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The 100-lb platform A is attached to springs B and D, each of which has a constant k = 120 lb/ft. Knowing that the frequency of vibration of the platform is to remain unchanged when an 80-lb block is placed on it and a third spring C is added between springs B and D, determine the required constant of spring C.
A wheel accelerates from rest to 12 rad/s at a rate of 78 rad/s^2. Through what angle (in radians) did the wheel turn while accelerating
The mass of Mercury is 0.0550 times that of earth, and its radius is 0.380 times that of earth, Calculate the average density of Mercury (in kg/m3) given the earth's density is 5.52×103 kg/m3
A centrifuge in a medical laboratory rotates at an angular speed of 3500 rev/min. When switched off, obtain the constant angular acceleration of the centrifuge
A flywheel in the form of a uniformly thick disk of radius 1.78 m, has a mass of 59.1 kg and spins counterclockwise at 429 rpm. Calculate the constant torque required to stop it in 3.25 min
A 5.00 mL syringe has an inner diameter of 6.00 mm, a needle inner diameter of 0.210 mm, and a plunger pad diameter (where you place your finger) of 1.2 cm. A nurse uses the syringe to inject medicine into a patient whose blood pressure is 140/100..
A boy stands on a bridge 13.7 m above the water, and he drops a water balloon on a boat of unsuspecting tourists. How far away from the base of the bridge was the boat when the boy released the balloon
The theory of relativity had a great significance in physics, what scientist is famous for this type of theory?
A student (m= 75 kg) falls freely from rest and strikes the ground. throughout the collision with ground, he comes to rest in a time of 0.040 s. the average force exerted on him by the ground is +18 000 N.
In a uniform circular motion the a) acceleration is parallel to the velocity b)acceleration is vertical while the velocity can be in any direction c) acceleration is always vertical and the velocity is horizontal d) acceleration is perpendicular to t..
1 explain what is meant by the terms isothermal expansion and adiabatic expansion. in each case derive an expression
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..
An extreme skier, starting from rest, coasts down a mountain that makes an angle of 34.3 ° with the horizontal. How fast is she going just before she lands
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