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2 years ago

A bus is traveling 25.0 km in 2 hours. What is the speed of the bus in millimeters per second?

Physics

1 answer:

trasher [3.6K]2 years ago

8 0

Answer:

3472.222

Explanation:

In one hour, the bus travels at a 12.5 km. The speed is 12.5km/hr

Convert it to mm/s

And you get 3472.2mm/s

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For a ship moving against the current, it takes 9 hours to cover a distance of 113.4 miles. how much does it take this ship to r

Digiron [165]

Let x mph be the speed of the ship in still water.
Against the current, the net speed is, (x-1.9) mph.
Time, t= distance, d/ Speed, v => 9= 113.4/(x-1.9) => 9(x-1.9) = 113.4 => x-1.9 = 113.4/9 => x = 12.6+1.9 = 14.5 mph

Moving with the current, the net speed of the ship = 14.5+1.9 =16.4 mph

Time take, t = d/v = 113.4/16.4 = 6.915 hours

3 0

2 years ago

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The index of refraction of a material medium must be less than 1 true or flase

OLga [1]

That statement is flase. The index of refraction
of every material is more than 1.0 .

8 0

2 years ago

Just wondering, what do you guys think the 5th dimension is? I've always believed it to be light.

zepelin [54]

Answer: In the 5th dimension, they who claim to know, say that there is only one time, including the past and the future.

8 0

2 years ago

Learning Goal: To introduce the idea of physical dimensions and to learn how to find them.Physical quantities are generally not

Ne4ueva [31]

Answer:

volume : {l}^3

speed: (l)^1*(t)^-1

Explanation:

Volume is a measure of 3 dimensional space. It is expressed with 3 orthogonal lengths. The volume of a box would be the product of it's height, width and length. These 3 are longitudes that can be expressed in meters, feet, inches, etc. Because these are 3 longitudes multiplied the result will be a cubic longitude (l)^3.

A more general method for finding a volume is to use integral calculus:

$V = \int\int\int{x} * {y} * {z} * dx * dy * dz$

This is for Cartesian coordinates. Cylindrical and spherical coordinates can also be used.

Speed is defined as the rate of change in position respect of time:

$vx = \frac{\delta x}{\delta t}$

For movement in one dimension.

For movement in 3 dimensions you calculate the speed component of each space direction and express them as components of a speed vector:

$\v{v} = \frac{\delta x}{\delta t} \hat{i} + \frac{\delta y}{\delta t} \hat{j} + \frac{\delta z}{\delta t} \hat{k}$

This is a vector of velocity components, each one is expressed as a division of a longitude over a time, so speed components have dimensions of (l)^1*(t)^-1

The speed vector has a magnitude that is obtained with the Pitagoras theorem:

$v = \sqrt{vx^{2} + vy^{2} + vz^{2}}$

Since each component is squared, added together and then the square root is taken this magnitude is also in (l)^1*(t)^-1

4 0

2 years ago

A cruise ship sails due south at 2.50 m/s while a coast guard patrol boat heads 19.0° north of west at 4.80 m/s. What are the x-

Nesterboy [21]

Answer:

Explanation:

We shall represent the velocity of cruise ship and coast guard petrol boat in vector form .

velocity of cruise ship

Vcs = - 2.5 j

Vpb = - 4.8 cos 19 i + 4.8 sin 19 j = - 4.54 i + 1.56 j

velocity of the cruise ship relative to the patrol boat

= Vcs - Vpb

= - 2.5 j - ( - 4.54 i + 1.56 j )

= - 2.5 j + 4.54 i - 1.56 j

= 2.04 i - 1.56 j .

x-component of the velocity of the cruise ship relative to the patrol boat

= 2.04 m /s

y-component of the velocity of the cruise ship relative to the patrol boat

= - 1.56 m /s .

7 0

2 years ago