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3 years ago

How long does it take a car travelling at 80 m/s to decelerate to 18 m/s with an acceleration rate of -16m/s?

Physics

1 answer:

sertanlavr [38]3 years ago

4 0

initial velocity=u=80m/s
Final velocity=v=18m/s
Acceleration=a=-16m/s^2
Time=t

We know

$\boxed{\sf a=\dfrac{v-u}{t}}$

$\\ \sf\longmapsto t=\dfrac{v-u}{a}$

$\\ \sf\longmapsto t=\dfrac{18-80}{-16}$

$\\ \sf\longmapsto t=\dfrac{-62}{16}$

$\\ \sf\longmapsto t=3.8s$

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Convert 66.2 mi/h to m/s. 1 mi = 1609 m.<br> Answer in units of m/s.

Kryger [21]

Answer:

Explanation:

66.2mi/h to m/s

$\frac{1609m}{1mi}$ × $\frac{66.2mi}{1h}$ × $\frac{1h}{60min}$ × $\frac{1min}{60s}$

mi will go with mi
h with h
min with min
m/s is left

$\frac{1609*66.2}{60*60}$ = 29.58772222

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4 years ago

Suppose an asteroid orbiting the sun had an orbital period of 7. 5 years. What would its orbital radius be?.

creativ13 [48]

By using the orbital period equation we will find that the orbital radius is r = 4.29*10^11 m

<h3>What is the orbital period?</h3>

This would be the time that a given body does a complete revolution in its orbit.

It can be written as:

$T = \sqrt{\frac{4*\pi ^2*r^3}{G*M} }$

Where:

π = 3.14
G is the gravitational constant = 6.67*10^(-11) m^3/(kg*s^2)
M is the mass of the sun = 1.989*10^30 kg
r is the radius, which we want to find.

Rewriting the equation for the radius we get:

$T = \sqrt{\frac{4*\pi ^2*r^3}{G*M} }\\\\r = \sqrt[3]{ \frac{T^2*G*M}{4*\pi ^2} }$

Where T = 7.5 years = 7.5*(3.154*10^7 s) = 2.3655*10^8 s

Replacing the values in the equation we get:

$r = \sqrt[3]{ \frac{(2.3655*10^8 s)^2*(6.67*10^{-11} m^3/(kg*s^2))*(1.989*10^{30} kg)}{4*3.14 ^2} } = 4.29*10^{11 }m$

So the orbital radius is 4.29*10^11 m

If you want to learn more about orbits, you can read:

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2 years ago

A simple, direct-current electrical circuit is shown below.

kap26 [50]

The direction of current flow is given by an arrow in the electrical circuit.

Several categories are used to categorise electrical circuits. One-way current only flows through a direct-current circuit. As with most residential circuits, an alternating-current circuit is a channel for transmitting electrical current that pulses back and forth numerous times each second.

A battery or generator, a device that provides energy to the charged particles that make up the current, a device that uses current, such as a lamp, an electric motor, or a computer, and the connecting wires or transmission lines make up an electrical circuit.

A source of electrical power, two wires that can transmit current, and a light bulb make up an electrical circuit. Both wires have one end connected to a cell terminal and the other end connected to a light bulb. When the light bulb is turned off, the electrical circuit is disrupted.

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2 years ago

What conducts heat the be best?

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It just has to be metal

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3 years ago

Do magnets have to touch each other in order to experience a magnetic<br> force? Explain

tiny-mole [99]

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3 years ago