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An elastic cord is 67.0 cm long when a weight of 56.0 N hangs from it and is 87.0 cm long when a weight of 76.0 N hangs from it. What is the "spring" constant of this elastic cord?
a spherical balloon is filled with helium. The radius of the balloon is 25 cm. What mass of helium can it hold?
Covers the distance in the same time as car A. (a) Is car B"s final velocity smaller than, equal to, or greater than car A"s constant velocity?
A car is traveling north at 17.7 m/s. After 12s its velocity is 14.1 m/s in the same direction. Find the magnitude and direction of the car's average acceleration.
A potter's wheel -- a thick stone disk of radius 0.500 m and mass 125 kg -- is freely rotating at 50.0 rev/min. The potter can stop the wheel in 6.00 s by pressing a wet rag against the rim and exe
Common Mistakes with Newton"s 1st Law Motion doesn"t necessarily mean there"s a force acting. Is the velocity constant or changing?
Two conducting spheres are connected by a thin wire and are in electrostatic equilibrium. The diameter of the smaller sphere is 3.0 cm and the diameter of the larger one is 8.0 cm. If the smaller sp
A uniform bar,15 m long is balanced on a point placed at it's mid-point.a body of mass 55kg sits on one arm of the bar at a point 5 m away from the pivot. what mass can be placed 2 cm away from the
For some material the resistivity drops to near-zero below a certain temperature (the critical temperature) For such a material, current would continue to flow even if the potential is zero.
A motor scooter travels east at a speed of 13 m/s. The driver then reverses direction and heads west at 17 m/s. What was the change in velocity of the scooter?
The force of repulsion that two like charges exert on each other is 4.0 N. What will the force be if the distance between the charges is increased to 6 times its original value?
A string under a tension of 47.0 N is used to whirl a rock in a horizontal circle of radius 2.60 m at a speed of 21.0 m/s. The string is pulled in and the speed of the rock increases. When the stri
Since our insurance was cancelled after the last class "jump", you will explore this phenomenon using coffee filters. What does it mean for the Net Force on an object to equal zero?
A charge moves a distance of 2.8 cm in the direction of a uniform electric field havinga magnitude of 249 N/C. The electrical potential energy of the charge decreases by 84.9590 × 10-19
At this time its engine fails and the rocket proceeds to move as a free body.A. What is the rocket's maximum altitude (height)?
A spaceship travels between the two stars. B. Closer to the larger star C. It depends on the mass of the spaceship. A communications satellite orbits at 400 km above the surface of the Earth. What i
Bob, who has a mass of 82 kg , can throw a 300 g rock with a speed of 27 m/s . The distance through which his hand moves as he accelerates the rock forward from rest until he releases it is 1.0 m. W
A laser beam of wavelength 400 nm is directed at the moon through a 72 in telescope (i.e., the effective diameter of the aperture is 72 in). Estimate the area of the beam by the time it reaches the
How fast would it be moving after it had fallen a distance of 0.010 m? (Assume that the gravitational force is constant over the distance of the fall, and that the star is not rotating.)
How can astronomers measure the temperatures of the Sun and stars? How can astronomers tell what distant celestial objects are made of? How can we tell if a celestial object is approaching us or rec
A train is traveling up a 4.3 degree incline at a speed of 2.30m/s when the last car breaks free and begins to coast without friction. a) How long does it take for the last car to to come to rest mo
A tennis player places a 40 kg ball machine on a frictionless surface, as shown below. The machine fires a 0.052 kg tennis ball horizontally with a velocity of 30.6 m/s toward the north. What is th
What is the magnitude of the velocity of the boat as viewed by an observer on shore?
Reduce the naive estimate by precisely 55 orders of magnitude or more. Yet, if the dark energy is not quantum vacuum energy, what is it?
A person is trying to judge whether a picture (mass = 1.10 kg) is properly positioned by temporarily pressing against the wall. The pressing force is perpendicular to the wall. The coefficient of st