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Suppose 2.60 mol of an ideal gas of volume V 1 = 3.50 m 3 at T 1 = 290 K is
allowed to expand isothermally to V 2 = 7.00 m 3 at T 2 = 290 K. Determine:
a) the work done by the gas, [Ans = 4,350 J]
b) the heat added to the gas, and [Ans = take a guess]
c) the change in internal energy of the gas. [Ans = check definition of iso…]
A gas is enclosed in a cylinder fitted with a light frictionless piston and
maintained at atmospheric pressure. When 1250 kcal of heat is added to the gas, the
volume is observed to increase slowly from 12.0 m 3 to 18.2 m 3 . Calculate:
a) the work done by the gas, and [Clue = what type of work is this?]
b) the change in internal energy of the gas. [Clue = as with most questions in this
tutorial, use up the 1 st law of ThermoD, ∆U = Q – W]
Note. 1 kcal = 4.186 kJ
A car travels 100m as it accelerates from rest at 25m/s. Calculate the acceleration.
What type of electric cell would you recommend for practicals in schools
1)Deimos, a satellite of Mars, has an average radius of 6.2 km. If the
gravitational force between Deimos and a 2.0 kg rock at its surface is 2.5 ´10-2 N, what is the mass of Deimos?
2. A 2.08 ´ 104 kg meteorite is on exhibit in New York City. Suppose this meteorite and another meteorite are separated by 1.27 ´ 107m (a distance equal to Earth’s average diameter). If the gravitational force between them is 2.88 ´ 10-16 N, what is the mass of the second meteorite?
4. In 1989, a cake with a mass of 5.81 ´ 104 kg was baked in Alabama. Suppose a cook stood 25.0 m from the cake. The gravitational force exerted between the cook and the cake was 5.0 ´ 10-7 N. What was the cook’s mass?
5. The largest diamond ever found has a mass of 621 g. If the force of gravitational attraction between this diamond and a person with a mass of
65.0 kg is 1.0 ´ 10-12 N, what is the distance between them?
How fast will a 4 meter long car need to go in order to fit inside of a 3 meter long garage? (Give your answers in terms of c, the speed of light)
if an object in periodic motion completes one full cycle in 0.5 seconds, what is the frequency of the motion?
a. 0.5 hertz =
b. 1 herts =
c. 2 hertz =
Over the years, building have been built out of lighter materials. How has this affected the natural vibration frequencies of buildings and the problem of resonance due to passing trucks, airplanes, or natural sources of vibration?
A 50.0-kg child stands at the rim of a merry-go-round of radius 2.00 m, rotating with an angular speed of 3.00 rad/s.
(a) What is the magnitude of the child’s centripetal acceleration?
(b) What is the magnitude of the minimum force between her feet and the floor of the carousel that is required to keep her in the circular path?
(c) What minimum coefficient of static friction is required? Is the answer you found reasonable? In other words, is she likely to stay on the merry-go-round?
A lens system is composed of two lenses. Lens A has a refractive power of +9.25 D and lens B has a refractive power of −3.75 D. An object is located 235 mm in front of Lens A. The focused image of the lens system is located exactly 30 cm behind Lens B. The lenses are suspended in air. Calculate the distance between the two lenses.
