A weather balloon is held stationary by a tether. The upthrust on the balloon is 90 N upwards and its weight is 60 N downwards. The wind exerts a horizontal force of 24 N eastwards. The tether pulls on the balloon downwards and westwards.
Calculate the vertical and horizontal components of the force exerted by the tether on the balloon.
The wind force suddenly increases to 30 N eastwards.
Calculate the resultant force on the balloon at the instant the wind force increases, before the tether force has changed.