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Platinum has a work function of 6.4 eV. Radiation with wavelength 150 nm and intensity 1.3 W/m2 is directed at a platinum surface. (a) Discover the maximum kinetic energy of the ejected electrons. (b) If 1.0% of the photons striking a1.0 cm2 area of platinum eject electrons, how many electrons are emitted per second from that part of the surface?
The heating element of a clothes dryer has a resistance of 11 ? and is connected across a 240-V electrical outlet. What is the current in the heating element
A block of mass m =2.00kg is released from rest at h=0.300 m from the surface of a table at the top of a theta=50.0 degree incline as shown below. How far from the table will the block hit the floor
Two point charges q1 = 4.0 ?C and q2 = -8.0 ?C are placed along the x-axis at x1 = 0 m and x2 = 0.20 m, find the electric potential energy of this system of charges
The pendulum in the figure consists of a uniform disk with radius r = 15.0 cm and mass 420 g attached to a uniform rod with length L = 380 mm and mass 240 g. Calculate the rotational inertia of the pendulum about the pivot point
A 45.0-kg girl is standing on a 158-kg plank. The plank, originally at rest, is free to slide on a frozen lake, which is a flat, frictionless surface. What is the velocity of the plank relative to the surface of ice
A jet of water squirts out horizontally from a hole near the bottom of the tank, what is the height h of the water level in the tank
There are four charges, each with a magnitude of 2.0μC. Two are positive and two are negative. The charges are fixedto the corners of a 0.30 m square, one to a corner, in such a waythat the net force on any charge is directed toward the center oft..
A rocket with mass 1000kg accelerates upwards at a rate of 20m/s (a) How long does it take before it is going at the speed of sound (334 m/s)? (b) How long does it take before the rocket is at a height of 100km?
An airplane pulls a 24 kg banner on a cable as depicted in the figure below. When the plane has a constant cruising velocity the cable makes an angle of ? = 26°. What is the drag force exerted on the banner by the air
The perihelion distance from the sun for the planet Uranus is 2.750E9 km; the aphelion distance is 3.000E9 km. Calculate the eccentricity of the orbit of Uranus
Jill has just gotten out of her car in the grocery store parking lot. The parking lot is on a hill and is tilted 3 degrees. How far has the cart rolled before Jill catches it
A truck moves 70 m east, then moves 120 m west, andfinally moves east again a distance of 90 m. If east ischosen as the positive direction, what is the truck's resultant displacment
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