Homework Statement
A 0.8m high and 1.5m wide double pane window consisting of two 3mm thick layers of glass(k=0.78W/mK) is separated by a 10mm wide stagnant air space(k=0.026 W/mK). The convection heat transfer coefficients on the inner and outer surfaces of the window are 10W/m^2K and 35W/m^2K...
Homework Statement
Two radioactive isotopes of singly charged plutonium(Pu-249 and Pu-244) are accelerated through a potential difference of 3.00kW and enter a uniform magnetic field of 1.50T directed perpendicular to their velocities. By performing relevat calculations, show that the ratio of...
Homework Statement
Two long wires carrying current I1 and I2 in opposite directions pass through a closed path S as shown in the picture.
What are the values of ∫B⋅ds and ∫E⋅ds if:
i) I1=I2=1A
ii) I1=1A and I2=0A?
Homework Equations
Ampere's Law: ∫B⋅ds=μ0I
Faraday's Law: ∫E⋅ds=-dΦB/dt
The...
Homework Statement
A small ball of mass 0.50 kg is attached to a cord and perform uniform-speed circular motion of radius 2.0 m in a vertical plane.
i) If the speed of the circular motion is 10m/s, determine the tension in the cord at the lowest point of the circular motion.
ii)...
Homework Statement
The position s (in metres) of a particle, as a function of time t (in seconds), is described by the equation s=5i+4r^2j. i and j are perpendicular unit vectors.
a) Calculate the position of the particle at t=5.
b) Determine the particle's average velocity between t=0 and...
Homework Statement
One speaker is located at the origin and the other is located at (x,y)=(0,3.00m). The speakers emit identical sound waves of wavelength 2.00m which are initially in phase. Where does constructive interference occur?
ANS: x=1.50m
The Attempt at a Solution...
Homework Statement
Three positive charges lie on the x-axis; q1 = 15 μC is at the origin, q2 = -30 μC is at x = 2 m, and q3 = 15 μC is a x = 3 m. ( please also refer to the attachment.)
Find the electric potential and electric field at point “P” aroused from q1, q2 and q3.
The Attempt at...
Homework Statement
A wave on a string has a wave function with the form of:
y(x,t)=0.02sin(6.35x+2.63t)
Find the shortest time for the displacement of the string at any point on the chain changes from 0.01m to -0.02m.
The Attempt at a Solution
The answer said we can set x=0.
And...
Homework Statement
http://postimg.org/image/8oweasluj/
Each rectangle in the figures represents a resistor with resistance=2.9kΩ.
a) What is the net resistance of the circuit of Fig 1 connected to the battery? Each resistance has R=2.9 kΩ.
b) What is the current flowing into the...
Homework Statement
Steam at 2 MPa and 208°C enters a nozzle with 20m/s. During the expansion process, its enthalpy drops to 2.86 MJ/kg because of the losses encountered.
a) Determine the exit velocity from the nozzle.
b) If the mass flow rate is 1kg/s, determine the flow area at the...