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AysviL [449]
3 years ago
15

The volume of water in a tank is 750 litres when it is full. If the length and breadth

Physics
1 answer:
love history [14]3 years ago
3 0

Given parameters:

Volume of water in the tank = 750litres

Length of the tank = 150cm

Breadth of tank = 50cm

Unknown:

Height of the tank = ?

To solve this problem, we must understand the concept of volume. Volume is a property of solid bodies. It is mathematically derived as:

  Volume  = length x Breadth x height

The unknown here is the height and we should go ahead to solve for it.

<em>But the units are inconsistent. </em>

Therefore, convert litres to cm³;

          1 litre  =  1000cm³  

         750 litres = 1000 x 750  = 750,000cm³      

Now input the parameters and solve for the height;

          750000 = 150 x  50 x height

                height  = \frac{750000}{7500}   =  100cm

Therefore, the height of the tank is 100cm

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A car moves along an x axis through a distance of 900 m, starting at rest (at x = 0) and ending at
OlgaM077 [116]
A car moves along an x axis through a distance of 900 m, starting at rest (at x = 0) and ending at rest (at x = 900 m). Through the first 1/4 of that distance, its acceleration is +6.25 m/s2. Through the next 3/4 of that distance, its acceleration is -2.08 m/s2. What are (a) its travel time through the 900 m and (b) its maximum speed? 

<span>Solve for the time at the 1/4 mark. That's 225 m. How? d = (1/2)at^2 ( initial velocity zero). Thus 225 = (1/2) 6.25 t^2. t^2 = ( 225 * 2 ) / 6.25. t = 8.5 sec. </span>

<span>At the other end t^2 = (675 * 2) / 2.08 -- we reversed the sign and ran time backwards. t = 25.5 sec. </span>

<span>So total time is 8.5 + 25.5 or 34 sec. </span>

<span>Since zero initial velocity: v^2 = 2 a d. Here, v^2 = 2 * 6.25 * 225. v = 53 m/s. That's the fastest speed since braking then occurs.</span>
7 0
4 years ago
Bill was really bored at work. During his break, he decided to check his carotid artery. He placed both fingers on his neck and
Sergeeva-Olga [200]

Answer:

72 beats per minute

Explanation:

Heart beat causes the flow of blood round the body. This heart beat can be felt as pulse in the wrist or neck carotid artery. The heart rate which is measured in beats per minute (BPM) is used to determine the number of heart beats per minute.

You can calculate your BPM using the carotid artery found in the neck close to the windpipe.

Given that for 20 seconds, Bill had a total of 24 beats.

60 seconds = 1 minute.

Hence,  Bill's BPM = (24 beats per 20 seconds) * (60 seconds per minute) = 72 beats per minute

5 0
3 years ago
Weight of an object various replaces on the earth.why?​
german

Answer:

Weight change from place to place because it is a strong function of gravity. Recall that mass is universally constant. Hence weight varies becuas gravity varies. ... Other reason for variation of weight across the earth's surface are, rotation of the earth, altitude and local topography of the area.

5 0
3 years ago
An object moving north with an initial velocity of 14m/s accelerates 5m/s squared for 20 seconds. What is the final velocity of
Gemiola [76]

Since it moves 5 m/s faster every second, after 20 seconds it's moving 100 m/s faster than when it started speeding up.

If it was moving at 14 m/s when the acceleration began, it's moving at 114 m/s at the end of the 20 seconds.  Its velocity is <em>114 m/s North.</em>

That's 255 mph !

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3 years ago
A moving hammer hits a nail and drives it into a wall. if the hammer hits the nail with twice the speed, how much deeper will th
vlabodo [156]
<span>This is an example of work-energy theorem where it lets a person accumulate the strength of<span> the muscles over the duration of the swing, allowing much<span> bigger forces as the hammer hits the nail.
Moreover, the work done on an object by a net force is equals to the change in kinetic energy of the object, which is expressed as W = KEf - KEi. </span></span></span>
<span>Therefore, if the hammer hits the nail with twice the speed, it corresponds to 4 times the energy and four times the driving distance. If the hammer hits with three times the speed, the driving distance is 9 times as much.</span>  
5 0
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