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A certain star is 18.6 light years away,
a. Find how long would it take a spacecraft traveling .950c to reach that star from Earth as measured by observers on earth?
b. Find how long would it take a spacecraft traveling .950c to reach that star from Earth as measured by observers on the spacecraft
c. Find what distance is travelled according to those on the spacecraft?
d. Find what will the spacecraft occupants compute their speed to be from the results of b and c?
A flashlight bulb with a potential difference of 6.0 V across it has a resistance of 8.5 W. How much current is in the bulb filament
Several people are riding in a hot air balloon. The combined mass of the balloon and the people totals 355 kg. how much mass should be dropped overboard so that the system acquires a net upward acceleration of .150 m/s2
What is the total charge of all the electrons in a 14 kg bar of zinc? (Zinc has 30 electrons per atom and an atomic mass of 65 u.)
A string 1.3 m long with a mass of 3.9 g is stretched between two fixed points with a tension of 93 N. Find the frequency of the fundamental on this string
We drop a 26-g ice cube (0C) into 1000 g of water (20C). Find the total change of entropy of the ice and water when a common temperature has been reached
A car travels east at 100 km/h for 0.8 h. It then travels 30.0° east of north at 127 km/h for 1.5 h. What is the average velocity for the trip
what is the acceleration of the wallet. If the contact between ball and ground lasted 1.6ms, what average force was exerted on ball.
The string will break if its tension exceeds 50-{rm N}. The stone is whirled in a horizontal circle on a frictionless tabletop; the other end of the string remains fixed. Find out the maximum speed the stone can attain without breaking the string.
An electric dipole consists of charges +e and -e separated by 0.76 nm. It is in an electric field of strength 2.50 10^4 N/C, What is the torque on the dipole when it is perpendicular to the field
A 2000kg truck pulls a 700 kg trailer. Starting from rest the truck begins accelerating with an acceleration of 4.5m/s^2. what force does the trailer exert on the car
The decibel level of ajackhammer is 125 dB relative to the threshold of hearing. Determine the sound intensity produced by the jack hammer
A 0.250 kg block is placed on a vertical spring (k = 5.0 x 10^3 N/m) and pushed downward, compressing the spring 0.10 m. As the block is free, it leaves the spring and continues to travel upward. What height above the point of release would the bl..
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