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kogti [31]
2 years ago
7

A pesticide was applied to a population of roaches, and it was determined that the LD50 was 55mgkg. If the average mass of a roa

ch was 0.02kg, which of the following approaches will determine the dose in mg per roach?
Physics
1 answer:
zhannawk [14.2K]2 years ago
0 0

Answer:

55mg/kg * 0.02kg which gives 1.1 mg pesticides

Explanation:

(Options are missing)

If the average mass or weight of a roach is 0.02kg

And 55mg is needed per 1 kg roaches

The amount or size of pesticide required for 0.02kg roach is 55mg/kg * 0.02kg

Size = 55mg/kg * 0.02 kg

Size = 1.1mgkg/kg

Size = 1.1 mg

So, the size of pesticide required is 1.1mg

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anygoal [31]

Answer:

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(c) 0.11 watt

Explanation:

mass, m = 0.3 kg

spring constant, K = 160 N/m

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initial speed, u = 3 m/s

(a) Let the maximum stretch is y.

Use conservation of energy

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Initial potential energy + initial kinetic energy = final kinetic energy

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T=2\pi\sqrt{\frac{m}{K}}

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