Physics Current Electricity Level: Misc Level
A certain brand of hot dot cooker applies a potential difference (120V) to opposite ends of the hot dog and cooks by means of the joule heat produced. If 60 kJ is needed to cook each hot dog. what current is needed to cook four hot dogs simultaneously in 3.0 minutes?
a. 11A
b. 2.8 A
c. 8.3 A
d. 2.1 A
e. 3.6 A
Physics Current Electricity Level: Misc Level
Most telephone cables are made of copper wire of either 24 or 26 gauge.If the resistance of 24-gauge wire is 137 Q/mile and the resistance of 26- gauge wire is 220 Q/mile, what is the ratio of the diameter of 24- gauge wire to that of 26- gauge wire?
a. 1.6
b.1.3
c. 0.62
d. 0.79
e. 0.88
Physics Current Electricity Level: Misc Level
A capacitor of unknown capacitance C is charged to 100 V and then connected across an initially uncharged 60-uF capacitor. If the final potential difference across the 60-uF capacitor is 40 V, determineC.
a. 49 uF
b. 32 uF
c. 40 uF
d. 90 uF
e. 16 uF
Physics Kinematics Level: Misc Level
How much faster is a car final speed if you double the gravitional acceleration?
Physics Kinematics Level: Misc Level
If you add 2 m/s to a car,s starting speed would it increase the finalspeed by 2 m/s? should it?explain.
Physics Kinematics Level: Misc Level
If you can build a roller coaster to demonstrate acceleration can youbuild one in which the rider feels a lot of acceleration?explain.
Physics Ray Optics Level: Misc Level
Define utility .Describe the law of diminishing marginal utility.
Physics Properties Of Matter Level: Misc Level
A metal wire increases its length by 2 mm when subjected to a tensile force.What elongation can be expected from this same force if the diameter of the wire was reduced to 1/2 of its initial value? Suppose the metal wire maintains its diameter, but doubles its length. What elongation would be expected from the same load?
Physics Waves And Oscillations Level: Misc Level
On a cold winter day, a car is moving at 20 m/s along a straight road, sounding its 500 Hz horn. You are standing at the side of the road. What frequency do you hear as the car is a) approaching you and b) Receding from you?
Physics Properties Of Matter Level: Misc Level
A solid cylindrical steel column is 6m long and 8cm in diameter. What is the decrease in length if the column supports a 90,000 kg load?
Physics Force & Laws Of Motion Level: Misc Level
Consider a flat surface with a coefficient of friction of .20 with a 2.0 kg mass And a 3.0 kg mass connected together with a 6.0 kg mass along a slant as shown below. The coefficient of friction on the slant is zero. Calculate the acceleration of the system.
Physics Waves And Oscillations Level: Misc Level
Find the sound level in decibels of a sound wave that has an intensity 10x105 W/m^2.
Physics Waves And Oscillations Level: Misc Level
Find the intensity of a sound that has an intensity level of 35.0 dB.
Physics Work,Power & Energy Level: Misc Level
When one gram of gasoline burns in a car,s engine, the amount of energy given off is approximately 1.03x10^4 kcal. Express this quantity in BTU.
Physics Work,Power & Energy Level: Misc Level
What is I (Btu. hr-1 .in. F, ft-2) in Proper units (W.m-1. C-1)?
