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2450 nm ultraviolet light strikes a metal plate and ejects electrons having kinetic energy e 179 ev calculate the
a marksman fires a bullet mb 500g horizontally with a velocity of 300ms from a rifle mr 300kg what is the recoil
an airplane propeller is 214m in length from tip to tip with mass 107kg and is rotating at 2900rpm revmin about an
a 70 kg block hangs from a spring extending it 22 cm from its unstretched position what is the spring constant the
if the work function of a metal is 449 ev what is the maximum wavelength of light that can be used to observe the
a tree loses water to the air by the process of transpiration at the rate of 110 gh this water is replaced by the
astronaut spud nick is space-travelling from planet x to planet y at a speed of 059 c when he is precisely halfway
an air conditioner is used to keep the interior of a house at a temperature of 20 c while the outside temperature is 35
in a steam turbine steam is flowing at 20kgs at the inlet of the turbine specific enthalpy is 2800kjkg velocity 20ms
calculate the wavelength of light emitted from a hydrogen atom when it undergoes a transition from the n11 level to n5
when a high-power laser is used in the earths atmosphere the electric field associated with the laser beam can ionize
consider a cylindrical segment of a blood vessel 350cm long and 240mm in diameter what additional outward force would
find the acceleration due to gravity of a steel ball in water and in mercury density of steel ball is 786 gcm3 density
a typical frequency used by gsm cell phones is 6110 mhz what is the wavelength of this
1 calculate the amount of energy it takes to melt a waxcalculate the amount of energy in joules needed to melt a wax
a stick is resting on a concrete step with 25 of its length hanging over the edge a single ladybug lands on the end of
a 80g 39-cm-long rod hangs vertically on a frictionless horizontal axle passing through its center a 14g ball of
a family goes on vacation for one week but forgets to tun off an electric fan that consumes electricity at the rate of
does a atom gain or lose energy going from lyman series to balmer series does a atom gain or lose energy going from
beams of high-speed protons can be produced in guns using electric fields to accelerate the protons a what acceleration
the distance from the earth to the nearest stars is measured in light-years convert the distance 54 light-years to si
an electron with a speed of 700 108 cms enters an electric field of magnitude 100 103 nc traveling along the field in
a 1200 kg car whose transmission is in neutral is coasting down a 10 hill with its brakes used to maintain a constant
an object of unknown mass is attached to an ideal spring with force constant 130 and is found to vibrate with a
an engine with an output of 300 w has an efficiency of 350 it works at 1300 cycless how much work is done in each