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stira [4]
3 years ago
7

An object on a straight line travels from point A to point B at a constant speed of 60 kmh-1 and returns to point A at a constan

t speed of 50 kmh-1. What is the average velocity for total motion?
1) 60 kmh-1
2) 55 kmh-1
3) 52.5 kmh-1
4) 50 kmh-1
5) 0
please help me...​
Physics
1 answer:
Kamila [148]3 years ago
5 0

Answer:

55kmh

Explanation:

first of all according to formula add both of the velocity and divide it by 2

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3 years ago
What is the resistance of : A) A 1.70 m long copper wire that is 0.700 mm in diameter? B) A 20.0 cm long piece of carbon with a
astra-53 [7]

Answer:

(I). The resistance of the copper wire is 0.0742 Ω.

(II). The resistance of the carbon piece is 1.75 Ω.

Explanation:

Given that,

Length of copper wire = 1.70 m

Diameter = 0.700 mm

Length of carbon piece = 20.0 cm

Cross section areaA = (2.00\times10^{-3})^2\ m

(I). We need to calculate the area of copper wire

Using formula of area

A=\pi r^2

A=3.14\times(\dfrac{0.700\times10^{-3}}{2})^2

We need to calculate the resistance

Using formula of resistance

R=\dfrac{\rho l}{A}

Put the value into the formula

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(II). We need to calculate the resistance

Using formula of resistance

R=\dfrac{\rho l}{A}

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8 0
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