Aladder 16 m. long rests against a frictionless wall and makes a angle of 60° with the horizontal. a 180 n. man is on the ladder, m t the top. what horizontal force is needed at the bottom of the ladder in on to prevent. the ladder from slipping? neglect the weight of the ladder.

What is the earliest point in the universe that we can observe? why can’t we see back further than this?

How does the amount of energy required to hold each proton and neutron in the nucleus compare to the energy released when they are removed?

Two conductors, a and b, are each in the shape of a tetrahedron. but of different sizes. they are charged in the following manner: 1. tetrahedron a is charged from an electrostatic generator to charge q. 2. tetrahedron a is briefly touched to tetrahedron b. 3. steps 1 and 2 are repeated until the charge on tetrahedron b reaches a maximum value. if the charge on tetrahedron b was q/4 after the first time it touched tetrahedron a. what is the final charge qbmax on tetrahedron b?