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A motorboat takes passengers between two ports on a river 20 km away. The motorboat maintains the same speed relative to the river both in the upstream and the downstream trips. If the upstream trip takes 1 hour while the downstream trip takes 50 minutes, what is the speed of the river?
Two point charges q_1 = 2.10 nC and q_2 = -6.10 nC are 0.100 {rm{ m}} apart. Point A is midway between them; point B is 0.080 {rm{ m}} from q_1 and 0.060 {rm m} from q_2 Take an electric potential to be zero at infinity.
A cart carrying a vertical missile launcher moves horizontally at the constant velocity of 30.1 to the right. It launches a rocket vertically upward. The missile has an initial vertical velocity of 40.33 relative to the cart.
A 0.11-kg rubber ball is dropped onto a table. The speed of the ball right before it hits the table is 5.9 m/s. what is the magnitude of the average force exerted on the ball by the table
Using a 677-nm wavelength laser, you form the diffraction pattern of a 0.111-mm wide slit on a screen. How far is the screen located from the slit
A 1070-N uniform beam is attached to a vertical wall at one end and is supported by a cable at the other end. A 1960-N crate hangs from the far end of the beam.
A rifle shoots a 4.50g bullet out of its barrel. The bullet has a muzzle velocity of 965 m/s just as it leaves the barrel. For how long a time is the bullet in the barrel
A potter's wheel having a radius 0.53 m and a moment of inertia of 11.4 kg, determine the effective coefficient of kinetic friction between the wheel and the wet rag
During a stage production of Peter Pan, the 53.5 kg actress playing Peter has to fly in vertically (descend). Calculate the tension in the wire supporting the actor
A 246 kg wooden raft floats on a lake. as a 85 kg man stands on the raft, it sinks 5.0 cm deeper into the water. When he steps off, the raft vibrates for a while.
Mary Healy, the young woman with severe vaginal bleeding, is admitted to emergency room. She is three months pregnant, and physician is concerned about the volume of the blood she is losing.
The woman then starts walking clockwise around the rim at .75 rad/s. in what direction and with what angular speed does the turntable rotate.
A person runs with speed v toward a tunnel of length L, When the person and the photon eventually meet, the person's location is a fraction f along the tunnel. What is f
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