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1. You take a 50 g glass coffee mug from the dishwasher following the dry cycle. You use a dishcloth because the temperature of the mug is 90 deg C. You fill the mug with 250 g of cold water from the refrigerator. The temperature of the water is 5 deg C. Assuming that no heat is lost to either the air, the kitchen counter, or to your hand (all stupid assumptions, but what the heck), what will be the final temperature of the cup, and of the water in it? [Specific heats: glass, 837 J / (kg)(C); water, 4186 J / (kg)(C) ]
2. A spacecraft power system generates electricity by absorbing heat from a nuclear reactor operating at 1000 deg C and expelling heat from a radiator operating at 300 deg C. What is the theoretical maximum efficiency of the system? (Don't forget, temperatures must be in K, not C!)
A 2.10 mass is pushed against a horizontal spring of force constant 26.0 on a frictionless air table. What is the greatest acceleration of the mass
In a deep dive, a whale is appreciably compressed by the pressure of the surrounding water. Explain what happens to the whale density
A person of mass 73kg stands at the center of a rotating merry-go-round platform of radius 3.5m and moment of inertia 950kg kg m^2. Calculate the rotational kinetic energy of the system of platform plus person after the person's walk
a 72 nc charge is located at x3.00 meters on the x axis and an 8.0nc charge is located at x7.0 meters. at what point on
The lifetime of a pi meson in its on frame of reference is2.6* 10^-8 sec. If the meson moves by a speed of .99c, a) what is the lifetime as gauged by an observer at rest on Earth? b) How high would a 100m mountain be gauged in the meson's frame of re..
A rocket is fired straight up and accelerates upward at 12 m/s2 for 18 seconds. The rocket then runs out of fuel and coasts still going up. Ignore any air resistance effects on the rocket and use -9.8 m/s2 for the local acceleration due to gravity..
A block of mass 2.0 kg is at rest on an incline with variable angle (theta). The distance from the block to the bottom end of the incline is 300m. if the incline is set to 40 degrees, how long will it take the block to reach the bottom if it starts..
The armature of a shunt motor has a mass of 250 kg and a diameter of 30 cm. assume the mass of the amature is evenly distributed in the armature. find the rotational inertia of the armature.
You are playing college basketball and some time after crossing the midcourt line you shoot the ball at an angle of 53 degrees above the horizontal. how many points did you score
a long solenoid cross-sectional area 1.4 x 10-6 m2 number of turns per unit length 2102 turnsm is bent into a
1. what is the difference between the electric field electric potential and the force exerted by the electric field?2.
the headlights of on a small car are separated by 115 cm. at what maximum distance could you resolve them if the
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