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2 years ago

13

Select the correct answer. which object has the least amount of kinetic energy? a. a car driving down a road b. a soccer ball ro

lling down a hill c. a bicycle locked to a bike rack d. a satellite orbiting earth

1 answer:

solniwko [45]2 years ago

4 0

Answer:

c. a bicycle locked to a bike rack

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Consider a 2.54-cm-diameter power line for which the potential difference from the ground, 19.6 m below, to the power line is 11

tiny-mole [99]

Answer:

The line charge density is $1.59\times10^{-4}\ C/m$

Explanation:

Given that,

Diameter = 2.54 cm

Distance = 19.6 m

Potential difference = 115 kV

We need to calculate the line charge density

Using formula of potential difference

$V=EA$

$V=\dfrac{\lambda}{2\pi\epsilon_{0}r}\times\pi r^2$

$\lambda=\dfrac{V\times2\epsilon_{0}}{r}$

Where, r = radius

V = potential difference

Put the value into the formula

$\lambda=\dfrac{115\times10^{3}\times2\times8.8\times10^{-12}}{1.27\times10^{-2}}$

$\lambda=1.59\times10^{-4}\ C/m$

Hence, The line charge density is $1.59\times10^{-4}\ C/m$

4 0

3 years ago

the inertial mass of an object is measured by exerting a force on the object and measuring the object's BLANK using an inertial

JulijaS [17]

Answer:

acceleration

sorry i answered late

3 0

3 years ago

When does a star reach equilibrium?

LenaWriter [7]

A protostar reaches equilibrium when gravity is balanced by the outward force of nuclear fusion.

6 0

3 years ago

Are these two correct ?

gulaghasi [49]

Answer:

7. Your answer is correct dear, just add the unit

8. answer is 1.17m/s²

Explanation:

queation 7.

m = 3kg, F = 9N, a ?

F = ma

a = F/m = 9/3 = 3m/s²

Use the same approach for question 8

5 0

3 years ago

To avoid an accident, a driver steps on the brakes to stop a 1000kg car traveling at 65km/h. If the braking distance is 35m, how

Alenkinab [10]

To stop the car it would be 100m because if the car is going to 65km/h then it would still be 100km/h

8 0

3 years ago