernova

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Some hypothetical alloy is composed of 12.5 wt% of metal A and 87.5 wt% of metal B. If the densities of metals A and B are 4.27 and 6.35 g/cm3, respectively, and their respective atomic weights are 61.4 and 125.7 g/mol, determine whether the crystal structure for this alloy is simple cubic, face-centered cubic, or body-centered cubic. Assume a unit cell edge length of 0.395 nm.
The two factors that determine velocity are....A: speed and direction B: direction and distance C: position and rateD: distance and massplease help which one are these . for science class
I will mark brainliest if you get it right.
A child is holding a cup of hot tea. His mother, a physicist, warns him not to start running with the tea. According to Newton's first law, why should his mother be concerned if the child started running?
1. Two charged objects repel each other whentheir charges are of different signs they have the same number of protonstheir charges are of the same signs they have the same number of electrons2. Batteries typically have two positive terminalstwo negative terminals one positive and one negative terminal no terminals

The earth exerts a force of 500 newtons on an object what is the mass of the object in kg

Answers


 Weight (that's what the 500 N is) = (mass) x (gravity) .

On Earth, gravity = about 9.8 m/s² , so

                                 500 N = (mass) x (9.8 m/s²) .

Divide each side by 9.8 m/s²: 

                                 Mass = (500 N) / (9.8 m/s²)

                                          =    51 kg  (rounded) .
 

If two glasses of water are at the same temperature, the average kinetic energy of the particles of water in each glass is the same. Please select the best answer from the choices provided T F

Answers

Answer: The correct answer is True.

Explanation:

Average kinetic energy of the particles is defined as the average of the kinetic energies of the particles present in a medium. It is the measure of temperature of the medium.

Mathematically,

K=(3)/(2)(RT)/(N_A)

where,

K = kinetic energy

T = Temperature

\text{Kinetic energy}\propto \text{Temperature}

As, kinetic energy of the particles is directly proportional to the temperature. Increase in temperature will result in the increase in the kinetic energy and vice-versa.

We are given, that the temperature of the two glasses are same, so the average kinetic energy of the particles will also remain same.

Hence, the correct answer is True.

The statement ‘If two glasses of water are at the same temperature, the average kinetic energy of the particles of water in each glass is the same’ is true. This is because temperature is directly proportional with the kinetic energy of the molecules. If there is no change in temperature, there would not be kinetic movement of the molecules.

The discovery that one current-carrying wire exerts a force on a second current-carrying wire was made by _________.Coulomb
Oersted
Faraday
Ampere

Answers

This discovery was made by Ampere. He further investigated the discovery made by Oersted. Ampere lead to the realization that two parallel wires that carry current exert a force upon each other. He further discovered that when the currents in two wires are in the same direction they are attracted to each other while when the currents are in the opposite directions they are attracted.

Magma appears to be rising underneath the mid-oceanic ridges.
a. True
b. False

Answers

the answer is true .......

A current carrying wire wrapped around an iron ore is called a

Answers

I'm pretty sure that you're talking about an "electromagnet",
and that you actually meant an iron core .

Frost wedging happens when _____.water ions dissolve rock minerals
water freezes inside a rock, causing it to break
oxygen reacts with the chemicals in rock
rocks break from repeated exposure to the Sun's heat

Answers

Answer: water freezes inside a rock, causing it to break

Weathering is a natural process in which the rocks break into pieces or sediments by the action of wind, water and chemical agents. Frost wedging is a physical weathering process. It occurs in an area where temperature fluctuations occurs due to change in the climatic conditions. This occurs due to rapid heating and cooling. The rocks lying in a cold environment, the water residing in the rocks gets freezed. The water in ice form that is solid form acquire more space than in liquid form, therefore, the developed ice will affect the physical structure of the rock. The formation of ice results in the development of break or crack in the rock typically in the shape of a wedge and thus the phenomena is called as frost wedging.

Hence, frost wedging happens when water freezes inside a rock, causing it to break.

Answer:

Frost wedging happens when water freezes inside of a rock, causing it to break
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Why does the weight of water pulls the central part of the surface down?