Mean Life: The half-life of tritium is 12.3 y. What is its mean life (time constant)?
Fill in the blank(s) with the appropriate word(s).
17.7 y
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A block (mass mA) lying on a fixed frictionless inclined plane is a mass ma by a cord passing over a pulley, as shown in Fig. 4-54.
(a) Determine a formula for the acceler ation of the system in terms of mA, mB, ?, and g,
(b) What conditions apply to masses mA and mp for the acceleration to be in one direction (say, ma down the plane), or in the opposite direction? Ignore the mass of the connected to cord and pulley.
In what sense is our modern concept of an "atom" not accurate to its ancient meaning?
A) "Atom" means indivisible, but we now know that atoms are actually made of smaller particles. B) "Atom" means particle, but we now know that particles also have the properties of waves. C) "Atom" means identical, but we now know that not all atoms are the same. D) "Atom means solid, but we now know that atoms are mostly empty space.
A 420-turn circular coil with an area of 0.0650 m2 is mounted on a rotating frame, which turns at a rate of 22.3 rad/s in the presence of a 0.0550-T uniform magnetic field that is perpendicular to the axis of rotation. What is the instantaneous emf in the coil at the moment that the normal to its plane is perpendicular to the field?
a. 33.5 V b. zero c. 0.0673 V d. 747 V e. 1.50 V
A water tank is filled to a depth of 10 m, and the bottom of the tank is 20 m above ground. A water-filled hose that is 2.0 cm in diameter extends from the bottom of the tank to the ground, but no water is flowing in this hose
The water pressure at ground level in the hose is closest to which of the following values? The density of water is 1000 kg/m3. A) 3.9 × 105 N/m2 B) 2.0 × 104 N/m2 C) 9.2 N/m2 D) The question cannot be answered because the cross sectional area of the tank is needed.