The drawing shows a large cube (mass = 23.0 kg) being accelerated across a horizontal frictionless surface by a horizontal force P. A small cube (mass = 3.7 kg) is in contact with the front surface of the large cube and will slide downward unless P is sufficiently large. The coefficient of static friction between the cubes is 0.710. What is the smallest magnitude that P can have in order to keep the small cube from sliding downward