In a design using the aluminum alloy 7075-T6, would it be safe to assume that a part could withstand an infinite number of stress applications that are only 50 % of the yield stress? _________
Fill in the blank(s) with the appropriate word(s).
no
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In the terminology a 500-N block, the 500-N refers to the block's:
a. mass. b. force. c. weight. d. None of the above.
Mercury, the closest planet to the Sun, has an orbital period that is
1.greater than that of all of the other planets. 2.less than that of all of the other planets. 3.greater than that of some of the planets and less than that of others. 4.equal to one Earth year.
What makes us think that Mars must once have had an atmosphere that was warmer and had higher surface pressure?
A) We think it for purely theoretical reasons, based on calculations showing that the Sun has brightened with time. B) The atmosphere is too cold and thin for abundant liquid water today, yet we see evidence of large areas of flowing water in the past. C) The presence of inactive volcanoes on Mars tells us that there must once have been a lot of outgassing, and hence a thicker atmosphere. D) The fact that parts of Mars have a lot of craters tells us that Mars must once have been much warmer.
A 20-ton truck collides with a 1500-lb car and causes a lot of damage to the car
A) The force of collision on the truck is greater then the force of collision on the car. B) The force of collision on the truck is equal to the force of collision on the car. C) The force of collision on the truck is smaller than the of collision force on the car. D) The truck did not slow down during the collision. E) The car did not slow down during the collision.