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An unknown substance has a mass of 0.125 kg and an initial temperature of 77.5°C. The substance is then dropped into a calorimeter made of aluminum containing 0.285 kg of water initially at 28.8°C. The mass of the aluminum container is 0.150 kg, and the temperature of the calorimeter increases to a final equilibrium temperature of 32.0°C. Assuming no thermal energy is transferred to the environment, calculate the specific heat of the unknown substance.
J/kg·°C
A force platform is a tool used to analyze the performance of athletes measuring the vertical force that the athlete exerts on the ground as a function of time. What impulse did the athlete receive from the platform
An indestructible bullet 1.85 cm long is fired straight through a board that is 11.10 cm thick. The bullet strikes board with a speed of 455m/s and emerges with a speed of 279m/s. (To simplify, suppose that the bullet accelerates only while the fr..
a 600kg car is going over a curve with radius of 120m that is banked at an angle 25 degree with a speed 30m/s. what is the normal force exerted by the road on the car
A 1.50 cm diameter parallel-plate capacitor with a spacing of 0.900 mm is charged to 300 V. What is the total energy stored in the electric field
Two converging lenses are separated by 24.20 cm. The focal length of each lens is 12.40 cm. Determine the final image distance relative to the lens on the right
An object of mass 250 g is attached to the first object, after which the system oscillates with half the original frequency. What is the mass of the first object
Consider a damped oscillator with m=0.2 kg, b= 4 N-m^-1 sec and k= 80N/m. Suppose that this oscillator is driven by a force F=Fo cos wt, What is the mean power input
To make an order-of-magnitude estimate of the energy level spacings in the nucleus, Calculate the energy of the ground state
trumpet creates a sound intensity level of 1.23 x 10^2 dB at a distance of 0.80 m. What is the sound intensity of a trumpet
A 47-g golf ball is driven from the tee with an initial speed of 52.0 m/s and rises to a height of 24.2 m.
A cylinder contains 1.85 mol of helium gas at 18.5°C. Assume that the helium behaves like an ideal gas. What is the average kinetic energy per molecule
Manufacturers of headache remedies routinely claim that their own brands are more potent pain relievers than the competing brands. Find the number of molecules of pain reliever
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