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A woman is standing in the ocean, and she notices that after a wave crest passes, five more crests pass in a time of 50.0s.
A body consists of equal masses M of inflammable and non-inflammable material. The body descends freely under gravity from rest.
When looking at the night sky, you can see the light of different stars. If one star looks brighter than another, is it necessarily brighter? Explain.
A rocket is fired vertically upwards with initial speed V and is propelled by ejecting material downwards at a constant rate and with a constant speed.
Why do Sunspots always appear in pairs? Why do Sunspots always appear in pairs?
A raindrop is observed at time t=0 when it has mass m and downward velocity u. As it falls under gravity its mass increases by condensation.
Four stars of different mass arrive on the Main Sequence of the Hertzsprung-Russell Diagram at the same time. Which star has a mass just about the same
A 2-lb ball is thrown upward at 30ft/s from an origin 5-ft above the earth's surface. Using for your positive reference a vertical Y axis with its origin.
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?
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.