Physics Electromagnetic Induction Level: High School
A solenoid has an inductance of 85.0 mH and a resistance of 0.300 ohm . Find the time constant for this current .
Physics Electromagnetic Induction Level: High School
A coil has a resistance R = 2.00 ohms and an inductance of 0.325 H . Determine the current in the coil if 120 V dc is applied to it .
Physics Alternating Current Level: High School
A transformer for a potable radio reduces 120 V ac to 9.0 V ac . The secondary coil contains 40 turns and the radio draws 350 ma . Calculate the current in the primary .
Physics Waves And Oscillations Level: High School
The highest note written for a singer in a published score was F-sharp above high C, 1480 kHz .a) Find the wavelength of this sound in air .
b) Transposed the note down to F above high C , 1397 kHz . By what increment did the wavelength change .
Physics Waves And Oscillations Level: High School
There is a evidence that elephants communicate via infrasound , generating rumbling vocalizations as low as 14 HZ that can travel up to 10 km . The intensity level of these sounds can reach 103 dB , measured a distance of 5.0 m from the source . Determince the intensity level of the infrasound 10 km from the source , assuming the sound energy radiates uniformly in all directions .
Physics Alternating Current Level: High School
A transformer for a potable radio reduces 120 V ac to 9.0 V ac . The secondary coil contains 40 turns and the radio draws 350 ma . Calculate the current in the primary .
Physics Magnetism,Magnetic Effects Of Current Level: High School
The two wires of a 2.5 m long appliance cord are 3.5 mm apart and carry a current of 7.0 A dc . Calculate the force one wire exerts on the other .
Physics Magnetism,Magnetic Effects Of Current Level: High School
A wire carrying a 25-A current has a length 1 = 13 cm between the pole faces of a magnet at an angle O = 60 degrees . The magnetic field is approximately uniform at 0.90 T . What is the magnitude of the force of the wire ?
Physics Electrostatics Level: High School
You have three capacitors , of capacitance 300 pF ,7000 pF ,and 0.001 uF .What maximum capacitance can you from these ?
Physics Magnetism,Magnetic Effects Of Current Level: High School
A circular coil of wire has a diameter of 20.0 cm and contains 12 loops . The current in each loop is 2.5 A and the coil is placed in a 1.8 T external magnetic field . Determine the maximum torque exerted on the coil by the field .
Physics Magnetism,Magnetic Effects Of Current Level: High School
A thin 11 cm long solenoid has a total of 400 turns of wire and carries a current of 2.0 A. Calculate the field inside near the center .
Physics Current Electricity Level: High School
Three 40 ohm light bulbs and three 70 ohm light bulbs are connected in series . What is the total resistance of the circuit ?
Physics Current Electricity Level: High School
Two 120 ohm resisters are connected in parallel to a 24.0 V battery . What is the equivalent resistance for the circuit ?
Physics Current Electricity Level: High School
Two 120 ohm resisters are connected in parallel to a 24.0 V battery . What is the equivalent resistance for the circuit ?
Physics Force & Laws Of Motion Level: High School
A box is hurled up the inclined plane of the above question starts up the plane with an initial velocity of 1000 cm/sec . Find the speed of the box moving up the plane 3 sec later .a) 0 cm/sec
b) -5.5 cm/sec
c) 8.9 cm/sec
d) 10.1 cm/sec
e) 42.4 cm/sec
f) 63.3 cm/sec
g) 75.3 cm/sec
h) 98.1 cm/sec
