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White raven [17]
4 years ago
12

Length is measured in

Physics
1 answer:
morpeh [17]4 years ago
7 0
It can be measured in cubic units, kilometers, meters, feet, or centimeters.
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The earth has about 80 times the mass of the earth's moon. The gravitational force exerted on the moon by the earth has what rel
chubhunter [2.5K]

Answer:

Both forces are the same.

Explanation:

The problem states that:

m_e = 80*m_m

The force exerted on the moon by earth is given by:

F_m=\frac{K*m_e*m_m}{d^2}   where K is the gravitational constant, and d is the separation distance between the earth and the moon.

The force exerted on the earth by moon is given by:

F_e=\frac{K*m_m*m_e}{d^2}   where K is the gravitational constant, and d is the separation distance between the earth and the moon.

The relation is therefore:

F_m/F_e = \frac{K*m_e*m_m/d^2}{K*m_m*m_e/d^2}=1

As you can see, they are the same.

4 0
4 years ago
A quantity of N2 occupies a volume of 1.4 L at 290 K and 1.0 atm. The gas expands to a volume of 3.3 L as the result of a change
lions [1.4K]

Answer:

\rho = 0.50 g/L

Explanation:

As we know that

PV = nRT

here we have

P = 1.0 atm

P = 1.013 \times 10^5 Pa

so we have

V = 1.4 \times 10^{-3} m^3

T = 290 K

now we have

(1.013 \times 10^5)(1.4 \times 10^{-3}) = n(8.31)(290)

n = 0.06

now the mass of gas is given as

m = n M

m = (0.06)(28)

m = 1.65 g

now density of gas when its volume is increased to 3.3 L

so we will have

\rho = \frac{m}{V}

\rho = \frac{1.65 g}{3.3 L}

\rho = 0.50 g/L

5 0
3 years ago
The behaviors that light exhibits are reflection, refraction, diffraction, polarization, and dispersion. Answer
Molodets [167]
I believe the correct answer is false. The behaviors that light exhibits are reflection, refraction, diffraction but not polarization, and dispersion. Light<span> behaves as a wave - it undergoes reflection, refraction, and diffraction just like any wave would. Hope this answers the question.</span>
5 0
4 years ago
A block of mass 5.6 kg is attached to a horizontal spring on a rough floor. Initially the spring is compressed 3.5 cm. The sprin
Mariana [72]

Answer:

The velocity of block = 0.188 \frac{m}{s}

Explanation:

Mass m = 5.6 kg

k = 1040 \frac{N}{m}

\mu = 0.26

x_{1} = 0.035 m  , v_{1} = 0

x_{2} = 0.02 m

From work energy theorem

K_{1} + U_{1} + W_{other} = K_{2} + U_{2}  --------- (1)

Kinetic energy

K = \frac{1}{2} k x^{2}  ------- (1)

Potential energy

U = \frac{1}{2} k x^{2} ------- (2)

Work done

W = F.s ------ (3)

From Newton's second law

R_{N} = mg

R_{N}  = 5.6 × 9.81 = 54.9 N

Friction  force = 0.4 × 54.9 = 21.9 N

Now the work done by the friction

W_{f} = - 21.9 × 0.015

W_{f} = - 0.329 J

Now kinetic energy

At point 1

K_{1} = \frac{1}{2} m v^{2} _{1}

K_{1} = 0

U_{1} = \frac{1}{2} k x^{2}

U_{1} = \frac{1}{2}  (1040) 0.035^{2}

U_{1} = 0.637 J

At point 2

K_{2} = \frac{1}{2} (5.6) v^{2} _{2}

K_{2} = 2.8 v_{2} ^{2}

Potential energy

U_{2} = \frac{1}{2}  k x_2^{2}

U_{2} = \frac{1}{2}  (1040) 0.02^{2}

U_{2} = 0.208 J

From equation (1) we get

0 + 0.637 - 0.329 = 2.8 v_{2} ^{2} + 0.208

2.8 v_{2} ^{2} = 0.1

v_{2} = 0.188 \frac{m}{s}

This is the velocity of block.

6 0
4 years ago
When an atom that has no charge looses two electrons it becomes a
alex41 [277]

Answer: it becomes a positive ion

Explanation:

So, when an atom loses 2 electrons there will be no change in the number of neutrons. Therefore, an isotope will not form. Thus, it is concluded that when an atom with no charge loses two electrons, it becomes a positive ion.

8 0
3 years ago
Read 2 more answers
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