# Recent content by hsphysics2

1. ### Speed of Light waves

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...
2. ### How much heat will flow Thermodynamics

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=...
3. ### (Gravitational) Binding Energy

W=E2- E1 W=0- 1/2(MEv12)- (GMEMS)/r1 I don't know v1 so how can I solve for work?
4. ### Elastic Potential- Acceleration with springs

oops, so k=130.666 N/m
5. ### Elastic Potential- Acceleration with springs

Fy=may kx-mg=0 k=(mg)/x k=1306.666 N/m Fy=may kx-mg=may ay=(kx-mg)/m ay=9.79999 m/s2
6. ### Elastic Potential- Acceleration with springs

Fy=may kx-mg=may ay=(kx-mg)/m but k is not given....
7. ### Elastic Potential- Acceleration with springs

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...
8. ### Mechanical Energy- Geosynchronous Orbit

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...
9. ### (Gravitational) Binding Energy

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...
10. ### Mechanical Energy- Orbit

would it be, E= K + UG E= 1/2 (mv2) - (GmM)/r E= 1/2 m(GM/r) - (GmM)/r E= 2.377074x1010 J
11. ### Mechanical Energy- Orbit

so it would just be E= 1/2(GM/r) - (GM)/r E= -7819322.353 J
12. ### Mechanical Energy- Orbit

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
13. ### Work Energy- Tension

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...
14. ### Mechanical Energy- Orbit

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...
15. ### Dynamics- Net Gravitational Force

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...