The inside temperature of a house is 65
When the temperature outside the house is 35
the furnace supplies 100 Joules per hour to keep the inside of the house warm. If the temperature outside the house goes to 50
then what is the fuel consumption of the furnace?
A. 38 Joules per hour
B. 42 Joules per hour
C. 50 Joules per hour
D. 56 Joules per hour
E. 61 Joules per hour
C. 50 Joules per hour
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A projectile is launched with speed v at an angle ?, the angle being less than 45º. What other angle would give the same range for this projectile launched at the same speed v?
a. 2? b. 0.5? c. 90° – ? d. 90º – 0.5?
Energy Conservation With Conservative Forces: A bead is moving with a speed of 20 m/s at position A on the track shown in the figure. This track is friction-free, and there is no appreciable air resistance. What is the speed of the bead at point C?
A. 0 m/s B. 34 m/s C. 69 m/s D. 20 m/s E. We cannot solve this problem without knowing the mass of the bead.
A 10-m plank with a mass of 80 kg is being moved by rolling it over two cylindrical logs, each with a mass of 10 kg and a radius of 20 cm, placed 2 m from either end of the plank
As the plank is pushed, the logs roll on the ground without slipping, and the plank does not slip on the rollers. A force of 250 N is applied to the plank. What is the speed of the plank after it has moved 2 m, starting from rest? A) 1.87 m/s B) 2.53 m/s C) 3.43 m/s D) 3.54 m/s E) 2.37 m/s
Order the following situations according to the magnitude of the magnetic field at the point P. Order from highest to lowest
1.ABCD
2.ADBC
3.BDAC
4.CADB
5.DABC
6.None of the above