A sample of a substance has a mass of 7.5 g and a volume of 2.5 cubic centimeters. What is the object’s density? A.) 3 grams per cubic centimeter
B.) 10 grams per cubic centimeter
C.) 0.3 grams per cubic centimeter
D.) 20.44 grams per cubic centimeter

option A is the correct answer .

Explanation:

as density = mass per unit volume

density = 7.5/2.5 = 3 gm / cm³ ..is the answer ...

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A) d = 3 g/cm³

Explanation:

Given data:

Mass of substance = 7.5 g

Volume of substance = 2.5 cm³

Density of object = ?

Solution:

Formula:

d = m/v

d = density

m = mass

v = volume

by putting values,

d = 7.5 g/ 2.5cm³

d = 3 g/cm³

it is a good conductor

explanation:

a: 45.9 meters

b: 4.29 seconds

step-by-step explanation:

a: h(t)=1/2(-9.8)(3)^2+0(3)+90

h(t)=-4.9(3)^2+90

h(t)=-44.1+90

h(t)=45.9 meters

b: 0=1/2(-9.8)(t^2)+0t+90

0=-4.9t^2+90

-90=-4.9t^2

18.37=t^2

t=4.29 seconds

in the second question, the numbers aren't exact, but they're a close approximation.