Normal curve approximation
A pair of dice is rolled 270 times. using the normal curve approximation, what is the probability that a total of 7 occurs?
A. at least 52 times?
B. between 41 and 63 time inclusive?
C. exactly 36 times?
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The inside temperature of the firebrick layer was measured at 600 C and the temperature of the outside of the insulation at 60C. What is the temperature drop across the steel layer?
When a 45 N force is applied tangentially to the disk, perpendicular to the radius, the disk acquires an angular acceleratrion of 80 rad/s^2. What is the mass of the disk?
A long bar of rectangular cross section, 0.4 m x 0.6 m on a side and having a thermal conductivity of 1.5 W/m x K, is subjected to the boundary conditions shown below. Two of the sides are maintained at a uniform temperature of 200 C.
Determine the pressure in bars and the enthalpy, in kJ/kg, at state 2. Determine the temperature, in degrees Celsius, and the enthalpy at state 3.
A centrifuge is used to remove solids from a 14.0 ppg mud using 8.33 ppg water. The mud and water enter the centrifuge at 40 gpm and 20 gpm, respectively. The underflow and overflow densities are 23.0 ppg and 10.0 ppg, respectively.
If the motorcycle travels over the crest at half speed found in Part A, find the ratio between the apparent weight of the motorcycle and its rider and their true weight.
An evacuated 150 L tank is connected to a line flowing air at room temperature, 25 degrees C, and 8 MPa pressure. The valve is opened, allowing air to flow into the tank until the pressure inside is 6 MPa. At this point the valve is closed.
A 100 W lightbulb generates 94 W of heat, which is dissipated through a glass bulb that has a radius of 2.8 cm and is 0.9 mm thick. What is the difference in temperature between the inner and outer surfaces of the glass?
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