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melisa1 [442]
3 years ago
9

Which of the following are examples of radiation? (Choose all that apply)

Physics
1 answer:
olchik [2.2K]3 years ago
4 0

Answer:

Explanation:

Visible light.

Infrared light.

Near ultraviolet light.

Microwaves.

Low frequency waves.

Radio waves.

Waves produced by mobile phones.

A campfire's heat.

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A tugboat tows a ship with a constant force of magnitude F1. The increase in the ship's speed during a 10 s interval is 3 km/h.
Amanda [17]

Answer:

F_{1}=\frac{1}{5}F_{2}  or  F_{2}=5F_{1}

In other words, F_{1} is one fifth of F_{2} or F_{2} is five times as big as F_{1}

Explanation:

In order to solve this problem we must start by sketching the situation (refer to the attached picture).

When the ship is pulled only by force 1, it will change its speed by 3km/hr in 10 seconds. So in order to use these values we need to either turn the km/hr in km/s or turn the seconds to hours. Let's turn the seconds to hours:

10s*\frac{1hr}{3600s}=\frac{1}{360} hr

so we can now use the acceleration formula to find the acceleration of the boat so we get:

a=\frac{\Delta v}{\Delta t}

which will give us an accceleration of:

a=\frac{3km/hr}{\frac{1}{360}hr}=1080km/hr^{2}

once we got the acceleration we can for sure say taht:

F_{1}=ma=m*1080\frac{km}{hr^{2}}

Now, if we take a look at the second drawing we can see that the resultant force applied to the boat is found by adding the two forces, force one and force two, so we get:

F_{1}+F_{2}=ma

in this case the acceleration changes because the change in velocity is of 18km/hr in the same 10 seconds, so we get that:

a=\frac{\Delta v}{\Delta t}

a=\frac{18km/hr}{\frac{1}{360}hr}=6480km/hr^{2}

so we can say that:

F_{1}+F_{2}=m*6480km/hr^{2}

we can substitute the first force into this equation so we get:

m*1080km/hr^{2}+F_{2}=m*6480km/hr^{2}

and solve for the second force, so we get:

F_{2}=m*6480km/hr^{2}-m*1080km/hr^{2}

which yields:

F_{2}=m*5400km/hr^{2}

Now we can compare theh two forces, force 1 and force 2 by dividing them:

\frac{F_{1}}{F_{2}}=\frac{m*1080km/hr^{2}}{m*5400km/hr^{2}}

which yields:

\frac{F_{1}}{F_{2}}=\frac{1}{5}

when solving for the first force we get:

F_{1}=\frac{1}{5}F_{2}

which tells us that the second force is one fifth of the first force.

and when solving for the second force we get that:

F_{2}=5F_{1}

which means that the second force is 5 times as big as the first force.

8 0
3 years ago
A student throws a 140 g snowball at 6.5 m/s at the side of the schoolhouse, where it hits and sticks. What is the magnitude of
Vitek1552 [10]

Answer:5.35N

Explanation:

Force is defined as the product of mass of an object and its acceleration.

Acceleration is the change in velocity of an object with respect to time.

Acceleration = velocity/ time = 6.5/0.17 = 38.2m/s²

since F = ma and mass is 140g

140g to kg will be 140/1000 = 0.14kg

F = 0.14× 38.2

F = 5.35N

magnitude of the average force is 5.35N

3 0
3 years ago
The earliest radio broadcasts on Earth were emitted about 100 years ago. Approximately where are these initial radio waves now?
Gala2k [10]

Answer:

100 ly are d=9.454255\times10^{17}m

Explanation:

The speed of light is, by definition (we define this and derive a definition of distance from there nowadays), c=299792458m/s. We want to know, at this speed, how much distance the radio signals travel in 100 years. Since each year has 365 days (not a leap one though), each day has 24 hours, each hour has 60 minutes and each minute has 60 seconds, the number of seconds in a year will be (365)(24)(60)(60)=31536000, so the distance traveled by the waves in 100 years will be:

d=vt=(299792458m/s)(100)(31536000s)=9.454255\times10^{17}m, which, of course, are 100 light years.

3 0
3 years ago
PLeAsE hElp <br> What is the kinetic energy of 14 Kg traveling at a velocity of 3m/s east
harkovskaia [24]

Answer:

Please see the given attachment.

Explanation:

Stay safe, stay healthy and be blessed.

Thank you.

<h2><em><u>PLEASE</u></em><em><u> </u></em><em><u>MARK</u></em><em><u> </u></em><em><u>ME</u></em><em><u> </u></em><em><u>AS </u></em><em><u>BRAINLEST</u></em><em><u>.</u></em></h2>

4 0
2 years ago
The speed limit sign in indiana reads 60 miles per hour. convert these units to meters per second
cluponka [151]

Answer:

26.822 m/s

Explanation:

60 mi/hr  *  5280 ft/mile *  1 hr / 3600 sec  *  12 in / foot * 1 meter / 39.37 in = <u>26.822 m/s</u>

3 0
1 year ago
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