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Q1. A ball tied to the end of the string is swung in a vertical arc of radius r under the action of gravity. What would be the tension in the string at the highest point and when the ball is at the lowest point?
Q2. A 73 kg parachutist descends during a vertical height of 420 m with constant speed. Find the increase in entropy produced by the parachutist; assume the air temperature is 21°C.
A 46kg box is being pushed a distance of 7 m across the floor by the force vector P whose magnitude is 144N. The force vector P is parallel to the displacement of the box.
A resistance R and a 3-H inductance are in series across a 60-Hz ac voltage. What is the ac input voltage
question1suppose that for some process the cross section for absorption of a certain wavelength photon is 10-16 cm2 and
A beam of polarized light with an average intensity of 18.9 W/m2 is sent through a polarizer. find the rms value of the electric field of the transmitted beam
The force diagram shown describes the forces acting on the back while bending at the waist in static equilibrium the trunk makes a 60 degree angle with the vertical. hat is the torque equation about point A
A massless spring with spring constant 22.10 N/m hangs vertically. A body of mass 0.280 kg is attached to its free end and then released. Assume that the spring was unstretched before body was released. How far below the initial position does the ..
question1a hotel elevator ascends 160 with a utmost speed of 4.9. its acceleration and deceleration both have a
A 5.00--long ladder has mass 12.5 kg and is leaning against a frictionless wall, making a 64 degree angle with the horizontal. If the coefficient of friction between the ladder and ground is 0.42, what is the mass of the heaviest person who can safel..
Is the collision completely elastic
The yellow light from a helium discharge tube has a wavelength of 587.5 nm. Calculate the number of lines per centimeter on the grating
Both surfaces of a double convex lens have radii of 30.0 cm. what is the index of refraction of the lens material
A spherical balloon has a radius of 12.5 m, and is filled with helium. How large a cargo can it lift, assuming that the skin and structure of the balloon have a mass of 1200 kg? avoid the bouyant force on the cargo volume itself.
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