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The passengers in a roller coaster car feel 50% heavier than their true weight as the car goes through a dip with a 10 radius of curvature. What is the car's speed at the bottom of the dip? What is
An 8.0 m, 290 N uniform ladder rests against a smooth wall. The coefficient of static friction between the ladder and the ground is 0.75, and the ladder makes a 50.0° angle with the ground. How
Approximately how much will the gravitational attraction between the Moon and Earth change between now and 499 million years from now?
Suppose we have an infinitely long wire carrying a current of 2.5 A. It is bent into an L-shape extending into positive infinities along the x- and y- axes. Find the magnitude of the magnetic field
Air is streaming horizontally past a small airplanes wings such that the speed is 50m/s over the top surface and 30m/s past the bottom surface. the plane has a mass of 300kg and a total wing area o
The temperature difference between the inside and the outside is the same for the wall and the window. Of the total heat lost by the wall and the window, what is the percentage lost by the window?
A catcher "gives" with a baseball when catching it. If the baseball exerts a force of 519 N on the glove, so that the glove is displaced 10.0 cm, how much work is done by the ball?
A capacitor is connected across the terminals of a 440 Hz generator with an rms voltage of 24 volts. When another capacitor is connected in parallel, the current increases by .36 A. Find the capaci
A 0.600 block is attached to a spring with spring constant 16.0. While the block is sitting at rest, a student hits it with a hammer and almost instantaneously gives it a speed of 45.0. What is the
A ray of light enters the long side of a 45-90-45 prism and undergoes two total internal reflections, as indicated in the figure . The result is a reversal in the ray's direction of propagation. Fin
Given the wavelength of a certain laser is 514 nm and the power of the laser is 1.6 W, how many photons are released if the laser is used for 0.045 s during the surgery?
You're driving down the highway late one night at 17 {rm m}/{rm s} when a deer steps onto the road 45 {rm m} in front of you. Your reaction time before stepping on the brakes is 0.50 {rm s}, and the
A 100-N child is in a swing that is attached to ropes 2.20 m long. Find the gravitational potential energy associated with the child relative to her lowest position at the following times.
A package is dropped from a helicopter that is 28.0 m above the ground and flying straight upward at 8.02 m/s. Ignore air resistance. Find the maximum height above the ground reached by the package.
They form a system equivalent to a single spring of spring constant k. a). What is the effective spring constant k of the two-spring system?
In each cycle of its operation, a refrigerator removes 8 J of heat from the inside of the refrigerator and releases 22 J of heat into the room. How much work per cycle is required to operate this r
A 1100 kg car traveling at 27 m/s starts to decelerate and comes to a complete stop in 432 m. What is the average braking force acting on the car?
A person carries a long pole of mass 18 kg and length 5.0 m. Find the magnitude of the torque on the pole due to gravity.
A 30.0 mu F capacitor initially charged to 20.0 mu C is discharged through a 2.40 kOmega resistor. How long does it take to reduce the capacitor's charge to 9.00 mu C?
A singly charged positive ion has a mass of 2.27 10-26 kg. After being accelerated through a potential difference of 246 V, the ion enters a magnetic field of 0.440 T, in a direction perpendicular
A 40.0 kg person, standing 1.0 m from the axis, begins to run on the disk in a circular path and has a tangential speed of 2.40 m/s relative to the ground. Find the resulting angular speed of the di
A car battery with a 12 V emf and an internal resistance of 0.040 is being charged with a current of 50 A. What is the rate Pr of energy dissipation inside the battery?
A capacitor is formed from two concentric spherical conducting shells separated by vacuum. The inner sphere has radius 12.0 cm, and the outer sphere has radius 16.5 cm. A potential difference of 110
Andrea and Chuck are riding on a merry-go-round. Andrea rides on a horse at the outer rim of the circular platform, twice as far from the center of the circular platform as Chuck, who rides on an in
Two strings have different lengths and linear densities. They are joined together and stretched so that the tension in each string is 205 N. The free ends of the joined string are fixed in place. Fi