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Cloud [144]
3 years ago
5

What kind of a charge does an object have if it has gained electrons?

Physics
2 answers:
vladimir1956 [14]3 years ago
6 0
Hey there!

C is the answer. This is because electrons have negative charges. So if an object gains more electrons, then it has a negative charge.

I hope this helps!
hjlf3 years ago
3 0
When an object gains electrons it gains a negative charge.

C. Negative
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The builders of the pyramids used a long ramp to lift 20000-kg (20.0-ton) blocks. If a block rose 0.840 m in height while travel
olga_2 [115]

Given Information:  

Mass = m =  20000 kg

Height of ramp = h = 0.840 m

Length of ramp = L = 20 m

Required Information:  

Uphill Force = F = ?

Answer:

F = 8232 N

Explanation:

The force can be found using the equation

F = mgsinθ

Where m is the mass of block, g is the acceleration due to gravity

Since the ramp can be modeled as an inclined plane so it can formed into a triangle, recall that in right angle triangle sinθ is equal to opposite over hypotenuse. The opposite is the height and hypotenuse is the ramp surface.

sinθ = h/L = 0.840/20 = 0.042

F = 20000*9.8*0.042

F = 8232 N

Therefore, an uphill force of 8232 N would be needed.

8 0
3 years ago
Two soccer players, mary and jane, begin running from approximately the same point at the same time. mary runs in an easterly di
Karo-lina-s [1.5K]
As you illustrate the problem, you may come up with the same diagram as the one shown in the attached picture. The relative velocity is the linear velocity between the two velocities. This is calculated by simply finding the difference of their velocities. Since, the velocity is with respect to Jane relative to Mary, the solution is as follows:

Relative velocity = Velocity of Jane - Velocity of Mary
Relative Velocity = 4.67 m/s - 3.59 m/s = 1.08 m/s 

7 0
3 years ago
A penny is placed at the outer edge of a disk (radius = 0.179 m) that rotates about an axis perpendicular to the plane of the di
fgiga [73]

Answer:

\mu = 0.28

Explanation:

Time period of the revolution of the disc is given as

T = 1.60 s

now the angular speed of the disc is given as

\omega = \frac{2\pi}{T}

so we will have

\omega = \frac{2\pi}{1.60}

\omega = 3.92 rad/s

now at the rim position of the disc the net force on the penny is due to friction force

So we will have

\mu mg = m\omega^2 r

here we will have

\mu g = \omega^2 r

\mu = \frac{\omega^2 r}{g}

\mu = \frac{3.92^2 (0.179)}{9.81}

\mu = 0.28

7 0
3 years ago
Which situation describes the highest rate of power?
Darya [45]

Answer : The correct option is, (D) A machine does 400 joules of work in 5 seconds.

Explanation :

Power : It is defined a the rate of doing work per unit time.

Formula used :

P=\frac{w}{t}

where,

P = power

w = work done

t = time

Now we have to determine the rate of power for the following options.

(A) A machine does 200 joules of work in 10 seconds.

P=\frac{200}{10}=20W

(B) A machine does 400 joules of work in 10 seconds.

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(C) A machine does 200 joules of work in 5 seconds.

 P=\frac{200}{5}=40W

(D) A machine does 400 joules of work in 5 seconds.

P=\frac{400}{5}=80W

From this we conclude that, a machine does 400 joules of work in 5 seconds has the highest rate of power.

Hence, the correct option is, (D)

8 0
3 years ago
The process of wind blowing sand from one location to another is called
lesya [120]

Answer:

weathering

Explanation:

3 0
3 years ago
Read 2 more answers
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