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Physics

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Apr 3, 2024

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MIDTERM ANSWERS Under typical atmospheric conditions, there is an electric field near the earth's surface, directed downward, with a magnitude of 100 V/m Part A Part complete If we say that the potential at the earth's surface is 0 V V , what is the potential 1.3 km km above the surface? Express your answer with the appropriate units.V V =1.3×10 ^5 V Consider the wires shown in ( Figure 1 ). The upper wire carries the current I 1 = 20 A .What should the current I2 be in the lower wire such that the magnetic field at point P P is zero? Express your answer with the appropriate units. I2 = 40 A The three bulbs in (Figure 1) are identical. Rank the bulbs from brightest to dimmest. Rank the bulbs from brightest to dimmest. To rank items as equivalent, overlap them. A, BC, blank What is the magnitude of the electric field at the dot in the figure? (Figure 1) Express your answer in volts per meter. E= 1.0×10^4V/m What is the direction of the electric field at the dot in the figure? to the left

What is the time constant for the discharge of the capacitors in the figure (Figure 1)? Express your answer in milliseconds. τ =2.0 ms Draw a circuit diagram for the circuit of (Figure 1). —------------>

What is the equivalent resistance of group (a) of resistors shown in the figure? (Figure 1) Express your answer in ohms. Req = 11.0 Ω What is the equivalent resistance of group (b) of resistors shown in the figure? Express your answer in ohms. Req =9.0Ω ^^^ A scalloped hammerhead shark swims at a steady speed of 1.0 m/s with its 87-cm-wide head perpendicular to the earth's 58 μT magnetic field. What is the magnitude of the emf induced between the two sides of the shark's head? Express your answer in millivolts. E = 5.0×10^−2 mV What is the strength of the electric field 3.0 cm from a small glass bead that has been charged to + 7.0 nC ? Express your answer in newtons per coulomb. E =7.0×10^4 N/C What is the direction of the electric field 3.0 cm from a small glass bead that has been charged to 7.0 nC ? away from the bead As shown in (Figure 1), two protons are launched with the same speed from point 1 inside a parallel-plate capacitor. One proton moves along the path from 1 to 2, the other from 1 to 3. Points 2 and 3 are the same distance from the positive plate. Is ΔU1→2 , the change in potential energy along the path 1→2 , larger, smaller, or equal to ΔU1→3 ΔU1→2= ΔU1→3 Is the proton's speed v2 at point 2 larger than, smaller than, or equal to the proton's speed v3 at point 3? v2=v3

The current in an electric hair dryer is 14A. How much charge flows through the hair dryer in 4.0 min? Express your answer in coulombs. Q=3400C How many electrons flow through the hair dryer in 4.0 min ? Ne =2.1×10^22 A copper loop hangs from two strings, as shown in (Figure 1). In which direction (toward or away from the magnet) does the loop swing if the magnet is stationary? The loop doesn't move. In which direction (toward or away from the magnet) does the loop swing if the magnet is moving toward the loop? away from the magnet In which direction (toward or away from the magnet) does the loop swing if the magnet is moving away from the loop? toward the magnet The wires in (Figure 1) are all made of the same material; the length and radius of each wire is noted. Rank in order, from largest to smallest, the resistances R1to R5 of these wires. Rank from largest to smallest. To rank items as equivalent, overlap them. R4, R5 and R1, R3, R2

What is the equivalent capacitance of the three capacitors in the figure? (Figure 1) Express your answer in microfarads. C=8.9 μF A current loop in a motor has an area of 0.75 cm2. It carries a 240 mA current in a uniform field of 0.62 T. What is the magnitude of the maximum torque on the current loop? Express your answer with the appropriate units. τ = 1.1×10^−5 N ⋅ m QUIZ QUESTIONS: A person's heart rate is given in beats per minute. Part A: Is this a period or a frequency? frequency If you want to play a tune on wine glasses, you'll need to adjust the oscillation frequencies by adding water to the glasses. This changes the mass that oscillates (more water means more mass) but not the restoring force, which is determined by the stiffness of the glass itself. Part A: If you need to raise the frequency of a particular glass, should you add water or remove water? remove water In 1831, soldiers marched across the Broughton Bridge in England in "lock step"-that is, marching in time together. As they marched, the bridge began to bounce in time with their footsteps; the amplitude of this bouncing became larger and larger until the bridge suddenly collapsed

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