It is easier to roll a barrel full of coal tar than to pull it because
Options: the full weight of the barrel comes into play when it is pulled, the rolling friction is much less than the sliding friction, more surface area of the barrel is in contact with the road when it is pulled, coal tar is a liquid and it flows in the barrel when it is rolled
Which of the following events took place in the Cenozoic era?
Options: Formation of the rockies, India collides with Asia and the formation of the Himalayas and the Alps, Formation of the Appalachians and central European mountains, Splitting of India from Antarctic, Breaking up of Pangaea
The Manhattan Project was started by President Roosevelt in 1942 to ensure that the U.S. beat the Germans in developing a nuclear bomb. Whom did Roosevelt appoint as scientific head the Manhattan Project?
Options: Robert Oppenheimer, James B. Conant, Leslie R. Groves, Vannevar Bush