What is the friction force that acts on him
A firefighter of mass 89 kg slides down a vertical pole with an acceleration of 3 m/s2. The acceleration of gravity is 10 m/s2 . What is the friction force that acts on him? Answer in units of N.
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a circuit contains six lamps with 60-W bulbs and a heater connected in parallel. the voltage across the circuit is 120 V. what is the current in the circuit when four lamps are turned on?
A string passes over a frictionless pulley and connects a 250 g block to 2.00 kg block. The inclines are frictionless. Assuming you release both masses from rest, how much time will it take the 250 g to travel 2200. cm along the ramp?
A 38.0 ohm resistor is made from a coil of copper wire whose total mass is 11.2 g. Find the length and diameter of the wire.
If the bullet has a mass of 28.0 and a speed of 410 , how high will the block rise after the bullet becomes embedded in it?
if the bucket is raised to the top of the well and released, what is the acceleration of the bucket as it falls toward the bottom of the well? (assume rope's mass is negligible, that cylinder turns on frictionless bearings and that g = 9.8m/s^2
Light of wavelength 520 nm is incident normally on a diffraction grating. Determine the total number of primary maxima that can be observed in this situation.
A simple harmonic oscillator consists of a block of mass 3.50 kg attached to a spring of spring constant 210 N/m. When t = 2.30 s, the position and velocity of the block are x = 0.140 m and v = 2.810 m/s.
A cop car drives at 30 m/s toward the scene of a crime, with its siren sounding (f = 2125 Hz.) Calculate the frequency heard by people at the crime scene as the siren approaches and the frequency heard as the siren moves away from the people.
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