times the size of the object and..? An object is placed 4.5 cm from a convex lens.The size of the image is four times the size of the object and is formed at the same side of the object.Calculate the focal length of the lens.
ANSWER
6.0cm
HOW TO DO????
bag weighing 50N.The angle between...? Jack and Jill carried a heavy bag.They each exert a force,T to carry the bag weighing 50N.The angle between the forces is 40 degrees.What is the magnitude of T?
answer:26.6N
how do u get the answer i do not understand help very much appreciated