A balloon contains helium with a mass of 0.00296 g. What is the volume of helium in the balloon? (Note: Helium’s density is 0.00001663 g/cm3.) Volume: 0.00296g/0.00001663g/cm^3 = 177.991581cm^3

178 cm3

Explanation:

We know that density is expresses as mass per unit volume hence

Density= mass/volume

Making volume the subject then

Volume=mass/density

Substituting mass with 0.00296 g and density with 0.00001663 g/cm3 then

Volume=0.00296/0.00001663=177.99158147925 cm3

Rounding off, the volume is approximately 178 cm3

the minimum constant speed at which she can catch the train is 2.7 m/s

given:

acceleration = 0.6

time = 4.5 s

to find:

velocity = ?

formula used:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

solution:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

v = 0 + (0.6 × 4.5)

v = 2.7 m/s

the minimum constant speed at which she can catch the train is 2.7 m/s

report!

explanation:

physics means: "the branch of science concerned with the nature and properties of matter and energy. the subject matter of physics, distinguished from that of chemistry and biology, includes mechanics, heat, light and other radiation, sound, electricity, magnetism, and the structure of atoms."