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3 years ago

How much work is done against gravity when lifting a 2-kg sack of groceries a distance of 2.5 meters?

Physics

1 answer:

Crazy boy [7]3 years ago

8 0

W = F x d/x = (m x Ag) x h, therefore, mass (2kg x 9.8) x 2.5m = 49J

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How to calculate motion

otez555 [7]

Answer:

Distnace per unit time

Explanation:

3 0

3 years ago

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An electron is accelerated from rest by a potential difference of (24.5 A) V for a distance of (4.50 B) cm. Determine the de Bro

DiKsa [7]

Answer:

206 pm

Explanation:

We are given that

Potential difference, $\Delta V=24.5+A V$

Distance,d= $4.5+B cm$

We have to determine the de Brogile wavelength of the electron.

A=11 and B=5

$\Delta V=24.5+11=35.5 V$

$d=4.5+5=9.5 cm$

Charge on electron,q = $1.6\times 10^{-19} C$

Mass of electron=m= $9.1\times 10^{-31} kg$

Speed of electron, $v=\sqrt{\frac{2q\Delta V}{m}}$

Using the formula

$v=\sqrt{\frac{2\times 1.6\times 10^{-19}\times 35.5}{9.1\times 10^{-31}}$

v= $3.53\times 10^6 m/s$

de Brogile wavelength, $\lambda=\frac{h}{mv}$

Where $h=6.626\times 10^{-34}$

$\lambda=\frac{6.626\times 10^{-34}}{9.1\times 10^{-31}\times 3.53\times 10^6}=2.06\times 10^{-10}=206\times 10^{-12} m$

1 pm= $10^{-12} m$

$\lambda=206 pm$

7 0

3 years ago

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A 150 N force acts on an object for five seconds in changes the objects velocity by 30 m/s. What is the mass of the object?

Vlada [557]

F=ma

150 N= ma

a= 30/5 = 6

150 = m6

m = 25 kg

6 0

3 years ago

List 3 ways that living creatures use proteins

ANTONII [103]

3 ways would be they are used for movement, form structure and carry out reactions, processes, and cells

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3 years ago

A block of weight 5000 N is pushed up a slope by a force of 250 N. Assume there is no friction. Calculate:

Burka [1]

The actual mechanical advantage, the velocity ratio, and the length of the slope if the height of the slope is mathematically given as

A=20
VR=0.05
x=20m

<h3>What are the actual mechanical advantage, the velocity ratio, and the length of the slope if the height of the slope is 10 m?</h3>

Question Parameters:

A block of weight 5000 N is pushed up a slope by a force of 250 N.

Generally, the equation for the actual mechanical advantage is mathematically given as

A=Fout/Fin

A=5000/250

A=20

the velocity ratio is given by the distance moved by the effort divided by the distance moved by the load

Therefore

VR=250/5000

VR=0.05

the length of the slope if the height of the slope is 10 m

Assume the slope is at an angle of 30

Hence

sin 30=10/x

x=20m