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3 years ago

8. A car moving at 35 m/s has 675 joules of KE. What is the mass of the car?

1 answer:

6 0

Kinetic energy is the energy possessed by a body in motion while potential energy is the energy of a body at rest.
Kinetic energy is given by E=1/2MV² where M is the mass of the body while V is the velocity of the body.
To get mass we can use the formula M= 2 Ek/V² (Making M the subject)
hence mass = (2 ×675)÷35²
= 1.102 kg

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<h2>Answer</h2>

The answer to this question is $11.67 s$

<h2>Explanation</h2>

As we know that accelartion is the rate of change of velocity. So, it can be write as

$a = (V_f -V_i) /t$

where

$V_f$ is the final velocity

$V_i$ is the initial velocity

t is the time

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as we konw

$a = 3 ms^{-2}$

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From rest So,

$V_i$ = 0

$V_f = 35 ms^{-1}$

Putting values

$3 = (35 - 0)/t$

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3 years ago

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Answer:

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Explanation:

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3 years ago

Se lanza verticalmente hacia arriba una piedra con una velocidad de 125km/h.

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A 3" diameter germanium wafer that is 0.020" thick at 300K has 1.015 x 10^17 As atoms added to it. What is the resistivity of th

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Answer:

0.546 ohm / μm

Explanation:

Given that :

N = 1.015 * 10^17

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Resistivsity (R) = 1/(1.6*10^-19 * 1.015 * 10^17 * 3900)

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Resistivity of germanium :

R = 1 / 2q * sqrt(Ng) * sqrt(u*h)

R = 1 / 2 * 1.6*10^-19 * sqrt(4.42 x10^22) * sqrt(3900*1900)

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3 years ago

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Answer:

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