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3 years ago

calculate the pressure produced by applying 15 n force on a flat surface having a width of 60 cm and a length of 5m

Physics

1 answer:

iren [92.7K]3 years ago

8 0

Answer:

5 Pascals

Explanation:

Pressure is equal to force/area and the area is 60cm to m is 0.6m. Then the area is 0.6m×5m=3m^2. which gives a pressure of 15N/3m^2=5Pa

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With "normal" gravity, we used a potential energy of mgh. Now with the gravity that is more accurate over longer distances we us

Artemon [7]

Answer:

A general solution is $\Delta U=mh\frac{GM}{r^{2}}\frac{r}{r+\Delta h}$ and a particualr case is mgh, it is just to distance around the radius Earth.

Explanation:

We can use a general equation of the potential energy to understand the particular and general case:

The potential energy is defined as $U=-\int F\cdot dx$ , we know that the gravitational force is $F=GmM/r^{2}$ , so we could find the potential energy taking the integral of F.

$U=-GmM/r$ (1)

We can find the particular case, just finding the gravitational potential energy difference:

$\Delta U=U_{f}-U_{i}$ . Here Uf is the potential evaluated in r+Δh and Ui is the potential evaluated in r.

Using (1) we can calculate ΔU.

$\Delta U=-\frac{GmM}{r+\Delta h}+\frac{GmM}{r}$

Simplifying and combining terms we have a simplified expression.

$\Delta U=mh\frac{GM}{r^{2}}\frac{r}{r+\Delta h}$ (2)

Let's call $g=\frac{GM}{r^{2}}$ . It is the acceleration due to gravity on the Earth's surface, if r is the radius of Earth and M is the mass of the Earth and we can write (2) as ΔU=mgh, but if we have distance grader than r we should use (2), otherwise, we could get incorrect values of potential energy.

I hope i hleps you!

3 0

4 years ago

Alan leaves Los Angeles at 8:00 a.m. to drive to San Francisco, 400 mi away. He travels at a steady 46.0 mph . Beth leaves Los A

elena-14-01-66 [18.8K]

Answer:

25 min, 48 sec

Explanation:

Alan:

t = d/v

= 400 mi / 46 mph = 8.70 hr

So it took Alan 8.70 hrs; from 8 am, that's 4:42 pm that he arrives.

t = d/v

= 400 mi / 55 mph = 7.27 hr

So it took Beth 7.27 hrs; from 9 am, that's 4:16:12 that she arrives.

4:42 - 4:16:12 = 25.8 minutes = 25 minutes, 48 sec

4 0

4 years ago

Which statement best defines the relationship between work and energy?

alexdok [17]

The relationship between work and energy is that work can transfer energy between objects and cause a change in the form of energy.

<h3>What is energy?</h3>

Energy is simply defined as the ability to do work.

Energy possessed by any object or matter enables it to do work of various forms.

Energy can be transferred from one object to another. Also, energy can be transformed into various forms.

Therefore, the relationship between work and energy is that work can transfer energy between objects and cause a change in the form of energy.

Learn more about energy and work at: brainly.com/question/13881533

#SPJ1

5 0

2 years ago

Read 2 more answers

Define force and provide an example

ollegr [7]

Answer:

force-strength,power or energy as an attribute of motion, movement or action. Example: Frictional force.

4 0

4 years ago

A water strider bug is supported on the surface of a pond by surface tension acting along the interface between the water and th

Alik [6]

Answer:

minimum interface length = 1.36 mm

Explanation:

given data

weight of the bug = $10^{-4}$ N

solution

we will apply here Surface Tension formula that is

Surface Tension ,σ = Force ÷ length ........................1

and we consider here surface tension for water is 7.34 × $10^{-2}$ N/m

so that here minimum interface length needed to support the bug is

minimum interface length = Force ÷ σ

minimum interface length = $10^{-4}$ ÷ 7.34 × $10^{-2}$

minimum interface length = 1.36 mm

4 0

3 years ago