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Sav [38]
2 years ago
10

What is also known as a ferromagnetism

Physics
1 answer:
Aleks [24]2 years ago
6 0

Answer:

Iron, nickel, cobalt and some of the rare earths (gadolinium, dysprosium) exhibit a unique magnetic behavior which is called ferromagnetism because iron (ferrum in Latin) is the most common and most dramatic example.

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There is a 50 g sample of Ra-229. It has a half-life of 4 minutes.
Sloan [31]

Via half-life equation we have:


A_{final}=A_{initial}(\frac{1}{2})^{\frac{t}{h} }


Where the initial amount is 50 grams, half-life is 4 minutes, and time elapsed is 12 minutes.  By plugging those values in we get:

A_{final}=50(\frac{1}{2})^\frac{12}{4}=50(\frac{1}{2})^{3}=50(\frac{1}{8})=6.25g


There is 6.25 grams left of Ra-229 after 12 minutes.

4 0
3 years ago
The spring constant for the spring in above Table is 20 N/m.
satela [25.4K]
The answer is 0.025J.

W=1/2*k*x^2
W=1/2*20*0.050^2
W=0.025J
5 0
2 years ago
With respect to the earth, object 1 is moving at speed 0.80 c to the right. Object 2 is moving in the same direction at speed 0.
viktelen [127]

Answer:

0.976 c

Explanation:

v_{1e} = velocity of object 1 relative to earth = 0.80 c

v_{21} = velocity of object 2 relative to object 1 = 0.80 c

v_{2e} = velocity of object 2 relative to earth

Velocity of object 2 relative to earth is given as

v_{2e}= \frac{v_{1e} + v_{21}}{1 + \frac{v_{1e}v_{21}}{c^{2}}}

v_{2e}= \frac{0.80 c + 0.80 c}{1 + \frac{(0.80c)(0.80c)}{c^{2}}}

v_{2e} = 0.976 c

6 0
2 years ago
PLEASE HURTY FAT ON QUIZ ATM!!!! 25 POINTS!!!!!! A student pushes a 40-N walk across the floor for a distance of 10 m how much w
algol13
Work is force times distance, so W = 40 N * 10 m = 400 J
8 0
2 years ago
Striking a fixed object at 60 MPH is the same as falling from a _____ story building:
yulyashka [42]

speed of the striking object is given as

v = 60 mph

now this speed in SI units given as

v = 60 \times \frac{1609 m}{3600 s}

v = 26.82 m/s

So here we can use kinematic now to find the height from where it is dropped

so here we will have

v_f^2 - v_i^2 = 2 a d

now we have

v_f = 26.82 m/s

v_i = 0

a = 9.81 m/s^2

now from above equation

26.82^2 - 0 = 2(9.81)d

d = 36.67 m

now we know that average height of 1 story building is 3 meter

so approx total number of stories in the building will be

N = \frac{36.67}{3} = 12 story

6 0
2 years ago
Read 2 more answers
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