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Consider a cell phone that emits electromagnetic radiation with a frequency of 1.0 GHz and with a power of 70 W.
(a) What is the electric field amplitude at a distance 1020 m away from the phone? Assume it radiates as a point source.
(b) If your ear is only about 10 cm from the source of radiation, what is the electric field amplitude at your ear as you use the phone? Again assume the phone radiates as a point source.
A grating has exactly 8000 lines uniformly spaced over 2.58 cm, What is the expected angle for the third-order maximum of the green line
A 0.700kg block is attached to a spring with spring constant 14.5N/m . While the block is sitting at rest, find The amplitude of the subsequent oscillations
the snow exerts a retarding force on the sled that points opposite to the direction of motion, and has a magnitude of 57 N. Find out the acceleration of the sled and child.
The ball rebounds straight upward to a height of 0.700 m. Illustrate what are the magnitude and direction of the impulse of the net force applied to the ball during the collision with the floor?
A note played on a piano is 4719 Hz. If the speed of sound is 347 m/s, what is the wavelength of the note?
In this problem, you will apply kinematic equations to a jumping flea. Take the magnitude of free-fall acceleration to be 9.80m/s^2. What is its initial velocity as it leaves the ground
Force F = (-5.0 N) i hat + (5.0 N) j hat acts on a particle with position vector r = (-3.0 m) j hat + (5.0 m) k hat. What is the angle between the directions of force and torque
Charges of 3.00 nC, -2.00 nC, -7.00 nC, and 1.00 nC are contained inside a rectangular box with length 1.00 m, width 2.00 m, and height 2.50 m. Outside the box are charges of 1.00 nC and 4.00 nC. What is the electric flux through the surface of th..
A saturated solution of strontium hydroxide is prepared in the excess solid Sr(OH)2 is allowed to settle. A 25.0mL aliquot of the saturated solution is withdrawn and transfer to an Erlenmeyer flask
A laser emits a narrow, circular beam of light. The radius of the beam is 1.37×10-3 m, and the power is 1.44×10-3 W
The index of refraction of air is 1, the index of glass 1.55 and the index of water 1.33. Characterize the air bubble as a point source.
We can roughly model a gymnastic tumbler as a uniform solid cylinder of mass 72.0kg and diameter 1.20m. What percent of his total kinetic energy is rotational
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