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gregori [183]
2 years ago
12

How does air resistance affect the velocity of a falling object?

Physics
1 answer:
Rashid [163]2 years ago
4 0
A falling object (directly downward) is slowed down by air resistance. In turn it would take longer to fall.
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Imagine a 10kg block moving with a speed of 20m/s. calculate the kinetic energy of this block
avanturin [10]
E_{c}=\frac{mv^2}{2}=2000J
7 0
3 years ago
Consider an electron with charge −e and mass m orbiting in a circle around a hydrogen nucleus (a single proton) with charge +e.
alexandr1967 [171]

Answer:

v=\sqrt{k\frac{e^2}{m_e r}}, 2.18\cdot 10^6 m/s

Explanation:

The magnitude of the electromagnetic force between the electron and the proton in the nucleus is equal to the centripetal force:

k\frac{(e)(e)}{r^2}=m_e \frac{v^2}{r}

where

k is the Coulomb constant

e is the magnitude of the charge of the electron

e is the magnitude of the charge of the proton in the nucleus

r is the distance between the electron and the nucleus

v is the speed of the electron

m_e is the mass of the electron

Solving for v, we find

v=\sqrt{k\frac{e^2}{m_e r}}

Inside an atom of hydrogen, the distance between the electron and the nucleus is approximately

r=5.3\cdot 10^{-11}m

while the electron mass is

m_e = 9.11\cdot 10^{-31}kg

and the charge is

e=1.6\cdot 10^{-19} C

Substituting into the formula, we find

v=\sqrt{(9\cdot 10^9 m/s) \frac{(1.6\cdot 10^{-19} C)^2}{(9.11\cdot 10^{-31} kg)(5.3\cdot 10^{-11} m)}}=2.18\cdot 10^6 m/s

7 0
3 years ago
An empty rubber balloon has a mass of 12.5 g. The balloon is filled with helium at a density of 0.181 kg/m3. At this density the
Taya2010 [7]

Answer:

  • 5.5 N

Explanation:

mass of balloon (m) = 12.5 g = 0.0125 kg

density of helium = 0.181 kg/m^{3}

radius of the baloon (r) = 0.498 m

density of air = 1.29 kg/m^{3}

acceleration due to gravity (g) = 1.29 m/s^{2}

find the tension in the line

the tension in the line is the sum of all forces acting on the line

Tension =buoyant force  + force by helium + force of weight of rubber

force = mass x acceleration

from density = \frac{mass}{volume} ,  mass = density x volume

  • buoyant force =  density x volume x acceleration

        where density is the density of air for the buoyant force

        buoyant force = 1.29 x (\frac{4]{3} x π x 0.498^{3}) x 9.8 = 6.54 N

  • force by helium =  density x volume x acceleration

        force by helium =  0.181 x (\frac{4]{3} x π x 0.498^{3}) x 9.8 = 0.917 N

  • force of its weight = mass of rubber x acceleration

        force of its weight = 0.0125 x 9.8 = 0.1225 N

  • Tension = buoyant force  + force by helium + force of weight of rubber

         the force  of weight of rubber and of helium act downwards, so they      

          carry a negative sign.

  • Tension = 6.54 - 0.917 - 0.1225 = 5.5 N
8 0
2 years ago
Which response is the least effective when confronted with trying drugs or alcohol? "I'd rather be in control of what I do."
SVEN [57.7K]

Answer:

The least effective answer would be "It's okay to lose control every once in a while."

Explanation:

This answer would make it seem like you are either already on drugs or you are willing to try them, which i assume in this case, you are not.

6 0
3 years ago
The lowest point in Death Valley is 75.5 m below the sea level. The summit of nearby Mt. Whitney has an elevation of 4360 m. Wha
sineoko [7]

Answer:2738.477 kJ

Explanation:

Given

Lowest Point of death valley is 75.5 m below sea level

Height of Mt. Whitney is 4360 m

mass of hiker =63 kg

Change in potential energy=m\times g\times (h_2-h_1)

Considering sea level a datum

\delta PE=63\times 9.8\times (4360-(-75.5))=2738477.7 J

\delta PE=2738.477 kJ

8 0
2 years ago
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