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An 19.0-kg box is released on a 38.0^ incline and accelerates down the incline at 0.280m/s^2 Find the friction force impeding its motion. How large is the coefficient of kinetic friction?
At what temp is the typical thermal energy, kT, equal to this band gap?
What is the magnitude of the acceleration as the elevator brakes to a stop?
A 20000 { kg} rocket has a rocket motor that generates 3.0×105{ N} of thrust. What is the rocket's initial upward acceleration? At an altitude of 5.0 { km} the rocket's acceleration has increa
The wire of the solenoid is jacketed with an insulator so that none of the current flows into the core.) Part A) For a point inside the core, find the magnitude of the magnetic field B due to the sole
A conducting spherical shell with inner radius a and outer radius b has a positive point charge Q located at its center. The total charge on the shell is -3Q, and it is insulated from its surroundi
A closely wound, circular coil with a diameter of 4.30{\rm cm} has 630 turns and carries a current of 0.600{\rm A} What is the magnitude of the magnetic field at a point on the axis of the coil a di
The capacitor is then disconnected from the battery, and the spacing between the capacitor plates is doubled. As a result of this change, what is the new voltage between the plates of the capacitor?
If the charge in part (a) is due to K+ ions (charge +e), how many such ions are present on the outer surface?
The inner and outer surfaces of a cell membrane carry a negative and positive charge, respectively. Because of these charges, a potential difference of about 0.077 V exists across the membrane.
Find the current that flows during a pulse. Find the energy delivered in one pulse Find the average power supplied by the pacemaker.
A film with n= 1.65 is deposited on glass with n= 1.5. what is the thinnest film that will produce constructive interference in the reflection of light with a wavelength of 530 nm? a) 321 nm b) 353
At one time, television sets used "rabbit-ears" antennas. Such an antenna consists of a pair of metal rods. The length of each rod can be adjusted to be one-quarter of a wavelength of an electromagn
Assuming a constant angular acceleration, how long would it take the bit to reach its maximum speed of 7.03 x 104 rad/s, starting from rest?
The tires of a car make 71 revolutions as the car reduces its speed uniformly from 95 km/h to 44 km/h . The tires have a diameter of 0.77m. What was the angular acceleration of the tires?
The blades in a blender rotate at a rate of 6600 rpm. When the motor is turned off during operation, the blades slow to rest in 2.9 s what is the angular acceleration as the blades slow down in rad/
A thin insulating rod is bent into a semicircle arc of radius a, and a total electric charge Q is distributed uniformly along the rod. Calculate the potential at the center of curvature of the arc i
A infinite long cylinders symmetric current distribution with radius R and a total current I > 0. the distributions current density J is time independant, parallel with the cylinder axis and has
A glass lens (nglass = 1.52) has a 134 nm thick anti-reflective film (nfilm = 1.39) on one side. Light, moving through the air, is normally incident on the lens passing through the film. What is the
Light of wavelength 558.0 nm is incident on a narrow slit. The diffraction pattern is viewed on a screen 78.5 cm from the slit. The distance on the screen between the third order minimum and the cen
A student holds a tuning fork oscillating at 258 Hz. He walks towards a wall at a constant speed of 1.42 m/s. (a) What beat frequency does he observe between the tuning fork and its echo?
The lowest frequency that produces resonance is 4100 Hz. The speed of sound in an aluminum rod is 5100 m/s. Find the length of the rod.
Resonance is heard when the piston is at a distance d1 = 23.0 cm from the open end and again when it is at a distance d2 = 68.3 cm from the open end. (a) What speed of sound is implied by this data?
a-Write the displacement vector from plane to ship, letting represent east, north, and up. km b-How far apart are the plane and ship?
It takes the cannonball 1.15 seconds to fall to the ground, and air resistence is negligible. How much work is done by gravity on the falling cannonball? ______J During the fall, what is the average