I'm going to quote something that might help you...
"The Doppler effect is the apparent change in the frequency of a wave motion when there is relative motion between the source of the waves and the observer. Well known examples include the change in pitch of an ambulance or police siren, as it approaches and then recedes from you, or the same effect from a passing train."
This is not mine I am simply quoting something that might help you.
Answer:
the measured charge will be -2 elementary charges.
Explanation:
Problem 2
Answer: Choice D only
Explanation:
Let's go through the list of possible answers
- A) She only would feel a force pulling her toward the chair, hence making her feel heavier, only when the space ship is accelerating faster. In this case, she is moving a constant speed of 0.5c (aka half the speed of light). Despite going this fast, she is moving at a constant speed and therefore not accelerating at this current time. The speed isn't changing. Therefore, she would not feel a force pushing her into the chair. Choice A is off the list.
- B) This is also off the list as well. The lack of accelerating force means her lungs aren't compressed and breathing should be normal. This is assuming she doesn't have any medical conditions hindering her breathing. We can cross choice B off the list.
- C) This is similar to choice B. We can cross it off the list.
- D) The faster you go, the more time dilation will occur. This effectively compresses time and makes it slow down. The more detailed explanation involves relativity which is very complicated. Therefore, choice D is the answer.
- E) This is false because choice D was mentioned to be true.
The sun crosses the plane of Earth's equator when the center of
the sun coincides with either of the two points on the map of the
sky labeled "equinox".
One of the following two phenomena occurs at that time, depending
on the direction in which the sun crosses the plane.
1). People all over the northern hemisphere shout and exclaim "It's Spring!",
whereas those in the southern hemisphere yell "It's autumn now.".
2). People all over the northern hemisphere yell "It's Autumn now.", whereas
those in the southern hemisphere shout and exclaim "It's Spring !".
Answer:
W = 2.5*10⁻⁴ J (by me)
Explanation:
μy = 5.0 x 10⁻⁴ A·m²
By = 0.5 T
∅ = 0º
If
μx = 5.0*10⁻⁴ A·m²
By = 0.5 T
∅ = 90º
We get ΔU as follows
ΔU = Uf - Ui
Ui = - μy*By*Cos ∅ = - 5.0*10⁻⁴ A·m²*0.5 T*Cos 0º = - 2.5*10⁻⁴ J
Uf = - μx*By*Cos ∅ = - 5.0*10⁻⁴ A·m²*0.5 T*Cos 90º = 0 J
Finally we use the equation
W = - ΔU = - (0 - (- 2.5*10⁻⁴)) J = - 2.5*10⁻⁴ J (by the field)
W = 2.5*10⁻⁴ J (by me)