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3 years ago

A box is pushed horizontally with constant speed across a rough horizontal surface.

Physics

1 answer:

Natasha_Volkova [10]3 years ago

6 0

Answer:

what is the answers? so i can't answer.

Explanation:

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A plane lands and comes to a complete stop through 180 m of runway with a deceleration of 6.25 m/s2 [N]. Determine the plane’s v

oksano4ka [1.4K]

Answer:

47.43 m/s

Explanation:

Given that,

Final speed of a plane, v = 0

Distance, d = 180 m

Acceleration of the plane, a = -6.25 m/s² (deceleration )

We need to find the plane's velocity. Let it was u. So, using the third equation of kinematics as :

$v^2-u^2=2ad\\\\u^2=0^2-2\times (-6.25)\times 180\\\\u=\sqrt{2250} \\\\u=15\sqrt{10}\ m/s\\ \\\text{or}\\\\u=47.43\ m/s$

So, the plane's velocity when it first touched the landing strip is 47.43 m/s.

4 0

3 years ago

What is mass ?<br> Please help

givi [52]

Answer:

Gage's definition: a measure of the amount of matter in an object.

Explanation:

Dictionary definition: a coherent, typically large body of matter with no definite shape.

Thanks for letting me help!!

4 0

4 years ago

Read 2 more answers

the two rotating systems shown in the figure differ only in that the two identical movable masses are positioned at different di

svetoff [14.1K]

Answer: the block at the right lands first

Explanation:

7 0

3 years ago

Technician a says that shims are sometimes used to adjust camber. technician b says that shims can sometimes be used to adjust c

meriva

I'll have to be honest with you. I've read both of those opinions several times, carefully, and it looks to me like both technicians are saying exactly the same thing.

Now, my knowledge of shims and camber is limited (to approximately zero), so all I can say to answer the question is this: If EITHER technician is correct, then they're BOTH correct.

8 0

3 years ago

A vertical piston-cylinder device contains water and is being heated on top of a range. During the process, 63 Btu of heat is tr

jolli1 [7]

Answer:

The water would have a change in the energy of 50 BTU

Explanation:

Under the assumption that the piston-cylinder system is a closed system, then the conservation law of the system would be: $E_{in}-E_{out}=E_{change}$ , where $E_{in}$ is all the energy that goes into the system, $E_{out}$ is all the energy that leaves the system and, $E_{change}$ is the change of the energy of the system.
For this case the energy that is feeded to the system is heat: 63 BTU.
There is two ways that energy is leaving this system: 8 BTU of heat as losses through the side walls and, 5 BTU of work done by the vapor on the piston.
Then the change of energy of the system is: $E_{change}=E_{in}-E_{out}=63 BTU-(8BTU+5BTU)=50BTU$ .

6 0

3 years ago