Which of the following quantities for an object should be known to calculate its density? The space it occupies The heat present in it The force of gravity acting on the object How long it takes for an object to travel a certain distance


Answer 1
Answer: Density = mass / volume
therefore, both mass and volume are needed
the first one represents volume
The Space it occupies is the answer
Answer 2


well my fellow human the answer to the question is The Space it occupies is the answer


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HHHHHHEEEEELLLLLPPPP!!!!! For the following series circuit, compute the power in R1, R2, and R3 if the circuit values are E = 24 volts, R1 = 8, R2= 12, and R3 = 28.

Power in R1 = ____ watts

Power in R2 = _____ watts

Power in R3 = _____ watts

Compute the total power delivered to the circuit by the 24-volt battery: _____ watts



Power in R1 = 2 watts

Power in R2 = 3 watts

Power in R3 = 7 watts

Compute the total power delivered to the circuit by the 24-volt battery:  12 watts

Power = potential difference across resistance * current
P= i^2 * R
i = E/ equivalent resistance

Since all resistance are in series

Equivalent resistance = 8+12+28= 48

i = 24/48
i= 0.5

Power in R1= 0.5*0.5*8
= 2 watt

Power in R2= 0.5*0.5*12
= 3 watt

Power in R3= 0.5*0.5*28
= 7 watt

Engineers can determine properties of a structure that is modeled as a damped spring oscillator, such as a bridge, by applying a driving force to it. A weakly damped spring oscillator of mass 0.246
kg is driven by a sinusoidal force at the oscillator's resonance frequency of
Hz. Find the value of the spring constant.
The amplitude of the driving force is
N and the amplitude of the oscillator's steady‑state motion in response to this driving force is
m. What is the oscillator's damping constant?


The value of spring constant and the oscillator's damping constant is

K= 6605.667008, b= 0.002884387


For Weakly damping spring oscillator

K/m = W_0^2     (at resonance)

K= mW_0^2

=0.206 * ( 2π * 28.5) ^2

=0.206 * (2π)^2 * (28.5)^2

K= 6605.667008

F = - bV

b= -F/V = -F/ -W_0 * m

=F/W_0 * m

= 0.438N / 2π * 28.5 * 0.848

b= 0.002884387


There is an elephant shaped weather vane at the top of a corn dryer tower that is 45 m high. If the weather vane weighs 140 N, what is the Potential Energy that the weather vane has?


The potential energy will be "6300 J".

According to the question,

  • Weight, w = 140 N
  • Height or tower, h = 45 m

The mass will be:


By putting the values, we get




The potential energy will be:



Thus the above response is right.

Learn more about P.E here:


Ep = 6300 [J]


If the ground level is taken as the reference energy point, that is, as the point at which the potential energy is equal to zero. We can calculate the energy potential maxima to the height where the weather vane is located.

The mass can be calculated as follows:

w = m*g

m = w /g

m = 140 / 9.81

m = 14.27[kg]

Now calculating the potential energy


In an experiment to measure the wavelength of light using adouble slit, it is found that the fringes are too close together toeasily count them. To spread out the fringe pattern, one could:A. decrease the slit separationB. increase the slit separationC. neither of these will spread out the pattern



A. decrease the slit separation


Double slit experiment was done to study the phenomenon of interference of light. It gives a definitive proof of wave nature of light.

In the double slit experiment

the distance between the fringes in the interference pattern is given by

D= distance between the slit and the screen

d= distance between the slits

λ= wavelength

therefore, and increase in Δy may decrease d that is

:A. decrease the slit separation


When a spring is compressed 2.50 × 10^–2 meter from its equilibrium position, the total potential
energy stored in the spring is 1.25 × 10^–2 joule.
Calculate the spring constant of the spring.
[Show all work, including the equation and
substitution with units.]


     The working of a spring is given by:

     Entering the unknowns, we have:

If you notice any mistake in my english, please let me know, because i am not native.

During a total lunar eclipse, the Earth, Sun, and Moon are arranged in a line, and light from the Sun is blocked out of view for a certain part of the Earth by the Moon. In what order do the Earth, Sun, and Moon line up? A. Earth, Moon, Sun B. Sun, Earth, Moon C. Earth, Sun, Moon D. Moon, Sun, Earth



It is sun earth moom!


During a lunar eclipse, the Earth, Sun, and Moon line up in the order:

Sun, Earth, Moon

Since the Earth is between the Sun and the Moon during the lunar eclipse, the Moon is in the Earth's shadow. This makes the Moon look completely dark because none of the Sun's light strikes the Moon.

A. Earth, Moon, Sun , because the earth is in front of the moon and the moonis in front of the sun blocking it a little bit.


In which of the following will substances move from areas of lower concentration to areas of higher concentrations? a. Osmosis
b. Facilitated diffusion
c. Diffusion
d. Active transport


The question says,' in which of the following will substances move from areas of lower concentration to areas of higher concebtration. The correct option is D. Active transport is the movement of molecules across a cell membrane into a region of higher concentration. This process require energy and is usually catalysed by enzymes.
D. Active transport
Hope it helps :D

A toaster oven is plugged into an outlet that provides a voltage difference of 120 v. Wha power does the oven use if the current is 10 A ?



Power of oven, P = 1200 watts


It is given that,

Voltage difference of a toaster oven, V = 120 Volts

Current flowing in the oven, I = 10 A

The relation between the potential difference, current and the power is given by:

P = 1200 Watts

So, the power used by the oven is 1200 Watts. Hence, this is the required solution.  


P= (120V) (10A)

P= 1,200 W


To which types of thermodynamic processes will the relation Tds =đQ apply? What is the correct term for the symbol T in this expression, and what exactly does dQ represent? (5) (b) Calculate the change in entropy when tkg of ice is melted at 273.16K Calculate the change in entropy when lkg of water is heated from 273 16K to 300K (15) (c) Why is the change in entropy much larger for one of the calculations in part (b) of this question



a) Reversible processes

b) 1222.73 J/K and 392.144 J/K

c) Because of breaking bonds that are a stable state, while accelerating molecules in the other is less difficult.


Since it is equality, it should be applied to reversible processes, and even better to isothermal processes, since the Temperature remains constant. The T is the absolute temperature (measured in °K) and dQ is the heat absorbed by the system, which DEPENDS on the process.

b) The heat absorbed in the fusion process depends on the latent heat of fusion, L, of the water, which is 334 J/g. It says t kg, but I assume it was a mistake in the typing, so the change in entropy is calculated for 1 kg of water melting as follows:

Now, to proceed with the change of entropy for water heated from 273.16K to 300K we use the specific heat of water, which is 4184 J/kg°K as follows:

c) In the solid state, water molecules have different bonds with other water molecules creating the crystals. In the liquid state, each molecule moves freely with less interaction between molecules. So, it required more energy to break these bonds and alter this ordered state than just accelerating the molecules in the liquid state.

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