Physics Kinematics Level: Misc Level
A 2000Kg car is slown down uniformly from 20. 0m /s to 5.00 m/s in 4.00s. (A) What average force acted on the car during that time? and (B) How far did the car travel during that time?
Physics Force & Laws Of Motion Level: Misc Level
The distance between two telephone poles is 50 m. When a 1.00Kg bird lands on the telephone wire midway between the poles, the wire sags 0.200 m. Draw a free body diagram of the bird. How much tension does the bird produce in the wire? (Ignore the weight of the wire)
Physics Ray Optics Level: Misc Level
the sum of the volumes of two cubes is 2000 cu. Inches. What should their edge lengths be in order to maximize the sum of their surface areas?
Physics Properties Of Matter Level: Misc Level
Consider a point in the ocean about 8.60 km deep. The pressure at that point is huge, about 8.88 107 N/m2.
(a) Calculate the change in volume of 1.00m3 of water carried from the surface to this point in the ocean.---m3
(b) The density of water at the surface is 1.03 103 kg /m3. Find its density at this point.--kg/m3
Physics Force & Laws Of Motion Level: Misc Level
A 46.0 kg ballet dancer stands on her toes during a performance with four square inches (26.0 cm2) in contact with the floor. What is the pressure exerted by the floor over the area of contact in the following cases? If the dancer is leaping upwards with an acceleration of 4.00 m/s2.---Pa
Physics Properties Of Matter Level: Misc Level
When water freezes, it expands about 8.20%. What would be the pressure increase inside your automobile,s engine block if the water in it froze? (The bulk modulus of ice is 2.00 109 N/m2.)---Pa
Physics Force & Laws Of Motion Level: Misc Level
If the shear stress in steel exceeds about 3.70 108 N/m2, the steel ruptures.Determine the shearing force necessary to punch a 1.00 cm diameter hole in a steel plate 0.450 cm thick.-----N
Physics Properties Of Matter Level: Misc Level
A volume of 50.0 liters of oxygen at 10.0 %C and an absolute pressure of 1.88 atm is compressed to 36.6 liters, and at the same time the temperature is raised to 80%C. What will the absolute pressure be now?
Physics Heat & Thermodynamics Level: Misc Level
Calculate the latent heat of fusion of ice from the following data for ice at 0%C added to water in a calorimeter.(Give your result to three signicant figures).
a. Specifiic heat of the calorimeter 0.100 cal (gm%C)
b. Mass of the calorimeter 70.0 gm
c. Mass of calorimeter plus water 507.0 gm
d.Mass of ice added 169.0 gm
e.Initial temp of water plus calorimeter 40.0%C
f. Finial temp of the mixture 7.0% C
Lf=
Physics Heat & Thermodynamics Level: Misc Level
An engine operates at half its theoretical (carnot) efficiency between 545%C and 310% C. What is the efficiency engine? efficiency=
Physics Heat & Thermodynamics Level: Misc Level
An adiabatic process is one in which the system being considered
a. remains at constant temperature
b. remains at constant pressure
c. has no heat flow into or out of it during the process
d.underoes no change in internal energy
e. does no work, and has no work done on it
Physics Heat & Thermodynamics Level: Misc Level
A 1- kg chunk of ice at 0 degrees C melts, absorbing 80,000 cal of heat in the process. Which of the following beast describes what happens to this system?
a. increased entropy
b.lost entropy
c. entropy maintained constant
d.work converted to energy
Physics Heat & Thermodynamics Level: Misc Level
The absolute temperature of an ideal gas is directly proportional to which of the following properties(when taken as an average) of the molecules of that gas?
a. speed
b.momentum
c.mass
d.kinetic energy
Physics Heat & Thermodynamics Level: Misc Level
In a cloud formation, water vapor turns into water droplets which get bigger and bigger until it rains. This will cause the temperature of the clouds to
a. get warmer
b. get cooler
c. be completely unaffected
d. there is no air in clouds
Physics Heat & Thermodynamics Level: Misc Level
Which of the following processes of heat transfer may take place in a vacuum?
a. Conduction
b.Convection
c.Radiation
d.Induction
e.None of the above
