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valentina_108 [34]
3 years ago
8

Using definitions and examples compare chemical and physical changes.

Physics
1 answer:
inna [77]3 years ago
8 0
"There are several differences between a physical and chemical change in matter or substances. A physical change in a substance doesn't change what the substance is. In a chemical change where there is a chemical reaction, a new substance is formed and energy is either given off or absorbed."
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How to solve 56 equals 1/2 velocity squared
Alexxx [7]

Explanation:

Kinetic Energy (K.E)= 1/2 velocity (v) ^2

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3 years ago
A constant force N acts on an object as it moves along a straight-line path. If the object’s displacement is m, what is the work
JulijaS [17]

Answer:

Work = N x m

Explanation:

W=Fxd

Work equals force times the distance (displacement).

7 0
4 years ago
Meaning of direct current
givi [52]

Answer:

Definition of direct current. : an electric current flowing in one direction only and substantially constant in value

Explanation:

Direct current (DC) is the one directional flow of electric charge. An electrochemical cell is a prime example of DC power. Direct current may flow through a conductor such as a wire, but can also flow through semiconductors, insulators, or even through a vacuum as in electron or ion beams. The electric current flows in a constant direction, distinguishing it from alternating current (AC). A term formerly used for this type of current was galvanic current.

5 0
3 years ago
Read 2 more answers
While sitting in your car by the side of a country road, you see your friend, who happens to have an identical car with an ident
arsen [322]

Answer:

         v_s =7.74\ m/s

Explanation:

given,

Speed of sound = 343 m/s

frequency of horn = 260 Hz

the friend is approaching, the frequency is increased by the Doppler Effect. The frequency is 266 Hz

using formula

         f' = \dfrac{v}{v-v_s}f_0

         266= \dfrac{343}{343 - v_s}(260)

         1.023= \dfrac{343}{343 - v_s}

         343 - v_s = 335.26

         v_s =7.74\ m/s

the speed of friends approaching is equal to v_s =7.74\ m/s

7 0
3 years ago
Two wires with the same resistance have the same diameter but different lengths. If wire 1 has length L 1 and wire 2 has length
SVEN [57.7K]

Answer with Explanation:

We are given that

Length of wire 1=L_1

Length of wire 2=L_2

Resistivity of copper wire=\rho_1=1.7\times 10^{-5}\Omega-m

Resistivity of aluminum wire=\rho_2=2.82\times 10^{-5}\Omega-m

Wire 1=Copper wire

Wire 2=Aluminum wire

Diameter of both wires are same and resistance of both wires are also same.

We know that

Resistance =\frac{\rho l}{A}

When diameter of wires are same then their cross section area are also same .

l=\frac{RA}{\rho}

When resistance and area are same then the length of wire depend upon the resistivity of wire .

The length of wire is inversely proportional to resistivity.

When resistivity is greater then the length of wire will be short and when the resistivity  is small then the length of wire will be large.

\rho_1

Therefore, L_1>L_2

Hence, the length of wire 1 (copper wire) is greater than the length of wire 2 (aluminum).

\frac{L_1}{L_2}=\frac{\frac{RA}{1.7\times 10^{-5}}}{\frac{RA}{2.82\times 10^{-5}}}=1.66

L_1=1.66L_2

7 0
3 years ago
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