PHYSICS HIGH SCHOOL

The center of gravity is defined as: a. The part of the skeleton composed of the bones of the vertebral column, ribs, and skull b. A plane the passes through the midpoint of the body c. State of an object as a result of forces pushing on it d. Imaginary point through which the resultant force of gravity acts on an object

Answers

Answer 1

Answer:

Answer:

the corect answer it b and c

Explanation:

b. the density of lines shows the strength of the force.

c. the arrows on the lines of force show which way a posative object will move.

youre welcome

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How much heat energy (in megajoules) is needed to convert 7 kilograms of ice at –9°C to water at 0°C?A. 2.48 MJ
B. 2.13 MJ
C. 3.26 MJ
D. 3.09 MJ

Answers

Answer;

A. 2.48 MJ

Explanation;

-Heat energy may be given by the product of specific heat capacity , mass and change in temperature, or the product of heat capacity and change in temperature.

-When a substance is changing from solid state to liquid state then the heat energy is calculate by multiplying the latent heat of fusion of a substance by the mass. Latent heat of fusion of ice =3.34×10⁵J/kg and specific heat capacity of water is 2100 J/kg/K.

Specific heat energy: Q = mcΔT

Latent heat energy: Q = mLf

In this case the heat energy required will be;

Heat required to melt ice and raise its temperature to 0°C:

Q₁ = mLf+mciΔT

Q₁ = (7 kg*3.34×10⁵J/kg) + ((7kg*2100J/kgK*{0°C-(9°C)})

= 2.48 MJ (MEGA JOULES)

1. Energy released from changing the phase of a substance from the liquid phase to solid phase can be calculated by using the specific latent heat of fusion. The heat of fusion of water at 0 degrees Celsius is 334 J/g. Calculation are as follows:

Energy = 7000 grams x 334 J/g

Energy = 2338000 J or 2.38 MJ

Pleaseeee help got this homework tomorrow ; if an object vibrates five times every second it has a frequency of ...?

Answers

Here's a tip: The unit of frequency ... Hertz or Hz ... means "per second". "Five times PER SECOND" is a frequency of 5 Hz.

Calculate surface tension of an enlarged radius of 4cm to 6cm and amount of work necessary for enlargement was 1.5×10^-4 joules

Answers

Answer:

$T=7.5*10^(-5)$

Explanation:

From the question we are told that:

Radius $r=2cm$

Work done $W=1.5×10^-4 joules$

Generally the equation for Work done is mathematically given by

$W=T.dA$

Therefore

$T=(W)/(dr)$

$T=(1.5*10^(-4))/(2)$

$T=7.5*10^(-5)$

A soda bottle is flexible enough that the volume of the bottle can change even without opening it. If you have an empty soda bottle (volume of 2.0 L) at room temperature (25 0C), what will the new volume be if you put it in your freezer (-4.0 0C)?

Answers

Answer: 1.81 L

Explanation:

Let us assume that we are dealing with an ideal or perfect gas. Thus we can use the formula from Charles' law that relates the volume with respect to the temperature of a gas.

Given:

Initial volume (V1) = 2L

Initial temperature (T1) = 25°C = 273 + 25 = 298 K

Final temperature (T2) = -4°C = 273 - 4 = 269 K

Final Volume (V2) = ?

Using Charles' law like we stated above, we have

(V1) / (T1) = (V2) / (T2), making V2 the subject of formula, we have

V2 = (V1 × T2) / T1

V2 = (2L × 269 K) / (298 K)

V2 = 538 L.K / 298 K

V2 = 1.81 L

The equation that relates the temperature of an object to the wavelength of its peak radiation is called _____.the blackbody law
Wien's law
Kepler's law
the spectral law

Answers

The equation that relates the temperature of an object to the wavelength of its peak radiation is called Wien's law. Wien's law states that: the black body radiation curve for different temperatures peaks at a wavelength inversely proportional to the temperature.

Answer:

The correct choice is

Wien's law

Explanation:

According to Wien's law, wavelength of maximum intensity of emission of black body radiation is inversely proportional to absolute temperature (T) of the black body. The formula for the law is given as

$\lambda _(m)\propto (1)/(T)\n$