Two blocks with masses 2.0 kg and 3.0 kg are placed on a horizontal frictionless surface. A light spring is placed in a horizontal position between the blocks. The blocks are pushed together, compressing the spring, and then released from rest. After contact with the spring ends, the 3.0-kg mass has a speed of 2.0 m/s. How much potential energy was stored in the spring when the blocks were
released?
a. 15 J
b. 3.0 J
c. 6.0 J
d. 12 J
e. 9.0 J
a
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A box is pushed eastward across a rough horizontal floor by a force acting parallel to the floor. A force providing an impulse directed westward on the body is
A. a fictitious force. B. the applied force. C. normal reaction force of floor upward on body. D. friction. E. gravity.
All minerals exhibit cleavage.
a. true b. false
What evidence supports the assumption that a large number of living species disappeared about 65 million years ago due to a catastrophic impact?
A. the Chicxulub crater B. the existence of a thin iridium layer of comparable geological age C. the existence of a thin layer of soot of comparable geological age D. All of these choices are correct.
Which of the following is a carbohydrate?
a. Maltose b. Glycine c. Ribonucleic acid d. Glyceryl tristearate