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A 2 m long see-saw is balanced in the middle. A 10 kilogram boy sits at one end a girl sits on it 0.3 meters away from the other end. Evaluate what is her mass?
A 10 kg block sits motionless on a table in spite of an applied horizontal force of 2 N. What are the magnitudes of the reaction force
A 10 gram bullet is fired into a ballistic pendulum made froma 4 kg wood block and two light cords. The block’s vertical displacement is 5 cm. What is the initial velocity of the bullet ? What percentage of the bullet’s initial kinetic energyis lo..
A large steam pipe is covered with 1.7-cm-thick insulating material of thermal conductivity 0.21 J/(s m °C). How much energy is lost every second when the steam is at 185 °C and the outside of the pipe has a temperature of 20°C? The pipe has a circum..
Define a spectrum and discuss how spectra are used in astronomy. Explain how emission and absorption lines are produced and discuss the information they convey. Describe how the spectrum of an object emitting thermal radiation can be used to find the..
a tube is open only at one end. a certain harmonic produced by the tube has a frequency of 715 hz. the next higher
In some places, insect "zappers" with their blue lights, are afamiliar sight on a summer's night. These devices use a highvoltage to electrocute insects. One such device uses an ac voltageof 4320V, which is obtained froma standard 120.0V outlet by..
A 10 nC point charge is at the center of a 2.0m x 2.0m x 2.0 mcube. What is the electric flux through the top surface of the cube
In a television set the power needed to operate the picture tube comes from the secondary of a transformer. Find the turns ratio Ns/Np of the transformer
a heavy box of school books (mass is 50kg) was set down at rest on an inclined street (theta = 30 degrees). Draw a force Diagram of the box
A basketball player is trying to make a half-court jump shot and releases the ball at the height of the basket. what speed must the player give the ball
An object with a mass of 0.527kg is attached to a long horizontal spring with a constant of 52.6kg/s2. At small angles with the same object, what length is required for a pendulum to have the same period
Batteries are rated in terms of ampere-hours (A · h). For example, a battery that can produce a current of 3.00 A for 5.00 h is rated at 15.00 A · h.
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