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A girl is sledding down a slope that is inclined at 30º with respect to the horizontal. The wind is aiding the motion by providing a steady force of 184 N that is parallel to the motion of the sled. The combined mass of the girl and the sled is 56.0 kg, and the coefficient of kinetic friction between the snow and the runners of the sled is 0.106. How much time is required for the sled to travel down a 107-m slope, starting from rest?
For the helium-neon laser, estimate the Doppler broadening of the output wavelength 632.8 nm at T = 243 K
If the weight of a room full of water is so great, why don't the first floors of houses built over basements all collapse as flooded to the ceiling.
A ruby laser emits an intense pulse of light that lasts a mere 30 ns. The light has a wavelength of 690 nm, and each pulse has an energy of 200 mJ. (A) How many photons are emitted in each pulse? (B) What is the rate of photon emission, in photons pe..
The primary coil of a transformer has N1 = 4.00 102 turns, and its secondary coil has N2 = 1.20 103 turns. If the input voltage across the primary coil is ?v = (140 V) sin ?t, what rms voltage is developed across the secondary coil? V
A 5.7x10^2 kg hot-air balloon takes off from rest at the surface of the earth. The wind and lift forces take the balloon up, doing +9.7 x 10^4 J of work on the balloon in the procedure. At what height above the surface of the earth does the balloo..
An unknown nucleus has twice the volume of a nucleus with 62 nucleons. What is the atomic mass number of the unknown nucleus
At a certain time a particle had a speed of 84 m/s in the positive x direction, What was the average acceleration of the particle during this 2.7 s intervl
A ray of red light in air , 650nm, is incident on semicircular block of plastic n=1.51, Determine angle of reflection at first interface
Consider a 4500. ohm resistor in series with a 133. mH inductor. What capacitance should be added in series so that the impedance is a minimum at 500. KHz
A 14 N horizontal force pushes a block weighing 3.0 N against a vertical wall, what is the force on the block from the wall
The energy for the 5s valence electron in rubidium (Z=37) has energy ?4.18 electron volts. What is the effective nuclear charge Zeff experienced
A platform is rotating with an angular speed of 3.00 rad/s and an angular acceleration of 11.0 rad/s2. what is the magnitude of the total acceleration
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