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At a given instant in time, a 10-kg rock is observed to be falling with an acceleration of 5.5 m/s2. What is the magnitude of the force of air resistance acting upon the rock at this instant? Round the final answer to the nearest whole number.
The motion of a particle is given by x(t) = (25cm)cos(15t), where t is in s. At what time is the kinetic energy twice the potential energy
a mass m1 4.3 kg rests on a frictionless table and connected by a massless string to another mass m2 4.7 kg. a force
you have the following rc circuit v 52v c.1x10-6 f and r 3.1 mohmsthe circuit is initially uncharged. it is the
Use the parallel-axis theorem to calculate the rotational inertia of a meter stick, with centre of mass inertia Icm = ML2/12 and mass M = 4 kg, about an axis perpendicular to the stick and located at the 20 cm mark.
Holding a long rope by its upper end, you lower itonto a scale. Calculate the thrust exerted by the rope as it lands on the scale
Suppose you have a lens system that is to be used primarily for 770 nm light. What is the second thinnest coating of fluorite that would be nonreflective for this wavelength
Consider a charge of +1 nC (nanocoulombs, or Coulombs ×10?9) at (-3, -4) m, and a charge of -2 nC at (12, -5). Calculate the electric field strength at the origin
What capacitance must be used in this circuit if the time constant is to be 3.4 ms.
At what rate is the flywheel spinning while the power comes back on. How long after the beginning of the power failure would it have taken the flywheel to stop if the power had not come back on.
You throw a bouncy rubber ball and a wet lump of clay, both of mass m, at a wall. Both strike the wall at speed v, but while the ball bounces off with no loss of speed, the clay sticks. What is the change in momentum of the clay and ball
An ice cube is placed in a microwave oven. Suppose the ovendelivers 97 W of power to the ice cubeand that it takes 32170 J to melt it. How long does it take for the ice cube to melt
7.5 mol of helium are in a 18 L cylinder. The pressure gauge on the cylinder reads 67psi, What are the temperature of the gas in Celsius and the average kinetic energy of a helium atom
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