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- An astronaut leaves earth and travels at 0.92c. He spends 15 years exploring space. When he returns, how much time will have passed on Earth?
open end downwards into mercury until the length of the enclosed air
column is 84cm. with the aid of a diagram, find the depth of immersion of
the tube in the mercury if the atmospheric pressure is 77cm of mercury
By applying Hund's rule, the ground state of Yb+3 and Tb+3 is:
2F7/2 and 7F6
2F5/2 and 7F5/2
2F6 and 7F6
2F7/2 and 7F3/2
2 points
The molar diamagnetic susceptibility of atomic hydrogen is
A) −2.3×10−6cm3/mole
B) −4.6×10−6cm3/mole
C) 2.3×10−6cm3/mole
D) 4.6×10−6cm3/mole
The wave function of the hydrogen atom in its ground state (1s) is
ψ=(πa03)−12exp(−ra0 where
a0=0.529×10−8 cm. The charge density is
ρ(x,y,z)=−e|ψ|2, according to the statistical interpretation of the wave function.
Then the value of ⟨r⟩
⟨r⟩ is given by
a) 5a02
b) 2a02
c) 4a02
d) 3a02
A ball is thrown horizontally from the rooftop of a 150 m high building. If the ball
landed 17.5 m from the base of the building, what is the initial speed of the ball.
A = 50 N @ 30 degrees N of E
B = 110 N @ 40 degrees N of W
C = 75 N @ 60 degrees S of W
D = 130 N @ 20 degrees S of E
From
the given vector quantities above,
a. illustrate the vectors
b. determine the summation of X
c. determine the summation of Y
d. determine the resultant vector
e. determine the angular position of the resultant vector
f. determine the directional position of the resultant vector
g. complete the magnitude and direction of the resultant vector
h. determine the equilibrant force
(a) how much force is needed? If it is lifted from the ground reaching a displacement of 2.5 meters, (b) how much Work is needed?
(c) if the dumbbell is repeatedly lifted for 10 seconds, how much Power is exerted?
