PHYSICS HIGH SCHOOL

work of 4 joules is done in stretching a spring from its natural length to 11 cm beyond its natural length. what is the force (in newtons) that holds the spring stretched at the same distance (11 cm)

Answers

Answer 1
Answer:

The work performed on the spring is

W = 1/2 k x²

so that

4 J = 1/2 k (0.11 m)²   ⇒   k ≈ 660 N/m

Then by Hooke's law, the force required to hold the spring in this position is

F = k x = (660 N/m) (0.11 m) ≈ 73 N

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Which of the following is not a possible effect of rising carbon dioxide levels on plants?

Answers

Hi:)

I think those were the options for your question, tell me if I'm wrong!
increased photosynthesis (this is false, plants need carbon dioxide for photosynthesis), increased plant mortality (this is the correct answer!!!!!)  increased crop productivity (this is also false, it is connected to photosynthesis) and increased plant growth (also false)

Increased plant mortality ( option B ) Is the correct answer on edg. I just took the test. :)))

Suggest one reason why the experiment might not have given a correct value forthe specific heat capacity of the metal.

Answers

Answer:

It is because some of the heat is lost in the surroundings.

Explanation:

To calculate the specific heat of the metal, the following steps are performed.

Take a piece of metal whose mass and the initial temperature is known.

Now take a beaker filled with some measured amount of water and the temperature of water is known.

Drop the heated metal piece in the water so that the equilibrium is reached.

According to the principle of calorimetery,

Heat lost by the metal = heat gained by the water

here, some of the heat is lost in the surroundings so we don't get the correct value of the specific heta of the metal.

Why do you think sound travels faster in steel than it does in wood? (Hint: Think about the densities of the two materials, and how the particles might be arranged.)

Answers

Answer:

If sound waves of the same energy were passed through a block of wood and a block of steel, which is more dense than the wood, the molecules of the steel would vibrate at a slower rate. Sound moves faster through denser air because the molecules are closer together in dense air and sound can be more easily passed on.

Explanation:

A gas has an initial volume of 168 cm3 at a temperature of 255 K and a pressure of 1.6 atm. The pressure of the gas decreases to 1.3 atm, and the temperature of the gas increases to 285 K.What is the final volume of the gas?

Answers

P1V1/T1 = P2V2/T2

(1.6atm)(168cm^3)/(255K) = (1.3atm)V2/(285K)

Final volume = 231cm^3

Answer:

D). 231 cm3 is your answer

Explanation:

a stone falls from a ledge and takes 8 seconds to hit the ground. The stone has an original velocity of 0 m/s. How tall is the ledge

Answers

The height of a falling object, h, in terms of the seconds passed, t, is
h = 0.5(-9.8t^2) + v_0t + h_0
0 = -4.9(8)^2 + 0 + h_0
h_0 = 64 * 4.9
= 313.6 meters

Here's a formula that tells the distance covered by an
accelerating object starting from rest.  The formula is
very useful, and it's simple enough to memorize:

       Distance = (1/2) (acceleration) (time squared) .

If the object is falling, then the acceleration is gravity, 9.8 m/s²,
and the distance is

                         (4.9) (time²) .

In this question,

                     D  =  (4.9) (8²)

                         =  (4.9 x 64)  =  313.6 meters.

Coupla comments:

-- This calculation ignores air resistance. 
    We kind of ALWAYS do that, otherwise
    the calculation would be very complicated,
    and would need a lot of other numbers
    that we don't know, like the size and shape
    of the falling object, and the density of the air.

--  This is a very big building ... about 1,029 feet.
     In New York City, the Chrysler building and
     the New York Times building are both only
     15 feet taller than that.
    

Radiative forcing is the amount of change in the thermal energy units (watts/square meter on the earth's surface) caused by a given factor. True or False?

Answers

Answer:

True

Explanation:

Radiative forcing is indeed the measure of the change in thermal energy units (watts per square meter) at the Earth's surface or in the atmosphere caused by a particular factor, such as an increase in greenhouse gases or aerosols. It quantifies the impact of various factors on the Earth's energy balance and is an important concept in climate science for understanding the drivers of climate change.
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