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The length of a moving spaceship is 28.4 m according to an astronaut on the spaceship. If the spaceship is contracted by 14.2 cm according to an Earth observer, what is the speed of the spaceship?
What is the effective spring constant (that is, the ratio of force to change in length) of a copper cable that is 7.0 in diameter and 13 long?
A small ferryboat is 4.00 m wide and 6.00 m long. When a loaded truck pulls onto it, What is the weight of the truck
The electricity received at an electric substation has a potential difference of 2.80 10^5V. If the requires output is 440V, what must be the ratio of the turns of the step-down transformation.
A charge of 6.53mC is placed at each corner of a square .470 m on a side. Determine the direction of the force on each charge
A small boat is moving at a velocity of 3.35 m/s while it is accelerated by a river current perpendicular to the initial direction of motion. If current acceleration is 0.750 m/s^2, what will the new velocity of the boat be after 33.5 s.
if you decrease the hanging mass by a factor of four( 0.55 kg/4) but keep the linear mass density the same, by what factor does the fundamental frequency change
A car (m = 700.0 kg) accelerates uniformly from rest up an inclined road which rises uniformly, to a height, h = 42.0 m. Find the average power the engine must deliver to reach a speed of 20.3 m/s at the top of the hill in 24.5 s
The acceleration of a certain simple harmonic oscillator is given by a = - (15.8 m/s2) cos (2.51t). What is the amplitude of simple harmonic motion.
find the horizontal distance the ball would travel if the same spring were aimed 32.0 deg from the horizontal.
Two narrow slits 62um apart are illuminated with light of wavelength 480nm . What is an angle of the bright fringe in degrees.
What mass (in grams) of steam at 100°C must be mixed with 403 g of ice at its melting point, in a thermally insulated container, to create liquid water at 87°C? The specific heat of water is 4186 J/kg•K. The latent heat of fusion is 333 kJ/kg, and..
What is the maximum mass of ethyl alcohol you could boil with 1000 J of heat, starting from 15 deg C
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