Rotational Kinetic Energy: A ball in the shape of a uniform spherical shell (like a soccer ball) of mass 1.5 kg and radius 15 cm rolls down a 35° incline that is 6.0 m high, measured vertically. The ball starts from rest, and there is enough friction on the incline to prevent slipping of the ball.(a) How fast is the ball moving forward when it reaches the bottom of the incline, and what is its angular speed at that instant?(b) If there were no friction on the incline, how fast would the ball be moving forward and what would be its angular speed at the bottom?
What will be an ideal response?
(a) 8.4 m/s, 56 rad/s (b) 11 m/s, 0 rad/s
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__________ is the concentration of natural drainage channels in a given area.
What will be an ideal response?
What is the formula of a compound formed from the ions M1+ and X3-?
a. M3X b. MX3 c. MX d. None of these
The pupil of a cat's eye narrows to a slit of width 0.5 mm in daylight. Assuming a wavelength of 500 nm, what is the angular resolution? (1 nm = 10?9 m)
a. 1 × 10^?3 rad b. 5 × 10^?3 rad c. 1 × 10^?4 rad d. 5 × 10^?4 rad e. 2.5 × 10^?4 rad
Conservation of Momentum: A 60-kg swimmer suddenly dives horizontally from a 150-kg raft with a speed of 1.5 m/s. The raft is initially at rest. What is the speed of the raft immediately after the diver jumps if the water has negligible effect on the raft?
Fill in the blank(s) with the appropriate word(s).