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The North Star (Polaris) is a distance 431 ly away and radiates energy in the form of light at a rate of 8.6 x 1029 W.
What is the intensity of this light at the Earth?
A railroad car with a mass of 2.46 x 10^4 kg moving at 3.25 m/s collides and joins with two railroad cars already joined together, each with the similar mass as the single car and initially moving in the same direction at 1.49 m/s.
A hollow spherical shell has mass 8.00 and radius 0.225. It is originally at rest and then rotates about a stationary axis that lies along a diameter with the constant acceleration of 0.905. What is the kinetic energy of the shell after it has turned..
A guitar string of diameter 0.6 mm and length 0.74 m is subject to a tension of 140 N. what is Young's modulus of the string
A simple harmonic oscillator consists of a block of mass 2.2kg attached to a spring of spring constant 26N/m. When t = 1.60 s, the position and velocity of the block are x = 0.128m and v = 3.170 m/s. (a) What is the amplitude of the oscillations? ..
How many electrons should be transferred from the plate. When you enter your answer, leave off the unit rm dB.
Calculate the mass of the sun from the radius of the earth's orbit (1.50×1011 m), the earth's period in its orbit, and the gravitational constant G, What is the density of the sun
Heat flows into an ideal gas at a constant volume. The pressure increases from 1.5 atm to 5.5 atm. What is the total heat flow of the process
A 4 ohm resistor and 10 ohm resistor are connected in series. how much current will flow through the circuit
A Ferris wheel with a radius of 14.0 m rotates at a constant rate, completing one revolution in 30.0 s. What is the apparent weight of a 60 passenger when she is at the bottom of the wheel.
How much energy is given to the cell during this pulse. How many years would it take the earth to move 1.0 mm at this speed.
A 0.25 m long wrench is placed around a bolt and a 20 N force is applied halfway along the wrench at an angle of 30 degrees, What is the torque (in Nm) applied to the bolt from this force
A weight of 45.0 N is suspended from a spring that has a force constant of 180 N/m. Determine the maximum value of the driving force
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