According to the present estimates, the Universe is about ________ years old.
A. 14 × 105
B. 14 × 107
C. 14 × 1011
D. 14 × 109
Answer: D
You might also like to view...
A centrifuge takes 100 s to spin up from rest to its final angular speed with constant angular acceleration. A point located 8.00 cm from the axis of rotation of the centrifuge moves with a speed of 150 m/s when the centrifuge is at full speed
(a) What is the average angular acceleration of the centrifuge as it spins up? (b) How many revolutions does the centrifuge make as it goes from rest to its final angular speed?
An isolated, charged conductor is in electrostatic equilibrium. Which statement is correct? a. The net charge is never zero inside the conductor
b. The electric field is always zero just outside the conductor. c. The charge density on the conductor's surface is greatest where the surface is sharpest. d. None of these statements are correct.
In age, Population I stars are typically much ________ than those of Population II
Fill in the blank(s) with correct word
A Carnot heat engine and an irreversible heat engine both operate between the same high temperature and low temperature reservoirs. They absorb the same energy from the high temperature reservoir as heat. The irreversible engine:
A. does more work B. transfers more energy to the low temperature reservoir as heat C. has the greater efficiency D. has the same efficiency as the reversible engine E. cannot absorb the same energy from the high temperature reservoir as heat without violating the second law of thermodynamics