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A 0.70 Kg block is hung from and stretches a spring that is attached to the ceiling. A second block is attached to the first one, and the amount that the spring stretches from its unstrained lenght triples. What is the mass of the second block?
1. explain what is the difference between 10 dbnbsp and 20db?2. an automatic focus camera is able to focus on objects
One side of our asteroid is constantly illuminated by the Sun while the other side remains in the dark. how might heat transfer from one side to the other
A photon Compton scatters off of a stationary electron at an angle of 60 °. Determine the initial wavelength of the photon
A 70kg block is pushed 5m up an incline against a friction force of 50N. The block is pushed to a height 1m above the ground. How much work is done by the person on the block pushing it up the incline
A wire coil is oriented so that its plane is perpendicular to a magnetic field of 0.58 T initially pointing to the left. What is the average induced emf, if the diameter of the coil is 49 cm
The intensity of sunlight at the top of the Earth's atmosphere is about 1360W/m^2. What is the total power emitted by the Sun
You have 18 speakers in the with a large room where there are many audiences , what is the best way to arrange the speakers to get the best less frequency ?
Two 0.80g spheres are charged equally and placed 2.0cm apart. When released, they begin to accelerate at 160m/s^2. What is the magnitude of the charge on each sphere?
A ball is thrown horizontally from the top of a building 19.0 m hight and lands 64.7 m from of the building, With what initial speed was the ball thrown
Consider the mass spectrometer shown schematically in the figure below. The electric field between the plates of the velocity selector is 2100 V/m, Calculate the radius r of the path for a singly charged ion with mass m = 2.29 10-26 kg
A student (m = 58 kg) falls freely from rest and strikes the ground. During the collision with the ground, he comes to rest in a time of 0.04 s. From what height did the student fall
A 266 kg log is pulled up a ramp by means of a rope that is parallel to the surface of the ramp. Find the tension in the rope
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