We can simply find components of the given directions and conveniently add them up to find the total distance.
290 km 20 deg north of east can be decomposed as :
290 x cos(20) EAST + 290 sin(20) NORTH
=272.5 E + 99.18 N
Now from this point ,
170 Km 30 deg west of north :
170 cos(30) N - 170 sin (30) E [ east = - west]
= 147.22 N - 85 E
hence coordinates of lake b are
(272.5 - 85) E + (99.18 + 147.22)N
187.5 E +264.4 N
use right triangle property to find distance D = 
D = 324.13 Km
and angle = atan(b/a) = 54.65 deg
hence lake b is at 324.13 Km 54.65 deg east of north
First of all, we can calculate the frequency of the photon, which is related to the wavelength by the following equation:

where c is the speed of light and

is the photon wavelength. Substituting into the formula, we find the frequency

Now we can find the energy of the photon with the following equation:

where h is the Planck constant. Substituting numbers, we find
Answer:
The correct answer is <u>option (A) that is KEA > KEB .</u>
Explanation:
Let us calculate -
If the object is straighten up and inclined plane , the work done is


The change in kinetic energy is ,

At the top of the inclined plane , the velocity is zero
So,


From the work energy theorem , we have
in case of friction , so


For object A-

For object B


Thus , larger mass is going to mean less total work and a lower kinetic energy .
From the above results , we get

<u>Therefore , option A is correct .</u>
PE = mgh
Mass, m = 7kg, g ≈ 10 m/s², height = 2m
= 7*10*2
= 140 Joules.
Answer:
ответ 1.25 × 10‐³ и вот ваш ответ