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A raft is bobbing up and down in a lake. Its vertical position x above the flat surface of the water is given by x=0.60sin(3.0t+4.2).
The two points on Earth intersected by its axis of rotation are known as the __________ and _____________________ .
How does the terminal velocity scale with the size of the falling object? Assume that the density of that object is much larger.
On a clear sunny day, the sky above us looks bright blue. In the evening, the sunset puts on a brilliant show of reds, pinks and oranges. Why is the sky blue?
If a galaxy has a luminosity of 6.6x10^39 W and a brightness measured as 1.25x10^-11 W m^-2, How far away is the galaxy in mega parsecs?
Two metal spheres with the same diameter, one hollow and on solid, falls through air from the 10th floor of a building.
Which of the following lists of different types of electromagnetic radiation is correctly ordered in wavelength, from shortest to longest?
A rock is thrown off a vertical cliff with a horizontal velocity of 15 m/s. If the rock lands 25 m from the base of the cliff, how tall is the cliff?
How can physics help us in careers such us biotechnologist, astronomist, geology, biotechnology, aerospace, industry and communications?
How long does it take for this car to go from a speed of 55 mi/h to a speed of 55 mi/h to a speed of 60 mi/h?
We live at the bottom of a sea of air. The density of this air at the Earth's surface and 0°C is 1.29 kg/m3. Assume that the density of air does not change
One end of a wire is attached to a ceiling, and a solid brass ball is tied to the lower end. The tension in the wire is 120 N. What is the radius of the brass
A 150-lb fireman is holding a hose which has a nozzle diameter of 1 inch and hose diameter of 2 inches.
If we make each of the 3 dimensions 10 times as large, the mass increases by the same amount as our answer for the cube.
A tire contains 1ft3 of air at a gauge pressure of 28lb/in2. How much additional air at atmosphere pressure must be pumped into the tire to raise
Alyssa went to her outside faucet to fill a 0.032-m^3 bucket with water to wash her car. Water exits with a speed of 0.64 m/s.
What does the mathematical model say will happen to the car after it comes to a stop? What will actually happen? Why are the two different?
A copper wire 2.5 mm in diameter in carrying a current of 10 amperes. Assume one free electron per copper atom and find the magnitude of the drift velocity.
While exploring a sunken ocean liner, the principal researcher found the absolute pressure on the robot observation submarine at the level of the ship
Calculate the drift velocity of electrons in a copper wire given the current flowing in it, its diameter and density.
A hollow metal cube made of aluminum has an outer-length of 12cm and an inner length of 8cm each "side" of the outside of the cube is 12cm long
Assuming an average sea-level pressure of 1000hPa, what is the mass of the atmosphere? assume that the earth is as sphere with radius 6400km.
A dam to create a large fresh water lake is constructed. It will be approximately 14 meters deep. A horizontal pipe 1.2 meters long and 4 cm in diameter.
Four tanks of gas, labeled A, B, C, and D are stored under different conditions. The gases in these tanks are then placed into a fifth, tank E.
A ball is thrown directly downward, with an initial speed of 8.50 m/s, from a height of 31.0 m. After what time interval does the ball strike the ground?