The Big Red (11-12, 3-3) opened the game with a 12-2 run. Dartmouth (6-14, 2-4) trimmed the deficit to 12-7, but a 3-pointer by Cressler sparked a 17-5 spurt.
Cornell stretched its lead to 24, 41-17, on Peck's layup with 2:15 left in the first half and led by at least 18 points after halftime.
The Big Red made 17 of 27 shots in the opening frame while Dartmouth made as many shots (7 of 28) as turnovers.
Tyler Melville's 12 points led the Big Green.
Former Kentucky guard Ed Davender, the only Wildcat with at least 1,500 points and 400 assists, has died. He was 49.
Guard Naz Mitrou-Long, whose 2015-16 season ended in December due to hip problems, has been granted a hardship waiver for the coming season, Iowa State said.
As the Sooners look to life without superstar Buddy Hield and his sidekicks, it's clear their unseasoned players will need to grow up fast.