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3 years ago

Which of these statements is correct about Newton's first law of motion?

Physics

1 answer:

nexus9112 [7]3 years ago

4 0

Answer:

Answer D: It describes the relationship between motion and force.

Explanation:

The answer is D because a law is something that describes something in nature, but does not try to explain how or why is occurs (that is a theory). Options B and C sound more like theories, while option A sounds like a definition. Option D is correct because a law describes without explaining.

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2. Suppose that the hanging mass is 120g. Calculate the net force on the system.

Setler79 [48]

1g=1000kg

120*1000

=120000kg

120000kg*10N/kg

=1200000N

5 0

2 years ago

A room with dimensions 7.00m×8.00m×2.50m is to be filled with pure oxygen at 22.0∘C and 1.00 atm. The molar mass of oxygen is 32

VashaNatasha [74]

1) 5765 mol

First of all, we need to find the volume of the gas, which corresponds to the volume of the room:

$V=7.00 m\cdot 8.00 m\cdot 2.50 m=140 m^3$

Now we can fidn the number of moles of the gas by using the ideal gas equation:

$pV=nRT$

where

$p=1.00 atm=1.01\cdot 10^5 Pa$ is the gas pressure

$V=140 m^3$ is the gas volume

n is the number of moles

R is the gas constant

$T=22.0^{\circ}+273=295 K$ is the gas temperature

Solving for n,

$n=\frac{pV}{RT}=\frac{(1.01\cdot 10^5 Pa)(140 m^3)}{(8.314 J/molK)(295 K)}=5765 mol$

2) 184 kg

The mass of one mole is equal to the molar mass of the oxygen:

$M_m = 32.0 g/mol$

so if we have n moles, the mass of the n moles will be given by

$m : n = 32.0 g/mol : 1 mol$

since n = 5765 mol, we find

$m=\frac{(5765 mol)(32.0 g/mol)}{1 mol}=1.84\cdot 10^5 g=184 kg$

3 0

3 years ago

what will be the resistivity of a metal wire of 2m length and 0.6mm in a diameter ,if the resistance of the wire is 50ohm . find

Maru [420]

Answer:Resistivity of the wire is 7.065 × 10^-8 Ω m.

Explanation:

I have no idea i just googled it

5 0

2 years ago

A 2-kg toy car is held at a height of 3.75 m above the floor. How much work is done

lisabon 2012 [21]

Answer:

work = 0

Explanation:

Let's remember that work is defined as the product of a force by a distance. Distance is the physical path displaced by the body under the action of that force.

W = F * d

where:

W = work [J]

F = force [N]

d = distance [m]

In this case, the toy is held at a height, there is no displacement from one point to another. So there is no work and this is equal to zero.

W = (2*9.81) * 0 = 0 [Joules]

4 0

3 years ago

How can your life be negatively impacted by not being scientifically literate in today's world?

aksik [14]

Answer:

may be or sometimes not

Explanation:

It depends on those who Surround you and your confidence

6 0

2 years ago