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evablogger [386]
3 years ago
8

a .1-kilogram ball rolls across the floor at a speed of 2 meters per second. Another .1 kilogram ball rests on a shelf 1 meter a

bove the floor. Which ball has more energy?
Physics
1 answer:
JulsSmile [24]3 years ago
6 0
First, we need to fight the weight of the balls instead of their mass.  We do this by multiplying their weight it kg by 9.8.  This gives us .98 N.  To find the potential energy of the rolling ball, we find its kinetic energy.  The formula for this is KE=mass*velocity^2*1/2.  

Plugging in our numbers, we have Kinetic energy = .1 * 1^2*1/2 which gives us .05 joules.

Now we find the potential energy of the ball on the shelf.  For this we do:

Potential energy = .1*9.8*1, and our answer is .98 joules.  Clearly, the ball on the shelf has more energy.
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The energy flow per unit time per unit area (S) of an electromagnetic wave has an average value of 440 mW/m2. The maximum value
mafiozo [28]

To solve this problem we will proceed to convert the Intensity Units given to a normal system, that is, to standardize their value. Later we will use the value of the electric field according to the RMS electric field, to find it.

Finally the magnetic field would be given based on the previously found electric field, depending on the speed of light:

The value of the intensity is:

I = 440mW/m^2 = 0.440W/m^2

The maximum value of the electric field is,

E_{max} = \sqrt{2}E_{rms}

E_{max} = \sqrt{2}\sqrt{Ic\mu_0}

Where,

I = Intensity,

\mu= Permeability constant

c = Speed of light

Replacing,

E_{max} = \sqrt{2}\sqrt{(0.440)(3*10^8)(4\pi*10^{-7})}

E_{max} = 18.2V/m

The maximum value of the magnetic field is,

B_{max} = \frac{E_{max}}{c}

B_{max} = \frac{18.2}{3*10^8}

B_{max} = 6.06*10^{-8}T

Therefore the maximum magnetic field is 7.10*10^{-8}T

7 0
3 years ago
The temperature of a 50 g sample of aluminum is raised from 20°c to 60°c when 440 cal of heat are added. the specific heat capac
GaryK [48]
40 percent is how much aluminum is added
4 0
3 years ago
Suppose a plot of 1/λ vs f has a slope of 0.728, what is the wave velocity? Give only the numerical answer with 4 decimal place
Charra [1.4K]

Answer:

The wave velocity is 1.3736

Explanation:

A plot of inverse of wavelength (λ) versus frequency (f), can be analyzed as follows;

The vertical axis will be 1/λ and the horizontal axis will be f

slope = (Δ1/λ)/(Δf)

        = 1/(fλ)

∴ 1/(fλ) = 0.728

From wave equation, V = fλ

where;

V is the wave velocity

f is the frequency of the wave

λ is the wavelength

1/(fλ) = 0.728

1/(V) = 0.728

V = (0.728)⁻¹

V = 1.3736

Therefore, the wave velocity is 1.3736

3 0
3 years ago
Read 2 more answers
A car traveling in a straight line at an initial speed of 8.0 meters per second accelerates uniformly to a speed of 14 meters pe
Whitepunk [10]

The equation we can use here is:

v^2 = v0^2 + 2 a d

where v is final velocity, v0 is intial velocity, a is acceleration and d is distance

 

14^2 = 8^2 + 2 a (44)

<span>a = 1.5 m/s^2</span>

4 0
2 years ago
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Which car is accelerating?
Oliga [24]

Answer:

The car that is accelerating is B a car that rounds a curve at a constant speed

Explanation:

Although all of the cars are at a constant speed or not moving acceleration is the change in speed or the change of directions therefore making the only car changing directions your answer.

8 0
2 years ago
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