3 years ago

When rockets split do they come back to earth?

1 answer:

4 0

I'm not 100% sure, but I believe what you mean is when they eject the old propulsion motors. Yes, they land in the ocean and the US Navy retrieves them for later use.

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A rock is dropped straight down from roof. It hits the ground with a velocity of 28.2 m/sec. How high was the roof, and how long

notsponge [240]

Answer:

18 secs

Explanation:

6 0

2 years ago

An object is initially moving at an unknown velocity. It accelerates at a rate of 2.0 m/s2 to a new velocity of 45 m/s in 10s. W

katrin2010 [14]

Answer:

Initial velocity=25m/s

Explanation:

acceleration(a)=2m/s^2

Final velocity(v)=45m/s

Time(t)=10seconds

Initial velocity(u)=?

V=u+axt

45=u+2x10

45=u+20

u=45-20

u=25m/s

6 0

3 years ago

A boy drops a coin down a well that is 225 m deep. How long does it take the coin to hit the bottom of the well? (Please state y

Alexxandr [17]

I had the same question. I'm pretty sure it's 23 seconds. :)

7 0

3 years ago

How far (in meters) above the earth's surface will the acceleration of gravity be 21.0 % of what it is on the surface?

weeeeeb [17]

Answer:

7532m

Explanation:

Gravity on the surface of the earth with radius R is given by:

$F_1=\frac{Gm_{earth}m_{object}}{R^2_{earth}}$

Gravity a distance r above the surface:

$F_2=\frac{Gm_{earth}m_{object}}{(R+r)^2}$

How big is r if:

$F_2=0.21\times F_1$

You get the following equation:

$R^2=0.21(R+r)^2=0.21R^2+0.41Rr+0.21r^2$

Solve for r:

$r^2+2Rr-\frac{79}{21} R^2=0$

$r=-R+\sqrt{R^2+\frac{79}{21}R^2}=-R+\sqrt{\frac{100}{21}R^2}=(\frac{10}{\sqrt{21}}-1)R$

8 0

3 years ago

As of 2016, Nevada has a current minimum wage of $8.25 an hour ($/hr). If someone was really picky about how much they owed, how

xz_007 [3.2K]

Once again, you'd need to know that there are 60 seconds in a minute, and 60 minutes in an hour :)

I'd say converting the minimum wage into cents rather than dollars would make this problem a lot easier. $8.25 = 825 ¢.

So if this person is earning 825 ¢ in an hour, we should divide 825 by 60 to find out how much they're making in a minute:

825 ÷ 60 = 13.75 ¢

Now, we just need to divide by 60 again to work out how much that is in seconds:

13.75 ÷ 60 = 0.229 ¢

So to answer your question, this person would make 0.229 ¢ a second (¢/s) on the job with minimum wage. Converting this value to dollars wouldn't be viable (as it'd just be $0.00, so it's best to leave the answer in cents!)

6 0

3 years ago

Read 2 more answers