Example 1.2
A man wishes to travel due north in order to cross
niver Skin wide flowing due cast at 3 kmhur i he
can now at 10 kmhrl in still water. Find outher
scale drawing or by calculation:
(1) the direction in which he must head his boat
in order to get to his destination directly
opposite his starting point,
the resultant velocity of the boat in the river,
(ii) the time taken to cross the river,
(iv) how far from his destination he would land if
he ignorantly steers northwards

The answer is b hope this

The sunlight shines uv radiation on earth,a microwave oven radiates waves on food

To compare speeds speeds of wagons we will use second newton's law. it states: f = m * ahere we can see that force depends on the acceleration. if we know acceleration for both wagons we can compare them to make conclusion of speeds of wagons.we have: m1 = 10lbm2 = 20lbf1 = 2*f2also: m2 = 2*m1for bill we have equation: f1 = m1 * a1for tom we have equation: f2 = m2 * a2after inserting identities we have: 2*f2 =m1 * a1f2 = 2*m1 * a2in order to make conclusions about speeds we will solve these equations for a and find their ratio: a1 = 2f2 / m1a2 = f2 / 2m1a1 / a2 = (2f2/m1) / (f2/2m1)a1 / a2 = (2f2*2m1) / (m1*f2)a1 / a2 = (4f2m1) / (m1f2)a1 / a2 = 4this ratio is bigger than 1 and this means that a1 is greater than a2. a1 is 4 times greater than a2. speed of bill's wagon is 4 times greater than speed of tom's wagon.