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in a volcanic eruption a 2400-kg boulder is thrown vertically upward into the air at its highest point it suddenly
a source of sound having a frequency of 330 hz is moving at 25ms if the speed of sound in air is 340 ms what is the
a 20-kilogram ball is released from a height of 10m above the beach the impression the ball makes in the sand is 50cm
a speeder is pulling directly away and increasing his distance from a police car that is moving at 251 ms with respect
a childs helium-filled balloon escapes at sea level and22oc when it reaches an altitude of 4000 m where thetemperature
given two identical uniform bricks each of length l if stacked in a staggered arrangment at the edge of a table what
the figure below shows an overhead view of a corridor with aplane mirror m mounted at one end a burglar bsneaks along
the rechargable battries for a labtop computer needs a smaller voltage than what a wall socket provides therefore a
a vacuum cleaner is plugged into a 1200-v socket and uses 30a of current in normal operation when the back enf
the input piston and output plunger of a hydraulic car lift areat the same level as shown in the drawing the
a two-stage rocket moves in space at a constant velocity of 4900 ms the two stages are thenseparated by a small
a 3600-omega resistor and a 11-microf capacitor are connected in series acrossa generator 600 hz 120 v rms determine
a rifle of mass 10 kg fires a 10 g bullet into a 3 kg block of woodwhich is suspended by a thin wire forming a
calculate the average induced voltage between the tips of the wings of a boeing 767 flying at 440 kmh above golden
a centrifuge in a medical laboratory rotates at an angular speed of 3650 revmin when switched off itrotates through 480
sailors use a technique called hiking out what purposedoes positioning themselves in this way serve if the wind
a 5kg box slides up a 10 m long frictionless incline at an angle of30 with the horizontal pushed by a 40-n force
a crate of eggs is located in the middle of the flatbed of a pickuptruck as the truck negotiates an unbanked curve in
a block of mass m is pushed up against a springcompressing it a distance x and the block is thenreleased the spring
a 18 kg child on a playground swing moveswith a speed of 30 ms when the 60 mlong swing is at its lowest point what is
a uniform disk of mass 10m and radius 30r can rotate freely aboutits fixed center like a merry-go-round a smaller
a 450 kg girl is standing on a 162 kg plank the plank originally at rest isfree to slide on a frozen lake which is a
a mass spectrometer has an adjustable magnetic field when the magnetic field is 7000e-2 t a singly ionized hydrogen
a dedicated sports car enthusiast polishes the inside and outside surfaces of a hubcap that is a section of a sphere
a transformer consisting of two coils wrapped around an iron coreis connected to a generator and a resistor as shown in