Jim stands beside a wide river and wonders how wide it is. He spots a large rock on the bank directly across from him. He then walks upstream d = 65 strides and judges that the angle between him and the rock, which he can still see, is now at an angle of 30∘ downstream. Jim measures his stride to be about 0.8 m long.
+12531
Guest
17 mins ago
Jim stands beside a wide river and wonders how wide it is. He spots a large rock on the bank directly across from him. He then walks upstream d = 65 strides and judges that the angle between him and the rock, which he can still see, is now at an angle of 30∘ downstream. Jim measures his stride to be about 0.8 m long.
+12531
Guest
17 mins ago
Jim stands beside a wide river and wonders how wide it is. He spots a large rock on the bank directly across from him. He then walks upstream d = 65 strides and judges that the angle between him and the rock, which he can still see, is now at an angle of 30∘ downstream. Jim measures his stride to be about 0.8 m long.
