A ball rolls over the edge of a platform with only a horizontal velocity. The height of the platform is 1.6 m and the horizontal range of the ball from the base of the platform is 20 m
What is the horizontal velocity of the ball just before it touches the ground? Neglect air resistance. A) 35 m/s
B) 9.8 m/s
C) 20 m/s
D) 4.9 m/s
E) 70 m/s
A
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The variation in the pressure of helium gas, measured from its equilibrium value, is given by DP = 2.9 × 10^-5 cos (6.20x - 3 000t) where x and t have units m and s, and DP is measured in N/m2 . Determine the frequency (in Hz) of the wave
a. 1 500 b. 477 c. 1.01 d. 0.32 e. 239
Electrical and gravitational forces follow similar equations with one main difference:
A) Electrical forces obey the inverse square law and gravitational forces do not. B) Gravitational forces obey the inverse square law and electrical forces do not. C) Electrical forces attract and gravitational forces repel. D) Electrical forces repel and gravitational forces attract. E) Gravitational forces are always attractive but electrical forces can be attractive or repulsive.
Which of the following statements is true of white dwarfs?
A) Some of them are among the hottest stars known. B) Few of them are positioned in the upper-right corner of the Hertzsprung-Russell (H-R) diagram. C) They have high luminosities. D) They have a very big surface area from which they radiate energy.
A cylindrical space colony 13 km in diameter and 30 km long has been proposed as living quarters for future space explorers. Such a habitat would have cities, land, and lakes on the inside surface and air and clouds in the center. All this would be held in place by the rotation of the cylinder about the long axis. How fast would such a cylinder have to rotate at its perimeter to produce a 1-g
gravitational field at the walls of the cylinder? a. 200 m/s c. 650 m rad/s b. 250 m/s d. 800 m rad/s