Radioactivity in the Earth leads to
A. energy for volcanoes
B. helium for toy balloons
C. heat for geysers
D. all of the above
Ans: D. all of the above
You might also like to view...
A charged particle is moving in a magnetic field. What is the direction of the force on the particle due to the magnetic field?
a) in the direction of the magnetic field b) in the direction opposite to which the particle is moving c) in the direction that is perpendicular to both the magnetic field and the velocity d) in the same plane as the magnetic field and the velocity, but not in either of those two directions e) in the direction of motion
A proton is accelerated from rest through a potential difference of 150 V. It then enters a region of uniform magnetic field and moves in a circular path (radius = 12 cm). What is the magnitude of the magnetic field in this region?
A. 18 mT B. 12 mT C. 15 mT D. 22 mT E. 10 mT
A Martian meteorite has revealed carbonate rocks and microfossils
Indicate whether the statement is true or false
Buoyancy: As a rock sinks deeper and deeper into water of constant density, what happens to the buoyant force on it if it started above the surface of the water?
A. The buoyant force keeps increasing steadily. B. The buoyant force remains constant. C. The buoyant force first increases and then remains constant. D. The buoyant force steadily decreases.