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Ultraviolet light of wavelength 280 nm is used in an experiment on photoelectric effect with lithium (c = 2.5 eV) cathode. Find the maximum kinetic energy of the photoelectrons and (b) the stopping
A person of mass 79kg stands at the center of a rotating merry-go-round platform of radius 3.3m and moment of inertia 830kg*m^2. Calculate the angular velocity when the person reaches the edge
The pulmonary artery, which connects the heart to the lungs, is 8.5 cm long and has a pressure difference over this length of 450 Pa. If the radius of the artery is reduced by 14% , by what factor is
Calculate, using Newton's law of gravity, the magnitude of the force of attraction between the Earth and a mass of 16.000 kg on the Earth's surface
metal sphere of radius 32 cm has a net charge of 3.0 multiply.gif 10-8 C. What is the electric field at the sphere's surface
The motion of a particle is given by x= Asin^3(wt). What is the expression for the particle's velocity
As an Acapulco cliff diver drops to the water from a height of 48m, What is the diver's weight in newtons
A spherical drop of water carrying a charge of 11 pC has a potential of 590 V at its surface (with V = 0 at infinity). What is the radius of the drop
A farm tractor tows a 3550-kg trailer up a 18?incline with a steady speed of 3.0 m/s. What force does the tractor exert on the trailer
A conducting sphere of radius 0.26 m has a potential of 240 V (with V = 0 at infinity). What is the charge density on its surface
The drawing shows a block at rest on an incline. What is the static frictional force that acts on the block
A driver measures her "cold" tire gauge pressure to be 2.02 105 Pa. The measurement is made before driving, Find the final temperature of the air in the tires
Two boxes of mass 4.70 and 2.70 kg are in contact and are accelerated across a horizontal surface by an force of 28.24 N applied parallel to the surface and pushing on the lighter box. Find the acce
The big mall near Sally and Amy's city has extended their operating hours to accommodate the huge crowds expected for the After Thanksgiving Sale. How long were they in the mall
A proton (mass 1.67 x 10^27kg) is moving at 1.55 x 10^6m/s directly toward a stationary helium nucleus (mass 6.64 x 10^27kg). what is the helium's velocity
A heat pump has a coefficient of performance of 3.85 and operates with a power consumption of 7.14 103 W. How much energy does it extract from the outside air
4.48 L of an ideal gas is initially at a temperature of 303oC. While the volume is kept constant, Determine the new temperature of the gas
A liquid with a density of 1680 kg/m3 flows through a horizontal pipe with varying cross section. Determine the pressure in the second section
A playground merry-go-round has a disk-shaped platform that rotates with negligible friction about a vertical axis. determine how fast will the disk be turning
a 2 kg object attached to a horizontal string moves with constant speed in a circle on a frictionless horizontal surface. Find the radius of the circle
A 2.0m length of metal wire is connected to a 1.5 V battery, and a current of 5.0mA flows through it. What is the diameter of the wire
A Carnot engine operating between a warmer unknown temperature and a reservoir of boiling helium at 1.76 K has an efficiency of 75%. What is the warmer temperature
A Carnot engine extracts 550 J of heat from a high-temperature reservoir during each cycle, compute the efficiency of the engine
A sealed 88 m3 tank is filled with 4000 moles of ideal oxygen gas (diatomic) at an initial temperature of 270 K. find The final pressure of the gas
A sealed 37 m3 tank is filled with 6000 moles of ideal oxygen gas (diatomic) at an initial temperature of 270 K. find The initial pressure of the gas