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An insulated Thermos contains 180 cm3 of hot coffee at 79.0°C. You put in a 14.0 g ice cube at its melting point to cool the coffee. By how many degrees (in Celsius) has your coffee cooled once the ice has melted and equilibrium is reached? Treat the coffee as though it were pure water and neglect energy exchanges with the environment. The specific heat of water is 4186 J/kg·K. The latent heat of fusion is 333 kJ/kg. The density of water is 1.00 g/cm3.
The heels on a pair of women's shoes have radii of 0.42cm at the bottom. If 32 percent of the weight of a woman weighing 580N is supported by each heel, find the stress on each heel.
You are asked to design a parallel-plate capacitor having a capacitance of 1 F and a plate separation of 1.00 mm. compute the required surface area of each plate. Is this a realistic size for a capacitor.
A ball on a porch rolls 60cm to the porch's edge, drops 40cm, continues rolling on the grass, and eventually stops 80cm from the porch's edge. What is the magnitude of ball's total displacement, in centimeters.
A 165 pF capacitor is connected in series with an unknown capacitor, and as a series combination they are connected to a battery with emf of 21.3 V. If the 165 pF capacitor stores 112 pC of charge on its plates, what is the unknown capacitance.
The loaded cab of an elevator has a mass of 3000kg and moves 216-m up the shaft in 23s at constant speed. At what average rate does the force from the cable do work on cab.
What is the charge on negative electrode. Find out the wavelength.
An 18.0 g rifle bullet travelling 245 m/s buries itself in a 3.50 kg pendulum hanging on a 3.00 m long string, which makes the pendulum swing upward in an arc. Find out the vertical and horizontal components of the pendulum's displacement.
A 50 ice skater spins about a vertical axis through her body with her arms horizontally outstretched, making 2.50 turns each second. The distance from one hand to the other is 1.5 . Biometric measurements indicate that each hand typically creates ..
Travelling at a speed of 17.10 m/s, the driver of an automobile suddenly locks the wheels by slamming on the brakes. The coefficient of kinetic friction between the tires and the road is 0.740. What is the speed of the automobile after 1.81 s have el..
Two identical metal spheres and are connected by a plastic rod. Both are at first neutral. 6.0×10^12 electrons are added to sphere , then the connecting rod is removed.
A drunk driver in a 1600 kg car plows into a 1500 kg parked car with its brake set. Police measurements show that the two cars skid together a distance of 19 m before stopping. If the effective coefficient of friction is 0.78, how fast was the dru..
Find out the moment of inertia of the wheel if the block rises to a height of = 7.70 cm before momentarily coming to rest.
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