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a heat pump has a coefficient of performance of 385 and operates with a power consumption of 691 103 wa how much energy
a laserpointer has a beam intensity of 55 wm2 and a beam radius of 21 mm a first grader attempts to use it to move a
a playground merry-go-round has a radius of 30 m and a rotational inertia of 600 kgmiddotm2 it is initially spinning at
a heat pump is essentially an air conditioner installed backward it extracts energy from colder air outside and
an ideal carnot freezer in a kitchen has a constant temperature of 263 k whereas the air in the kitchen has a constant
a a laser beam with wavelength 6328 aring is incident normal to the plane of a diffraction grating the grating has
a copper wire is 600 m long and has a cross-sectional area of 200 10-4 m2 this wire forms a one turn loop in the shape
the force vector a has a magnitude of 980 newtons n and points due east the force vector b has a magnitude of 111 n and
each day the human heart takes in and discharges about 7500 l of blood if the heart does 140 kilojoules kj of work in
a 220 kg child is riding a playground merry-go-round that is rotating at 400 rpm what centripetal force must she exert
a sphere of copper that has a radius of 5 cm is compressed uniformly by a force of 30 108 n calculate the change in
a satellite of mars called phobos has an orbital radius of 94 106 m and a period of 28 104 s assuming the orbit is
a square wire loop 110 cm on each side carries a clockwise current of 160 apart a find the magnitude of the magnetic
water flows through a horizontal tube that is 350 cm long and has an inside diameter of 120 mm at 0400 mls find the
a non-conducting charged sheet and a non-conducting sphere radius b are arranged as shown in the figure the right-most
an elephant that has a mass of 7000 kg evenly distributes her weight on all four feeta if her feet are approximately
a flywheel comprises a uniform circular disk with a mass of 1010 kg and a radius of 11 m it rotates with an angular
calculate the buoyant force that would be exerted on a wood object that is 26g and has a volume of 316cm3 and a density
a 827 cm3 gold nugget and a 827 cm3 aluminum block are immersed in water which object experiences the greater buoyant
a turntable that spins at a constant 730rm rpm takes 300rm s to reach this angular speed after it is turned on find its
a 30000-kg freight car is coasting at 0850 ms with negligible friction under a hopper that dumps 110000 kg of scrap
an 81 kg running back moving at 40 ms makes a perfectly inelastic collision with a 105 kg linebacker who is initially
n 1730 kg car stopped at a traffic light is struck from the rear by a 865 kg car the two cars become entangled moving
a metal disk rotates on an axis through its center i 02 kgmiddotm2 with angular velocity -33 radianss and a torque
bored a boy shoots his pellet gun at a piece of cheese that sits keeping cool for dinner guests on a massive block of