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3 years ago

An athlete of mass 70kg runs at a velocity of 6ms5-1 calculate the kinetic energy of the athlete.

Physics

1 answer:

Molodets [167]3 years ago

8 0

KE=1/2 mv²
= 1/2 × 70 × (6)²
= 1260

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4 years ago

Read 2 more answers

A parallel-plate capacitor with plates of area 360 cm2 is charged to a potential difference V and is then disconnected from the

Softa [21]

Answer:

$Q=3.9825\times 10^{-9} C$

Explanation:

We are given that a parallel- plate capacitor is charged to a potential difference V and then disconnected from the voltage source.

1 m =100 cm

Surface area =S= $\frac{360}{10000}=0.036 m^2$

$\Delta d=0.8 cm=0.008 m$

$\Delta V=100 V$

We have to find the charge Q on the positive plates of the capacitor.

V=Initial voltage between plates

d=Initial distance between plates

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Capacitance of capacitor after moving plates

$C_1=\frac{\epsilon_0 S}{(d+\Delta d)}$

$V=\frac{Q}{C}$

Potential difference between plates after moving

$V=\frac{Q}{C_1}$

$V+\Delta V=\frac{Q}{C_1}$

$\frac{Qd}{\epsilon_0S}+100=\frac{Q(d+\Delta d)}{\epsilon_0S}$

$\frac{Q(d+\Delta d)}{\epsilon_0 S}-\frac{Qd}{\epsilon_0S}=100$

$\frac{Q\Delta d}{\epsilon_0 S}=100$

$\epsilon_0=8.85\times 10^{-12}$

$Q=\frac{100\times 8.85\times 10^{-12}\times 0.036}{0.008}$

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4 years ago

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Answer:

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Since, the acceleration of the truck is inversely proportional to the mass, the reduced mass will result in an increased acceleration.

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3 years ago

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3 years ago

An athlete of mass 70kg runs at a velocity of 6ms5-1 calculate the kinetic energy of the athlete.​

An athlete of mass 70kg runs at a velocity of 6ms5-1 calculate the kinetic energy of the athlete.