7) Lenny accidentally drops his matchbox car into a graduated cylinder. The car has a mass of 10 grams and the water level in the cylinder rises from 41 ml to 46 ml. Determine the density of the matchbox car. The formula for density is D =
m
v
.
A) 0.5 g/ml
B) 2 g/ml
C) 15 g/ml
D) 50 g/ml

B) = 2 g/mL

Explanation:

Given data:

Mass of car = 10 g

Volume of water = 41 mL

Volume of water+ car = 46 mL

Density of car = ?

Solution:

Density is equal to the mass of object divided by volume of object.

Formula:

d = m/v

volume of car =  Volume of water+ car - Volume of water

volume of car = 46 mL - 41 mL

volume of car = 5 mL

d = 10 g/ 5 mL

d = 2 g/mL

feral cats are estimated to eat tens of millions of native animals each night in australia

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what do the different brain waves do?

explanation:

brainwaves are produced by synchronised electrical pulses from masses of neurons communicating with each other. brainwaves are detected using sensors placed on the scalp. brainwave speed is measured in hertz (cycles per second) and they are divided into bands delineating slow, moderate, and fast waves.