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Residence Time of Water
A stable and highly soluble pollutant is dumped into a lake at the rate of 0.19 tonnes per day. The lake volume is 2E7 m3 and the average water flow-through rate is 8E4 m3 per day. Ignore evaporation from the lake surface and assume the pollutant is uniformly mixed in the lake. What eventual steady-state concentration will the pollutant reach (in ppm)?Hint: Calculate residence time of water in lake. Multiply by pollutant input rate.
A toy car moves at a velocity of 65.00 m/s on a compass heading of 115degrees. What are the components, magnitude and direction of car.
A small rocket is powered upward on lift-off by an engine thrust of 12,000-N. If the resulting upward acceleration is 6.40m/s^2, what is the mass of the rocket?
If a metric ton is 1 x10^3 kg, how many 88 kg people can safely occupy an elevator that can hold a maximum mass of exactly 1 metric ton.
What total impulse was imparted by these forces. Near Earth, the density of protons in the solar wind (a stream of particles from the Sun) is 12.0 cm-3, and their speed is 702 km/s. Find the current density of these protons.
A hydraulic chamber with a spring (spring constant = 1600 N/m) attached to the input piston and a rock of mass 40kg resting on the output plunger.
Two spheres are launched horizontally from a 1.10 {rm m} high table. Sphere A is launched with an initial speed of 5{rm m/s}. Sphere B is launched with an initial speed of 3.0 {rm m/s}.
A thin, uniformly charged spherical shell has a potential of 720 V on its surface. Outside sphere, at a radial distance of 29.0 cm from this surface, the potential is 434 V.
Bruce stands on a bank beside a pond, grasps the end of a 10.00-m long rope attached to a nearby tree and swings out to drop into the water. If the rope starts at an angle of 36° with the vertical, what is Bruce's speed at the bottom of swing.
compute the diameter of the bright circular spot formed.
From what height did the student fall? Assume that the only force acting on him throughout the collision is that as a result of the ground.
A man is running at speed c (much less than the speed of light) to catch a bus already at a stop. At t=0, while he is a distance b from the door to the bus, the bus starts moving with the positive acceleration a.
Batteries are rated in terms of ampere-hours (A · h). For example, a battery that can produce a current of 3.00 A for 5.00 h is rated at 15.00 A · h.
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