A ball with diameter 10. cm rolls without slipping on a horizontal table top. The moment of inertia of the ball is 2.2 × 10-3 kg- m2 and its translational speed is 0.45 m/s
(a) What is its angular speed about its center of mass? (b) What is its rotational kinetic energy? (c) What is its angular momentum?
(a) 9.0 rad/s
(b) 0.089 J
(c) 0.020 J ? s
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One star has a temperature of 10,000 K and another star has a temperature of 5,000 K. Compared to the cooler star, how much more energy per second will the hotter star radiate from each square meter of its surface?
a. 16 times b. 2 times c. 1 × 10^16 times d. 625 times e. 25 times
Briefly explain how an impact event 65 million years ago could have caused the extinction of the dinosaurs
What will be an ideal response?
The mass of a neutron is ________ the combined mass of a proton and an electron
A) less than B) equal to C) more than
Each atom in a mole of water vapor (H2O) has one electron removed. What is the total charge of the ionized gas?
A. 96 kC B. 290 kC C. 600 kC D. 190 kC