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A sample of hydrogen atoms is irradiated with light with wavelength 85.5 nm, and electrons are observed leaving the gas.
(a) If each hydrogen atom were initially in its ground level, what would be the maximum kinetic energy in electron volts of these photoelectrons?
(b) A few electrons are detected with energies as much as 10.2 eV greater than the maximum kinetic energy calculated in part (a). Explain.
Water from a dam falls on a turbine 30 m below at the rate of 60 m³/min. After
leaving the turbine wheel the water has a velocity of 9 m/s. What is the maximum
efficiency of the turbine? What is the maximum power developed?
.A crane lifts a 75kg mass a height of 8 m. Calculate the gravitational potential energy gained by the mass (g = 9.8 N/kg).
A 0.65 kg body when attached to a spring of force constant 225N/m oscillates with a maximum speed of 0.15 m/s. Find its amplitude and acceleration of the mass when it passes its equilibrium position.
What is the minimum diameter of a mirror on a telescope that would allow you to resolve objects with angular separation of 3.5x10^-5 radians ? Assume an average wavelength of 550 nm for the light received.
the propagation speed of sound wave (standing waves in a stopped pipe). Using the apparatus you used for Lab11, you strike
a tuning fork and find that the first harmonic/fundamental resonance is produced when the air column length or height or depth
at 0.166 m. If the speed of sound is 340 m/s, what is the frequency of sound wave produced by the tuning fork in Hz?
You are doing an experiment on the Ohm’s law. You connect an unknown resistor to a battery that can provide
the electric potential up to 10 V to form a closed loop circuit m8.5ade of the battery and the resistor. Using an
ammeter to measure the current coming out of the battery and using a voltmeter to measure the electric potential
difference across the resistor. In this experiment you vary the electric potential V provided by the battery from
0 V to 10 V in a step of 2 V. At each step you measure the current I out of the battery. When you plot V (V) vs.
I (A) on a graph, the data points spread evenly around a straight line whose slope is 8.5 V/A. Find the measured
resistance of the resistor in Ohmi f the resistor is rated at 10 Ohm by the manufacturer with a possible 5% error on the resistance,
calculate the %difference using your measurement and the rating in %
A uniform rod rotates in a horizontal plane about a vertical axis through a point
which is 2 m away from its center. The rod is 8 m long, weighs 8 N, and rotates at 100
rev/minute. Calculate
(a) Its rotational inertia about the axis of rotation.
(b) The magnitude of its angular momentum about the axis.
A uniform 2.5 kg disk of radius 30 cm is rotating around its central axis at an
angular speed of 72 rad/s. At time t=0, a man begins to slow it at a uniform rate until it stops
at t = 8 s.
(a) By time t = 5 s, how much work had the man done?
(b) For full 8 s, at what average rate did the man do work?
A 5.5 g bullet moving at 120 m/s strikes a thick wall. Assume that the bullet
undergoes a uniform deceleration and stops after penetrating 6 cm within the wall. Find
(a) The time taken by the bullet to stop.
(b) The impulse on the wall.
(c) The magnitude of the average force experienced by the wall
