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A railroad car of mass 25,000 kg is moving with a speed of 5.50 m/s. It collides and couples with three other coupled railroad cars, each of the same mass as the single car and initially at rest. What is the speed of the four cars immediately after the collision?
An ac series circuit has an impedance of 196 ? , and the phase angle between the current and the voltage of the generator is ? = -72°. The circuit contains a resistor and either a capacitor or an inductor
Two narrow slits are used to produce a double slit diffraction pattern with monochromatic light (lambda=450 nm) onto a screen that is 9.5 m away. If the distance between two adjacent dark fringes near the center of the pattern is 1.5 cm, what is the ..
In a new (inelastic) collision, the same two bumper cars with the same initial velocities now latch together as they collide. What is the final speed of the two bumper cars after the collision
A sinusoidal electromagnetic wave having a magnetic field of amplitude 1.50uT and a wavelength of 430nm is traveling in the +x direction through empty space. What is the amplitude of the associated electric field
A spy satellite is in circular orbit around Earth. It makes one revolution in 5.99 hours, How high above Earth's surface is the satellite
With its double helix structure, DNA is coiled like a spring. A biophysicist grabs the end of a DNA strand with optical tweezers, What's the DNA spring constant
A ball on a porch rolls 44 cm to the porch's edge, drops 94 cm, continues rolling on the grass, What is the magnitude of the ball's net displacement
The drawing shows two situations in which charges are placed onthe x and y axes. They areall located at the same distance of 6.6 cm from the origin O. Foreach of the situations in the drawing, determine the magnitude ofthe net electric field at the o..
In an R-L-C series circuit the magnitude of the phase angle is 52.9? with the source voltage lagging the current. The reactance of the capacitor is 360? , Find the reactance of the inductor
After a 0.805 nm x-ray photon scatters from a free electron, the electron recoils with a speed equal to 1.32E+6 m/s. find the Compton shift in the photon's wavelength
A husband buys a helium-filled anniversary balloon for his wife. The balloon has a volume of 4.1L in the warm store at 72deg F. By how much has the volume decreased
Two 10-cm-diameter charged disks face each other, 20 cm apart. The left disk is charged to +55 nC and the right disk is charged to -55 nC. What is the electric field both magnitude and direction, at the midpoint between the two disks
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