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3 years ago

13

Cantaloupe provides the highest level of Vitamin A and when consumed is 10 calories. Which fruit combined with cantaloupe will o

ffer the highest level of Vitamin C and allow for less than 30 total calories consumed?

1 answer:

astra-53 [7]3 years ago

8 0

<span>plums, they contain antioxidants and a lot of vitamin C and they're only 30 cals,</span>

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3 years ago

What potential difference is needed to accelerate a he+ ion (charge +e, mass 4u) from rest to a speed of 1.5×106 m/s ? e?

Nataly_w [17]

We can solve the problem by using conservation of energy.

In fact, the electric potential energy lost by the charge when moving through the potential difference is equal to the kinetic energy acquired:

$\Delta U=\Delta K =K_f -K_i =K_f$

where $K_f$ is the final kinetic energy, and $K_i$ is the initial kinetic energy, which is zero since the particle starts from rest.

We can rewrite the equation above as:

$q \Delta V=\frac{1}{2}mv^2$

where

$q=e=1.6 \cdot 10^{-19}C$ is the charge of the ion

$\Delta V$ is the potential difference

$m=4u=4 (1.67 \cdot 10^{-27} kg)=6.7 \cdot 10^{-27} kg$ is the mass of the ion

$v=1.5 \cdot 10^6 m/s$ is the final speed of the ion

Substituting the numbers and rearranging the equation, we can find the potential difference needed:

$\Delta V=\frac{mv^2}{2q}=\frac{(6.7 \cdot 10^{-27}kg)(1.5 \cdot 10^6 m/s)^2}{2(1.6 \cdot 10^{-19}C)}=4.7 \cdot 10^4 V=47 kV$

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3 years ago