8. Suppose that an object initially having a temperature of 20 degrees is placed in a large temperature controlled room of 80 degrees and one hour later, the object has a temperature of 35 degrees. What will its temperature be after three hours? (Make sure to show your initial differential equation)
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- 10 pts Question 4 What is the electric held strength in units of N/C if the flux through a 2.0m by 1.0m rectangular surface is 817 Nm2/C, if the electric field is uniform, and if the plane of the surface is at an angle of T/3 radians with respect to the direction of the field? No decimal is required and maximum of 5% of error is accepted in your answer.6. A clean tube of internal diameter 3 mm is immersed in a liquid with a coefficient of surface tension 0.48 N/m. The angle of contact of the liquid with the glass can be assumed to be 130° The density of the liquid is 13,600 kg/m^3? What would be the level of the liquid in the tube (in mm) relative to the free surface of the liquid outside the tube. (2 decimal places)(5) As shown in the image, an air space above a long tube is pressurized to 50 kPa vacuum. Water (15°C) from a reservoir fills the tube to a height h. If the pressure in the air space is changed to 25 kPa vacuum, will h increase or decrease, and by how much? Assume atmospheric pressure is 100 kPa. acuum, will h increase or descrease and by how much? ime atmospheric pressure is 100 kPa. PROBLEM h Air space Water
- 2. A steel tape with a coefficient of linear expansion of 0.0000116/degree Celsius is known to be 50m long at 20 degree Celsius. The tape was used to measure a line which was found to be 532.28m long when the temperature was 35 degree Celsius. Determine the correct length of the line. (Input magnitude only, two decimal places.) *According to Newton's law of cooling, the rate at which a substance cools in alir is directly proportional to the difference between the temperatures of the substance and that of air. If the temperature of the air is 30° and the substance cools from 100* to 70* in 15 minutes, how long will it take to cool 100* to 50? a. 33. 59 min C. 41.74 min d. 45.90 min b. 43.80 min⦁ A steel tape with coefficient of linear expansion of 0.0000116/0 C is known to be 50 m long at 20 C. The tape was used to measure a line, when the temperature was 30 C. If the corrected distance was found to be 582.424m., Find the measured distance.
- A steel tape, with a coefficient of linear expansion of 0.0000116/C, is known to be 50 meters long at 30°C. The tape was used to measure a line was found to be 15532.28 meters long when the temperature was 27°C. Determine the following: a. Temperature correction per tape length b. Temperature correction for the measured line c. Correct length of the lineSituation 2 An object with a shape of a cube with 280mm on each side, and weighing 425N is lowered into a tank containing a layer of water over a layer of mercury. a) Determine the position of the bottom block (height if the block submerged in mercury) above the mercury, when it has reached the equilibrium, in mm.:Pick up the incorrect statement from the following The straight distance between end points of a suspended tape is reduced by an amount called the sag correction While measuring a distance with a tape of length 100.005 m, the distance to be increasing by 0.005 m for each tape length A 100 m tape of cross section 10 mm x 0.25 mm stretches about 10 mm under 5 kg pull An increase in temperature causes a tape to increase in length and the measured distance is too large
- manage your time. Problem 1: (50 points) A 150 mm-diameter water jet sticks horizontally the 30° deflector as shown in figure below. The deflector covers a 125mm diameter hole in the tank wall on the right side. What is the maximum water depth H in the right tank that can be maintained the water without leaking? water 30 3m 150 mm dia water 125 mm dia jet 30Using area as your variable, suggest ways to cool freshly baked cookies faster.9- A bowling ball of mass 7.5 kg travelling at 10 m sec rolls off a horizontal table 1 m high. (Assume the acceleration due to gravity is 10 m sec, and the effects of air resistance may be ignored unless otherwise stated.) a Calculate the ball's horizontal velocity just as it strikes the floor. b What is the vertical velocity of the ball as it strikes the floor? c Calculate the velocity of the ball as it reaches the floor. d What time interval has elapsed between the ball leaving the table and striking the floor? e Calculate the horizontal distance travelled by the ball as it falls.