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A gas in a cylinder expands from a volume of 0.120 m3 to 0.320 m3. Heat flows into the gas just rapidly enough to keep the pressure constant at 1.60 x 105 Pa during the expansion. The total heat added is 1.15 x 105 J. (a) Find the work done by the gas. (b) Find the change in internal energy of the gas.
A gas undergoes two processes. In the first, the volume remains constant at 0.250 m3 and the pressure increases from 2.00 x 105 Pa to 6.00 x 105 Pa. The second process is a compression to a volume of 0.120 m3 at a constant pressure of 5.00 x 105 Pa. (a) In a pV-diagram, show both processes. (b) Find the total work done by the gas during both processes.
Two moles of an ideal gas are heated at constant pressure from T = 27°C to T = 117°C. (a) Draw a pV-diagram for this process. (b) Calculate the work done by the gas.
A 70 kg father and a 50-kg mother are at opposite ends of a seesaw 6 m long. Where should their 25-kg son sit so that the seesaw is balanced at the center?*
A 2.0 N, 2.0m long uniform rod is used to suspend various weights. A 2N weight is suspended on one end (point A) and a 5N weight is suspended on the other end (point B). A 2.0N object is suspended 0.5 m from point A and a 1.0N is hanged 0.8 m from point B. How far from the center of the rod shall a 3N weight be placed to balance the rod?*
A student opens his laptop with a 2.5 N force at an angle of 70 degrees against the horizontal. Find the torque on the cover of the laptop if the laptop is 20 cm wide.*
A common Ethiopian cities speed limit is 30km/hr.what is this speed in miles per hour?
Suppose the space between the plates of the capacitor is filled
with equal thickness of the same dielectrics but arranged as
shown in the figure. Each having an area of 8.0x10-4 m2 and
separated from each other by 5.0 mm. Half of the space between
the plates is filled with glass and the other with mica. What is its
capacitance?
A block moves along a horizontal surface with a 0.61 coefficient of kinetic friction. The block is pulled by a rope that exerts a 162 N tension force at 370 above the horizontal. Draw the FBD. Determine the kinetic friction.
At the surface of Jupiter’s moon Io the acceleration due to gravity is g=1.81 m/s2 . A watermelon weighs 44.0 N at the surface of the earth. a) What is the mass on the earth’s surface? b) What are its mass and weight on the surface of Io?
