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3 years ago

Why does the sun move across the sky

Physics

2 answers:

fredd [130]3 years ago

4 0

The sun does not move it is actually the rotation of the earth on.it's axis that makes the sun appear to be moving

nasty-shy [4]3 years ago

3 0

Hey there,

Answer:

The sun appears to move across the sky but it is actually the earth which is orbiting around the sun.

Hope this helps :D

~Top

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Which of the following situations best illustrates Newton's first law

kotykmax [81]

Newton's first law says that an object at rest will stay at rest, while an object in motion will stay in motion unless acted upon by an outside force.

A great example of this is a ball sitting on the ground. The ball will not move until some force is used on it, rather that be you kicking it, the wind blowing it, etc. Once that force is used against it, the ball will continue to move until gravity, air resistance, a friction bring it to a stop.

4 0

4 years ago

a string of fifty 15 ohm christmas tree lights are connected in series. one burns out, they all burn out. calculate the total re

sesenic [268]

Answer:

The total resistance is 750 [ohm]

Explanation:

To solve this problem we must remember that when we have resistors connected in series, these are added each by the resistance value, in this way we have:

Rt = 15 * 50 = 750 [ohm]

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3 years ago

the pilot of a new stealth helicopter which has a mass of 15000 kg and was traveling 180 m / s accelerated to 250 m / s in six s

MariettaO [177]

Answer:

pf = 3750000 kg.m/s

F = 175000 N

Explanation:

Constant Acceleration

An object moves with constant acceleration if its velocity changes uniformly in time.

If we call vo to the initial speed, vf the final speed, and t the time, then the acceleration is calculated as:

$\displaystyle a=\frac{v_f-v_o}{t}$

The new stealth helicopter was traveling at vo=180m/s and changed to vf=250 m/s in t=6 seconds, thus the acceleration was:

$\displaystyle a=\frac{250-180}{6}$

$a=11.67~m/s^2$

Please note this number is shown rounded to the nearest hundredth, but it was stored in the calculator's memory with full precision. This fact affects the next calculation as will be noted below.

The acceleration must be produced for some net force that can be calculated by:

F = m.a

Where m=15000 Kg is the mass of the helicopter. Thus:

F = 15000 * 11.67

F = 175000 N

The above product would lead to the inaccurate result of 175050 if the acceleration would have not used with its full representation in the calculator's memory.

The momentum of an object of mass m and velocity v is:

p = m. v

The final momentum of the helicopter is:

pf = m.vf = 15000*250 m/s

pf = 3750000 kg.m/s

Note: When performing calculations over intermediate results, it's important to keep them as accurate as possible to preserve the accuracy of the final result.

6 0

3 years ago

What is the primary source of a sound?

brilliants [131]

Answer:

A vibration is the primary source of a sound.

8 0

4 years ago

A basketball has a mass of 1 kg and is traveling 12 m/s

cricket20 [7]

A) It would be doubled.

Why?

To answer the question, we just need to calculate the momentum of the basketball using the following formula:

$Momentum=mass*velocity\\\\Momenum=1kg*12\frac{m}{s}=12\frac{kg.m}{s}$

Now, we have calculated the momentum and the result is 12 kg.m/s, what would happen to the velocity if we double the momentum? Let's calculate it!

$Momentum=mass*velocity\\\\(2)*12\frac{kg.m}{s}=1kg*velocity\\\\velocity=\frac{24\frac{kg.m}{s} }{1kg} =24\frac{s}{s}$

Hence, we can see that if the momentum is doubled, the velocity will be doubled too.

Have a nice day!

7 0

3 years ago