I am assuming that the distances L1 and L2 represent the distances from the persons cg and feet, and cg and hands, respectively??pmd28 said:Homework Statement
a person (weight W = 590 N, L1 = 0.830 m, L2 = 0.409 m) doing push-ups. Find the normal force exerted by the floor on each hand and each foot, assuming that the person holds this position.
Homework Equations
Xcg= (W1X1 + W2X2)/(W1+W2)
τ=Fl
The Attempt at a Solution
I tried solving for W1 in terms of W2 but that got me no where. I can't figure out how to resolve two varibles with one equation.
PhanthomJay said:I am assuming that the distances L1 and L2 represent the distances from the persons cg and feet, and cg and hands, respectively??
Yes, that would be just one of the forces creating torque about your chosen point, provided that your chosen point is not the cg, in which case it creates no torque. You can choose any point you want to solve for torques about that point; the sum of the torques of all forces about that point, and the sum of all forces, must be zero for the equilibrium condition.pmd28 said:would my F in torque be W=509?
A person doing a pushup starts by lying facedown on the ground with their hands shoulder-width apart and their toes touching the ground. They then push their body up using their arms and core muscles until their arms are fully extended. Finally, they lower their body back down until their chest touches the ground, and repeat the motion.
A pushup primarily works the chest, shoulders, triceps, and core muscles. It also engages the back, biceps, and legs to a lesser extent.
The number of pushups a person should do in a set depends on their fitness level and goals. Generally, beginners can start with 10-15 pushups per set and work their way up to 20-30. Advanced individuals may be able to do 50 or more pushups in a set.
Yes, pushups can help build muscle, especially in the chest, shoulders, and triceps. However, for significant muscle growth, it is important to incorporate a variety of exercises and to continually challenge the muscles with increasing intensity and resistance.
Pushups can be a beneficial exercise for most people, but it may not be suitable for everyone. People with wrist, shoulder, or back injuries or conditions may need to modify the exercise or avoid it altogether. It is always recommended to consult with a doctor or certified personal trainer before starting any new exercise routine.