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A lumberjack (mass = 98 kilogram) is standing at rest on one end of a floating log (mass = 245 kilogram) that is also at rest. The lumberjack runs to the other end of the log, attaining a velocity of +3.8 m/s relative to the shore, and then hops onto an identical floating log that is initially at rest. Ignore any friction and resistance between the logs and the water.
(a) Find the velocity of the first log just before the lumberjack jumps off? (Indicate the direction of the velocity by the sign of your answers.)
(b) Find the velocity of the second log if the lumberjack comes to rest on it.
A subway train rounds an unbanked curve at 70 km/h. Find what is the radius of the turn
a heater and a motor are powered in parallel from the same 220v power supply. the motor draws 2A and the heater draws 17A. what is the total power dissipated by the dryer
What is the (a) “current” due to the electron orbiting in a circular path about the proton in a hydrogen atom? Take the orbital radius to be r = 0.0529 nm.] (b) What magnetic field strength does this “electron current” create at the proton locatio..
In a series R-L-C circuit, the phase angle is 40.5?, with the source voltage leading the current, Find the reactance of the inductor
Objects with masses of 100 kg and a 400 kg are separated with 0.340 m. Find the net gravitational force exerted by these objects on a 63.0 kg object placed midway among them. (Answer in Newton’s N)
a string is tied between two walls 8 m apart. which of the following is not an allowed standing wavelength for this
a major-league pitcher can throw a ball in excess of 40.7 ms. if a ball is thrown horizontally at this speed how much
A wire runs through a 0.7 T magnetic field as shown. The dashed lines represent the magnetic field, and the solid black line the wire. What is the magnitude of the current through the wire
A person with perfect pitch sits on a bus bench listening to the 445 Hz horn of an approaching car. If the person detects the frequency of 488 Hz, how fast is the car moving.
Consider the driven, damped harmonic oscillaror discussed. (a) Calculate the power dissipated by the damping force. (b) Calculate the average power loss, using the fact that the average of sin2( ?t+?) over a cycle is one-half.
When light is incident from air perpendicular to the surface of a certain medium, Find the speed of light in the medium
You are standing 1.15 m in fromt of a large shiny sphere that is 0.805 m in diameter. how tall is your image
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