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3 years ago

According to Kepler’s second law, where in a planet’s orbit would it be moving fastest? Where would it be moving slowest?

Physics

1 answer:

nikitadnepr [17]3 years ago

8 0

Answer and Explanation :

According to Kepler's second law the speed of the planet depends on the distance between the Sun and the planet the speed of planet is the fastest when the planet is closer to the Sun and speed of the planet is the slowest when it is farthest from the Sun. This the Kepler's law , It determines how the speed of the object varies according to orbit.

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A car travelling at 15 m/s comes to rest in a distance of 14 m when the brakes are applied.

stira [4]

Answer:

-8.04 m/s2

Explanation:

To find the answer to this, you have to use the 4th kinematic equation:

$v^{2} = v^{2}_{0} + 2ax$

You plug into the equation to get:

$0 = 15^{2} + 2a(14)$

solve for a to get

-8.04 m/s2

3 0

3 years ago

Why should we not use nuclear energy

Softa [21]

Answer:

Barriers to and risks associated with an increasing use of nuclear energy include operational risks and the associated safety concerns, uranium mining risks, financial and regulatory risks, unresolved waste management issues, nuclear weapons proliferation concerns, and adverse public opinion.

Explanation:

5 0

3 years ago

What is the minimum work needed to push a 920-kg car 310 m up along a 6.5 ∘incline? Ignore friction.Express your answer using tw

AVprozaik [17]

Answer:

2800000J

Explanation:

Parameters given:

Mass = 920kg, weight = 920 * 9.8 = 9016N

Distance = 310m

Angle of inclination = 6.5°

Work done is given as :

W = F*d*cosA

Where A = angle of inclination

W = (9016 * 310 * cos6.5)

W = 2776993.59J

In 2 significant figures, W = 2800000J

7 0

3 years ago

What is the wavelength of red light in vacuum that has a frequency of 4.00 × 1014 hz?

Pachacha [2.7K]

Answer: $7.5(10)^{-7} m$

Explanation:

The frequency $\nu$ of an electromagnetic wave is given by the following equation:

$\nu=\frac{c}{\lambda}$

Where:

$c=3(10)^{8} m/s$ is the speed of light in vacuum

$\nu=4(10)^{14} Hz$ is the frequency of red light

$\lambda$ is the wavelength of red light

Isolating $\lambda$ :

$\lambda=\frac{c}{\nu}$

$\lambda=\frac{3(10)^{8} m/s}{4(10)^{14} Hz}$

Finally:

$\lambda=7.5(10)^{-7} m$

6 0

3 years ago

Concept map for kinetic energy, work and power

Helen [10]

Kinetic energy: the energy of motion

Work: the change in kinetic energy

Power: the rate of work done

Explanation:

The kinetic energy of an object is the energy possessed by the object due to its motion. Mathematically, it is given by:

$K=\frac{1}{2}mv^2$

where

m is the mass of the object

v is its speed

The work done an object is the amount of energy transferred; according to the energy-work theorem, it is equal to the change in kinetic energy of an object:

$W=K_f - K_i$