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(a) The distance to a star is approximately 4.50 x 1018 meter. If this star were to burn out today, in how many years would we see it disappear?
years
(b) Find how long does it take for sunlight to reach Mars?
minutes
(c) Find how long does it take for a microwave radar signal to travel from Earth to the Moon and back?
s
(d) Find how long does it take for a radio wave to travel once around the Earth in a great circle, close to the planet's surface?
(e) Find how long does it take for light to reach you from a lightning stroke 9.1 km away?
the central maximum of a single-slit diffraction pattern has a width of 2.00 cm when measured on an observing screen
A 20 kg loudspeaker is suspended 2.0m below the ceiling by two cables that are 30 degrees from vertical. what is the tension in the cables
Light of wavelength 650 nm is incident above at an angle of 90 upon a glass plate as shown below. The glass plate rests on top of a second plate so that they touch at one end and are seperated by .0325mm at the other end as shown in the figure.
A laser emits light at wavelength ? = 637 nm in a beam of diameter 2.9 mm and at an energy-emission rate of 5.4 mW. At what rate per unit area does the detector absorb photons
at t1 1.00 s the acceleration of a particle moving at constant speed in counterclockwise circular motion is a13.00ms2i
what is the volume of an iron atom. What is the ratio of the mass density of girder A to the mass density of girder B.
A particle executes simple harmonic motion with an amplitude of 7.1 cm. At what displacement (in cm) from the midpoint of its motion will its speed equal one half of its maximum speed?
Monochromatic light falls on two very narrow slits0.042mm apart. Successive fringes on a screen6.50m away are 8.4cm apart near the center of the pattern. Determine the frequency of the light.
A paratrooper fell 370 m after jumping from an aircraft without his parachute opening. He landed in a snowbank, creating a crater 1.1 m deep, find the work done on him by air resistance as he fell
How strong is the electric field between the plates.
Two rocks are thrown off the edge of a cliff that is 15.0 m above the ground. The first rock is thrown upward, at a velocity of +12.0 m/s. The second is thrown downward, at a velocity of 12.0 m/s.
A 5C charge moves with velocity v = 10i + 3 j - 7 k m/sec in magnetic field B = 5i+ 13j - 1k tesla. find directions of magnetic force on the moving charge
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