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A man pushes a 42 kg crate uphill along a plane inclined at 30 degree with respect to the horizontal. The man pushes the crate with a constant force of 250 N along the incline and the crate moves with constant velocity. If the crate travels a distance of 4.0 m along the incline, find:
1) the work done by the man.
2) the work done by gravity
3) the total work on the crate by dissipative forces such as air resistance.
The second harmonic sinusoidal standing wave in a pipe with both ends open has a wavelength of 2.00 m. The sound speed is 340 m/s How many nodes and anti-nodes are there in the displacement wave? How many nodes are there in the pressure wave? Draw..
A 125 kg flatbottomed boat is floating along at 5.0 m/s, headed east. Sally Sue, standing at one end of the boat, starts to walk at 2.0 m/s, what is the speed of the boat as she walks along
The position of a particle is given by 0.10cos(10pi t) m, where t is in s. What are the frequency and the period
An object with a mass of 0.427kg is attached to a long horizontal spring with a constant of 42.6kg/s2. How long does it take the the particle to move from -0.500m to 0.500m
Two different elements with half lives Ta and Tb have Na & Nb (undecayed) atoms respectively, Determine the ratio of their activities at this instant
when free from rest from this spot, the particle arrives at B with twice the speed it previously had, or 2vB. Find the potential at B.
A series circuit with R=20ohms, C=330 MuF and L=30 mh, is connected to an AC sourceof amplitude 160v and frequencey of 60 Hz, Whats the power dissipated by the circuit
A superconductor in a magnetic field obeys the relationship B(T) = B(0) [1 – (T/Tc)2]. If the superconductor has a Tc of 20K and it is operated at T = 4.2K the critical field is 30T. Determine the maximum operating temperature if the material is used..
A uniform-density 8 kg disk of radius 0.27 m is mounted on a nearly frictionless axle. Initially it is not spinning. A string is wrapped tightly around the disk, and you pull on the string with a constant force of 39 N by a distance of 0.7 m. Now ..
In a head on collision, a car stops in .10 seconds from a speed of 14 meters per second. The driver has a mass of 70 kg, and is, fortunately, tightly strapped into his seat. What force is applied to driver by his seat belt during that fraction of ..
A 6 m long 50 kg ladder leaning on a frictionless wall can successfully be scaled by a 120 kg man. find the minimum angle between the ladder and the floor
A spaceship moves past you at speed v. You measure the ship to be 287 m long, whereas an astronaut on the ship measures a length of 380 m. Find out v.
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