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Two long parallel wires carry currents of 20 A and 5.0 A inopposite directions. The wires are separated by 0.20 m.A. What is the magnetic field midway between the two wires?B. At what point between the two wires are the contributions fromthe two wires the same?
A skydiver jumps out of a plane and reaches her terminal speed of120 mph after falling for 15 s. How fast will the skydiver be going28.4 s later at the moment she pullsthe ripcord? (The parachute hasn't deployed yet)
In the hydrogen atom the radius of orbit B is 16 times greater than the radius of orbit A. What is the total energy of the electron in orbit B
One hundred turns of (insulated) copper wire are wrapped around a wooden cylindrical core of cross-sectional area 1.20 × 10?3 m2. how much charge flows through a point in the circuit during the change
Stars, to a good approximation, are spherical, and emit electromagnetic radiation from a surface of emissivity e = 1. What is the diameter (in millions of km) of this star
You want to construct a simple pendulum with a period of 2 seconds. what would be the new period of your pendulum
A bat (see the image below) can detect very small objects, such as an insect whose length is approximately equal to one wavelength of the sound the bat makes. what is the smallest insect the bat can detect
A sledge loaded with bricks has a total mass of 17.4 kg and is pulled at constant speed by a rope inclined at 21.0° above the horizontal. What is the tension in the rope
Suppose the tension in a cord is 14.0 N. If the speed of a wave in the cord is 8.50 m/s, then what must be the linear mass density of the cord
A swing is made from a rope that will tolerate a maximum tension of 8.0 102 N without breaking. What is the mass of the heaviest person
A kid picks up a toy of mass 139g, from the floor. The kid lifts the toy 42.2cm above the floor. How much work does the kid do on the toy
Two resistors (connected in series with each other) and a 18 Vbattery are connected in a loop. The voltage drop across the firstresistor is 7 V. What is the voltage drop across the secondresistor?
A school bus takes 0.89 h to reach the school from your house. If an average velocity of the bus is 21.1 km/h to the east, what is the displacement.
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