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A 40 kg box is sliding down a ramp angled at 15 down from the horizontal. The box is accelerating at 1.5 m/s^2 down the ramp. Ignoring air resistance, what is the force of friction between the box and the ramp?
How many turns of wire would be required to make a 120-mH inductor out of a 28.0-cm long air-filled solenoid with a diameter of 5.9cm
A particle with a mass of 1.00 10-5 kg and a charge of +2.3 µC is released in a (parallel-plate) uniform horizontal electric field of 16 N/C. A. How far horizontally does the particle travel in 0.46 s
an average human dna molecule contains 5 x 108 base-pairs each of which could be regarded as a rung on the dna ladder
Calculate the transmittance T and the reflectance R, that is, the relative amounts of power transmitted through and reflected from the boundary. Verify that your answers are consistent with the law os conservation of energy.
A loudspeaker of mass 22 is suspended a distance of = 1.6 below the ceiling by two cables that make equal angles with the ceiling. Each cable has the length of = 3.10.
A 54.0 kg ice skater is gliding along the ice, heading due north at 4.10 m/s. What is the minimum value of Ug that allows her to continue moving straight north
A ball is launched with an initial velocity of 24.9 m/s at a 45° angle from the top of a cliff that is 9.00 m above the water below. What is the balls speed when it hits the water
A cord of length 1.2 m is fixed at both ends. Its mass per unit length is 1.1 g/m and the tension is 11 N. What is the frequency of the fundamental oscillation
Using energy considerations, compute the average force the beam exerts on the pile driver while the pile driver is brought to rest.
A spool whose inner core has a radius of 1.00 cm and whose end caps have a radius of 1.50 cm has a string tightly wound around the inner core. what is the speed of the spool
A high-energy pulsed laser emits a 1.0-ns-long pulse of average power 3.4 *10^11 W. The beam is 2.1*10^-3 m in radius. Determine the energy delivered in each pulse
A long sighted person can only see clearly objects further than 1.2 m away.They wish to read a book held 30 cm away. Calculate the power (in diopters) of the lens in thier corrective spectacles:
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