Homework Statement
T-butyl chloride can undergo substitution reaction to create C4H9OH, but isopropyl chloride cannot. Why is this?
Homework Equations
The Attempt at a Solution
I'm guessing it has to do with the extra carbon. Maybe since it is a secondary halide, the substitution...
Homework Statement
Radioactive iodine (131-I) has a half life of 8 days. How long does it take for iodine to be reduced by factor of 100?
Homework Equations
N(t)=N(o)e-kt
k=ln100/t1/2
The Attempt at a Solution
N(t)=N(o)e-kt
N(t)/N(o)=e-ln(100/8)t
Now I'm stuck. I would...
Homework Statement
What is the value of the principal quantum number for a hydrogen atom to have a size of one micron?
Homework Equations
r=(5.3x10-11)(n2)
r=1x10-6/2=5x10-7
The Attempt at a Solution
5x10-7=(5.3x10-11)(n2)
97.1 = n
How is this possible? lol Maybe it's more complicated...
Homework Statement
Two uniform plates have a uniform charge density of 10 Coulombs/m2. The plates have dimensions of 0.6x0.6 m2 and are seperated by 2mm
a) The electric field (V/m) between the two plates is given by E=1.13x1011 Q/A where Q is the charge in Coulombs on one plate and A is the...
Homework Statement
Two equally charged 1g masses repel each other. The lower mass is held fixed.
a)What is the charge on each mass for the Coulomb force to balance the gravitational force of the Earth on the upper mass?
b)How many elecetrons does this rep?
Homework Equations...
Homework Statement
Consider pipe of lenght L. The pipe is closed at one end and open at the other allowing a standing wave where a node exists at the closed end and a max exists at the open end.
a) what are the resonant wavelengths?
b) If L=5, what is the lowest frequency?
Homework...
Homework Statement
An orchestra wants to have a listener in front of a conductor hear notes at the same time, played by the violinist located next to the conductor and from a drummer located 33m further back.
a) How long should the violinist wait before playing her note? (assuming drummer...
Homework Statement
A .5kg hockey puck moving at 2 m/sec strikes another puck with a mass of 1kg. The puck then travels at an angle of 60 degrees with a speed of .75m/sec with respect to the motion of the original puck.
a) What is the final speed of the first puck?
b) What is the final...
Homework Statement
A 55kg mass is projected vertically with and initial speed of 30m/sec
a) what is original kinetic energy
b) What is kinetic E after 4.5 seconds
c) What is chg in gravitational potential E in these 4.5seconds?
Homework Equations
W=mv2/2
W=(m/2)(gt)2
W=mgh...
Homework Statement
Estimate E generated by water falling over Niagara falls in 5 day.
Height = 150m
Water flow =104m3/sec
t=5x24x60x60=4320000sec
Homework Equations
P=W/t
mgh=mv2/2
The Attempt at a Solution
Work=mgh=m(9.8)(150)
Time=432000seconds
P=m(1470)/4320000
I just...
Homework Statement
How far above the earth must an object be in order to lose 30% of its weight?
Homework Equations
ma=Gm(Mearth)/r^2
a=v^2/r
v=2pir/T
The Attempt at a Solution
I think the 30% lost weight would be the same as the earth's weight losing 30%. Therefore, I can put...
Homework Statement
Two identical spaceships are sent to explore a planet with two moons. Each spaceship orbits one of the moons.
a)The orbital radii are observed such that the spaceship have the same period. What is the relative mass of the two moons if the two radii differ by a factor of...
Homework Statement
An individual standing at the equator:
a)What is this individuals centripetal acceleration caused by the earths rotation?
b)How fast would the earth need to spin in order for the centripetal acceleration to be equal to g?
T=1 day
radius of earth = 6.4x10^6 m...
Homework Statement
A block, moving along a horizontal plank, is acted upon by a force of friction that is equal to 35% of the weight of the block. The block comes to rest from a speed of x m/s. Find x.
Homework Equations
v=u + at
F=F1 + F2
The Attempt at a Solution
I can't even attempt...
Homework Statement
A truck with a mass of 20000kg goes around a circular path with a speed of 50km/hr. If the radius is 105m. Calculate the centripetal force acting on the car.
Homework Equations
This is why I can't get the answer to this question. I don't know which equation to use. I'm...
Homework Statement
A 10kg mass has a force pointing in the east direction and another force pointing in the south direction 45 degrees from the east force |F1|=12 Nt, |F2|=19 Nt
a)total force vector?
b)mag of total force
c)direction of total force
Homework Equations
F=F1 + F2...
Homework Statement
A ball is thrown from the ground (height=0) with an initial speed Vo at an angle of 45 degrees
a)when does ball start falling to earth
b)what is balls max height
c)How long does it take to hit the ground again?
d)where does the ball hit the ground?
Homework...
Homework Statement
A boat heading south initially with a speed of 10 m/s has a constant acceleration of a= (10,5,10) m/s^2
What is the velocity, speed, position and distance travelled after 30 minutes?
u=10m/s
a=(10,5,10)
t=30 min = 1800
Homework Equations
v = u + at
The Attempt at a...