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A lumberjack (mass = 98 kg) is standing at rest on one end of afloating log (mass = 290 kg)that is also at rest. The lumberjack runs to the other end of thelog, attaining a velocity of +3.5 m/s relative to theshore, and then hops onto an identical floating log that isinitially at rest. Neglect any friction and resistance between thelogs and the water.
a) What is the velocity of the first log just before the lumberjack jumps off? (Indicate the direction of the velocity bythe sign of your answers.)b) Determine the velocity of the second log if the lumber jack comes to rest on it.
a ball is hurled straight up at a speed of 15.0m/s, leaving the hand of the thrower 3.00 m above ground. What is the total distance traveled by the ball just as it passes the window the second time
Each second, a nuclear power plant generates 2000 MJ of thermal energy from nuclear reactions in the reactor's core. What is the maximum possible thermal efficiency of the power plant
A person on a rocket traveling at 0.50c (with respect to the Earth) observes a meteor come from behind and pass her at a speed she measures as 0.50c
An engine draws energy from a hot reservoir with a temperature of 1250 K and exhausts energy into a cold reservoir with a temperature of 355 K. What is the power output of this engine
Ultraviolet light is shone on a particular metal and the stopping potential is measured at the same time. What is the work function of the metal
A person with a near-point distance of 32 cm is able to get a usable magnification of 12 with a particular magnifying glass. What is the friend's near-point distance
A projectile is right at the edge of a 85 meter tall building . it is then fired with an initial speed of 25m/s at an angle 25 degrees above the horizontal and lands on the ground. how long will the projectile be in the air
A baseball is thrown horizontally off a cliff at 17 m/s. How far from the base of the cliff will the baseball hit the ground? The cliff is 81 m high
A 800kg , light-weight helicopter ascends from the ground with an acceleration of 3.50m/s2. What is the work done by the net force on the helicopter?
A soccer player kicks a ball from ground level with a velocity of 23.5 m/s 38.20 above the horizontal and it lands at ground level. determine the "hang time" of the ball
A +45?C point charge is placed 42cm from an identical +45?C charge. How much work would be required for an external force to move a +0.70?C test charge from a point midway
A car moving at 110 km/hr slams into a brick wall. If the hood of the car crumples 1.25 m during the crash, what is the magnitude of the acceleration of the car during the crash
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