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Question1
As at rest, two trains has sirens that release a frequency of 300 Hz. The trains travel toward one another and toward an observer stationed between them. One of the train's moves at 30.5 m/s, and an observer hears a beat frequency of 2.4 beats per second. What is speed of the second train, which travels faster than 30.5 m/s?
Question2
The burner on an electric stove has a power output of 2.0 kW. An 810g stainless steel tea kettle is filled with 20 C water and placed on the already hot burner. If it takes 2.90 min for water to reach a boil, what volume of water, in cm^3, was in the kettle? Stainless steel is mostly iron, so you can suppose its specific heat is that of iron.
A 76 W light bulb with a resistance of 178 ? is connected to a power supply with a 117 V, What is the internal resistance of the power supply
Initially stationary (the train starts at rest), a train has a constant acceleration of 0.6 m/s2, What is its speed after 21 s
A spaceship heads away from earth at 0.20C. The ship beams 400nm light towards Earth. What is the wavelength of light received by the ship
An airplane has a mass of 20,000 kg and takes off under the control of a constant net force of 30,000 N. What is the net force that acts on the plane's 73 kg pilot.
If the contact time with the sidewalk is 1800s, what is the magnitude of an average force exerted on the superball by the sidewalk.
A 28.0kg child plays on a swing having support ropes that are 2.10m long. How fast will she be moving at the bottom of the swing
When the projectile is at the top of its trajectory, an internal explosion causes it to separate into two fragments of equal mass. One of the fragments falls straight downward as though it had been free from rest.
A plastic bag is filled with nitrogen at atmospheric pressure and 27.0 oC. If hot air is used instead of nitrogen, what is the required volume of the balloon if the air inside can be maintained at 39.0 oC
The rms speed of the molecules in 1.5g of hydrogen gas is 1800m/s . A:What is the total translational kinetic energy of the gas molecules, what is the rms speed of the molecules
The normal force equals the magnitude of the gravitational force as a roller coaster car crosses the top of a 49-m-diameter loop-the-loop
Two dogs pull horizontally on ropes attached to a post; the angle between the ropes in 69.0 degrees, Find the angle the resultant force makes with the rope of dog A
A suitcase is pulled by a tether that makes a 60 degree angle with the horizontal. what is the magnitude of the pull
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