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Q. What is the net upward force on an airplane wing of area 16.1 m2 if the speed of air flow is 294 m/s across the top of the wing and 278 m/s across the bottom?
Q. 1. The 30kg sack A is dropped on a spring scale from the height h=0. The platform B of the scale weighs 6 kg and the combined stiffness of the springs is 2000 N/m. Determine the maximum reading of the scale.
2. The 60kg cradle A is carrying the 12 kg pipe B at the speed of 8 m/s when it hits the rigid wall. Assuming all the impacts are plastic, determine the speed of the pipe immediately after the impacts. Neglect friction.
A turntable that spins at a constant 80 rpm takes 3.70s to reach this angular speed after it is turned on. Find its angular acceleration (in rad/s^{2}), suppose it to be constant, and the number of degrees it turns through while speeding up.
A wheel 45.0 cm in diameter accelerates uniformly from 206rpm to 340 rpm in 7.0 s. How far will a point on edge of the wheel have travelled in this time.
A tank of water sits at the edge of a table of height 2m. The tank springs a very small leak at its base, and water sprays out a distance of 1.4 m from the edge of the table. What is the water level h in the tank? (Assume the tank is open to the a..
If a parallel mirror He-Ne laser had a homogeneous line shape with v=1.5GHz, and small signal peak coefficient of .001/cm length=100cm and reflectance's 100 percent and 97 percent, how many longitudinal modes would initially contribute to the laser o..
For a certain change, the value of ëU is -2.37 kJ. During the change, system absorbs 650 joules. How much work did the system do.
Two cars with equal mass collide head on. One car is going 18 mph. That car is push backward about 38 feet. What is the speed of other vehicle.
Refrigerant-134a enters a compressor at 180 kPa as a saturated vapour with a flow rate of 0.35 m3/min and leaves at 700 kPa. The power supplied to the refrigerant during compression process is 2.35 kW. What is the temperature R-134a at the exit of th..
A string of 22 identical Christmas tree lights are connected in series to a 125 V source. The string dissipates 52 W. What is the comparable resistance of the light string.
The loaded cab of an elevator has a mass of 3.0 x 10^3 kg and moves 145 m up the shaft in 23 s at constant speed. At what average rate does the force from the cable do work on the cab.
An elevator releases 11200J of gravitational potential energy as descending 4m between floors. How much does elevator weigh.
The mean (average) of their squares
Consider the conical pendulum with an 80.0 kg bob on a 10.0 m wire making an angle of 5.00 with the vertical as shown. Determine (a) horizontal and vertical components of the force exerted by the wire on the pendulum and (b) radial acceleration of th..
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