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dybincka [34]
3 years ago
13

A ball is dropped from rest from the top of a building. What force is responsible for the downward motion of the ball?

Physics
1 answer:
Vlad1618 [11]3 years ago
7 0

Answer: The force of gravity

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cup of hot chocolate has a spoon in it. How does the heat move from the hot chocolate to the metal spoon handle?
serg [7]

The heat moves from the hot chocolate to the handle of the spoon by a process called thermal conduction.

It is the transfer of heat energy from one object to another when they are in contact with eachother.

Hope this answers your question.

5 0
3 years ago
You hang a heavy ball with a mass of 30 kg from a tungsten rod 2.8 m long by 1.5 mm by 2.6 mm. You measure the stretch of the ro
guajiro [1.7K]

Answer:

Young's modulus (Y) = 3.56×10^11 N/m^2

The speed of sound in tungsten = 6166.4 m/s

Explanation:

Young's modulus (Y) = stress/strain

Stress = force/area

Force = mg = 30×9.8 = 294 N

Area = 1.5 × 2.6 = 3.9 mm^2 = 3.9/10^6 = 3.9×10^-6 m^2

Stress = 294/3.9×10^-6 = 7.54×10^7 N/m^2

Strain = extension/length

Extension = 0.000594 m

Length = 2.8 m

Strain = 0.000594/2.8 = 2.12×10^-4

Y = 7.54×10^7/2.12×10^-4 = 3.56×10^11 N/m^2

Y = h × rho × g

rho = 18.7 g/cm^3 = 18.7 g/cm^3 × 1 kg/1000 g × (100 cm/1 m)^3 = 18,700 kg/m^3

h = 3.56×10^11/(18,700×9.8) = 1.94×10^6 m

From the equations of motion

v^2 = u^2 + 2gh =

Initial speed (u) = 0 m/s

v = sqrt (2×9.8×1.94×10^6)

v = 6166.4 m/s

7 0
3 years ago
Read 2 more answers
Perform the operation of 147.02 / 0.338, and report the result with the proper number of significant figures
Ede4ka [16]

Answer:

434.97041

Explanation:

4 0
2 years ago
Why do we need to learn about median and mode?
siniylev [52]
We need to learn about median and mode because they are both important in statistical data and statistical data is what shows us important information about the world around us.
3 0
3 years ago
Material A has a higher thermal conductivity than Material B. Which material will transfer energy by conduction faster?​
AlladinOne [14]

Answer: a

Explanation:

7 0
2 years ago
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