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A rock of mass 0.210 kg falls from rest from a height of 20.8 m into a pail containing 0.429 kg of water. The rock and water have the same initial temperature. The specific heat capacity of the rock is 1870 J/kg C °. Ignore the heat absorbed by the pail itself, and determine the rise in temperature of the rock and water in Celsius degrees.
A certain car battery with a 12.0 V emf has an initial charge of 115 A·h. Assuming that the potential across the terminals stays constant until the battery is completely discharged, for how various hours can it deliver energy at the rate of 110 W.
A laser beam of power 4.40 W and diameter 2.70 mm is directed upward at one circular face of a perfectly reflecting cylinder, which is made to "hover" by the beam's radiation pressure
A 230-N child is in a swing that is attached to ropes 1.90m long. Find out the gravitational potential energy associated with child relative to her lowest position at the following times.
What is the minimum speed the electron could have after the collision? The allowed energies of a simple atom are 0.0 eV, 5.5eV and 9.0eV
What is the velocity of the plank relative to the surface of ice.
A container is filled to a depth of 25.0 cm with water. What is the absolute pressure at the bottom of the container
A bullet of mass 0.0022 kg initially moving at 503 m/s embeds itself in a large fixed piece of wood and travels 0.71 m before coming to rest. Assume that the acceleration of the bullet is constant.
An electron moves in a circular path perpendicular to a magnetic field of magnitude 0.225 T, find the radius of the circular path
The sun is more massive than the moon, but the sun is farther from the earth. Which one exerts a greater gravitational force on a person standing on earth? Give the answer by determining the ratio Fsun/ Fmoon of magnitudes of gravitational forces.
As a summer intern for a microscope company, you are designing a compound microscope for a client that provides you with the following information. determine the barrel length needed for the microscope
what are the wavelengths of electro magnetic waves in free space that have frequencies of a) 5.00 x 10^19Hz, b) 4.00 x 19^9.
A roller coaster goes 26 m along a section of track sloping 10 degrees below the horizontal, followed by a 15-m section sloping upward at 6 degrees, followed by an 18-m section of level track. Find the net displacement.
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