In a police ballistics test, a 2.00-g bullet suddenly hits and becomes embedded in a 5.00-kg wood block which is hanging from a 1.20-m long string. This causes the block to swing through an arc of 3.50°
What was the speed of the bullet just before it hit the block? A) 16.7 m/s
B) 524 m/s
C) 25.3 m/s
D) 262 m/s
E) 789 m/s
B
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On Earth the starting point of longitude is Greenwich, England. On the celestial sphere, what is the starting point of the right ascension?
Autumnal Equinox Vernal Equinox Summer solstice Winter solstice
A box is placed on a table which rests on the floor. The box pushes on the table; the Newton's third law pair to the the box's push on the table is the table's push on the floor
A) True B) False
A carpenter is driving a 15.0-g steel nail into a board. His 1.00-kg hammer is moving at 8.50 m/s when it strikes the nail. Half of the kinetic energy of the hammer is converted into internal energyin the nail and does not flow out of the nail
What is the increase in temperature of the nail after the three blows that the carpenter needs to drive the nail in completely? The specific heat of steel is 448 J/kg ? K. A) 8.1 K B) 3.6 K C) 1.8 K D) 2.7 K E) 7.7 K
A baseball is struck by a bat. While the ball is in the air, what objects exert forces on the ball?
1.Earth 2.Bat 3.Air 4.Bat, Air 5.Earth, Bat 6.Earth, Air 7.Earth, Bat, Air 8.There are no forces on the ball. 9.The answer depends on whether the ball is going up, going down, or at its highest point.