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fuel aboard a rocket has a density of 2870 kgm3 and is ejected with a speed of 2650 ms if the engine is to provide a
a speedboat starts from rest and accelerates at 215ms2nbspfor 835 s at the end of this time the boatcontinues for an
the uniform beam below is 40meters long and has mass 300kg find the tension in the rope and the force exerted by the
two forces act on a 24-kg object one force has magnitude 65 n directed 59deg clockwise from the positive x-axis and the
a moving particle encounters an external electric field thatdecreases its kinetic energy from 9820 evto 7470 ev as the
an unusual spring has a restoring force of magnitude f 200 nmx 100 nm2x 2 where x is the stretch of the spring from
a 15 cm diameter suction cup is pressed to the ceiling a 51kg weight hangs from the center of the cup by string neglect
one mole of hydrogen one mole of nitrogen and one mole if oxygen are held in a 224103 cm3 enclosed vessel at 20c find
two cars cover the same distance in a straight line car a coversthe distance at a constant velocity car b starts from
an electric field of magnitude 2210 nc is applied along the xaxis calculate the electric flux through a rectangular
a uniform disk has a mass of 46 kg and a radius of 02 m the disk is mounted on frictionless bearings and is used as a
a uniform sign is supported against a wall at point p as shown in the figure if the sign is a square 090 m on a side
a certain person in a typical conversation speaks at a sound level of 63 db the music at a certain rock concert reaches
picture a wave with crests every 18m apart if a crestpasses you every 26s what is the propagation speed of the
two resistors connected in series with each other and a 10 vbattery are connected in a loop the voltage drop across the
the stretched length of a spring is 428 m a ribbon is tied aroundthe spring at a point near its center a pulse created
a 447-kilogram object is pulled 75 meters along a horizontal surface with a 130-newton force at 28o above horizontal
a spring is stretched between two posts when a pulse is produced at one end of the spring it makes 4 back-and-forth
a flower pot falls from the ledge of a building nbspa person in an apartment below coincidentally holding a stopwatch
the weight of the atmosphere above 1 m2 of earths surface is about 100000 n density of course become less with altitude
a wooden block with equal sides of 4 cm is floating in water if the density of the block is half the density of water
a rocket is launched at an angle of 540deg above thehorizontal with an initial speed of 97ms the rocket moves for 300 s
the weight of a block of metal is measured with a scale first in air then in water find the specific gravity of the
a charge of 219 microc is held fixed at the origin a second charge of 219 microc is released from rest at the position
an object is solid throughtout when the object is completely submerged in ethyl alcohol its appart weight is 152 n when