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OlgaM077 [116]
3 years ago
9

Which statements accurately describe mass? Check all that apply. Mass is a chemical property of an object. Mass is measured usin

g a balance. The mass of an object remains constant. Mass is the same as weight. Kilograms are units of mass.
Physics
2 answers:
Sati [7]3 years ago
8 0
-- Mass can be measured using a balance.
(It's not the only way.)

-- The mass of an object remains constant,
no matter where it is or what it weighs.

-- The "kilogram" is the international standard unit of mass.
A kilogram of mass weighs about 5.8 ounces on the moon,
about 13.3 ounces on Mars, about 2.2 pounds on Earth . . . . .
ivolga24 [154]3 years ago
5 0

Answer:

B, C, E

Explanation:

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A bicyclist of mass 60kg supplies 340W of power while riding into a 5 m/s head wind. The frontal area of the cyclist and bicycle
NikAS [45]

Answer:

87.1 mph

Explanation:

We are given that

Mass,m=60 kg

Power,P=340 W

Speed,v=5 m/s

Area,A=0.344 m^2

Drag coefficient,C_d=0.88

Coefficient of rolling resistance,\mu_r=0.007

Friction force,f=\mu_rmg=0.007\times 60\times 9.8=4.1 N

Where g=9.8 m/s^2

Let speed of cyclist=v'

Drag force,F_d=\frac{1}{2}\rho_{air}AC_dv^2

Density of air,\rho_{air}=1.225 kg/m^3

F_d=\frac{1}{2}\times 1.225\times 0.344\times 0.88(5)^2=4.635N

Power,P=(F_d+f)\times v'

340=(4.1+4.635) v'=8.735v'

v'=\frac{340}{8.735}=38.9m/s

v'=87.1 mph

1 m=0.00062137 miles

1 hour=3600 s

7 0
3 years ago
A star with a mass like the Sun which will soon die is observed to be surrounded by a large amount of dust and gas -- all materi
Dafna11 [192]

Answer: D. Infrared

Infrared is the best way to observe it.

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3 years ago
Explain why theories may be changed or replaced overnight time.
vlabodo [156]
They may be changed because they may find evidence of some thing that will change their perspective on things.
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A 60.0-kg child takes a ride on a Ferris wheel that rotates four times each minute and has a diameter of 20.0 m. (a) What is the
IrinaVladis [17]

Answer:

3 because

Explanation:

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