For a certain metal, light of frequency 7.24 × 10-14 Hz is just barely able to dislodge photoelectrons from the metal. (h = 6.626 × 10-34 J ∙ s, 1 eV = 1.60 × 10-19 J, e = 1.60 × 10-19 C)
A conducting rod is sliding on metal rails with velocity v. A magnetic field B is into the paper, the separation of the rails is L, and the resistance of the circuit is R. In what direction in the diagram is the current flowing in the resistor?
A network of converging and diverging stream channels within an individual stream system that are separated from each other by deposits of sand and gravel.
Capacitors in Combination: A 5.0-μF capacitor and a 7.0-μF capacitor are connected in series across an 8.0-V potential source. What is the potential difference across the 5.0-μF capacitor?
A laser beam is incident from the air at an angle of 30.00° to the vertical onto a solution of Karo syrup in water. If the beam is refracted to 19.24° to the vertical, what is the index of refraction of the syrup solution?
If a car is traveling eastward and slowing down, what is the direction of the acceleration on the car that causes it to slow down?<!--EndFragment--> pan>
A ball is dropped from a rooftop of a building and falls for two seconds. The acceleration of gravity is 9.8 m/s2 . The ball is referred to at the two-second time. The ball is referred to at the two-second time. The velocity is __________
A uniform, horizontal beam of length 6.0 m and weight 140 N is attached at one end to a wall by a pin connection (so that it may rotate). A cable attached to the wall above the pin supports the opposite end. The cable makes an angle of 60° with the horizontal. What is the tension in the cable needed to maintain the beam in equilibrium?
Projectile Motion: A projectile is fired from ground level with an initial speed of 55.6 m/s at an angle of 41.2° above the horizontal. Neglect air resistance, take upward as the positive direction, and use g = 9.8 m/s2.(a) Determine the time necessary for the projectile to reach its maximum height.(b) Determine the maximum height reached by the projectile.(c) Determine the horizontal and vertical components of the velocity vector at the maximum height.(d) Determine the horizontal and vertical components of the acceleration vector at the maximum height.
Graphical Analysis: The figure shows a graph of the velocity of an object as a function of time. What is the displacement of the object from 0 s to 6.0 s?<img src="https://sciemce.com/files/4/ppg__cp1pbb0313192044__f27g1q14g1.jpg" alt="" style="vertical-align: 0.0px;" height="217" width="368" />
First Law of Thermodynamics: A sealed rigid tank contains 29 moles of an ideal gas, at an initial temperature of 270 K. The pressure of the gas is increased until the final pressure equals 1.90 times the initial pressure. The heat capacity at constant pressure of the gas is 24.0 J/mol ∙ K. How much heat is absorbed by the gas during this process? (R = 8.31 J/mol ∙ K)
A wave is represented by the equation y(x, t) = 3.2 cm sin(1000 rad/s t - 50<img src="https://sciemce.com/files/4/52f189f32ee1447420.png" class="w-image" />x). Another wave is represented by the equation y(x, t) = 4.2cm sin(1000 rad/s t - 50<img src="https://sciemce.com/files/4/c098ec6636875b9920.png" class="w-image" />x). If the two waves interfere constructively, then what is equation that represents the coherent superposition of the two waves?
A CD is made with a plastic coating with index of refraction n and is used with a laser that produces a wavelength l in the plastic. Which of the following pit depths would produce the desired destructive interference in this situation?
A uniform rod of length 4L, mass M, is suspended by two thin strings, lengths L and 2L as shown. What is the tension in the string at the left end of the rod?
A particle (q = +5.0 μC) is released from rest when it is 2.0 m from a charged particle which is held at rest. After the positively charged particle has moved 1.0 m toward the fixed particle, it has a kinetic energy of 50 mJ. What is the charge on the fixed particle?
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