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The return trip over the same route takes 3.0 h because of heavy traffic. What is the average speed for the return trip?
A car goes around a curve on a road that is banked at an angle of 30.0°. Even though the road is slick, the car will stay on the road without any friction between its tires and the road when its
He work done by the gravitational force on the crate? The work done by the pull on the crate from the rope?
A concave makeup mirror is designed so the virtual image it produces is three times the size of the object when the distance between the object and the mirror is 19.5 cm. What is the radius of curva
The work delivered by the engine is used to operate a Carnot heat pump. The pump removes heat from the 842-K reservoir and puts it into a hot reservoir at a temperature T`. The amount of heat remove
After falling from rest from a height of 28 m, a 0.45 kg ball rebounds upward, reaching a height of 18 m. If the contact between ball and ground lasted 2.2 ms, what average force was exerted on the
A device for acclimating military pilots to the hog accelerations they must experience consist of a horizontal beam that rotates horizontally about one end while the pilot is seated at the other end
If the distance from the center of the moon to the surface of the planet is 2.000x10^5 km and the planet has a radius of 3425km, calculate the moons radial acceleration.
A convex mirror of radius of curvature 1.74 m is placed 0.22 m from a chess piece which is on the reflecting side of the mirror.
Identical situation with 70% efficency, the cable does not stretch, How much input force is required to perform the same output work?
Two 2.00cm -diameter disks spaced 1.80mm apart form a parallel-plate capacitor. The electric field between the disks is 4.80×10^5 . a.) How much charge is on each disk?
In what direction should the plane fly relative to the air so that it is moving directly east relative to the earth?
The plates are now pulled to a separation of 0.80 mm. What is the charge on the capacitor now?
A parallel plate capacitor with paper between the plates has an electric field of 9.31 104 V/m between the plates. The plates are 2.35 mm apart and the charge on each plate is 0.775 µC. Find t
An electron of a total energy 4.0 MeV moves perpendicular to a uniform magnetic field along a circular path whose radius is 3.9 cm. What is the strength of the magnetic field?
An 9.0 kg sled is initially at rest on a horizontal road. The coefficient of kinetic friction between the sled and the road is 0.40. The sled is pulled a distance of 3.0 m by a force of 42 N applie
What is the skateboard's velocity relative to the sidewalk at this instant? Be sure to include the correct algebraic sign with your answer.
A car (mass = 1090 kg) is traveling at 25.6 m/s when it collides head-on with a sport utility vehicle (mass = 2350 kg) traveling in the opposite direction. In the collision, the two vehicles come to
After skiding down a snow-covered hill on an inner tube, Ashley is coasting across a level snowfield at a constant velocity of +1.6 m/s. Miranda runs after her at a velocity of +5.2 m/s and hops on
The tackler holds onto the receiver, and the two move off together with a velocity of +1.83 m/s. The mass of the tackler is 95.9 kg. Assuming that momentum is conserved, find the mass of the receive
(a) What is the total momentum of the system of the two carts at this instant? (b) What was the velocity of the first cart when the second cart was still at rest?
Determine the momentum of the probe after the retrorocket ceases to fire.
Calculate the average decelerating impact force per unit area, if a person falling with a terminal velocity of 62.5m/s is decelerated to zero velocity over a distance of 1m.
What is the energy stored in such a cell membrane if the potential difference across it is 0.0679 V?
What percentage of the projectile's incident kinetic energy does the target (with the projectile in it) carry off after being struck?