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A small spherical small ball of radius 'a' of a material of density 'p' falls from rest in still air of viscosity 'n' . now(1) write up the equation of motion of the ball (2) estimate its terminal velocity and (3) find out the time and distance traversed when the ball has acquired 90% of the terminal velocity.
A volume of 1,5 m3 is occupied by two fluids. Fluid 1 has a specific gravity of SG=2, while Fluid 2 has a density of 800 kg.m-3? The mass of Fluid 1 is three times the mass of Fluid 2. calculate each fluids mass
A 90 kg physics teacher stands on a rotating platform with a 15 kg mass in each hand. With his arms outstretched (each arm is 75 cm long) he spins at a rate of 4 rev s -1 . He brings his arms in and his speed increases to 9 rev s -1 . Compute the ratio of his rotational inertia when arms are out to his rotational inertia when arms are in.
A wheel accelerates with a constant angular acceleration of 6.5 rad s-2
. If the initial angular velocity is 2 rad s-1
.
What is the angular velocity at t = 2 s.
Use Fermi calculations.
A point charge is placed at each corner of a square with side length a. All charges have magnitude q. Two of the charges are positive and two are negative. What is the direction of the net electric field at the center of the square due to the four charges, and calculate its magnitude in terms of q and a?
A 5450 m3 blimp circles Busch Stadium during the World Series, suspended in the earth’s 1.21
kg/m3 atmosphere. The density of the helium in the blimp is 0.178 kg/m3. a) What is the
buoyant force that suspends the blimp in the air? b) How does this buoyant force compare to
the blimp’s weight? c) How much weight, in addition to the helium, can the blimp carry and
still continue to maintain a constant altitude?
- FIND THE DRIFT VELOCITY OF THE FREE ELECTRONS INSIDE THE COPPER METAL WITH AREA 10(-5) METER SQAURE AND CURRENT ACROSS IS 100 A(GIVEN THE DENSITY 8969 KG/ METER CUBE.(can someone explain the equation you use)
Find the magnitude of vector 𝑪⃗ = 𝑨⃗ − 𝑩⃗⃗ . Use all the information presented by the graph.
