If the average density of the universe is less than the critical density, the Universe is open
a. True
b. False
Indicate whether the statement is true or false
True
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A sunken steel ship has a mass of 500,000 kg. It is filled with water. In order to lift the ship, air bags are to be inflated inside the hull. What volume of air is needed if 7.8 is the specific gravity of steel?
A) 1266 m3 B) 436 m3 C) 872 m3 D) 225 m3 E) 2778 m3
The value of the dot product of two vectors depends on the particular coordinate system being used
A) True B) False
A very small 51-g steel ball is released from rest and falls vertically onto a steel plate. The ball strikes the plate and is in contact with it for 0.50 ms. The ball rebounds elastically (at the same speed) and returns to its original height
The total time interval for a round trip is 3.00 s. What is the magnitude of the average force exerted on the ball by the plate during contact with the plate? A) 3000 N B) 1500 N C) 2490 N D) 2000 N E) 3500 N
In a museum exhibit of a simple pendulum, a very small but dense 6.0-kg ball swings from a very light 2.5-m wire
The ball is released from rest when the pendulum wire makes a 65° angle with the vertical, and it swings in a circular arc with no appreciable friction or air resistance. What is the tension in the wire just as the ball swings through its lowest position? A) 11 N B) 59 N C) 68 N D) 130 N E) 0 N