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salantis [7]
3 years ago
7

Students in a lab are doing experiments involving the motion of objects. They pull an object across a table and use

Physics
1 answer:
Svetlanka [38]3 years ago
5 0

Answer:

Explanation:

Did you ever end up getting an answer? Or like did you find out which segment it was?

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What speed must an electron have if its momentum is to be the same as that of an x-ray photon with a wavelength of 0.20 nm?
Nat2105 [25]
The momentum of a photon is given by the following relationship:
p= \frac{h}{\lambda}
where
h is the Planck constant
\lambda is the photon wavelength

For the photon in our problem, \lambda=0.20 nm = 0.20 \cdot 10^{-9}m, so its momentum is
p= \frac{h}{\lambda}= \frac{6.6 \cdot 10^{-34} Js}{0.20 \cdot 10^{-9} m}=3.3 \cdot 10^{-24} kg m/s

The electron must have the same momentum of this photon, and its momentum is given by (in the non-relativistic approximation)
p=mv
where
m is the electron mass
v is its speed

Re-arranging this formula, we can calculate the electron speed:
v= \frac{p}{m}= \frac{3.3 \cdot 10^{-24} kg m/s}{9.1 \cdot 10^{-31} kg} =3.6 \cdot 10^6 m/s

And this velocity is quite small compared to the speed of light (c=3 \cdot 10^8 m/s), so the non-relativistic approximation that we used for the electron's momentum is valid.
8 0
3 years ago
Newton’s second law: Force equals mass times acceleration (__=___).
DIA [1.3K]
F n = ma / unbalanced force - In the direction of the force.
7 0
3 years ago
The 80.0-lb boy at a is suspended from the cable that passes over the quarter circular cliff rock. determine if it is possible f
IrinaVladis [17]
<span>Yes, it's possible to hoist the child up. Let's first determine the maximum amount of pull that the woman can exert. That will be the simple product of her weight and the coefficient of static friction with her shoes and the ground. So 0.8 * 190 = 152. So far, so good, since 152 is greater than the boy's 80 lbs. But the cable rubs at the cliff edge and that means that the lady has to pull harder. Let's see how much harder. There will be 80 lbs of tension on the cable, pressing against the cliff edge. So let's multiply by the coefficient of friction to get how much that is 0.2 * 80 = 16 So friction will take 16 lbs of effort to overcome. So the lady needs to pull with 80 + 16 = 96 lbs of force to move the boy. And since we've determined earlier that she can pull with up to 152 lbs of force, she can easily hoist the child up.</span>
4 0
3 years ago
_________ is a change in the position of a body with respect to time relative to a reference point.
rjkz [21]

Answer:

Rest

Explanation:

Rest is a change in the position of a body with respect to time relative to a reference point. The stationary state of an object or body relative to a reference position or another object is called Rest.

Taking Newton's First Law of motion into consideration, an object will remain in its state of rest or uniform motion until acted upon by an external force. This implies an object at rest is an object with zero (without) velocity and acceleration.

8 0
3 years ago
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What are two deposit s made by water
Alexandra [31]
Sinkholes and caves are 2 reasons.  hope that helped
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