A sprinter is moving to the right and only one foot is touching the ground. The sprinter’s foot pushes back on the ground horizontally with a force of 300N and down vertically with a force of 750N. The mass of the sprinter is 50 kg. We will define upward vertical as positive and rightward horizontal as positive.

a) Draw a free body diagram of the sprinter showing all external forces acting on the sprinter.

b) What is the resultant of the force that the ground applies to the sprinters foot? Hint: it is equal and opposite to the force that the foot applies to the ground.

c) What are the net horizontal and vertical forces acting on the sprinter?

d) If the mass of the sprinter is 50 kg, what are the net horizontal and vertical accelerations of the sprinter’s center of gravity?

Ok i am attempting to my niece attach a galvanized wire (like a tether for a dog) at the corner of two fences, making a tightwire if you will and we drilled a hole in a softball and she hits it. the ? and problem is that we can not get the wire taunt enough where it doesnt sag after hitting the ball once, and the wire sags and wobbbles. its a 15 ft rubber covered galvanized wire and one can adjust the length of the placing of the wire by having it make the corner of 2 fences become a it can be adjusted, however, with all our human strength and pliers we could not make it taunt as possible. is there anything other that attaching it to a car to do this. sorry abt the length but it would mean the world to my niece if i could solve this came up with the entire idea herself, and she is 14 and paid for the wire and did as much work as i did drilling a hole through a softball wide enough for attaching piece at each end of the wire that clips on to the fence. . any ideas welcome if serious. but awesome if it is a fact. much obliged. bucky bukowski buckman

What is the maximum acceleration of the wing tips, in units of g?

The image below shows numerous volcanic mountains in the pacific northwest. what is the most likely cause of the volcanic and earthquake activity in this region?