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A 0.22-kg coffee mug is made from a material that has a specific heat capacity of 900 J/(kg · C°) and contains 0.23 kg of water. The cup and water are at 25° C. To make a cup of coffee, a small electric heater is immersed in the water and brings it to a boil in two minutes. Assume that the cup and water always have the same temperature and determine the minimum power rating of this heater.
A diverging lens (f = -12 cm) is located 20 cm to the left of a converging lens (f = 35.0 cm). A 3.00 cm tall object stands to the left of the diverging lens, exactly at its focal point.
What is the concentration of the Cd in the soil if the city of Des Moines adds 3 tons of compost/ acre-6 inches given the compost contains 50 ppm Cd
Three blocks, each having a mass of 1.16 kg, are connected by rigid rods of negligible mass and are supported by a frictionless surface, find the magnitude of the force applied by the rod on the left
Find the minimum volume of concrete (y = 23.6 kN/m3) needed to keep the gate (1 m wide) in a closed position; l = 2 m. Note the hinge at the bottom of the gate. Explain briefly.
An ion with charge q is distance r from a molecule with polarizability (alpha). Find an expression for the magnitude force F
How far will it coast before starting to roll back down. In addition, snow exerts a retarding force on the sled that points opposite to the direction of motion, and has a magnitude of 57 N. Find the acceleration of the sled and child.
Using the equation F=m v^2/r for a force an object in circular motion. Find the radius r of motion of a m=1.6 kg ball travelling in a circular path acted upon by a centripetal force F=7N.
A toy car with a mass of 120 g moves to the right with a speed of 0.62 m/s. A small child drops a 21.0-g piece of clay onto the car, What is the change in speed of the car
A "1m" mercury germicide lamp emits 50 Watt of 0.2537?m light through its quartz tube. compute the frequency of this light
A highway curve of radius 500 m is designed for traffic moving at a speed of 73 km/hr. What is the correct banking angle of the road.
Radiation of intensity 1.00 kW/m2 is incident on an area perpendicular to the incoming light. What is the resulting power per unit area now reaching the surface
The first person is initially moving forward with a speed of 2.5m/s and second person is initially at rest. What are the velocities of the two people after the snowball is swapped? Disregard friction between the skate and the ice.
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