Answer:
it gives off a range of electromagnetic radiation of shorter wavelengths.
Explanation:
I took the test
Answer:
A. The box experiences more friction on the carpeted floor
Explanation:
Friction is the force that opposes the motion of an object when it slides along a surface. The magnitude of the friction is given by

where m is the mass of the object, g is the acceleration due to gravity, and
is the coefficient of friction, which depends on the type of material of the surface: the larger this coefficient, the stronger the friction, the more difficult is to push the box along the surface. Generally, a smooth surface has a lower coefficient of friction, while a rough surface has a larger coefficient of friction.
In this case, Ethan find it easier to push the box on the marble floor, because marble is smoother than the carpet and so friction is weaker, while for the carpeted floor the coefficient of friction is larger and so the friction is stronger, making it more difficult to push the box.
A)
2revs in 0.08s
so in 1s thats 25revs
therefore thats <u>50π radians</u> in one second
b)
well, ω=2π/T
therefore ω=50π = 157.079rads^-1
and v=rω where r is in meters;
v=0.3x157.079
<u>v=47.123ms^-1</u>
c)
f=1/T
f=1/period for one rotation
1 rotation = 0.08/2 = 0.04
f=1/0.04
<u>f=25Hz</u>
One common source of background radiation would be radon. It is a radioactive gas<span> that emanates from the ground. </span><span>It is usually found in igneous rock and soil. Hope this answers the question. Have a nice day. Feel free to ask more questions.</span>
Answer:1.624 m
Explanation:
Given
height of 2nd floor =5 m
time recorded is 0.58 sec
Let h be the height of third floor above 2 nd floor

here u=0
t=time taken to cover height h
----------1
Now time taken to complete whole building length
----------2
Subtract 1 form 2

Taking gravity 
1=(2t+0.58)(0.58)
t=0.57 s
Substitute the value of t in 1
h=1.624 m