If the density of the universe is greater than the critical density, this means that:
A) the universe is expanding at a rate equal to the escape speed of the universe.
B) the universe is expanding at a rate less than the escape speed of the universe.
C) the universe is expanding at a rate greater than the escape speed of the universe.
D) the universe is expanding at a rate equal to the speed of light.
E) the universe is expanding at a rate greater than the speed of light.
B
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A boson has half integral spin
Indicate whether the statement is true or false
An ideal gas has a pressure of 2.5 atm, a volume of 1.0 L at a temperature of 30°C. How many molecules are there in this gas? (R = 8.31 J/mol ? K, 1.00 atm = 101 kPa, NA = 6.022 × 1023)
A) 6.1 × 1023 B) 6.0 × 1022 C) 2.4 × 1022 D) 2.3 × 1023
A very dense 1500-kg point mass (A) and a dense 1200-kg point mass (B) are held in place 1.00 m apart on a frictionless table
A third point mass is placed between the other two at a point that is 20.0 cm from B along the line connecting A and B. When the third mass is suddenly released, find the magnitude and direction (toward A or toward B) of its initial acceleration. (G = 6.67 × 10-11 N ? m2/kg2)
A 1.6-kg ball is attached to the end of a 0.40-m string to form a pendulum. This pendulum is released from rest with the string horizontal. At the lowest point of its swing, when it is moving horizontally, the ball collides with a 0.80-kg block initially at rest on a horizontal frictionless surface. The speed of the block just after the collision is 3.0 m/s. What is the speed of the ball just
after the collision? a. 1.7 m/s b. 1.1 m/s c. 1.5 m/s d. 1.3 m/s e. 2.1 m/s