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A spaceship travels at a constant speed from earth to a planet orbiting another star. When the spacecraft arrives, twelve years have elapsed on earth, and 9.2 years have elapsed on board the ship. How far away (in meters) is the planet according to the observers on earth?
what is the amplitude of the electric field vector of the satellite broadcast as measured at the surface of the earth? Use Eo=8.85*10^-12C/(V*m) for the permittivity of space
What must be the magnifying power of the eyepiece if the total magnification of the specimen is 100X
Moving a charge from point A, where the potential is 380V, to point B, where the potential is 190 V, takes 4.1×10-4 J of work. What is the value of the charge
An engine is built to extract power from the temperature difference in the ocean. what is the maximum theoretical efficiency of such an engine
The coefficient of kinetic friction for wood sliding on wood is 0.20. What is the final speed of the bullet
an ion enters a mass spectrometer which has a .21 t field perpindicular to electric field of 1.5 kvm and selects a
A particle with a charge of q = -5.40 nC is moving in a uniform magnetic field of vec{B}=( -1.24 T ) hat{z}. The magnetic force on the particle is measured to be vec{F}= ( -7.60×10-7 N )hat{y}. find v_x, the x component of the speed of the particl..
Wool is rubbed against a plastic ruler. how many electrons have been transferred to the ruler
A 0.15 kg arrow is firedhorizontally. The bowstring exerts a constant force pf 65 N on thearrow over a distance of 0.45 m. How much work is done by the bow string on the arrow
A particular radioactive sample undergoes 3.60x10^6 decays/s. What is the activity of the sample in the following in curies
An unusual spring has a restoring force of magnitude F = (2.00 N/m)x + (1.00 N/m2)x 2, how fast is it moving when the spring returns to its equilibrium length
A projectile is launched vertically from the surface of the Moonwith an initial speed of 1500 m/s. At what altitude is the projectile's speedone-half its initial value?(in km)
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