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3 years ago

6

a wheelbarrow contains two simple machines - a lever and a wheel and ax. for a certain wheelbarrow, the lever has an efficiency

of 72%, and the wheel and axle has an efficiency of 64%. what is the overall efficiency of the wheelbarrow?

1 answer:

worty [1.4K]3 years ago

5 0

72% + 64%= 136/2 = 68% efficiency

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3 years ago

object carries a charge of -8.1 ÂµC, while another carries a charge of -2.0 ÂµC. How many electrons must be transferred from the

LenKa [72]

Number of electrons transferred: $1.91\cdot 10^{13}$

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The charge on the first object is

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When they are in contact, the final charge on each object will be

$Q=\frac{Q_1+Q_2}{2}=\frac{-8.1+(-2.0)}{2}=-5.05 \mu C$

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

Therefore, the number of electrons transferred is

$N=\frac{Q}{e}=\frac{-3.05\cdot 10^{-6}}{-1.6\cdot 10^{-19}}=1.91\cdot 10^{13}$

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3 years ago

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Explanation:

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Why are power cords coated with a material that has different physical properties than the wire inside?

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3 years ago

A car is stopped at a red light. When the light turns green, the car accelerates until it reaches a final velocity of 45 m/s. It

tigry1 [53]

Answer:

270 m

Explanation:

We can find the distance travelled by the car by using the following suvat equation:

$s=(\frac{u+v}{2})t$

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s is the distance travelled

u is the initial velocity

v is the final velocity

t is the time

For the car in this problem,

u = 0

v = 45 m/s

t = 12 s

Substituting into the equation, we find:

$s=(\frac{0+45}{2})(12)=270 m$

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3 years ago