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MariettaO [177]
3 years ago
9

3. A skater moves across the ice a distance of 12 m before a constant frictional force of 15 N cause him to stop. His initial sp

eed is 2.2 m/s . Calculate the skater's mass.
Physics
1 answer:
RSB [31]3 years ago
6 0

Explanation:

thankyou fo

r the poimts

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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
Does the collision between the cart and the brick follow the law of momentum conservation? Make a claim (yes or no) and support
murzikaleks [220]

Answer:

yes it does

Explanation:

Going by the law of conservation of momentum, when two objects collides, the momentum of one object is transferred to the other object.

This collision can be elastic or inelastic coliision

let the mass of the brick be m1

the mass of the cart be m2

the velocity (initial and final) of the brick  u1 and v1

the velocity (initial and final) of the cart u2 and v2

For elastic collision

m1u1+m2u2= m1v1+m2v2

For inelastic collision the two bodies will move with the same velocity after impact

m1u1+m2u2=(m1+m2)V

7 0
3 years ago
A car has an initial velocity of 11.2 m /sec. the car accelerates at 10.0 m /s2 for 8.0 seconds. what is the velocity of the car
Vinil7 [7]
Initial velocity(u) = 11.2 m/s.
Final velocity(v) = ?
acceleration(a) = 10.2 m/s²

Using kinematic equation v = u + at

v = 11.2 + 10 x 8 = 11.2 + 80 = 91.2 m/s.

Therefore final velocity is 91.2 m/s.
7 0
3 years ago
7)
REY [17]
Hello,

The answer is A) a mixture. An element as defined as a pure substance, that cannot be broken down and most are typically naturally occurring. A compound occurs in chemical bonding. A substance is either a pure element or compound.
8 0
3 years ago
Which statement correctly describes these electric field lines?
Otrada [13]
I don’t know, which statement ahh I see white screen lol
4 0
3 years ago
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