1. Homework Statement
A 5.9cm-thick layer of oil (n=1.46) is sandwiched between a 1.3cm -thick sheet of glass and a 2.4cm-thick sheet of polystyrene plastic (n=1.59)
How long (in ns) does it take light incident perpendicular to the glass to pass through this 9.6cm -thick sandwich?
2...
1. Homework Statement
How much heat will flow in 30 minutes through a 2m X 2m section of concrete (k= 8.36 x 10^-1 J/s m *C) 20 cm thick if the inside temperature if 21*C and the outside temperature is -10*C?
2. Homework Equations
Not sure but Q/t= {(kA/L} Tkelvin or Q/t=...
1. Homework Statement
A 1.6kg mass is suspended from a spring inside a stationary elevator. The spring stretches 12cm. The elevator now accelerates upwards, and the spring extends a further 12cm. What is the elevator's acceleration?
2. Homework Equations
Fy= may
Ue= 1/2 (kx2)
3...
1. Homework Statement
What is the total mechanical energy of a 290 kg satellite in a geosynchronous orbit around the Earth?
2. Homework Equations
W= K + UG where K= 1/2 (mv2) and UG= -(GmM)/r
Fc= mac where ac= v2/r
3. The Attempt at a Solution
I think the geosynchronous part...
1. Homework Statement
How much work must be done to allow the Earth to escape the Sun?
2. Homework Equations
E= K + UG where K= 1/2(mv2) and UG=-(GmM)/r
W= E2- E1
Fc=mac
3. The Attempt at a Solution
I have no idea where to start this, I missed the class where they took this up...
so,
Fc= mac
(GmM)/RE2=(mv2)/RE
v2=(GM)/RE
where RE is the radius of the earth
then,
E= K+ UG where K=1/2(mv2) and UG=-(GmM)/r2 and r= 2.55x107m (equal to 4 earth radii)
so,
E= 1/2(mv2) - (GmM)/r2
E= 1/2(GM)/RE) - (GM)/r2
E= 15633739.23 J
1. Homework Statement
A 1.3kg stone is whirled in a vertical circle at the end of a 0.83m long string. The tension in the string at the top of the circle is 6.4N. What is the tension in the string when the stone is at the bottom of the circle?
2. Homework Equations
Fc= mac...
1. Homework Statement
What is the total mechanical energy of a 380kg satellite in a circular orbit 3.0 Earth radii above the surface?
2. Homework Equations
W= E2- E1
E= 1/2 mv2- \frac{GmM}{r}
3. The Attempt at a Solution
I'm not sure if the equations above are suitable to...
1. Homework Statement
In a particular binary star system, Star A has a mass that is 28 times that of Star B. This distance between the stars is 34 AU (astronomical units). Find the location of the point in this star system where the net gravitational force on any mass would be zero.
2...
1. Homework Statement
Two blocks are stack on each other. The lower block has a mass of 6.8kg and μs=0.34 with the floor. The top block has a mass of 3.4kg and μs=0.65 between the two blocks. A force of 18N is being applied to the top box to the left. What maximum force can be applied to the...
1. Homework Statement
Find the normal force in terms of g, m, θ and α. There is no friction. a=0, θ≠α
See first attachment for diagram
2. Homework Equations
Fx=max
3. The Attempt at a Solution
I drew a free body diagram including the forces; normal, mg, and |FA| (See...
1. Homework Statement
A box is halfway up a ramp. The ramp makes an angle, θ with the ground. What is the maximum value of θ before the mass will slip? μ_{s}=0.25
2. Homework Equations
F_{x}=ma_{x}
3. The Attempt at a Solution
I drew a free body diagram to show the forces...
1. Homework Statement
A box is halfway up a ramp. The ramp makes an angle, θ with the ground. What is the maximum value of θ before the mass will slip? μ_{s}=0.25
2. Homework Equations
F_{x}=ma_{x}
3. The Attempt at a Solution
I drew a free body diagram to show the forces...
1. Homework Statement
A person is pushing against a wall, which just refuses to move. Fully and clearly describe how Newton's 3rd Law of Motion is affecting the person.
2. Homework Equations
Newton's 3rd Law of motion is defined as "If one object exerts an action force on a second...
1. Homework Statement
An amusement ride with a radius of 4.8m allows riders to experience 4.3g's of centripetal acceleration. What is the frequency of the ride?
2. Homework Equations
a_{c}= 4∏^{2}r∫^{2}
3. The Attempt at a Solution
a_{c}=4.3
r=4.8m
∫=?
I keep getting...
1. Homework Statement
The range of a projectile is 483m, and it reached a maximum height of 65m. What were the initial speed and launch angle of the projectile? Assume the start and finish heights are equal.
2. Homework Equations
3. The Attempt at a Solution
I just need a push...