If the gravity force were to be suddenly turned off find the ultimate velocity v

Question

If the gravity force were to be suddenly turned off find the ultimate velocity v the particle will have. a) 4.26 m/s, b) 0 m/s, c) 2.58 m/s, d) 3.14 m/s Two parallel wires of length L are separated by a distance h. The Upper wire carries current I_1 tire left and the lower wire carries current I_2 to the right. Let L = 20.0 m, h = 0.007 m, I_1 = 5.00 A and I_2 = 8.00 A. Find the magnitude of the force F_1 on the Upper wire. a) 0.0229 N, b) 0.0267 N, c) 0.0320 N, d) 0.0400 N Find the directions (Up or down) on the (Upper, lower) wires. a) (up, up), b (down, down), c) (down. Up), d) (UP, down) Find the magnitude of the magnetic field midway between the wires. a) 0.00104 T, b) 0.00130 T, c) 0.00074 T, d) 0.00087 T A deep narrow hole of depth H is drilled into the earth. When wind blows across it the air whistles at its fundamental frequency f. The speed of sound in air is c_s = 343 m/s. Let H = 350 m. Find f. a) 0.492 Hz, b) 0.343 Hz, c) 0.286 Hz, d) 0.245 Hz A stone is dropped from the top of the hole. At a time t afterwards the sound is heard of the stone hitting the bottom. Find t. a) 9.47 s, b) 8.70 s, c) 7.87 s, d) 6.97 s

Explanation / Answer

Q20 requires data from question 19, so I am doing Q21.

21) F= uoi1*i2*L/2pi h

= 2e-7*5*8*20/0.007

= 0.0229 N

Option a

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