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a disk and a hoop have the same mass and same radius. They are put side-by-side at the top of an incline and released simultaneously. Explain why the disk reaches the bottom of the incline first.
An electronic advertising sign repeats a message every 82 seconds, day and night, for a week. how many times did the message appear on the sign
A projectile is shot directly away from Earth's surface. Neglect the rotation of the Earth. What multiple of Earth's radius RE gives the radial distance (from the Earth's center) the projectile reaches if (a) its initial speed is 0.550 of the escape ..
An object is five focal lengths from a concave mirror. How do the object and image heights compare
Suppose the ring rotates once every 4.40s . If a rider's mass is 56.0kg , with how much force does the ring push on her at the top of the ride
A 94 g stone is whirled in a horizontal circle on the end of a 73 cm long string. The stone takes 1.10 s to make each complete revolution. Conclude the angle that the string makes with the horizontal.
A 2.5-mC charge is on the y-axis at y=3.0 m and a 6.3-mC charge is on the x-axis at x=3.0 m. What is the direction of the electric potential at the origin
The man completely exhales and jumps into the deep end of a pool with a depth of 9 feet. Calculate the buoyant force of the water acting on the man with his breath completely exhaled
A coil of 150 turns of wire is in the form of a circle, carries a current of 63 mA, and sits in the center of a dipole magnet, What is the radius of the coils
Four point charges of magnitude 3.1 µC are at the corners of a square of side 5 m. Find the electrostatic potential energy if all the charges are negative.
A hydrogen atom in its first excited state absorbs a photon with an energy of 59.0 eV, What is the kinetic energy of the ejected electron
The length of a moving spaceship is 25.6 m according to an astronaut on the spaceship. what is the speed of the spaceship
Bill measures the rate at which the clock in Sam's spaceship runs and finds that it is one-third the rate at which the same clock runs when it is at rest
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