3 A student is investigating the pressure that a block of wood is exerting on the floor. The weight of the wood is 20 N. The block is 10 cm long, 5 cm wide and 2 cm high.
a What is the biggest pressure that the block can exert on the floor?

What happens to the velocity of the car when the upward pull of the cable is greater than the downward pull of gravity as the car rises toward the top?

The junction rule describes the conservation of which quantity? note that this rule applies only to circuits that are in a steady state.

An alpha particle with kinetic energy 12.5 mev makes a collision with lead nucleus, but it is not "aimed" at the center of the lead nucleus, and has an initial nonzero angular momentum (with respect to the stationary lead nucleus) of magnitude l = p0 b, where p0 is the magnitude of the initial momentum of the alpha particle and b=1.40×10−12 m. (assume that the lead nucleus remains stationary and that it may be treated as a point charge. the atomic number of lead is 82. the alpha particle is a helium nucleus, with atomic number 2.) what is the distance of closest approach?