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Light from the sun arrives at the earth, an average of 1.50×1011 m away, at the rate of 1.40×103 W/m2, for an area perpendicular to the direction of the light. Approximate sunlight as monochromatic with a frequency of 4.60×1014 Hz. How many photons fall per second on each square meter of the earth's surface directly facing the sun? What is the power output of the sun? How many photons per second does it emit? How many photons per cubic meter are there near the earth?
The maximum speed of a 3.7-kg mass attached to a spring is 0.67 m/s , and the maximum force exerted on the mass is 12 N. What is the amplitude of motion for this mass
A 400-kg piano slides 3.6 m down a 28 degree incline and is kept from accelerating by a man who is pushing back on it parallel to the incline. Determine the force exerted by the man
A 0.21-kg ball on a stick is whirled on a vertical circle at a constant speed. When the ball is at the three o'clock position, the stick's tension is 18 N. Find the tension in the stick when the ball is at the twelve o'clock position
A closed system is observed to have 17 objects in it. Initially, the total energy of the system is 4714 J. After 1.7 h have passed, how much total energy will the system contain
question1a robot arm that controls position of the video camera in an automated surveillance system is manipulated by a
The energy eigenstates of the hydrogen atom are described by Schrödinger wavefunctions ?(r), where the energy of the ground state ?100(r)=-13.6eV. Determine the expectation value of the energy
A positive charge +q1 is located to the left of a negative charge -q2. On a line passing though the two charges, there are two places where the total potential is zero. What is the distance between the charges
The energy flow per unit time per unit area (S) of an electromagnetic wave has an average value of 601 mW/ m2
He is unable to get to the other side because of a lack of friction between his shoes and the ice. How long does it take him to reach the south shore
Intuitively, the man will not catch the bus unless he is running fast enough. In mathematical terms, there is a constraint on the man's speed so that the equation above gives a solution for that is a real positive number.
A hydrogen atom in its ground state is excited to the n = 5 level. It then makes a transition directly to the n = 2 level before returning to the ground state. What are the wavelengths of the emitted photons
An electron accelerated from rest through a voltage of 350V enters a region of constant magnetic field. If the electron follows a circular path with a radius of 28cm, what is the magnitude of magnetic field.
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