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Question1
A block of mass m1 = 4 kg moves from rest under the influence of a varying force F(x) = 4x + 38, where F is in Newtons and x is in meters, on a rough horizontal surface having a coefficient of kinetic friction of 0.2. The block is connected by a light cord passing over a small frictionless pulley to a second hanging block of mass m2 = 3 kg. If a system moves from x= 0 to x= 2m, calculate:1) work done by the force F(x) to move m1 from x= 0 to x= 2m.
2) Change in the potential energy of each mass
3) work done by friction.
4) The change in the kinetic energy of the system.
Question2
A non-uniform, 2.0 m long ladder weighing 400 N leans against a smooth vertical wall (no friction). The ladder makes an angle of 30 degrees with vertical. The coefficient of static friction at ground is 0.3. A child with weight of 300 N can climb the ladder of 1.2 m before it starts to slide down. The location of the centre of gravity of the ladder relative to ground is? The normal force coming from a smooth wall is?
A student sees a newspaper ad for an apartment that has 1830 square feet (ft2) of floor space. How many square meters of area are there
A certain guitar string has a length of 0.7 meters and a linear mass density of 1.2 grams/meter. A tension of 24 Nt. is applied to it. What will be the speed of the wave on the string
estimate the average power output on the way up. A speedboat moving at 39 m/s approaches a no-wake buoy marker 100 m ahead. The pilot slows the boat with a constant acceleration of -3.15m/s2 by reducing the throttle.
If an electric wire is allowed to produce a magnetic field no larger than that of the Earth .45E-4 T at a distance of 27 cm
The density of water is 1000kg/m^3 or 8.33lbm/gallon, the mass flow rate is 494838.83 kg/s and goes through a turbine generator that has 0.80 efficiency
A long string of tension T and mass density ÃŽ · is attached to a small sphere of mass m. What is the displacement of the string on the right side of the mass, yt(x,t)
A car speeds past a stationary police officer while travelling 115km/h. The officer immediately begins pursuit at a constant acceleration of 10.20 km/h/s (note the mixed units), just as the driver passes the officer.
Consider an RC series circuit. You measure R to be 887-ohm and C to be 831 nF. You set the signal generator output to produce a sinusouidal output with an amplitude of 2.05 V.
A boy pulls with a force of 20 N on the 300 N wagon. What acceleration does the wagon have
What is the average induced emf in the coil in mV. If he is crossing a river where the current is 1.60 km/h, in what direction should his boat be headed if he wants to reach the point directly opposite his starting point.
A charge of 20 nC is uniformly distributed along a straight rod of length 4.0 m that is bent into a circular arc with a radius of 2.0 m
An electric blanket is connected to a 120-V outlet, What is the resistance of the heater wire in the blanket
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